Jones & Lamson Machine Automatic Thread Grinders - Manual Grinder

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9

11

OPERATOR’S MANUAL

6 x 36 and 12 x 45 TONES & LAMSON AUTOMATIC THREAD GRINDERS

A Machine for Producing Accurate Threads at Minimum Cost

CONTENTS

Chapter One - SOME POINTS

Chapter Two - INSTALLATION and MAINTENANCE

Installation
Oiling

Maintenance

apter Three - ELECTRICAL OPERATIONS

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One-unit Control Panel - Motors and Accessories

s Incorporated in Control Panel

^r and Push Buttons in Station on Bed Front

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IjHiatic Machine Stop

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atom at ic Truing
'heel Motor - Coolant Motor

Wheel Motor - Dynamic Braking

Chapter Four - INSTRUCTIONS FOR THREAD GRINDING

General
Notes on Grinding Wheels

Storing Grinding Wheels

Balancing the Wheel
Mounting the Wheel
Diamonds

Dressing the Wheel (see Chapter Five)
Truing Device Selector
Work Speeds and Depths of Cut
Changing Diamonds
Backlash Compensator (Used in Two-way Grinding)
Pre-threaded work

Multiple Threads
Back Gears
.0001 Feed Screw
Setting-up for Taper
Cycle Chart of Set-ups

Work Speeds in Feet per Minute

• Table of Change Gears

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Chapter Five - THE J&L AUTOMATIC TRUING DEVICES

Chapter Six - RELIEVING - INTERRUPTING THREAD - & HOB GRINDING ATTACHMENT

Chapter Seven - THE INTERNAL GRINDING ATTACHMENT

APPENDIX - VALUABLE INFORMATION ON THREAD FORMS

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IMPORTANT

The problems of thread grinding are interrelated and wide in
scope. Therefore, a careful reading of this entire Manual is strongl^^H
ommended.

DO NOT START THE GRINDING WHEEL WITHOJ

K

WHEEL GUARDS IN PLACE, Tap all wheels with a block of wooq
mounting to make sure they are not cracked,

A cracked wheel w?l

ring - it will have a dull sound.

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which may arise.
quiries and suggestions our immediate attention.

We are anxious to help

Please do not hesitate to write us, as we give all in

(Manual for machine

you

with any thread grinding problems

.) This manual is for 5 x 30",



6 x 36" and 12 x 45" Jones & Lamson Automatic Thread Grinders.

JONES & LAMSON MACHINE COMPANY

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CHAPTER ONE

SOME POINTS

The Jones & Lamson Automatic Thread Grinders are the most universal machines on the
market. By universal is meant that they have more automatic feature^ and will handle a wider range
of work. It is possible to build such a machine because every J & L Thread Grinder has twenty
years of thread grinding experience built into it.

The satisfaction which this machine will give depends a great deal on the operator,

therefore, to our mutual advantage to make the operator acquainted with as many as possible of the

It is,

experiences of which we already have knowledge.

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problem of selecting the most satisfactory grinding wheel. At the present time vitrified bonded and

For instance, the large variety of materials on which threads must be ground present the

resinoid bonded wheels are employed. Each has peculiar advantages.

Vitrified wheels have a baked clay bond and are less flexible than resinoid bonded types.
Resinoid wheels have the ability to run at higher speeds, and will remove stock more rapidly. How
ever, because of their tendency to flex under cut, they cannot be recommended for correcting a pre

viously roughed thread which is off lead. The advantages of the stiffer vitrified wheel to correct off

lead threads are obvious. Resinoid wheels as a whole may be run at higher speeds than vitrified

wheels; although the

newer

vitrified wheels may be run at considerably higher speeds than formerly.




Higher wheel speeds are often an important factor in increasing production.

The relation of

speeds is given in Chapter IV as a guide. J & L Automatic Thread Grinders are provided with a
variety of positive work speeds. These speeds should be satisfactory for any work within the rated

grinding wheel

speeds to work speeds is especially important. A table of work

machine capacity.

The J & L method of controlling thread grinding wheel speeds is unique and original,
automatic wheel truing device is equipped with a scale which automatically records the wheel diame
ter. A chart plate on the wh-eel slide tells the surface speed of the grinding wheel in feet per minute
based on the wheel diameter and its r.p.m. as indicated by the position

of

the rheostat pointer. This

arrangement permits the operator to get the desired grinding wheel speed simply by turning the

The



rheostat dial to the position specified on the wheel speed chart.

The

matter of coolant is also very important.
great deal on the kind of coolant used. Although this item is subject to change, at this writing we
recommend White and Bagley’s XP-1572 grinding oil or its equivalent. It is important that this oil

be directed to the point of contact between the grinding wheel and work, so that the coolant will

Wheel life and finish of the work depend a

reach the point of the wheel. When the coolant is properly directed, very few sparks are visible.

Insufficient coolant at the point of contact between wheel and work will cause the wheel to

break down. With increasing wheel speeds the problem of keeping coolant directed to the point of

contact needs more attention. In some applications involving high wheel speeds, a nozzle of special

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design is used to direct the coolant under pressure to the point of contact. Such a special nozzle is
used because air currents, which envelope the rapidly rotating wheel, prevent the coolant from reach



ing the point of contact, if the usual flood coolant system is used.

When grinding threads of coarse pitch, the matter of coolant becomes more important.

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coolant,

Experience often shows that grinding wheels which appear at fault are not receiving enough

Before experimenting with high wheel speeds, it is well to consult the manufacturer of the

particular wheels.

Nicks in the wheel throw it out of balance and generally produce an unsatisfactory finish.

How to bring unbalanced grinding wheels into balance is explained in Chapter IV.

A little experience will enable the operator to tell by sound if the wheel is cutting correctly.

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A wheel that is cutting efficiently makes a distinctly different sound from one that is not. This
acquired ability to recognize a correctly cutting wheel, coupled with a little study and observation,
makes the problem of correct relationship between wheel speed and work speed a comparatively
easy one.

Whenever possible we furnish a demonstrator who is especially careful to point out this

difference to new operators.

In succeeding chapters will be shown the various operations required to grind threads.

.

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CHAPTER TWO

INSTALLATION AND MAINTENANCE

11

IMPORTANT: If a J & L demonstrator is to set up the thread grinder, it is strongly recom

mended that he be allowed to start the machine. However, no difficulty will be experienced in con
necting the machine for operation electrically and mechanically if the following instructions are


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followed carefully.

The machine, as shipped from the factory, is assembled completely except for the truing
device, coolant pump, coolant tank, coolant hose and nozzle. These are shipped in separate contain
ers. Great care must be exercised in handling the machine. Any sudden jar or heavy jolt is liable

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to damage the ways on which the slides operate. The machine should be at its place of installation



before the skids are removed.

As the machine is mounted on a three-point bearing, it is not necessary to work for exact
alignment.

The foundation should be free from vibration so that the finish of the work will not be
affected. It is not necessary to cement this machine into the floor as its weight will hold it in place
if there is no vibration.

Before the machine is started, remove cover 51872 (Drawing A-5426, at end of this chapter)

and pour a good grade of machine oil into the base of the machine. An oil gage in the lower part of

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the machine front indicates correct oil level. Replace cover 51872 before starting the machine. The
headstock, change gear housing, hob grinding attachment, and truing devices, except the pantograph
type, all have oil level gages. All units should be kept filled with oil to the indicated gage levels.
The bottom of the pantograph truing device housing should be kept filled with machine oil to a depth
of two inches.

Next, see that the oil cups 50969 (Drawing A-5078, at end of this chapter) on the wheel
spindle are filled with the highest grade spindle oil obtainable. The internal grinding attachment
also has two oil cups 50969 which should be filled as above. The bearings used in these spindles
are the finest obtainable. They should be given the best of care.

The

coolant tank should

now

be

rolled

into

place on the floor, on the right hand side of the ma
chine, beside the wheel head. Care should be taken to make sure that the coolant from the coolant
discharge will flow into the smaller of the three coolant tank compartments. The coolant hose may
now be attached to the coolant pump by the attached pipe union. Next, the stud of the coolant dis
tributor is slid into the coolant slide which is attached to the wheel head slide. This stud is then
clamped into place by means of the knurled screw on the top of the coolant slide. We ship one bar
rel of grinding oil with each machine. This should be poured into the coolant tank.

Main line electrical connections are made at the rear of the machine,

All other electrical
connections are permanently wired into the machine. The only exceptions are the truing device and
coolant motor. It is necessary merely to fasten the plugs of these units into their respective recep
tacles, after these units are in place. For wiring details refer to wiring diagrams supplied with the
machine. These diagrams are not included in this instruction book. They are shipped with the ma
chine for the convenience of the shop electrician and will be found in the control panel.

CAUTION: Before starting any motors, make sure that they rotate in the right direction as

indicated by arrows, and place dogs 52766 and 52755 as far apart as possible (Drawing A-5426 at end
of this chapter). Be sure that change gears are not put into the change gear housing until all motors
rotate correctly. Otherwise, certain units might be injured.

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Next, put the change gears into the change gear housing for the pitch of thread to be ground.

(See section on change gears in the chapter,

INSTRUCTIONS FOR THREAD GRINDING, for the num
ber of teeth, location and order of gears.) A compartment is provided in the rear of the machine
for storing change gears.



In assembling change gears, refer to A-5168 for 6 x 36, or A-5216 for 12 x 45. Remove the

knurled nuts on the end of the Change Gear Box and open the door. In most cases it will be

necessary

to loosen binding screw 51635, nut 8806 and stud 51567 in A-5168, or 52969 in A-5216 in order to

assemble the gears in place.

Spacer 51565 and then gear ‘A’ are slipped onto shaft 51558 in A-5168 or 52884 in A-5216.
Change gears are listed as A-B-C-D in INSTRUCTIONS FOR THREAD GRINDING. A = 1st driver,
B = 1st driven, C = 2nd driver, D = 2nd driven.

Bronze bushing 51616 is placed on the moveable change gear stud. Then gear ‘C’ and gear

‘B’ are slipped on stud.

Place spacer on lead screw shaft. Then gear ‘D’

. Now tighten binding screw 51635, nut 8806

and stud.

BE SURE TO PUT SPACER ON STUD IN FRONT OF GEAR ‘

B\ FASTEN CHANGE GEAR

BOX DOOR.

CAUTION:

Before inserting a Pantograph Truing Device be sure the diamond holders 51627
are in a vertical position (Section A-A, Drawing NX-628 of Operator’s Manual on J & L Automatic
Truing Devices). Otherwise one of the levers which hold the formers may be broken when this type

of truing device is inserted. The truing device motor should be used, if necessary, to bring holders
51627 into the desired position.

Next, take crank 20193 and rotate the truing device ratchet wheel counterclockwise as far as
possible. This ratchet wheel is just to the left of gear 54305 and controls the position of the truing
device in the wheel head slide drawing A-

5221. Now turn the wheel feed handwheel 50084 counter
clockwise until the wheel slide is as far to the rear as it will go. These precautions are taken so
that the truing device diamonds will not hit the grinding wheel when the truing device is placed in the
machine.

Insert the truing device into the rear of the wheel slide. It rolls easily into place on ball

bearings which act as guides. If it is a Pantograph or 60 degree type, the cloth bag attached to the

device contains two knurled nuts. The two spring studs projecting from the wheel head slide are

put into the two holes in the truing device end bracket and the two knurled nuts are screwed onto the

ends of these studs. These springs are then pulled into a position of tension by using crank 20193

on

the truing device lock studs, located one on each side of the wheel head slide. It is necessary to

keep these springs under tension when the machine is operated.



The procedure for inserting the Universal Truing Device is the same except that a stud and
steel ball are included in the bag containing the knurled nuts. This stud is put into the bronze bush
ing at the bottom of the Truing Device. Its beveled end is brought up against the steel roll. The
steel ball is inserted in the hollow end of the stud so that the ball acts as a bearing between this
stud and the end of the truing device lead screw.

A wheel of the proper grade and grain may now be selected for the job in mind. Protect this
wheel with paper washers and clamp it securely between the wheel flanges. This wheel adapter
should now be mounted on the wheel spindle and tightened in place with the washer and socket head

screw. In mounting the wheel, always keep the manufacturer’s marking toward the spindle nut and

washer used to hold the wheel flange to the spindle. If a wheel is turned

over

in changing, it may be

necessary to true a new form on the wheel.

Now insert the plug which is fastened to the truing device into the receptacle on the bed. All

electrical connections are now complete. The machine is ready for service.



MAINTENANCE

13

Very little is to be done with this machine in the way of maintenance. Keep all oil reservoirs
filled with good machine oil to the high levels. Oil cups 50969 should be kept filled with the highest
grade of spindle oil and set so that approximately one drop a minute will flow while the machine is
running. The machine should always be kept clean.

It is necessary to clean the coolant tank when the coolant becomes so filled with emery and

steel particles that a good

grinding finish is impossible. At all times the coolant tank should be kept
filled to as high a level as is practical, otherwise there may not be enough coolant to carry away the
heat of grinding.

All motor bearings need inspection and oiling at least every three months.

Pumps take care of all inaccessible lubrication points. A gear pump supplies splash lubrica
tion to all fast-moving shafts and bearings. All other places are oiled by a pressure lubrication
system.

The pump forces oil through drip plugs to the bearings.

The ways of the work slide are

pressure lubricated in this manner.

The life of any machine is directly proportional to the effectiveness of its lubrication sys

tem. Only the most modern and efficient oiling systems are used on J & L Machines.

ADJUSTING BRAKE





In

the

work motor flange a small opening will be found covered by a strip of sheet steel. This

should be removed. A locknut with holes all around the edge can now be seen. Under this locknut

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are four pins held against the locknut by springs. One of these four pins projects into a hole in the
locknut. If this pin is not visible, jog the workslide along until it can be seen. Push this pin in with
a screwdriver; turning the nut at the same time. Turn the nut towards the brake to tighten the
brake; away from the brake to loosen the brake.
the nut more than one hole before testing.

This adjustment is very sensitive. Do not move

After adjustment be sure one of the pins is in place in a

hole of the locknut.

ADJUSTING THE CLUTCH

Near the other end of shaft 52570 a similar locknut is used for adjusting the clutch; (See
Drawing A-5322 or A-5317.) This locknutis reached by removing a two-inch pipe plug in the back of

the machine. This too is a right-hand locknut. Turning it toward the brake tightens the clutch; away
loosens it. This adjustment also is very sensitive. Do not move the nut more than one hole before
testing.

)

CAM MOTOR BRAKE ADJUSTMENT - REFER TO PAGE 32

CAUTION:

Care must be taken not to break or bend any oil tubes. A single bent or broken

tube may reduce the pressure enough to render the particular lubrication system worthless.

Remove all grit and oil from the ways before moving the headstock or tailstock.

Do not nick grinding wheels. Even small nicks throw the wheel out of balance and affect the
quality of work produced. J & L grinding wheel adapters are supplied with balancing buttons so that
the grinding wheel may be balanced. This will be taken up in a later chapter.

Be sure the container for spindle oil is free from grit and dirt.

14

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ADJUSTMENT OF THE WHEEL SLIDE GIBS

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The gibs are

gib adjusting screws at the rear

adjusted carefully at the factory. If their adjustment becomes necessary, the

of the machine should be only turned small amounts at a time. For

adjusting these gibs we recommend the following procedure.

First remove the knurled steel cover on the right-hand side of the grinder bed. A shaft with

a hole through the end will be seen. Put a rod through this hole and turn the shaft to the left so that
the spring tension on the wheel head slide is removed. This makes it possible to move the wheel
head slide back and forth by hand when testing the gib adjustment.

Mount a tenth indicator near the rear of the right-hand side of the grinder bed, so that side-
wise motions of the rear of the wheel head slide can be detected. Mount another tenth indicator on
the bed so that sidewise motions of the wheel head front can be detected.

On the right-hand side of the bed are four screws about 4" from the top. These are turned to

’ the left just enough to be loose/ The actual gib adjusting screws are reached by removing the cover

on the gear box at the extreme rear of the machine. One of these adjusting screws is an Allen type.
The other is a square-headed. To tighten the gibs, the Allen screw is turned to the left, and the

square-headed one is turned to the right. Then tighten the other four screws which were loosened.
After this trial adjustment, determine if the wheel head slide can be moved smoothly back and forth
by hand. If this is possible, put a bar between the top of the bed and the wheel slide, near the rear

of the wheel head slide. If the gibs are properly adjusted, it should not be possible (even with the
bar) to move the wheel head slide sidewise more than .0005

” as shown on the tenth indicator at the
rear. Then test the front of the wheel head slide the same way by inserting the bar between the top
of the bed and the front of the wheel head slide. It should not be possible to move the wheel head

slide more than .0005" at this end either.

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Then apply the regular spring tension to the wheel head slide by allowing the shaft with the
hole through the end to return to its normal position; and start the machine so that it relieves auto
matically. If the wheel head slide is pulled back in place by spring tension after relieving, as should

be the case, it may be possible to tighten the gibs a little more, following the method just outlined.

Be sure that the four screws on the side of the bed, as well as the two rear adjusting screws are

tightly in place before considering this adjustment completed.

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CHAPTER THREE

ELECTRICAL OPERATIONS

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IMPORTANT: Any time a movement of the automatic machine stop limit switch 3 LS (See

CH-5053) is made with the truing selector switch in the Auto position, work rotation is preset for
automatic stop.

An incorrect sequence of operation may occur if the truing device is stopped before it com

pletes its cycle, in which case it may not be possible to start the machine.

Remedy: One or more of the following operations will make it possible to start the machine:

1. Turn the truing device selector switch to Auto.

2. Release the automatic machine stop limit switch 3 LS.

3. Press the Cycle Reset button on control panel.

4.

Release the manual work stop lever.

THE ONE-UNIT CONTROL PANEL

The one-unit control panel controls the following devices:

MARKING

11M
31M

31M
31A
31 FA
41M
110L

- 210L
310L

410L
510L
51M
4CR
3CR (Close)
3CR (Trip)
11CR

13CR
5CR
1GCR
2CR
ICR (Close)
ICR (Trip)

6CR (Close)
6CR (Trip)
Cycle Reset
Push Button

Work Motor Contactor

Wheel Motor Main Contactor
Wheel Motor Dynamic Braking Contactor
Wheel Motor Accelerating Contactor
Wheel Motor Field Relay
Truing Device Motor Contactor
Work Motor Overload Relay
Coolant Pump Overload Relay
Wheel Motor Overload Relay
Truing Device Overload Relay
Cam Drum Motor Overload Relay
Cam Drum Motor Contactor
Cam Drum Motor Relay

Automatic Stop Relay
Cycle Start Relay
Cam Drum Motor Relay
Cam Drum Motor Relay
Manual Truing Relay
Cam Drum Motor & Automatic Truing Relay
Automatic Truing & Wheel Motor Slow Down Relay
Cam Drum Motor Start Relay
Cam Drum Motor Stop Relay
Cam Drum Motor & Truing Device Relay
Cam Drum Motor & Truing Device Relay

See Remedy Above

Cam Drum Motor Sequence

DEVICE

Field Discharge Resistor - Thyrite Unit

Wheel Motor Starting Resistor, 3R1 - 3R2
Wheel Motor Dynamic Braking Resistor, 3R2 - 3R3
Control Fuses, 15 AMP.



Motors:

29

1

Wheel Motor - Work Motor - Cam Drum Motor with built-in brake - Coolant Pump Motor - Truing

Device Motor.

Accessories:
Rheostat - For wheel speed regulation.
Drum Type Reverse Switch - For wheel motor. (This switch is optional. It is used on machines

equipped to do internal grinding.)

Limit Switches:

1 LS - Work Slide Limit Switch, actuated by slide trip dog to cause cam drum to rotate.

2

LS

-

i

Truing Feed Limit Switch,

ing it also cuts out the cam

actuated by truing feed to start truing cycle. For two-way grind

drum motor, to allow the work spindle to pause for truing before



a 180° cam drum rotation is completed.
3 LS - Size Limit Switch, actuated by last wheel feed and presets for work spindle stop.
4

LS

-

Cam Drum Limit Switch, actuated by dog on cam drum wheel to stop work spindle, only af



ter engagement of 3 LS.

5

LS -

6

LS -

Truing Device Limit Switch - stops truing cycle.
Truing Device Limit Switch - speeds wheel at end of

actual wheel truing; and causes the

cam drum to complete 180° of rotation after the workslide is stopped for truing.

7

LS -

11

LS -

Work Slide Overtravel Limit Switch - stops machine. (Work and Cam Drum Motors.)
Cam Drum Limit Switch - stops cam drum after 180° rotation to reverse work slide.

SELECTORS INCORPORATED IN CONTROL PANEL

(1) Two position selector providing for:

A - One-way grinding
B - Two-way grinding

(2) Two position selector providing for:

A - Truing with slow down of wheel

B - Truing without slow down of wheel.

SELECTOR AND PUSH BUTTONS STATION

There is a three-position selector providing control of truing - MANUAL - OFF -

t

AUTOMATIC.

Start & Stop Push Button for the Wheel Motor and Coolant Motor.

Jog & Stop Push Button for Work Motor and Cam Drum Motor.

CAM DRUM

(See drawings at the end of this chapter)

When the work slide reaches the end of its travel, it engages limit switch 1 LS to pull in

contactor 51 M, thereby starting the cam drum motor.

30

When the cam drum rotates 180°, the following operations are produced in sequence:

(A) Throws work spindle clutch to neutral.

(B) Withdraws wheel. (On one-way grinding only.)

(C) Starts and feeds truing device - if required. If truing occurs, the cam drum stops

at this point for two-way grinding, until completion of truing.

ONE-WAY GRINDING - Work rotation must stop whenever truing is not completed
by the end of a short or fast return, as relay 6 CR in the cam drum motor control
circuit remains open until closed by operation of limit switch 6 LS. Work rotation
must restart automatically at the end of actual truing, but before completion of tru
ing device cycle.

TWO-WAY GRINDING - Work rotation must stop at all times for truing. Work rota
tion must restart automatically at the end of the truing, but before completion of
Truing Device cycle.

Automatic

truing is initiated by operation of limit switch 2 LS; see instructions for

truing.

(D) Feeds wheel.

(E) Throws work spindle and spindle clutch to reverse.

(F) Returns wheel. (One-way grinding.)





(G) Cam drum stops after 180° movement by engagement of limit switch 11 LS, which

energizes relay coil 11 CR, and opens cam drum motor control circuit at contact
11 CR.

AUTOMATIC MACHINE STOP

When

the wheel

is

fed for the final cut, the wheel feed mechanism actuates size control limit
switch 3 LS and presents for machine stop, after the final cut by operation of limit switch 4 LS at that
time. Limit switch 3 LS remains engaged during the final cut. Previous operations of limit switch
4LS have no effect. The work rotation will stop at either end of the work slide travel, depending upon
setting of the cam operating limit switch 4 LS. Limit switch 4 LS is engaged either at the 45 , 90°,
225°, or 270° position of the cam drum for one 180° movement of the cam drum. When limit switch

4 LS is set to operate at the 45° or 225° position, truing occurs before the finish cut. When 4 LS is
set to operate at the 90° or 270° position, truing occurs after the finish cut. Hence, automatic work
spindle stop is produced by operation of limit switch 3 LS and the next succeeding operation of limit
switch 4 LS.

After the automatic stop it is possible to take a sparking out stroke by merely pressing the

cycle start button.

.

TRUING

Truing is obtainable manually and automatically under control of a three point selector

switch - MANUAL - OFF - AUTOMATIC - included in the push button station.

With the selector switch set at MANUAL, operation of 2 LS will start the truing device and

slow the wheel. Manual truing is a continuous truing operation. It is only used when it is desired

to give the wheel an extra dressing; change the wheel form; or true out a new wheel.

The ‘

OFF' position has three functions:

31

1

Prevents starting the Truing Device either manually or automatically.

(A)

Permits stopping the Truing Device at any point for setting of diamonds.

(B)

(C)

Cuts out automatic machine stop.

Automatic truing may occur at any number of intermediate points in the grinding

cycle as determined by location of truing cams, latch on wheel feed mechanism and
actuating cams on drum. (See CH - 5057-A of Chapter Four.)

Automatic truing is initiated by operation of 2 LS.

ENGAGEMENT OF 2 LS

i

(A)

Starts the Truing Device which maintains itself until stopped by limit switch 5 LS

at the end of its return stroke.

Slows the wheel - optional under control of a selector switch on the control panel.

(B)

The wheel slows down by operation of relay 2 CR, which energizes the shunt coil of
relay 31 FA; the contact of relay 31 FA, short circuits the rheostat, thereby slowing
down the wheel motor.

(C)

The normally closed contact of limit switch 2 LS, when not engaged, is part of the

cam drum motor maintaining circuit.

When the diamonds actually leave the wheel, the Truing Device trips limit switch
6 LS, which has one function for one-way grinding and two functions for two-way
grinding.

For one-way grinding limit switch 6 LS merely speeds the wheel, except

on an extremely short or fast work slide stroke; in which case the slide automati



cally stops until truing is completed before another grinding stroke is started.

For two-way grinding, except as later noted, limit switch 6 LS speeds the wheel and
starts the cam drum motor to complete the 180° cam drum rotation.

AUTOMATIC TRUING

Automatic truing may occur under three sets of circumstances when the selector switch is

set on ‘

AUTOMATIC’.

(A) One-way grinding with intermediate truing:

Under these conditions truing occurs

during the return or idle stroke of the work slide. The cam drum will not stop for

i

truing but instead completes 180° of rotation. If truing is not completed before the
work slide reaches the other

end

of

travel, limit switch 6 LS is interlocked with limit

switch 1 LS to prevent a complete 180° movement of the cam drum until both limit

i

switch 6 LS and limit switch 1 LS have operated.

(B) Two-way grinding with intermediate truing: Under this condition the cam drum motor

is stopped at a neutral position to await completion of actual truing. When limit
switch 6 LS operates, the wheel is speeded and the cam drum motor restarts to ro



tate the cam drum for the remainder of its 180° movement.

(C) Two-way grinding without intermediate truing, but with final truing after the last cut:

Under these conditions automatic cam drum stop is obtained as described above after
the final cut. At this point by suitable cam setting, truing is initiated and carried to
completion the usual way. Limit switch 6 LS speeds the wheel, and restarts the cam
drum motor to complete the remainder of its 180° movement.

32

WHEEL MOTOR - COOLANT MOTOR

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Pressing the wheel motor start push button starts the wheel motor and coolant pump motor;
energizes the closing coil of main contactor 31 M; and the shunt coil of field relay 31 FA. When
contactor 31 M closes, it connects the wheel motor armature to the line through the starting resis
tance 3R1 -- 3R2, relay 310L, and series coil 31 FA. Contactor 31M also provides a maintaining
circuit for its own coil, by closing an auxiliary interlock to by-pass the start button.

The

field rheostat is short circuited during the starting period by contact of relay 31 FA. The
shunt field is connected directly across the line either through the rheostat or contact or relay 31 FA.
The accelerating contactor 31A has its closing coil connected across the motor armature. Coil 31A
is designed to close the contactor at approximately seventy-five percent normal voltage. Contactor
31A in closing cuts

coil causes relay 31 FA to vibrate alternately cutting the field resistor in and out of the circuit, as
the motor speed increases. When the motor reaches the speed for which the rheostat is set, contact
31 FA remains open.

out the starting resistance 3R1-3R2. The armature current through 31 FA series



WHEEL MOTOR - DYNAMIC BRAKING

Pressing the wheel motor stop button drops out main contactor 31M allowing its lower con

tact (normally closed) to close and complete a circuit through dynamic braking contactor coil 31M

(HC). The armature now disconnected from the line generates a counter-voltage. This counter
voltage passes through coil 31M (HC). When 31M lower contact closes, it connects resistance 3R2-
3R3 across the armature causing the power being generated in the armature to be dissipated as heat
in this resistance. The shunt field remains energized during the stopping period so the motor may

generate voltage.





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CAM MOTOR BRAKE

The cam motor brake is built into the cam motor. Should reciprocating motions of the work-

slide and wheel head occur, these indicate that the cam motor brake requires adjustment. When

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adjusting this brake, refer to picture CH-5054-C. Make sure that the brake is so adjusted that the
roll on limit switch 11 LS stops in the center of its cam stop limit switch dog when the dog plate
comes to rest.

Easy adjustment
This adjustment is by means of a multiple thread screw of larger diameter and a mating nut, The
shank of the screw extends through the brake cover and to this is clamped a lever. There is an ad

justing screw in the end of the lever, by means of which it is possible to secure an extremely fine
adjustment. After all of the adjustment provided by this screw has been utilized, it can be backed

up,

the

clamp

ment can again be obtained by the small screw in the end of the lever.

the brake armature. This compresses the coil springs and the pressure on the brake discs is re
leased. The magnets hold the coil springs under compression as long as current is flowing through

the motor, and as there is no friction on the brake discs, the rotor of the motor revolves freely.

ful pressure springs are released, forcing the pressure plate against the friction discs, bringing the

motor to a quick stop.

loosened, and the lever reset. The clamp should then be tightened and the fine adjust

Operation: When the motor is started, the brake magnets are energized, thus pulling back

The

instant the line switch is opened to stop the motor, the magnets are de-energized. Power

: The cam

drum brake is easily adjustable without removing the brake cover.









The gap between the brake pole pieces and the brake armature should be .030" to .050"

33

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CH Electrical Control Panel. For 6 x 36 Thread Grinding Machines 110101 to

110170 inclusive. Except 110106 and 110107.

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35

CHAPTER FOUR

INSTRUCTIONS FOR THREAD GRINDING

GENERAL

J & L Automatic Thread Grinders -

Capacity - Maximum thread diameter

Maximum thread length
Maximum work diameter
Maximum work length
12 x 45

M Machine will grind 18"

anywhere on work 33" long

6 x 36" Machine will grind 12" of thread

anywhere on work 24" long

Hole through work spindle

6x36"

of thread

6-1/2"

12"

7-1/2 "

36"

1-11/16"

12 x 45"

12"

18"
21"
45"

2-3/8 "

J & L Thread Grinders are fully automatic except for placing the work between centers and
backing out the wheel after the final cut. All feeds, wheel dressing and sizing operations are fully
automatic. The various automatic functions of the machine are largely under electrical control.

The control equipment is the best obtainable and is housed in the left rear side of the machine. We
ship with each machine a complete set of wiring diagrams and all necessary information. If an
emergency arises, the local service department of the manufacturer of the control equipment can be
reached.

On the left front of the machine will be found three switch plates. While picture CH-5053

gives a description of the uses, a little explanation is needed to explain the need for a cycle start
button. On this machine the work motor runs continuously during operation. Start this motor by
pressing button on upper right. To start the machine after each grinding cycle has been completed,
it is necessary to press the upper center button, known as the cycle start. This button starts the

machine off in its new cycle, whether for one-way or two-way grinding.

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position for the next piece. If the operator neglects to do this before pressing the button, the motor
will not start; also, there will be a telegraphic sound from the control panel, This signal indicates
we are trying to. start the machine when it is set for automatic stop.

manual work stop lever (with red ball handle) to the right. (See CH-5053) This draws the drive

!

clutch out of engagement and stops the work rotation. Forward and reverse movements of the work

are accomplished by proper setting of the automatic reverse dogs/ however, reversals between dogs

Before the machine can be started, the wheel must be backed out manually to the starting

If it is necessary to stop the rotation of the work at any time between reversals, throw the

can be made by manual operation of the table reverse lever at the right hand side of the bed,

The ratchet wheel on the left, under the large front cover is on the truing feed shaft. The

ratchet wheel on the right has a-handwheel and controls the wheel feed shaft.

NOTES ON GRINDING WHEELS

The amount
depends largely on the kind of wheel used, and the speeds at which the wheel and work are run. Wheel
developments are being made so rapidly that we cannot give exact wheel specifications for different

types of work. However, we strongly recommend that the operator get in touch with the local rep
resentative of the Norton Company, Worcester, Mass., U.S.A. or of the Carborundum Company,

Niagara Falls, U.S.A.

wheel developments.

of

work which this J & L Thread Grinder will turn out and the quality of its finish

, and ask these representatives to keep them posted on latest thread grinding

At

the present time these companies are the principal manufacturers of thread



grinding wheels.

Although some

rules

on

thread grinding wheels follow, the operator must use his judgment in
picking out the right wheel. Even after having experience he may not be able to pick out the best
wheel for the job the first time.

37

With each machine we ship two grinding wheels. These wheels are selected as being satis



factory for the work on which we understand the J & L Automatic Thread Grinder is to be used.

Some general rules about thread grinding wheels:

Use the coarsest grained wheel which is practical. As a rule, the finer the pitch, the

(1)

finer grained wheel necessary. Too coarse a wheel does not give the best finish. If the
wheel is too coarse for the pitch of thread being ground, it is difficult to dress and keep
a perfect form on the wheel point.

\

Use the highest wheel speed practical, but DO NOT EXCEED the wheel speeds recom

(2)

mended by the wheel manufacturer as there is danger of wheel breakage in so doing. At
present most vitrified wheels are not made to run faster than 7500 surface feet per min
ute. The safe limit of resinoid wheels is usually set at 9500 surface feet per minute.
These safe speed limits are subject to change at any time. Moreover, the Safety Code

for the use,

care

and protection of abrasive wheels, approved by tue American Standards

Association, states that the surface feet per minute of wheels may exceed Safety Code





maximum limits upon the distinct recommendations of the wheel manufacturer.

(3)

As a general rule resinoid wheels can be run at higher speeds and will take heavier cuts

than will vitrified wheels. Resinoid wheels are generally used for production work. Vit

rified wheels are used for grinding extremely accurate work such as lead screws, gages,



etc.

(4)

Resinoid wheels are not recommended for grinding pre-threaded work which may be off

lead as they are apt to flex and not correct the error. Vitrified wheels on the other hand

are

much

(5)

Too heavy a cut will cause the wheel form of either resinoid or vitrified wheels to break

stiffer and have less tendency to flex, even if pre-threaded work has an off lead.

down.

(6)

Extremely accurate work requires lighter cuts, and hence more cuts.

(7)

Although the material and hardness of the work being ground is a factor in choosing the

wheel to be used, it is also important to select the most suitable combination of work and

wheel speeds.

(8)

Excessive wheel truing causes needless wheel wear and dulling of diamonds.

(9)

Take heavier roughing cuts, lighter finishing cuts for production and accuracy.

2

(10)

Slender pieces may require more cuts to eliminate springing.

(11)

Work speeds range from 2 to 15 surface feet per minute, depending upon the material,

hardness,

and

the grade and grain of the wheel. At the time of this writing most external

work is ground at surface speeds between 2 and 5 surface feet per minute. At higher
work speeds it is necessary to take lighter cuts in order to avoid excessive wheel break

down and burning of the work. With experience the operator will soon learn to determine



the most satisfactory work speed for any given type of work.

(12)

A wheel that is too soft will wear away faster than necessary.

STORING GRINDING WHEELS

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Every precaution should be taken not to nick wheels. After a wheel has been used it should
not be stored in a vertical position because the coolant drains to the bottom. This throws the wheel
out of balance. Thread grinding wheels should be stored in a horizontal position.

BALANCING THE WHEEL

With all of our wheel adapters we supply balancing buttons for balancing and improving the
grinding action of the wheel. We suggest that at least one J & L Wheel Balancing Stand, A
balancing arbor be available in any plant where thread grinding is done. It is impossible for the

manufacturer to produce a wheel which is in perfect static balance, but by the correct adjustment of
the balancing buttons which are placed in the dovetail groove near the outside diameter of the wheel
flange,

nicks in it, will cause chatter.

are perfectly level. Then place the arbor on which the wheel is mounted on the stand. If the wheel
is not in perfect balance, the wheel will rotate slowly, back and forth, and come to rest with its
light part at the top. Mark this light point. 'At that point insert one or two balancing buttons in the

wheel flange groove. The number of buttons used depends on how much the wheel is out of balance,

I

The buttons should be adjusted until the wheel is in perfect balance.

the

wheel can be balanced to produce much better finishes. An unbalanced wheel, or one with

To use this balancing stand, first be sure that the two surfaces on which the wheel

PUTTING ON THE WHEEL

-5116, and

arbor rolls

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-

Directions for assembling the wheel and its flange onto the spindle are given in Chapter Two,
Great care should be taken not to nick the wheel, when the wheel is slipped onto the wheel spindle,
Also take care not to hit the Truing Device diamonds with the wheel. Putting some waste in the wheel
head slide, directly under the portion of the spindle onto which the wheel flange is mounted will some

* I

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■

11

1

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times prevent nicking the wheel in case it should slip.

DIAMONDS

If the grinding wheel is to cut efficiently, the diamonds must be sharp. Always use coolant

on the wheel when truing. Truing cuts which are too heavy dull diamonds needlessly, therefore do
not take off more than is necessary to maintain correct form. Back the Truing Device away from
the wheel before removing it. This is done by turning the truing feed shaft counterclockwise.

Hard wheels dull diamonds quicker than soft wheels, whether resinoid or vitrified. Dull dia

monds may cause a poor finish on the work. In extreme cases they may also deflect the grinding

wheel, causing a change in form.

When they become dull, unformed diamonds such as are used in the Universal Truing Device
may be rotated in their holders, In case form diamonds become dull, it is necessary to replace
them with new ones, or some which have been relapped.

DRESSING THE WHEEL

(See Operator’s Manual on J & L Truing Devices)

The type of Truing Device used in getting any particular thread form can best be determined

by studying the catalog or Operator’s Manual on J & L Automatic Truing Devices.





In dressing a new wheel, or in changing the form on an old one, watch carefully to see just
when the wheel is correctly formed to save needless dressing. When it is necessary to remove large
amounts from the wheel, as with Whitworth forms, or fine pitch 60° forms, a J & L Hand Dressing
Attachment should be used. In this way much diamond wear is avoided. The final dressing is then
done in the usual way with the Automatic Truing Device.

39

1

Move the Truing Device Selector switch to manual. This switch is the lower center one in
the selector switch panel on the front of the bed. Watch the travel of the diamonds until they have
moved to a point which should bring them about halfway down the sides of the wheel. At this point
the Truing Device switch is turned to ‘

OFF’.

Start the wheel spindle into operation and gradually advance the Truing Device by means of
the Truing Device feed shaft until the diamonds are heard to contact the wheel. Throw the Truing

■i

fact that the wear on the diamonds may have occurred unequally, it will probably be necessary to

Device switch to ‘

MANUAL/ and allow the diamonds to complete their cycle of operation. Due to the

take one or two truing cuts across the wheel with the diamonds after they are set with the gage.
When the wheel is fully dressed out, return the selector switch to ‘

AUTOMATIC

’ position. It will

be necessary to set the machine for size, which will be covered later in this chapter.

IMPORTANT
to cut off more than enough to bring the wheel to correct form. The amount the wheel is trued each
time when the selector switch is set on ‘
on the truing adjustment lever. Each tooth on the ratchet wheel equals .0003 on the diameter of the

: Care should be taken in dressing to make sure the diamonds are not required

AUTOMATIC

’ is indicated by the scale numbered 0-1-2

grinding v/heel.

THE TRUING DEVICE SELECTOR

The Truing Device Selector is left in the ‘
on production. This setting insures the operation of the truing device at such times as may be pre

AUTOMATIC

’ position at all times when grinding



determined by the operator.

When the Truing Device Selector switch is turned to the ‘

OFF

’ position, no truing action

takes place regardless of the position of latch 50478 relative to its actuating cam.

This ‘
machine stop limit switch. This is particularly useful when making a machine setup as it is custom
ary to work with the stop latch 52036 engaging the stop dog 51916 (See Drawing A-5426). When the

selector switch is set in the manual position, the truing device operates continuously. This manual
setting is used for dressing large amounts from the wheel as, for instance, when a new wheel is

OFF

’ position of the switch also serves a second purpose by cutting out the automatic



placed in service or to repair a wheel profile broken down by too heavy a cut.

*.

When a thread grinding job has been selected, one must know the outside diameter, pitch

diameter, number of threads per inch, the form of thread, helix angle, the length of thread, and
whether the thread is straight or taper, or, as in the case of taps, whether they have a slight amount
of back taper, amount of relief, if any, etc. When these facts are known, we are ready to set-up.

SETTING UP INSTRUCTIONS

(Useful information on pitch diameters and helix angles is found in Chapter Five.)

Correct change gears are selected and installed in the change gear housing at the left hand

end of the work slide.

(See Chapter Two for instructions on assembling change gears.) The wheel
feed hand wheel is then turned counterclockwise so that the grinding wheel is moved far enough to
the rear to clear the work.

When changing the position of the headstock or tailstock, be sure to wipe the ways clean of

grease and grit before moving these units.

The position of reverse dogs 51869 and 51870 on the front of the slide determines the length

of the grinding stroke.

■

,t'i

i :

:

It:!

We make a distinction between ‘

one-way

’ and ‘

two-way

’ grinding.

One-way Grinding: The wheel makes a pass across the work. It is withdrawn at the end of

the cut through the action of wheel withdrawal cam and the work is returned to the starting position

(See A-5126-A, Chapter Three). On this return stroke, higher work speeds may be used. When the
wheel returns to the starting point, the cam moves the slide forward bringing the wheel in, ready
for the next cut.

Two-way Grinding: In two-way grinding the wheel is not backed away from the work on the

return cut. It grinds in both directions.

On most production thread grinding we recommend two-way grinding. Where the utmost in

lead accuracy is required, we recommend one-way grinding. While the difference in the quality of

thread produced by these two methods is very slight, under certain conditions small inaccuracies
may appear in two-way grinding, which are not present in one-way grinding.

To make

clear the necessary operations for various types of grinding, both one and two-way,

we provide a chart, CH-5057-A, (near the end of this chapter) which shows clearly the settings ne

cessary to grind according to the desired set-up as shown in the first column, under title of ‘

SET

UP’.

The second column gives the location of the dogs on the cam drum. This cam drum is located

on the end of the cam drum shaft in the lower right hand end of the bed. These changes can be made

by removing the cover which houses the limit switches operated by these dogs.





!

£

I

If

The third column shows the location of the dogs on the feed gear. The correct placing of

the stop and truing actuating cam on the feed gear, together with the right amount of feed, insures

the results called for in the set-up.

The fourth column shows the direction of travel of the slide on the final cut before automatic

stop.

i

The fifth column shows the location of the truing feed dogs. These are found on the lower

left hand front of the machine under the front cover.

The

sixth column shows the location of the relieving pin in the cam box. This relieving pin

merely serves as the actuating member for relieving the wheel on the return stroke. This reliev

:

ing pin is on arm 53320. (See A-5126 in Chapter Three.)

IMPORTANT: On machines in the field, three different arrangements are to be found on the



top of arm 53320, for changing from one-way to two-way grinding.

i

i

One arrangement is shown in column six of CH-5057-A. A lever on top of arm 53320 is pulled

out of the slot for two-way grinding.

Another arrangement calls for a 1/2" pin and a 1

the 1/2"

pin. These are all three removed for two-way grinding. SINCE THE ROLL IS LOOSE ON

THE END OF THE PIN, CARE MUST BE USED IN REMOVING THESE UNITS; OTHERWISE THE

” steel roll which turns freely on the end of

ROLL MAY DROP DOWN INTO THE BOTTOM OF THE CAM DRUM HOUSING.

In the third arrangement a set screw is loosened in the top of arm 53320, so the pin may be

pulled out for two-way grinding.

1

41

One other setting must be made. That is the proper positioning of the selector switch on the

lower left hand side of the electrical control panel, for the setting of One or Two-way grinding.

The pitch diameter and the number of threads per inch determine the helix or lead angle of

the thread to be ground. Helix angle adjustments are made by first loosening the clamp ring which
holds the wheel head casting onto the wheel slide: then turning the worm shaft which rotates the
wheel head casting in its cradle. The required amount of helix can be read directly on the helix

angle scale mounted conveniently on the wheel slide. If a taper thread is to be ground, a former
giving the required taper is bolted to the front of the slide directly over the front cover. The lever
carrying a follower will move the wheel slide, bearing the wheel, in and out the required amount as

the work passes the wheel.

In order to correct any small taper condition which may be present in grinding a straight

thread, a ‘

Slight Taper Adjustment

’ is provided on the tailstock.

When the wheel has been advanced within reasonable distance of the work, it is well to re
lease the stop latch and allow the feed gear to come to a dead stop. After this point has been reached,
it will be impossible to advance the wheel feed any further by turning the hand wheel.

Next, loosen the

two clamp screws on the front of the plate, which act as a clamp between the
gear operated by the wheel feed hand wheel and the wheel feed nut. On the front of this wheel feed
nut is a square end shaft 52563 which takes the same crank 20193 used in moving the headstock and
tailstock. The advance of the grinding wheel has now been transferred from the hand wheel to the
hand crank. All feeds are now made through this crank. This particular operation is only used for
making a set-up on the first piece. With the work revolving, the wheel should be carefully advanced
until it engages the work. Once size has been reached this plate is again clamped in place and ex
cept for wear on the diamonds, it should not be necessary to make any further change in size. Work
speeds range all the

way from two feet to fifteen feet per minute, depending on the material, the hard

ness, and grade and grain of the wheel.







At this setting of the wheel feed hand wheel, the cam 51918, which controls diamond truing
is brought into position to allow dressing the wheel. It is not necessary to dress at each pass dur
ing the set-up, so the latch 50478 which is directly underneath the truing actuating cam should be
thrown forward, which makes this particular mechanism inoperative until such time as it is needed,



or the truing selector switch can be changed to the off position.

\

The scale of the feed gear is graduated in thousandths of an inch English measurements, and
hundredths of a millimeter in the case of metric machines. These measurements represent diameter
readings. It is thus very easy to advance the wheel to any desired depth on the thread. All subse
quent movements

of

the grinding wheel are taken care of in the normal manner, that is, by the wheel



feed hand wheel 50084.

The wheel is fed in desired amounts automatically, by setting the wheel feed dog. This wheel
feed dog has a scale and is located on the front of the bed. A finer finishing grind can be had by ar



ranging the amount of the roughing cuts so the feed gear stop allows a lighter finishing cut.

WORK SPEEDS AND DEPTHS OF CUTS

In thread grinding, as in other machining operations, the depth of cut that may be taken de



pends on the many details surrounding each particular job. For roughing cuts, .035" to as much as

42

.090"may be taken from the diameter of the work. The depth of the cut naturally has a bearing on
the work speed. Generally, the work speed is reduced as the depth of cut is increased.

On finishing cuts, the diameter

of

the work is generally reduced from . 0002"

to

.005”, depend

ing on the finish required and other factors on which it is quite impossible to give definite instruc
tions. A little experience will put the operator in position to determine the suitable work speeds
and wheel speeds, as well as the depth of cut.

CHANGING DIAMONDS

When changing diamonds in the truing device, it is necessary to back the Truing Device to
ward the rear one or two revolutions of the Truing Device feed screw. (See also Operator’s Manual
on

J & L

Automatic Truing Devices.) This is done so the diamonds will not strike the grinding
wheel when the Truing Device is put back. Crank 20193 is placed on the squared end of the truing
feed shaft. Turn the truing shaft counter-clockwise to turn the Truing Device back. The Truing

Device is then withdrawn from the wheel head casting, and the diamonds are removed by loosening

their clamping screws. New diamonds are put in place as per the instructions given in the Opera
tor’s Manual on J & L Automatic Truing Devices. Return the Truing Device to the wheel head cast
ing and clamp it in place. Then follow directions given under DRESSING THE WHEEL.

CHANGING WHEELS

In changing wheels the procedure is much the same as described for changing diamonds,
except it is not necessary to take the Truing Device out of the wheel head slide. However, the Tru
ing Device must be turned back to the extreme rear position to make room for the new wheel. (If
this is not done, the new wheel will hit the diamonds and may injure them making their replacement

or re-setting necessary.) After a new wheel is on the spindle, proceed when truing as before, that

is, stop the diamonds part way in their travel across the wheel, before advancing the Truing Device
until contact is made between the diamonds and the wheel. Take a sufficient number of truing cuts
to assure the desired wheel form.











As a general rule, dress the wheel as seldom as possible, and have the truing cuts as light

as possible, still maintaining the accuracy of the threads produced within acceptable tolerances.

The amount of truing needed on a wheel is determined by many factors such as the hardness

of the material, the length of the thread, the depth of the thread, the pitch, and the work and wheel
speeds. The plate 52728 (see A-5221) indicates the amount removed from the wheel at the particu
lar setting. Ordinarily only one dressing per piece is necessary; should the threads be very long,
it may be necessary to dress the wheel more than once. In that case, another trumg cam is placed

on

the wheel feed gear so the wheel can be dressed as required.

When the work is finished, it is only necessary to withdraw the wheel until latch 50478 con

tacts the cam which acts as a stop. This places the wheel in the right position for the first cut on
the next piece, after which the grinding operations are taken care of automatically, the dressing oc
curring at the predetermined time.

BACKLASH COMPENSATOR

two-way grinding, it is essential that the reversal of the work be accomplished without

In

side feeding of the work in relation to the grinding wheel. Since it is impossible to entirely eliminate

backlash between the work spindle and the lead screw nut, a backlash compensator has been provided

in the headstock. This is reached by removing the cover farthest from the spindle nose. The oper

ation is as follows:









First grind the thread from the tailstock toward the headstock as usual. At the end of the
cut and before reversal, back out the wheel by hand. Advance the wheel gradually during the return
cut until contact is made with the work. This contact will come somewhere on one flank of a thread
due to backlash. In other words, it will not be centered exactly with the previous cut. Refer to
Drawing A-5143 of Chapter Two; see section through compensating ring. Screw 8529 which clamps
the ring in place on the spindle is loosened. Then, turn worm 51953, in order to increase the space
between dog 51955 and pin 51950 on the clamp ring. No set rule can be given for the position of this
dog and pin because the amount of backlash is never the same for any two given setups. Listening
for the correct sound; and using machinists

’ blue aid in bringing the wheel to its proper position
where the wheel hits on both blanks at the same time. A little experience teaches the operator how
much adjustment is needed to compensate for any given thread. As a general rule; more compensa
tion is required for finer pitch threads. After the backlash compensator is set correctly; tighten
screw 8529. With the backlash compensator set correctly, there is no need for further adjustment
until a new setup is made.

PRE-THREADED WORK

43

1



For matching threads on pre-threaded work in lots of more than one piece, the J & L Bench

Matching Device

is

used.

Locate the

first piece between centers of the Bench Matching Device. Then

rotate the piece in its dog until the dial indicator reads zero. Clamp the dog in place. Then mount

the piece in

the

machine and match its threads to the grinding wheel, using the J & L Built-in Machine
Thread Matching Device. After the first piece of a lot is properly matched, it is no longer neces
sary to use the Built-in Machine Thread Matching Device. Merely locate each piece in the Bench
Matching Device as above described.

(See drawing A-5033 at the end of this Chapter.) Note: Dif

ferent pointers are used in the Bench Matching Device. Each pointer is marked with the thread pitches





for which it is used.

MULTIPLE

Each graduation on the flanged end of the headstock spindle bears numbers running 2, 3, 4,

and 6. These graduations are divisions of one complete spindle revolution. In grinding a double

thread, 10 pitch for example, change gears for a thread of twice the size (5 pitch) are put in the change
gear housing. The
The

headstock spindle is jogged around with the manual work stop until the headstock casting pointer

coincides with a line

first

10 pitch thread is ground to size and the work returned to the starting point.

on the spindle marked i

2\ Next throw out lever G- 8219 on the front of the head

stock casting. This disengages a very accurate gear tooth clutch in the headstock drive and leaves

the spindle free to rotate. The
to the pointer.

Lever G-8219 is now returned to the original position. The second thread is then

operator turns the spindle by hand until the next line marked s

ground to size as was the first, thereby completing the job for a double thread. The procedure is

identical for triples, quadruples or sextuples, it being only necessary to use suitable change gears
and to move from one figure to the next corresponding figure according to the number of starts on

»

the thread to be ground.

THREADS

2' comes

.0001 FEED SCREW

The accurate .0001 graduated feed screw at the top of the wheel relieving lever is used for
work where closer tolerances are needed than can be read on the feed gear which is graduated in
thousandths.

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TONES

AND

LAMSON

STANDARD GRINDING WHEELS

FOR

JONES & LAMSON THREAD GRINDERS

WHEEL

NUMBER

51164
51234

53896

53895
54104

54107
54108

CO-7101-7

CO-71Q2-5

TYPE

1-‘E

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1

WORK SURFACE SPEED TABLE

R. P. M. of work spindle

12

0.8
.0

1.2

1.4

1.6

2.0

2.4

2.8

3.1

3.9

4.3
4 .7

5.1

5.5

5.9

6.3

G

. 7

7.1

7.5

7.9

6.3

6. G

9.0

9.4 10.2

9.7

10.2

10.6

11.0

11.4

11.6

12.

12.

G

13.3

14.1

15.0

15.7

16.5

17.3

18. 1

13 | 15

0.9

1.1

1.3

1.7

2.1

2.3

2.G

3.0

3.4

3.8

4.2

4.7

5.1

5.5

G.O

6.4

7.2

7.7

8.1

8.5

8.9

9.4

9.8

10.7
11 .2

11.5

11.9

12.3

12.7

13."

13.7

14 .5

15.3
1G.3

17. 1

17.9

18.7

(Without back gears)

16

1.0

1 . I

1.3

1.2

1.0

1.5

1.8

1.7

2.0

2.1

2.5

2.6

3.0

3.1

3.7

3.4

4.2

3.9

4.7

4 .4

5.2

4.8

5.4

5.8

6.3

5.6

G.3

G. 6

7.3

0.8

7.3

7.9

8.4

7.8

8.3

8.9

8.8

9.5

10.0

9.3

10.5

9.8

11.0

10.3

11.5

10.8

12. 1

11.3

12.6

11.7

12.2

13.1

12.7

13.7

13.2

14.2

14.7

13.7

15.2

14.2

15.7

14.7

16. 3

15.2
16*8

15.7

17.8

16.8

17.7

18.9

16.7

Work

dia



meter

.3750
.4375

1

1.125

1.250

1.375

i

I

1.500

1.750

1.875

2.000

2.125

2.250

2.375

2.500

2.625

2.750

2.875

3.000

3.125

3.250

3.375

3.500

3 .625

3.750

3.875

4 .

4.
4 .500

4.

5.000

10.00

11.00

12. OU

. 250

3125

.500
.625
.750
.875

.non

.625

5.25

5.50

5.75
G.00

7.00

8.00

9.00

000

250!

750

1.8

0.6 1.2

0.0 1.3

0.0 1.4

1.0 1.5

1.1 l.G

1.1 1.7

1.2 1.8

1.2

1.3 1.0

1.4

1.4

1.5

-G
.7

1.7

1.8 2.7

1.8 2.7

1.9 2.8

2.0 3.0

2.1 3.2

2.3

2.4

2.5

2.6 3.9

2.7

2.8

3.3 4.9

3.6 5.7

4.3 G.4

4.7 7.1

5.2 7.8

5.7 8.5

2.7 [ 2. tl

0. 8

0.9

0.9

1.0

1 .0

1.1

1.1

1.2

.1

1.3

1.4

1.5

l.G

1.7

1.8 2.5

1.9 2.6

2.0 2.8

1.9

2.1 2.9

2.2 3.0

2.0

2.3 3.1

2. 1

2.2

2.4

2.5

2.3

2.4

2.G

2.7

2.5

2.8

2.G

2.9 3.9

2.9 4.1

3.1

3.2

3.4

3.G

3.4

3.5

3.6

3.7 4.0

4.2

4.1

4.4

.2

•l.G

5.3

•1

0.9

1.0

1.2
.3

1.4
.6

1.7

1.8

2.0

2. 1

2.2

2.4

3.3

3.4.54.1

3.5

3.7

3.8

4.2

4.4 5.3

4.7 5.7

5.0 6.0

5.2 | 6.3

5.5

5.6

G.O

6.3

7.3

10.

11.3

12.5

13.8

15.1

•1.8

5.8

1.0 1.2

0.9

1 .

1 . 1

1.3

1.3

1.5

1.4

1.7

1.0

1.0

1.7

2. 2.5

2.3

1.9

2.0

2.5

2.2

2.7

2.4

2.9

3.0

2.5

2.7

3.2 3.3

2.6

3.4

3.0

3.G

3.

3.8

3.3 4.0

3.5

4 .2

3.6 4.4

3.8

4.6

3.9

4.7

4.9

4.2

5.1

5.3

4 .4

4.0

5.5

4.7

5.7

4.8

5.9

Ci

. 1

5.0

6.4

G.R

7. 3

7. G

G.G

8.0

G.9

8 .4

7.2

8.7

7.5

9. 1

8.8

10.

G

12. 1

1

13.7

15.2
1G.7

G

7

1.0

1.1

1.1

1.2

1.4

1.4

1 .6

.G

1 .8

2.1

1.8

2.0

2.3

2.2

2.7

2.4

3.0

2.G

2.7

3.2

3.4

2.9

3.1

3.7

3.9

3.5

4.1

3.7

4.4

3.9

4.6

4.1

4.8

4.3

5 .0

4.5

5.2

4.7

5.5

5.7

4 .9

5.

1

G.O 6.5

5.3

0.2
G.4

5.5

5. 7

6.6

5.9 0.9 7.5

7.1 7.7

6. 1

7.3 8.0

G.3

0.7

7.8

8.2

7. 1

7.5

8.7

7.9

9.2 10.0

8.3

9

. G

10.0

8.0

10.5

9. 1

1

1.0

9.4

11.0

12.8
14 .6
1G.5

18.3

9

8

7. G

1.3

1.5

1.6

2.1

2.3

2.G

2.8

3. 1

3.4

3.G

3.9

4.2

4 .4

4.7

5.0

5.2

5.5

5.8

6.0
G.2

G.5

6.8

7.0

7.3

7.G

7.8 8.9

8.1

8.4

8.9

9.4

10.0

10.5

10.9

11.5

12.1

12.5

14 .6

1.2

1.5

.8

2.1

2.4

2.G

2.9

3.2

3.5

3.6

4.1

4 .4

4.7

5.0

5.3

5.G

5.9
G.2
G.5
G.8

7. 1

7.4

7.7

7.9

8.2

8.5

9.1

9.5

10.0

10.6

11.3

11.6

12.3

12.9

13.5

14.1

1 .0 1.0

1.5

1.7

2.0

2.2

2.5

2.7

3.0

3.2

3.5

3.7
4 .0

4.2

4.5 5.9

4.7

5.0

5.2

5.5

5.7

G.O

G.2

G. 7

0.9

7.2

8.4

9.0

9.5

10.5

10.9

11.4

11.9

13.9 16.5 18.3

10 11

1.1

1.0

1.3

1.1

1.3

1.4

.G

1.8

2.2

2.0

2.3

2.5

2.G

2.9

3.2 3.5

2.9 8.3

3.G

3.2

3.G

4.0

3.9

■1.3

4.7

4 .2

5.0

4.6

5.4

4 .9

5.2 6.8

5.8

5.5

6.1
G.5

G.2

0.9

6.5

7.2

7.G

0.9

7.2

8.0

8.3

7.5

7.8

8

. G

8.2 9.0

8.5 9.4

8.6 9.7

9.1 10.1

9.3 10.5

9.6 10.8

10.1 11.2

10.5 11.

G

12.2

11.1

12.1

13.0

13.8

12.5

13.1

14.4

15.

13.7

14.4

15.9

15.1

1G.6

17.3

15.7

17.7 10.5

1.2

1.5

1.7

2.0

2.3

2.9

3.5

4.1

4.6

5.2

5.8

6.4

7.0

7.5

8.1

6.7

9.3

9.9

10.4

11.0
1 1.6

12.2

12.6

13.3

13.9

14.5

15.1

15.7

16.2
1G.8

17.4

17.9

18.

G

-Feet/Minute

21 23.3

1.4

1.3 1.5
1 .5

1.7

2.1

1.9

2.2

2.4

2.6

2.8 3.4

3.2

3.4

3.6

4.1

4.8

4 .5

5.5

5. 1

G.2

5.8

6.6 7.7

6.4

7.5 8.5 9.4

7.0

8.2

7.7

8.3

8.9

8.9 9.6

9.

G 10.3

10.2 11.0

11.6

10.8

12.3

11.5

13.0

12.1

13.7

12.8

13.4

14.4

15.1

14.1

14.7

15.8

16.4

15.3

17.1

15.9
1G.G

17.9

17.3

18.5

17.9

18.5

19.2

2G

1.7

1.9

2.1

2.3 3.3

2.G

3.0

2.7

3.1

3.9

4.3

4.6

5.1
G.O

5.4

6.2

G. 8

7.6

6.9

8.5

10.2

9.2

10.0

11.1

10.8

11.9

12.6

11.5

13.7

12.3

14.5

13.1

13.9

15.3

14 .G

1G.1

15.4

17.0

16.1

17.9

16.7

1G.9

17.7

19.6

16.5

19.3

28

1.8

2.3

2.8

3 .2

3.7

4.6

5.5 6. 1

6.4

7.4

9.2

10.1

11.0

11.9

12.8

13.8

14.7

15. G

16.5

17.5

18.3

19.3

31

2.0

2.5

3.0

3.6 3.9

4.1

5.1

10.1

11.1

12.1

13.2

14.2

15.2

16.2

17.2

18.2

19.2

7.1

8.1

9.1

45

2.9

3.7

4.4

5.2 5.6

7.4

6.9 9. G

10.3
11 .9

13.2 14.5

14.7 1G.0

16.2 17.7

17.7 16.5

19. 1

19

3.2

4.0

4.6

6.4

6.0

11.2

12.9

3-1

2.2

2.8

4.5

5.6

0.7

7.8

6.9

10.0

11.1

12.3

13.3

14.5

15.
1G.7

17.9

18.9

19.5

2.7

2.4

3.4

3.0

3.G

4 .0

4.7

4.2

5.4 5.9

4.6

G. 7

6.1

7.3

8.1

8.5

9.4

10.7

9.7

12.1

10.9

13.4

12.1

13.3

14.8
1G. 1

14.5

15.7

17.5

16.8

16.9

G

18.2

'll

37

65

11.6

13.5

15.5

17.4

19.3

30

3.9

4.8

5. S

G. 6

7.7

9.7

4.3

5.3 5.9

6.4

7.3

8.5

10.7

12.8

14.9

17.1

19. 1

4.7

G.2

7.7

9.2

7.1

10.7

S.5

12.3

9.4

15.4

11.6

18.5

11.1

16.5

16.9

9.8

0.9

12.3

8. G

14.7

10.3

17.2

12.5

19.7

13.8

17.2

20.7

:

‘

130

ios

91

72

I

R. P. M. of work spindle

l.G

1.6

1.2

1.2

r.3

1.4

1.3

1.5

1.4

1.5

1.6

1.6

1.8

1.9

1.7

2.0

1.8

1

.9

2.1

2.0

2.2

2.4

2.1

2.2

2.5

2.3

2.6

2.4

2.7

2.8

2.5

3.3

3.4

3.8

4.2

4.6

6.0

(With back gears)

2.0

2.4

1.3

1.6

1.7

1.4

1.9

l.G

2.0

1.7

2.2

1.6

2.4

2.0

2. 12.5

2.7

2.2

2.4

2.6

3.0

2.5

2.6

3.1

3.3

2.8

3.5

2.9

3.0 3.6

3.8

3.1

3.7 4.4

4.2

5.0

4.7

5.7

G.3

5.3

5.8 G.9

6.3 7.5

4.

t

1

i.

Work
d la

me te r

2.500

2.750

3.000

3.250

3.500

3.750

4 .000

4.250
4 .500

4.750

5.000

5.250

5.500

5.750

6.000

7.00

8.00

9.00

10.00

11.00

12.00



.30

0.9 1.2

0.9

1.0 1.4

1.1 l.G

1

1.2

0.8

0.8

0.9

1.0

1.1 1.3

1.1

1.2 1.5

1.3

1.4

1.5

1.5 1.8

l.G

1.8

1.9

2.2

1.4

0.9

1.1

1.2

1.4

l.G

1.7

1.9

2.0

2.1

2.2

2. G

2.9

3.3

3.7

4.0

4.4

.0

.7

1.5

1.0 1.0

1.2

1.3
1 .4

1.5

1.6

1.7

1.8

1.9

2.0

2.1

2.2

2.3

2.4

2.8 2.9

. 1

.8

.9

0.9

1.0

1.1

1.1

1.2

1

1.2

1.3 1.6 1.7

1.4

1.4

1.7

1.9

2.1

2.4

2.G

2.8

1.1

0.9

0.9

1.0
1 .

1.2

1.2

1.3

1.4

1.4

1.5

1.7

1.7

2.0

2.3

2.G

2.9

3.2

3.5

.6

.5

0.7

0.7

0.8

0.9

0.9

1.0

1.0

1.

0.8

1.1

0.0

1.1

0.9

1.2

0.9

1.2

0.0

1.1

1.4

.0

1.3

3

2.6

1.7

2.0

2.1

1.9

2.3

2.0

2.5

2.2

2.7

2.4

2.9

2.6

3.1

2.7

3.3

2.9

3.5

3. 1

3.7

3.2

3.9

3.4

4.1

3.6

3.7

4.3

3.9 4.5

I .7

4.1

4.8 5.5 6.4

3.5 j 4

2.3

2.5

2.7

3.0

3.2

3.4

3.7 4.2

3.9

4.1
4 .4

4.6

4.8

5.0 5.8

5.3 G.O

5.5 6.3

7.3

8.3

9 .2

10.

1

11.0

4.2

2.7

2.6

2.9

3.0

3.3

3.1

3.6

3.4

3.7

3.8

3.9

4.1

4 .4

4.7

4 .4

5.0

4.7

5.2

5.0

5.5

5.2

5.5

5.8

6.0

6.3

6.7

7.3 7.7 9.1

6.8

9.9

11.0

12.8

13.2

5.2

5

3.4

3.3

3.7

3.6

3.9

4.1

4 .2

4 .4

4.8

4.6
4 .9

5.

5.2

5.5

5.5

5.8

5.9

6. 1

6.2

G.5
G.6

7.2 7.5 8.1

7.5 7.6 8.4

7.9

10.9

12.3

13. G

14.9

16.2

30

7

•1

.6

5.0

5.5 5.8

6.0

6.4

6.9

9.2

12.8

7.1

4 .6

5.3 5.8

6.3

6.6

7.3

7.8

8.3

6.7

9.2

9.7

10.1

10.7
1 1.

11.6

13.5

15.5

17.5

G.2

5.6

3.7

4.1

4.0

4.5

4.9

4.4

5.3

4.6
.5.7

5.1

5.4

G.l

1

G.O 7.3

5.9

6.9 7.8

6.2

7.3 8.3

G.G

7.7 8.7

7.0

G.5

7.3 8.1

G.8

7.7

7.2

8.2

9.5

8.5 9.6

8.9 10.1

9.3 10.5

9.7 10.9

8.6

11.3

10.3

13.0

14.6

16.2

17.8

S

5.2

5.9

6.6

6.2 7.1

7.7

6.8

7.3

8.2

7.8

S

9.5

8.4

10.

8.9

10.6

9.4

11.2

10.0

11.7

10.5

10.9

12.3

12.9

11.5

13.5

12.1

1

14.1

12.5

14.6 16.5 IS.

9 10

6.6

7.9

8.5

3.2

9.8

. 6

10.5
11 . 1

1

11.

12.5

13. I

13.7

14.4

15. 1

15.7

12 j 13 j 14 ’ 19

| 8.5 I 9.2'12.4

7.9
I 9.4 llO.li

8.7

9.4 10.2 111.

10.2 11.1 '11.9

11.0 11.9(12.8

11.8 12.7 113.7

12.6

13.7 14.7

13.3

14.4 15.5

14.1

15.3 16.5

5

14.9

16.2 17.5

15.7,17.1

16.5 17.9

17.3

18. 1

3

21

13.7

19.6

15.1

13.7

16.5

0

11.9

17.9

16.2

17.4

I

.

JONES &. LAMSON MACHINE COMPANY, SPRINGFIELD, VERMONT, U.S.A.

MANUFACTURERS

OF: RAM & SADDLE TYPE UNIVERSAL TURRET

AUTOMATIC THREAD GRINDING MACHINES .

THREADING DIES AND CHASERS

. OPTICAL COMPARATORS . . . AUTOMATIC OPENING

LATHES

. . .

FAY AUTOMATIC LVTIIES . . .

Jones & Lamson Automatic Thread Grinders

(6 x 36; 5 x 30, machine 110135 and up:

8 x 48, machine 100174 and up)

Change Gears For Pitches And Leads Using 10 Pitch Lead Screw

f J

Our Engineering Department will be pleased to furnish change

gear combinations for any pitches or leads not given in these tables.

The change gear positions are shown at the left.
Spacers are placed behind change gears A & D. The
heavier spacer is placed in front of gears B & C before
closing the door.

Arrangement of change gears

Table I. Standard Pitch Threads

Change gear ratio =

(Fast)

Using back gears, =

(Slow)

ENGLISH

PITCH

2

2*

2h

2f

3

3*

3£

4
4*

5

5£

6

7
8
9

10

11

114

12 60
13

.

'

:

J

i*

:

14
15
16
18

20 36
22

24 60
26 40
27
28 40

30*

32

36
40
44
48

The gears required with this table are ordinarily

supplied as standard equipment.

LEAD

(INCHES)

.50000
.44444
.40000
.36364
.33333

.30769
.28571

.25000
.22222
.20000
.18181
.16667

.14286
.12500
.11111

.10000
.09090
.08696

.08333
.07692
.07143

.06667
.06250
.05556

.05000
.04545
.04167
.03846
.03703
.03571

.03333
.03125
.02777

.02500
.02273
.02083

5

threads per Inch

1

threads per Inch

A

96
96
96
96 48 66
96
96 60 72

96
60
60 36
72
72
60

60
60

60
72
60
60 32

60 52
60

48

60
60

48

40

36
36
32
36
30

30

5 x lead (Inches)

or,-

or,

B

32
36
32

48

52

56
32

36

43
36

56
48 36
48

48

66

46
72

56 96
60

72

72
66
72

52
72
56 24

72
72
72
72
66

72

T

lead (Inches)

1

C

60
60

48

60
60

60
48
48
48
40
48

48

32
32

48

48
32
32
30
24
32

48 96
30

24

24
32

32
30
30
24
24

24

D
72

72
72

72

72
72
72
96
66
96

72
72
72
96
96
96

96
96

72

9648
96

96
96
96
96
96

96
96
96

96
96
96

Table II. Metric Pitch Threads
Change gear ratio =

(Fast)

Using back gears ratio =

(Slow)

Change gears required in addition

the 13 furnished

grind standard metric pitches.

(1)50;

METRIC
PITCH(m/m)

10.00*

10.50*

11.00*

11.50*

12.00*

12.50*
*Use back gears

0.40

0.50

0.60

0.70

0.75

0.80

0.85

0.90

1.00

1.25

1.40

1.50

1.75

2.00

2.25

2.50

2.75

3.00

3.25

3.50

3.75

4.00

4.25*

4.50

5.00

5.50

6.00

6.50*

7.00*

7.50*

8.00*

8.50*

9.00*

9.50*

(1)127.

with machine in order to

A

24
24

24

30
36

32

34
36
36
60

56

36
56
60
50

60 .

66
72
52

56 32 50
60
96
60
72
60
66
72
52
56
72

48

68
60

57

60

63
66
69 50
72

60

50 x lead (m/m.)

127

B

96
96
96
96
96

96

80
96

72

96 50
80

48

32

48

32
48
48
48

32

32
48
96

32
24
24
24
80
96
96
80
80
48
60
4 8
60
60
60
60

48

A = 1st Driver
B = 1st Driven

C = 2nd Driver

D = 2nd Driven

x i

127

40
50
60
56
50
60
50
60
50

50

50

25

4 0

36
50
50
50
50

50
50
34
50 127
50
50
50
50
60 127
50 127

50

50 127

36
50
40
50 127
50

50

50

2

ead^pl/m •

(1)25;

C

_!

to

D

127
127
127
127
127

127

127
127
127
127
127
127
127
127
127
127
127
127
127
127

127

127
127

127

127

127
127

127
127

127
127

127
127
127

127

JONES &. LAMSON MACHINE COMPANY, SPRINGFIELD, VERMONT, U.S. A.

Fora AA0—1—200—42

MANUFACTURERS OF:

AUTOMATIC THREAD GRINDING MACHINES ..

RAM fc SADDLE TYPE UNIVERSAL TURRET LATHES . . . FAY AUTOMATIC LATHES

THREADING DIES AND CHASERS

OPTICAL COMPARATORS ... AUTOMATIC OPENING

49

Table III. Diametrical Pitches
Change Gear ratio = 5 x Lead

NUMBER

PITCH

100

50
48

100

32
30

100

24
22
20

18

100

16
30
14

1

\

12

22

32

10

9

8
30
22

7
20
32

12

22

5 1/3

5
24
14

9

oo

4

18

3 1/2

3 1/3

16

3

14 5

2 2/3

2 1/2

12

7

9

o

9

5 1/3

1 3/4
1 2/3

8

l 1/2

7

2 2/3
2 1/2
6
3 1/2
4 1/2
3 1/3
5 1/3
1
4 1/2
2 2/3

1 3/4
1 2/3
4 5

1 1/2
3 1/2

2
2

OF

STARTS

1
1
1

3

1

1

4

1
1

1

1
6
1

O

1

1
2

3

1

1

1

4

3

1

3

5

o

4

1

1
5
3

O

5

1
6

5

1

1

5

1

1

1

5

3

4

1

5

3

1
1
5

1
5
2
2
5
3
4
3
5

1
5

3

2

2

2

5

3

1

*Use back gears.

= 1 x Lead

LEAD

(INCHES)

.03142
.06283
.06545
.09425
.09817
.10 172
.

12566

. 13090
.14280

.15708
. 17453

.18850

.
.20944
.22440
.26180*
.28560
.29452
.31416
. 34907-
. 39270*
.41888*

.42840*
.44880*
.47124*
.49087*
. 52360*
.57120*
.58890*
.62832*
.65450*
.67320*

.69813*

.71400*

.78540*
.85680*
.87266*
.89760*
.94248*
.98175*

1.04720*

1.12200*

1.17810*

1.25664*

1.30900*

1.34640*

1.39626*

1.57080*

1.74533*

1.76715*

1.79517*

1.88500*

1.96344*

2.09440*

2.24 394 *

2.35619*

2.51327*

2.61792*

2.69272*

2.79245*

2.82736*

2.94517*

3.14159*

3.49057*

3.53420*

3.59039*

3.76991*

3.92689*

4.18879*

4.48787*

4.71226*

6.28320*

19635*

(Without back gears)

(With back gears)

A _B

24 96
4 8 96
50 96
71 48
71 96
60

72 7 1 113

60

60 71 113

75

72 71 113

75

66 71 113
60 48 71 113
75 54
72 48
30 96
71 36
75 42
40 9 6
75 33

75 32
80 32
40 72
60 96
4 8 72
45 66

71 56
71 48
71 96
60 72
60 66
71 32
60 60
75 72
60

60
75
60 48
90 66

75 54

80 56

72 4 8

75 4 8

80 4 8

75 4 2

7 5 40

96 4 8

100 42

56
54
66

75 36

42

90
80 36
80 32
75 27
90 32
72 56
96 32
90 64
90 60

90 56

81
90
90 48

81
72
81
95 50
90
90
81
90
81
90
96
90

81 24

D

C
71 113

7 1 113
71 113
36 113
75 113

71 113

71 113
71 113
60 113
71 113
71 113
71 113
71 113

71 113
71 113
71 113
71 113

71 113

40 113

36 113
75 113
71 113
71 113
30 113
71

113

71 113

71 113

71 113

71 113
71 113
71 113
71 113
71 113
71 113
71 113
71 113
71 113
71 113

71 113
71 113
71 113
71 113
71 113
71 113

71 113

71

53

71 113

53

74

53

74

53

74

48 74 53

50 74 53

74
42 74 53
36 71
40 74

40 74
36 74 53

32 74 53
35 74
30 74
32 74
32 74
28 74

53

53
53

93 60

53

53
53
53

53
53

74

95

53

36

Table IV. Linear and Circular Pitches

Change gear ratio = 5 x Lead (Without back gears)

LEAD (INCHES)

.15385
.18750
.21428*
.23076*

.27778-
.30000*
.31250-
.35714-
.37500
.38462*

.41667-

CO

.42857

UJ

z

.46154

<_>

.55556*
.57143

Q_

.60000*

ae

■<

.66667*
.71429-

o

.75000*

O'

.

80000*

<j>

.

S 57 1 l*

o

.88889*

z

-c

1.00000*

1.14286*

CC.

1.20000*

UJ

z

1.25000*

1.33333*

1.50000*

<i

1.60000*

z

1■66667*

o

1.71429*

1.75000*

o

2.00000*

2.25000*

CC

2.40000*

2| 2.50000*

2.66667*

-I

3.00000*

^ 3.33333*

00 3.50000*

3.75000*

4.00000*

UJ
UJ

4.50000*

CO

5.00000*

5.25000*

6.00000*

6.25000*

7.00000*

7.50000*
8♦00000*

8.75000*

9.00000*

10.00000*

^ 1 x Lead (With back gears)

A
60

72
24
24
40

36
60

60
72
60
48

96

96

60
96
72
72

96
60
96
72
96
72

96
72
60
96
96
72
96
96

72
96
96

96

72

96
96
96
84

100

96
96

96
84
96
96

84

96
96

84
96
96

B

52
48

56

60 48
48

56

24

52

72
48

48
36

36
60

36
56

40 48
60
56
48
30
56

30
36
48

32

36

48

56

24

40

48
60
30
40
24
40

48
48
48

48

48

48

40

40

48
40

32

Table V. Metric Pitches, for British Association Threads

lead (a/n)

Change gear ratio = ^ x

B.A.S. SCREW NUMBER

0

1

2

3

4

5
6
7
8

9

10

11
12
13

Change gears 20 to 100; 113, 120, 127, are stocked Tor

immediate shipment. Back gears are advised for leads of

more than .625'’

diameter work.

14

; also to get low work speeds for large

50

LEAD ( a/ a)

1.0
. 90
.81
.73
.66

.59
.53
.48
.43
. 39
.35
.31

.28
.25
.21

2

A

30

36 96
36
24 . 96
24 &6 66 127
24 96
24
24
24
24

28
24
24

24 96
24 96

C
48

60
48
4852

4872

24

32
60
32

"50

60

60
32
60
48

32 96
30

36

TO

32
40
48
48
72

36
48

60
60
56
60
72
72

100

60

60
60

100

72

72
72

100

9648

96

100

100

100

96

100

96

100

B

72 60 127

96 54 127

96 53 127

96 48 127
96 43 127
96 39 127

96 30 127
96 31 127
96 28 127

D

72

96
96
96

96
96
96

96
96

96
96
56

52
96

56

96

72

96

72

60
72
96
72
96
96
6040
72
60
72

60
96
72

9632
60
48
72
48
72

60
40
36

32
40

32

32

32

30

32

24
24

3232
30

C D

60 127

73 127

59 127

25 127

21 127

r t

i

I

j

t

'!

*

12x45" , Jones & Lamson Automatic Thread Grinders

(For Machines, Serial Number 120117 & Up)

Change Gears For Pitches And Leads Using 8 Pitch Lead Screw

A

(X-

✓

/

B

o

Arrangement of change gears

Table I. Standard Pitch Threads

Change gear ratio

(Fast)

Using back gears, =

(Slow)

ENGLISH

PITCH

2

2i
2k

2g

3

3i

3 k

4

:

■

;
'

?

i

’

I

The gears requlred with this table are ordinarily
supplied as standard equipment.

Fora AAQ-300-43

4k

5

5k

6

7
8

9
10
11

Ilk

12
13
14

15
16
18

20

22
24
26
27

28
30

32

36
40
44

48

JONES & LAMSON MACHINE COMPANY, SPRINGFIELD, VERMONT, U.S.A.

MANUFACTURERS OF: RAM & SADDLE TYPE UNIVERSAL TURRET LATHES ... FAY AUTOMATIC LATHES ...

AUTOMATIC THREAD GRINDERS ... OPTICAL COMPARATORS ... AUTOMATIC OPENING THREADING DIES AND CHASERS

(INCHES)

.50000

.44444
.40000
.36364
.33333

.30769

.28571

.25000
.22222
.20000
.18181

.16667
.14286

.12500
.11111
.10000
.09090

.08696
.08333

.07692
.07143
.06667
.06250

.05556
.05000

.04545

. 04167
.03846
.03703

.03571
.03333

.03125
.02777
.02500

.02273

.02083

>—.

OD

c

--------------------------------

=

2 x threads per Inch

2 x threads per inch

LEAD

5

1

80 96
60
80
60
80
80

80
80

80

80

80

80

40
40
40
40
40

30

60
30
30

30

30
30

30
30
30
20
20
20

20
20
20

20
20
20

Consult Qur Engineering Department for Other Pitches & Leads

The change gear positions are shown at the left.
Spacers are placed behind change gears A & D. The
heavier spacer is placed in front of gears B & C before
closing the door.

Table II. Metric Pitch Threads

Change gear ratio =

(Fas t)

A

0 x lead (Inches)

or,

or,

’

B

40

30

40

88

40

52

56

40 30

72

96

88

96

56

80
72
80
88
46

96
52

60
96

72

80

88
52

72
56

60
80

72

80

88

96

2

lead (Inches).

2

C

60
40 24
60
96
30
60 120

60
60

72
60
60

60
60
60 120
60
60

40
40

40
40
40
60
40

40
40
40

30
40

30

30
30

30

30

30

30

120

120
120

120
12056
120
120
120

120
120
12096
120
120
120

120

120

120
120

120

D

96
72

120

72

120

96
120
120

120

120

96

120
120

96

.

Using back gears ratio =

(Slow)

Change gears required in addition to the 12 furnished
with machine for grinding Standard Metric Pitches. (1) ?5;

(1) 42; (l) 48; (1) 50; (1) 55; (1) 63; (1) 64; (l) 127.

METRIC

PITCH

0.50

0.60

0.70

0.75

0.80

0.85

0.90

1.00

1.25

1.40

1.50

1.75

2.00

2.25

2.50

2.75

9.00

3.25

3.50

3.75

4.00

4.25*

4.50

5.00

5.50

6.00

6.50*

7.00*

7.50*

8.00*

8.50*

9.00*

9.50*

10.00*

10.50*

11.00*

11.50*

12.00*

12.50*

*Use back gears

A B

20

28
2572

32

30
30
25

30 96
28 96
30 80
42

60

36

60

55
72

52

63
60
60

34
72
80

96

30

30

30
40

34

30

38

60
42

55
46
40

60

A = 1st Driver
B = 1st Driven

D = 2nd Driven

25

127

lead (m/m.)

x

5

127

80
96
80
80
96

80

80

96
96
64
96
80
96
64 50
72
64
48
80
64
64
64
64
96
96

80
96
96

80
80
96 40
80
96
80
80
96

C — 2nd Driver

2

lead (m/m

2

C

30
30
30
30

25

34
30

40

50
60
50
50

40

50
50
50
50

50
50

40

25
50
50
50
50
52

56
50
48
60
60
50

50
48
50
60
50

.)

D

127
127
127
127
127

127
127
127
127

127

127

127

127

127

127

127

127

127

127

127

127

127

127

127

12788

127

127

127

127

127

127

127

127

127

127

127

127

127

127

Table III. Diametrical* Pitches

Change

PITCH

100

50

48

100

32
30

100

24
22
20
18

100

30

14
12
22
32
10

30
22

20
32
12
22

24
11

22

2 2

18

16

14

12

gear ratio = 5/2 x Lead (Fast)

NUMBER

OF

STARTS

1
1
1
3
1
1
4
1
1
1
1
6
1
2

1
1
2
3

1
9
8

7

5 1/3
5

9

4

3 1/2

3 1/3

3

2 2/3
2 1/2

7
9
2
9
5 1/3

13/4"
1 2/3

8 5

1 1/2
7
2 2/3
2 1/2

6

3 1/2
4 1/2

3 l/3

5 1/3

1
4 1/2

2 2/3

1 3/4

1 2/3
4

1 1/2

3 1/2

2

2

*Use

1

1
4
3

1
3

5

o
4

1

1

5

3

o

5
1
6
5
1
1
5
1
5

1

1
5
3
4

1
5

3

1

1

1

5

2

2

5

3

4

3

5
1

5
3
2

2

5

2

5

3

1

back gears.

= 1/2 x Lead (Slow)

LEAD

(INCHES)

.03142
.06283
.06545
.09425
.09817
. 10472
.12566
.13090
.14280
.15708

. 17453
. 18850
. 19635
.20944
.22440
.26180

.28560

.29452

.31416
. 34907
.39270*
.41888*
.42840*
.44880*
.47124*

.49087*

.52360*

.57120*
.58890*
.62832*
.65450*
.

67320*-

.69813*
.71400*
.78540*

.85680*

.87266*

.89760*
.94248*
.98175*

1.04720*

1.12200*

1.17810*

1.25664*

1.30900*

1.34640*

1.39626*

1.57080*

1.74533*

1.76715*

1.79515*

1.88500*

1.96344*

2.09440*

2.24394*

2.35619*

2.51327*

2.61792*

2.69272*

2.79245*

2.82736*

2.94517*

3.14159*

3.49057*

3.53420*

3.59039*

3.76891*

3.92689*

4.18879*

4.48787*

4.71226*

6.28320*

B

A

37 106

24

96

96

25
36

96

_________________ 25 113

71
40 96

48 96
50 96
50
60

50 72

72

71
71
75 84
50
75 66
75 64

60 48
75 54
30
32
30
30 84
36 96
71
40

30
4 5
40
50 96

64

88
96

96

64
72

48

96
96
88

4 0 72

50
60 96
60
50 72
60 84
72
71 96
71
50 56
75
72 72
75

60
80
60
75

90
80
96
45

45

45
54
45
45
54
72
81
93
45

60
81
72
81
90
96
90
81
90

C
27 120

113

71

113

71

113

71

71 113
71 113
71 113
71 113

71 113

71 113

71 113
50 113
60 113

71 113

71 113

71 113

71 113
71 113
71 113

71 113
71 113

71 113
71 113
71 113

64

25 113
96
66
96
80

5671

88

88

71 113
71 113
71 113
71 113

71 113

30 113

71 113

71 113

71 113
71 113
71 113

96

96

80

72

71 113
71 113
75 113

SO 113
71 113

71 113

71 113

71 113
56
72
48

54

64

60
56
64

71 113
71 113
71 113

71 113

71 113

56

71 113

64

71 113

64 74 53

74
74
74

50 74 53
48 74 ’ 53
56

74 53

72

74 53
80 74 53
50 76 96

40 74

48 74

64

74

56 74

60 74 53
64 74
64 74
56 74 53

48

74

40

74

51

Table IV. Linear and Circular Pitches

Change gear ratio = 5/2 x Lead (Fast)

= 1/2 x Lead (Slow)

LEAD (INCHES)

D

53

53
53

Table V. Metric Pitches for British Association Threads

Change gear ratio

B.A.S

.15385
.18750
.21428
.23076
.27778

.30000*
.31250
.35714*
.37500
.38462*
.41667*

oo

LU

.42857
.4 6154

o

.55556*

o_

oe

-c

=5
O
DC

o

o

1.00000*

oc

1.14286*

1.20000*

LlJ

1.25000*

1.33333*

1.50000*

1.60000*

o

1.66667*

1.71429*

1.75000*

o

2.00000*

o

2.25000*

ac

2.40000*

o

2.50000*

_| 2.G6667*

3.00000*

LU

3.33333*

CD

3.50000*

3.75000*

4.00000*

UJ

4.50000*

CO

5.00000*

5.25000*

6.00000*

6.25000*

7.00000*

7.50000*

8.00000*

8.75000*

9.00000*

10.00000*

. SCREW NUMBER LEAD(n/m)

.57143
.60000*
.66667
.71429*

.75000*
.80000*
.85714*
.88889*

0

1

2

3
4

53

53
53
53

53
53

53
53

Change gears 20 to 100; 113, 120, 127, are stocked for
immediate shipment. Back gears are advised for leads of
more than .625"; also to get low work speeds ror large

diameter work.

5
6
7
8

9

10

11
12

A

60
60
40
40
30 72

30

40 80

30
72
30
40
72
72

80
96
96
80
40 56

40
96

96
80

96

80
60
60
80

96

96
56
80
60
96
SO
80
72

56

60
96LUl

72

60 96
96
80
80 32

90
90

100

90

100

25 .. lead (m/m)

X

127

1.0
.90
.81
.73
.66
.59
.53

.48
.43
.39

.35
.31
.28

B

52
40

56

52

80

56
96

52

56
c2

96

56

40

80
60
56
72
40
56
80
40
30
40

60
60
56
96
40
40
40
40

30
40
30
96
96
40
96 40

32

40

32
32
30

32
30
30

C

40
30
60
60
40

48
30
40
30

60
80
80
40

6016
3080
60

120

120
120

120
120

2

A

30

30
27
21

20

20
20
30

20

21
21
20
20

B_ _C _D_
120 50 127
120 45 127
120 45 127

95 39 120
80 33 127

82 20 84

71 20 108

120 24 127

S2 22 113

112 26 127

96 20 127
114 20 115
120 21 127

D

120

96
80

80

120

1 20

96
120
120
12040

120

96
96

120

72

1 20

72
60
72
30
4072
40
30
40
9630
30
40

48

72

40

60

60
72
30 60
60
60
80
60

60

84
96
75

8084

80

80

90

90

120

120
120
120
120

120

120

120

120

120

120

84

96

60
96

96

72

80

96

96

96
9680
40
40

72

30
48
64
60
60

60
60
60

60

60

A

L

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OPERATOR’S MANUAL

ON

THE T& L- AUTOMATIC TRUING DEVICES

(See dressing the Wheel in a J & L Automatic Thread Grinder Operator’s Manual)

INSTRUCTIONS FOR OPERATING THE STANDARD 60° TRUING DEVICE:

Whenever it is necessary to change diamonds in the Standard 60° Truing Device (See Draw

A

ing NX-

715), first withdraw the Truing Device from the wheel one or two revolutions with crank
#20193. The Truing Device is then withdrawn from the wheel head casting, and the diamonds are
removed by loosening clamping screws #8224. New diamond tools are then put in place loosely in
the diamond holders. Next, take the diamond setting gage A-5107, locating the diamonds so they
touch the beveled face of the gage when half way across the path of motion. Tighten them in place
and insert the Truing Device in the wheel head casting, fastening it in position in the usual manner.
With the diamonds still in the position noted, advance the Truing Device by means of hand crank
#20193 on the squared end of the diamond truing shaft, until the diamonds are heard to touch rotating
grinding wheel. One or two dressings will prepare the wheel for service.

OPERATOR’S NOTES

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INSTRUCTIONS FOR USE OF NX-574 UNIVERSAL TRUING DEVICE

63

The Universal Truing Device makes possible the grinding of thread forms of any included
angle from 15 to 90 degrees as shown on Chart #38-154-2C. This Truing Device has a very wide
range of usefulness and under certain conditions can produce thread forms with curved flanks or

with combinations of two different angles. If you have a special thread grinding problem and are in
doubt, our Engineering Department will be very glad to advise you as to whether your special thread
forms can be generated with this device.

When the two outside diamonds are on their dressing strokes, they move from the center of
the Truing Device out in a uniform motion. This motion is controlled by suitable formers on the
former holder NX-574-2. (See Drawing NX-574.) These formers may be alike as in the case of

symmetrical thread forms, or they may have different angles as are needed for Buttress threads
shown on Chart 38-154-2C.

stroke,

they

are moved forward by the forward motion of shafts NX-574-32. Thus it is seen that the

At the same time the diamonds are moving outward on the dressing

flank angles dressed on the wheel point depend on the forward motion given the diamonds by the
forward motions of shafts NX-574-32, and the motions of the diamonds outward from the center of
the Truing Device.

The Truing Device as it is received will have been tested for proper operation, and for angle

on GO thread forms. To start Wheel Dressing, it is only necessary to insert the Truing Device into

the machine, as explained in Chapter Two. Then follow the instructions given for Thread Grinding

in Chapter Four. Note: The same set of formers are used for all 60 Threads.

In changing diamonds, first set the two outside diamonds. A diamond setting gage is supplied

for this purpose. (See NX-

574) A J & L Comparator furnishes the easiest method for setting these
diamonds. The gage is laid horizontally in a V block on the Comparator table. The gage should
rest against a squared end of the V block. Now locate the tip NX-574-78 on the intersection of the

horizontal and vertical chart lines. Then remove the gage from the V block; and the two diamond
holding blocks NX-574-

14 from the Truing Device. Now set the diamond holding blocks NX-574-14
in the V block, one at a time. Loosen the diamond shafts in their blocks, NX-574-14, and adjust the
shafts until the tips of the diamonds fall on the horizontal chart line; thereby placing the tips of both
diamonds at the same height as the point of the diamond setting gage.

Now with

the

shadow of the tip of one diamond on the vertical chart line, move the Compara
tor table 1/32,rto the right by means of the table micrometer screw. Then with the set screw in part
NX

-574-48 of the diamond holding block, move the diamond holder until the shadow of the tip of its

diamond again falls on the vertical chart line.

Take the second diamond holder andfollow the same procedure,

except .the Comparator table
is moved 1/32" to the left instead of to the right. These adjustments will make one diamond 1/16"
higher than the other when the two diamonds are mounted in the Truing Device. Otherwise, without
this difference in height, the diamonds might interfere with each other and be damaged. After the
diamonds have been thus set, they and their holders are ready for mounting in the Truing Device.

The gage makes certain that the diamonds are set exactly in the center of the wheel so that
an equal amount is taken off each side. It is, of course, important that the point of the wheel fall in
the center of the axis of rotation of the wheel head itself so that its position will be correct when
setting up on steep helix angles. If a J & L Comparator is not available, a surface plate.together

with blocks and the usual equipment may be used to locate the diamonds as just described.



Only thread forms which have flat or sloping roots, or sloping crests require the use of the

back diamond. In such cases the diamond tool is tightened in place so that the diamond projects l/4
beyond the diamond holding block. (It is not necessary to remove the back diamond holding block
from the Truing Device.) The adjustment for this diamond is shown in Section EE of NX-574. To

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bring the diamond toward the grinding wheel thereby making the root form wider, turn the dial

counterclockwise. This dial is in the center of the bushing, NX-574-

52 and is locked in place by a
set screw. If sloping roots are required, loosen screws 8510 so that the bushing NX-574-52 may be
turned either right or left, depending on the slope desired.

One further adjustment is provided which affects the flank angles. Reference to the sketch

in the lower left hand corner of NX-574 shows two graduated screws NX-574-58. Also 2 screws

8783. The formers are pivoted on pins and so by loosening screws 8783 it is possible to change the
flank angles small amounts by means of the graduated screws NX-

574-58.

This Truing Device will ordinarily be left at 0° helix in a plane parallel to the axis of the
work for all thread grinding where the helix angle does not exceed 3 or 4 degrees. When it becomes
necessary to grind steeper helices, we recommend that the Truing Device be set at the angle of helix
of the thread being ground. Reference to the rear view of the Truing Device shows three clamp
screws. When these screws are loosened, it is possible to turn the barrel of the device by means of
a hand crank applied to stem #51466. The amount this is changed relative to rear end bracket
NX-574-

18 can be read directly on scale #51468 which is graduated in degrees.

This device is hydro-statically lubricated. Always keep this device filled with oil to the high
level of the gage.

The Universal Truing Device has all of the features of the other Truing Devices, such as

automatically

slowing

down the wheel for

dressing

and provision is made for backing off the diamonds
when they are on the return stroke. These functions are all automatic and require no attention on
the part of the operator.

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TRAVEL OF DIAMONDS ON UNIVERSAL WHEEL TRUING DEVICE

Note:

The Universal Wheel Truing Device is equipped with three
dressing diamonds, one for each flank angle, and one for
dressing the flat. An adjustment of 5 either way is pro

vided on the latter for threads with sloping roots.



TRAVEL OF DIAMONDS ON PANTOGRAPH WHEEL TRUING DEVICE

Start ‘B’

Start ‘A’

Note:

The Pantograph Truing Device is equipped with two dress
ing diamonds traveling as shown.

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(Drawing CH-5042)

---------‘B

- ‘A’ Finish

’ Finish



INSTRUCTIONS FOR OPERATING THE PANTOGRAPH TRUING DEVICE

The Pantograph Truing Device is used in dressing the wheel for grinding threads with round
root and crest, such as the A.P.I. Standard Threads as-used in this Country, or Whitworth Standard
as used by the British.

This Truing Device works on a different principle than any of the others that we build. It

can easily be seen that a thread with round top and bottom is a different grinding problem than one

which has straight sides and flat root or crest. We have had many years

’ experience in grinding

threads of this type. This experience has led us to approach the problem in the following manner:

The diamonds which are used as tools for dressing the wheel to the proper shape have in this
case to be lapped with a radius to very exact dimensions. These lapped diamonds are accurately
centered in a square shank. At the present time the wheel for grinding this type of thread may be

dressed with any one of several different diamond tools.

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cessary to know that for a given pitch a certain diamond will be required. Two diamonds are used
in this Truing Device - each diamond dressing one-half of the complete thread, that is, from the
center of the crest down over the flank and across one-half of the root. In other words a round top

and bottom thread is ground complete. It is not necessary to grind the crest of the thread at a sec

ond operation.

which are mounted on the top of the Truing Device. These formers are very carefully and accurately

The choice of which tool to use is determined by our Engineering Department. It is only ne

The path that these diamonds of known radius will take is determined by a pair of formers

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ground. Otherwise, the Truing Device is much like the Standard 60 Degree Truing Device in that it
has the same controls, mounted in the same way for relieving on the return stroke and for slowing

the wheel down during the dressing operation.

A separate set

of

formers is required for each different pitch or form of thread that is to be

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Electrical connections are made in the bed in the same manner as with the 60 Degree Truing

Device. Once the operator has learned the few simple adjustments that are necessary in setting up

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this Truing Device, he will have no more trouble with it than with any other. A study of Drawing

NX-628 will give a very good idea of the construction of this unit.

Setting Up Truing Device

*

In starting a new job with this Truing Device it is first necessary to select the formers which

will be needed. On these formers will be stamped or etched the size of diamond which is to be used

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with them. Take off whatever formers are on the Truing Device and replace with the new ones, be
ing very careful not to disturb the adjusting screws, #53457. If care is taken in mounting these form
ers, and in setting the diamonds, the number of adjustments necessary to reproduce a correctly



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formed thread are reduced to a minimum.

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gage A-5120. This is marked with the serial number of the Truing Device which is found on the

rear end bracket. When this device is set on a Jones & Lamson Comparator, the exact location for

The next step is to set the diamonds. With each Truing Device is shipped a diamond setting

the diamond setting in the block can be made.

To make this setting it is necessary to remove from the front of the Truing Device crank

the diamond holding block, #51627. Mount this setting block on Comparator table in some suitable

Vee, both vertically and horizontally.

Locate exact position of cutting edge. Insert diamond in the

diamond holder and place in the V-Block so as to register cutting edge in the location previously
determined upon by the setting block. When using the Comparator it is possible to set these two
diamonds to the same height within .0005" or closer.

Set screws will be found on these diamond holding blocks which allow the diamond holder to

be moved lengthwise relative to the Vee. The point height of this diamond is very important and it

must always be .250" from the top of the crank which supports the diamond holder. This is all taken
care

of

in

the making of the original diamond setting block. Any change in the height of this diamond

will change the included angle of the thread ground.

After both diamonds have been carefully clamped in place in the holders, these holders are

returned to the diamond cranks on the Truing Device and clamped securely in place.

These diamond tools must maintain their form, in order to function properly and produce ac
curate threads. It is always best to save wear on these diamonds as much as possible. When they
go into action on the face of the wheel, a bead is raised which will be the form of the thread which

it is desired to grind. Everything outside of the form that is actually used in the grinding represents
extra work for the diamonds. We recommend that the purchaser of a Pantograph Truing Device also
equip himself with one of our Hand Dressing Attachments, which makes possible the dressing off of
the sides of the wheel in such a way that only that portion of the wheel that is to be used is left for
the diamond to work on.

By careful dressing on this restricted part of the wheel it will soon become evident from ob

servation that the diamond has brought the face of the wheel to the desired form. Great care should
be taken in dressing to make sure that the diamonds are not required to cut off more than .0G05" at
any one time. This will be three to four notches on the ratchet of the diamond feed mechanism.



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Next, grind a trial thread with the wheel as it is, in order to check the form as produced on

the wheel. Because of the close tolerance to which we work, it is practically impossible to make
the setting exact on the first try. It will, however, be very close to the form which we wish to get if

all of the instructions previously given have been carefully followed. In order to see more clearly
what form may be produced if the diamonds are not set in exactly the right position, we have included
with these instructions a chart CH-5090, which shows the various types of form which are likely to
be produced with diamonds out of place. As a matter of convenience we call the diamond which is
on the right side of the operator as he faces the machine in the operating position, the right hand
diamond, and the

opposite diamond, the left hand diamond. Whatever adjustments are necessary will
be made through screws, #53457, behind block #51084, and the same screw which acts as a stop for
the formers on the former block. The adjustment necessary will be very slight.

Adjustments

for angle have been made at the factory before the Truing Device is shipped.
Should it be necessary to make some slight changes, it will be noted that the formers are mounted
on former blocks, #51502 and #51503. These former blocks in turn swivel about a center stud,
#51157. These former blocks can be adjusted by set screws so that the angle can be changed by very
small amounts either greater or less than the standard angle as determined by the former.

OPERATOR’S NOTES

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CHAPTER SIX

THE RELIEVING - INTERRUPTING THREAD - AND HOB GRINDING ATTACHMENT

75

The Jones & Lamson relieving attachment is used with the standard Jones & Lamson Auto

matic Thread Grinder to grind relieved straight or tapered taps, and hobs with or without lead.

(Either straight or spiral fluted - right or left hand.) Our engineering department will furnish de

tails to companies interested in using this attachment to grind tap and die chasers.

SETTING UP THE RELIEVING ATTACHMENT

Relief cam setting for relief to start at

the front edge of the lands. Dotted lines
show position of cam if a portion of the
lands are to be ground concentric. (Taps
so ground are known commonly as con-

eccentric. The graduations indicate a-

mount of concentricity.)

To set the relieving cam, remove a

change gear from the relieving box.

Grinding wheel

This pointer indicates
amount of relief.

Remove tap land

locator before

grinding -

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Cutting edge of lands

L.H. TAP

R.H. TAP

Location of Even Fluted Taps

(Note positions of 52240)

Work with an odd number of flutes is located the same as work with an even number of flutes
except the spindle nose is rotated through half a revolution so relief will begin at the cutting edge of
the land. After the set up is complete, disengage the headstock and rotate the spindle 180 . Gradu
ations and a pointer make it easy to determine half a revolution.

Locating

Device

is used to locate lands on a production basis by putting land locating pointer 50958 in place of

part 50729. (SeeA-5033) For right hand threads the

lands on work to be threaded from the solid: The Jones & Lamson Thread Matching

land

locating projection face of part 50958 faces
upward and is level with the center points. For left hand threads, projection face of part 50958 faces
downward, level with the center points.

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Take, for example, taps with an even number of flutes to be threaded right hand. Mount the

first tap with its dog in the

Bench

Matching Device. Turn the tap until a cutting edge of the tap rests
against the land locating projection. Tighten the dog with the tap in this position. (This tap is first
mounted in the Bench Matching Device so that the position of the Bench Matching Device driver will

be synchronized with the driver on the headstock spindle, after the tap land is located correctly in
the machine.) Then take the tap and dog and locate them in the Thread Grinder. Do not lnnsen the_
dog. Mount the machine land locator for R. H. taps as shown. Disengage the headstock clutch gear

with the indexing lever. Rotate the spindle

by hand until the cutting edge of a land rests on the index
finger. Re-engage the headstock clutch. It may be necessary to jog the index lever of the headstock,
back into position by using the safety stop lever: move the workslide as little as possible, otherwise
the setting of the relief cam will be disturbed.

On pieces other than the first of a given lot, the only land locating necessary is to locate the
tap or hob and dog in the Bench Matching Device. Because the driver of the Bench Matching Device
is now in definite relation to the driver of the headstock spindle nose. Two dogs should be used

when work is being ground in lots so the finished piece may be removed from the dog and the next
piece dogged while the first piece is ground. Caution: After the first tap is located correctly, do
not disengage headstock clutch gear, as this would disturb the relation established between the Bench
Matching Device drive pin and headstock spindle driver.

Locating lands on pre-threaded work: For pieces in lots fasten face plate 50715 on the head-

stock spindle,

using

three screws 8545. Take out the regular spindle center and replace it with 50717

and the parts attached to it. (See A-5033) Always keep the graduated face plate clamped in place
with clamp 50722 and screw 8217, except when changes are being made in the face plate reading.
Relieved pre-threaded work differs from ordinary pre-threaded work in that the thread is brought

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into position by turning the graduated face plates of the Bench Matching Device and headstock.

First set the face plate readings of the Bench Matching Device midway between zero and
maximum. (Part 50958 must be substituted for 50729 as mentioned.) The work and dog are placed
in the Bench Matching Device. (The Bench Matching Device is used to establish a relation between

the face plate of the Bench Matching Device and the face plate of the headstock.) A land is brought

around until the cutting edge rests on the land projection point. The dog is now clamped in place.
Next turn the face plate until the thread pointer causes the dial indicator to read zero. Now take the
reading of the graduated face plate

on

the Bench Matching Device. Loosen screw 8545 and turn grad

uated face plate on the headstock spindle until the reading is the same. Now transfer this first piece

and the dog to the Thread Grinder. Locate the lands, using machine land locator. Locate the pre-

roughed thread in relation to the grinding wheel by using the In-built Thread Matching Device and
machinist’s blue. When the wheel is correctly located in the thread groove the piece is ready to
grind. For following pieces it is only necessary to locate the work in the Bench Matching Device as
described and to make the reading on the graduated face plate oLthe headstock the same as the read
ing on the Bench Matching Device face plate.

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Dogging taps on the square: On most work ground from the solid it is commercial practice

to mill flutes in definite relation to the squared ends so that the taps can be dogged on the square,

thereby saving the bench matching operation.

Grinding threads onpre-roughed blanks: As in grinding any other previously roughed blanks,
it is advisable to use a vitrified wheel if the roughed blank is off lead. A resinoid wheel may flex
and follow the rough thread.

Relief on the outside diameter of work: The threads are first ground with or without relief,

as the case requires. Relief is then ground on the outside diameter, using a grinding wheel with a

wide flat crest.

Checking amount of relief with a Tones & Lamson Comparator

: Insert the piece between the

centers on the Comparator. Set the Comparator for the helix angle on the piece. (See tables of helix

angles in the back of this manual.) Adjust the Comparator table so that the shadow of one groove at

the cutting edge of a land falls on an outline of the thread root on the chart. Set the graduated ring

on the elevating handwheel to read zero, then tighten the ring in place with the knurled set screw.

Now rotate the piece until the shadow of the back edge of the land is cast upon the chart. Adjust the

Comparator table so the shadow of this groove at the back of the landfalls on the outline of the thread
root. The table elevating wheel reading is the amount of relief on the land.

Spiral fluted work: In locating lands on spiral fluted work, the point of the land locator must
always rest directly opposite the wheel point. Grinding relief on spiral fluted work requires differ
ent change gear combinations in the relieving gear box than are required for straight fluted work.

(See formulae for spiral fluted work.) A possibility of trouble in figuring these gears lies in the fact
that some of the gears may be too large to go in the gear box or too small to mesh. Such cases ne
cessitate selecting another combination. If, for any reason, difficulties are encountered, we are al
ways glad to help our customers with any gear combination problems.

INTERRUPTED THREAD GRINDING ATTACHMENT

Threads can be interrupted on work which has an odd number of flutes. The threads are first
ground,
less than thickness of thread at root diameter.

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as has been explained in this chapter. (1) Dress a flat on the grinding wheel point somewhat

(2) If the machine is not set up for interrupting, disconnect the oil

■

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27

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iv

tubing which connects the relieving attachment to the cam drum as-
sembly. Remove the four binding bolts and lift the relieving attach

ment from the machine and arrange the gears as shown. Replace

the relieving attachment.

(3) Open relieving attachment

door to reach this mechanism.








GEAR ARRANGEMENT FOR

INTERRUPTING THREADS.

(6) For interrupting, be sure
interrupting
place. Not hob grinding cam

-46.

(7) Loosen this screw if it is
necessary to change cams.

(8) Remove a change gear so cam -67 can be turned until the push rod rests in the middle of the
cam’s low part. Lock the cam in this mid-position by replacing change gear.

(9) Locate the lands as explained previously, and the machine is set for interrupting. --If not quite
all the interrupted part is ground out, remove a change gear and turn the cam a few degrees.

(10) It may be desirable to put relief on the work beginning at the front edge of the lands being ground
out. This gives the work a more finished appearance. To do this, set up for relieving in the usual
manner before setting the interrupting cam.

cam -67 is in

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(5) For interrupting threads, have this
lever in slot as shown, so cam is en
gaged. When not interrupting, disen
gage the cam with this lever.

(4) Loosen when interrupting.
This screw regulates the amount
of wheel back-off and should not

allow any more back-off than

necessary to clear the uninter
rupted thread.
not interrupting.

Tighten when






(11) When interrupting and relieving at the same time,
in pins which project into the holes around the rim of the interrupting cam -67 locknut.

cam -67 is turned for adjustment by pushing

A

THE TONES & LAMSON HOB GRINDING ATTACHMENT

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The Jones & Lamson Hob Grinding Attachment is used to grind annular grooves or threads -

with or without relief, straight or spiral fluted.

Taking off change gear box. (See A5168) Drain oil by removing plug from housing bottom

and open the change gear door. Take out change gears. Loosen screw 51635 and take off nut 8806;

then remove gear arm 51570; also the four 5/8" nuts which bind the change gear box to the work-
slide. Remove cover 52310; it is seen that lock nut 9759 interferes with gear 51556 when removing
the box. A flat is ground on 9759, so after disengaging the two speed-change clutch levers on the

l

work speed control box turn the locknut so it does not interfere. The housing is then removed by
turning the

splined end of the lead screw 51910 clockwise; thereby pushing the change gear box from

the workslide, until disconnected.

Some operators prefer to remove the lead screw before the change gear box. To do this take

off the plate held on by 12 screws 8529. Then take out the lead screw and pull the change gear box

from the four studs.

Putting on the hob grinding box. (See NX537) Caution: Do not remove hob grinding box lead
screw. Each box has an individual lead screw because accurate factory adjustments would be dis~
turbedif the

lead screw were removed. Take out the top one of the four studs in the end of the work-

slide. Make sure the splined driving tube and bearing are in place. (The same splined tube is used

for both the

hob box and the change gear box.) Lift the hob box into position so both the splined shaft

(which connects the hob box and the headstock) and the lead screw are in line with the holes into

which they fit. After pushing the hob box as far as it will go, turn the splined end of the lead screw

counter-clockwise until the box is positioned against the workslide. (Turn locknut 9759 so it does
not interfere with gear NX537-4.) Fasten the hob box in place and assemble change gears for the
pitch of the hob to be ground, using the change gear arm and other parts which are common from the

2

change gear box.

The internal grinding attachment and hob grinding. The chart ‘ Hob Grinding Data* for 20"

wheel shows when it is necessary to use the internal grinding attachment with the 1-1/2" wheel in

; i

;

place of the 20" wheel. Instructions for the internal grinding attachment follow in the next chapter.

Relieving straight fluted work without lead i

s done as just described, except the relieving

attachment is set for the number of flutes.

Relieving spiral fluted work without lead is done with the same change gears as straight fluted

work. To set the hob box for spiral, take off cover 51185 and move pointer to desired spiral setting.

i

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(The boxisusually shipped set for right hand spirals.) For left hand spirals shaft 51267 is used in

stead of shaft 51213. These shafts are changed after removing covers NX537 -2, 51185, NX537-15

and opening the door. Do not touch locknut 20025

, as this would disturb the sprocket chain which is

difficult to reassemble. Remove nut from left hand end of shaft 51213. Shaft 51213 is then turned

out. Shaft 51214 is removed after loosening nut 8801 and taper pin 51215. Reassemble the unit,



using the parts for L.H. spirals given on NX537. The machine is now set for L.H. spiral fluted work.

:

RETTING UP FOR HOB GRINDING

The set-up shown on this sheet is for grinding one way, dress before finish cut.

79

(1) Locate cam

drum dogs.

(5) Locate truing

feed dogs.

(8) Remove top
hob grinding box
cover.

(9) Jog workslide along
until this roll is half

way between two slots,

(Graduations indicate
half-way points.)

(2) Locate feed gear

dogs.

(6) Position lever in

cam box.

->

0



P ^

O'

(3) Position headstock

indexing lever.

<80 T

0

GEAR

'll

W ’

f(7ar^-^

\

A

D;

GEAR ARRANGEMENT
POR HOB GRINDING.

(7) Direction of slide travel be

fore final cut.

(4) Position control

panel elector

switch.

Q

o

(10) If the machine

L

AisE Z7T

GEAR

<s>-

\ -SPACER

i\

.- NOT

^ /// GEAR

* is not set up for hob

U

.

se

grinding,disconnect
the oil tubing which

connects the reliev
ing attachment to
the cam drum as-

T

r

,

bolts and lift the

relieving
ment from the ma
chine and arrange
the
Replace relieving

attachment.

SRlHPthta

One. "*

ay

0

TWo v<*Y



Remove

bly

-

four binding

attach

gears as shown.

;







(14)
sure hob grinding cam- -46
is in place, not interrupting

cam -67.

(15) Loosen this screw to
change cams.

(16) Turn cam -46 until

push rod rests in low part
of cam. Rotation of cam
is accomplished
pushing in spring pins
which project into holes
around the locknut.

(17) The set-up for hob grinding is complete. Insert the work between centers and follow the usual

thread grinding procedure: except grinding is always started at the headstock end of the work.

For hob grinding, be

--------

after

^11) Open relieving attachment door to

reach this mechanism.

(12)

Loosen when hob grinding. This
screw regulates the amount of wheel
back-off and should not allow any more
back-off than necessary to clear the
threads being ground. (Tighten when not
hob grinding.)

(13) For hob grinding, have this lever
in slot as shown, so cam is engaged.

When not hob grinding, disengage the

cam with this lever.

WHEEL SPEED CHART

INTERNAL GRINDING

Approximate Surface Ft. Per Min.

f !

f :

| V •

h

f!-i

t

• ■

■

Diameter
of Wheel

4

3-3/4

3-1/2

3-1/4

i

.

:

‘

i;

3

2-3/4

2-1/2

2-1/4

2

Pulley-

Ratio

3:1

4:1

3:1

4:1

3:1
4:1

3:1
4:1

3:1
4:1

3:1

4:1

3:1

4:1

3:1

4:1
3:1

4:1

1000
3140

4180

2950
3930

2750
3670

2560
3410

2350
3140

2160
2880

1960

2620

1770

2660
1570 1890

2090 2510

1200

3770
5020

3530

4720

3300
4400

3070

4080

2830
3770

2590
3450

2360
3140

2120
2830

1400

4390
5850

4130

5500
3850

5130

3580
4770

3300

4400

3030

4030

2750
3660

2480
3290

2200

2940

1600

5020

6690

4720

6280

4400

5860
4080

5450

3770
5020

3450
4610

3140

4180

2830
3770

2510
3360

Dial Reading

1800

5650
7530

5300
7070

4950

6600

4600

6130

4240
5650

3890
5180

3540

4700

3180

4240

2830
3780

2000
6270

8360

5890
7850

5500
7320

5110

6810

4710

6280

4320
5760

3930
5230

3530

4710
3130

4200

2200

6900
9200

6480

8630

6050

8060

5620

7490
5180

6910

4750

6340

4320
5750

3880

5170

3460
4610

2400

7530

10010

7070
9420

6600

8800

6130
8180

5650
7530

5180

6810
4700

6280

4240
5650

3780
5040

2 600

8150

10890

7 360

10210

7150
9530

6640

8850

6120
8160

5620
7500

5100
6810

4580

6110

4100
5440

11720

11000

10270

2800

8790

8240

7890

7150
9530

6580

8810

6050
8060

5500
7340

4950

6580

4400

58 60

3000

9410

125 60

8830

11790

8240

11000

7660

10210

7060
9430

6480

8 640

5890
7860

5300
7060

4710

6280

2750

1650

2200

1880

1750

1570

1-3/4

'

1-1/2

1-3/8

1

!

:

1-1/4

1-1/8

1

7/8

3/4

4:1
3:1

4:1

3:1

4:1
3:1

4:1
3:1

4:1

3:1

4:1
3:1

4:1
3:1

4:1

3:1

1830

1570

1920
2570

1650

2200

1510

2010

1830

1650

2200
2930

1880

2510

1750

2300

1570

2090

1880

1670 1880

2470
3300

2120
2830

1940

2590

1770
2360

1590
2130

1650

3 670

2360
3140

2160
2880

1960
2620

17 60
2360

1570

2090

1820

1570

3020

4030

2590

3450

2370
3160

2160
2920

1940

2590

1730

2300
1510

2020

1720 1880

3300
4400

2830

3770

2590
3450

2360

3140

2130
2830

1880

2510
1650

2200

3570

4720

3060

4080

2800
3740

2530

3400

2300

3070

2040
2720

1790

2390
1510

2040

3850
5140

3310
4410

3020

4030

2750

3670

2470

3300

2200

2 940

192 0

2560

1650

2200

4120

5500
3540

4720

3240
4320

2950

3920
2 650

3540

2360

3140

2060

2750

1770
2350

THE JOHES * LAMSON MACHINE COMPANY

SPRINGFIELD, VERMONT, U. S. A.

April 25, 1938

CHAPTER SEVEN

THE INTERNAL THREAD GRINDING ATTACHMENT FOR TG-636 AND TG-1245

The

Jones & Lamson Internal Thread Grinding Attachment comes supplied with the necessary
belts, guards, pulleys,
If threads smaller than 1-1/2" in diameter are to be ground, our Engineering Department will be glad to
furnish information on necessary equipment.

The

Internal Attachment may be mounted on any machine in the field. To change from external

grinding to internal grinding, first remove both guards from the front of the wheel head casting. Take

off the wheel adapter. Disconnect the oil tubing which connects the wheel head and spindle and take off

the wheel spindle assembly, A-5078, by removing the three 1/2" socket head screws. The Attachment

may now be set in its place on the two hollow dowels. Fasten with four 1/2" socket head screws. The
same V belts are used with both the Internal and External spindles.

and a supply of grinding wheels for grinding threads 1-1/2" in diameter and larger.

A drum type reverse switch for the wheel motor is located on the side of the bed. The internal

grinding wheel should turn counterclockwise when viewed from the nut and washer end of spindle.

The Pantograph type Wheel Dresser is swung out of the way when not needed. The graduated
wheel on the front of this
tions represent .0005" on the radius of the grinding wheel. (The wheel infeed shaft on the front of the

machine is used to feed the wheel in the amount dressed from the wheel. Always remove the backlash

from both the dial shafts before compensating, if the dial readings are to be accurate.)

This Dresser for Internal Thread Grinding will dress any form on the wheel which can be dressed
without other Truing Devices. A former 6-1/4 times larger than the thread form to be ground is con

veniently mounted. One former may be used for all pitches of 60 degree National Form threads. How
ever, separate formers are needed for each pitch, if the thread requires a controlled root or crest. Near

the top of the truing lever is a follower which is held in the truing lever with a set screw. The diamond

tool block in which the diamond is inserted is also held in the lever by a set screw. This truing lever
rests on a pivot pin when the device is used, and is free to rotate as far as necessary in any direction.
If both V threads and threads with radii are to be ground, we recommend that two levers be ordered with
the Dresser, one for V threads, and the other for threads with controlled root and crest. The set-up for

straight sided thread forms is simpler than the one required for Whitworth or A.P.I.

Wheel Dressing is done by hand. That is, the operator moves the follower along the contour of
the former at a rate of speed best determined by experience.

attachment is used to indicate the amount dressed from the wheel. The gradua






The following is a list of the correct followers and diamonds to be used with different formers:

(Note that radius of follower is 6.25 times radius of diamond.)

Follower NX-515-2

Follower NX-515-4
(Radius = .06875)

Follower NX-515-5

(Radius = .04368)

Follower NX-515-6

(Radius = .0250)

Follower NX-515-7

(Radius = .10625)

For o{her forms check with our Engineering Department.

For 60°, 29° or any other straight sided threads, unformed diamonds #NX-574-75.

For Whitworth formers (9-12" pitch), or any former where .011 radius diamond is

used. Diamond #NX-668-l, .011 radius.

For Whitworth formers (13-20 pitch), or any former where .007 radius diamond is

used. Diamond #NX-668-l, .007 radius.

For Whitworth formers (22-34 pitch), or any former where .004 radius diamond is

used. Diamond #NX-668-l, .004 radius.

For Whitworth formers (2-1/4-8 pitch), or any former where .017 radius diamond
is used. Diamond #NX-668-l, .017 radius.

LOCATION OF DIAMOND AND FOLLOWER FOR STRAIGHT SIDED FORMERS

The quickest and easiest method for checking the position of the diamond and follower in the tru

ing lever makes use of the Jones & Lamson Comparator with a 30" work table. At either end of the lever
are center holes. Mount the lever between centers on center in the Comparator. The button type follower
NX-515-2
of the follower NX-515-2 are on the centerline by projecting them all onto the horizontal chart line of
the Comparator, this line to be on center with Comparator centers. Tighten the diamond holder and

follower in place. The truing lever is now set up to produce straight sided thread forms symmetrical or
buttress.

used. Temporarily locate the high point of the diamond and the high point of the follower on the center-
line of the lever by projecting them all onto the horizontal line of the Comparator chart. The cutting edge
of the diamond should point towards the ball and socket pivot. Drop the comparator table a distance equal
to the radius of the diamond. Adjust the point of the diamond so that it is projected onto the horizontal

line of the Comparator. Clamp it in place with the set screw. Now turn the lever through a few degrees

both backwards and forwards. If the diamond point does not rise above, or fall below the horizontal line,

the diamond is correctly located with the center of its radius on the centerline of the lever. Now drop

the Comparator table down a distance equal to the radius of the follower, from its position on the center-
line of the lever. Then loosen the follower and bringing it up so that the projection of the tip just touches
the horizontal line on the Comparator chart. Tighten it in position. Turn the lever through a few degrees
both backwards and forwards. If the top of the follower does not rise above, or fall below the horizontal
line, the diamond is correctly located with the center of its radius on the centerline of the lever. Mount
it in the dresser on the pivot and fasten the small guard on the truing lever by means of two screws. The

Dresser is adjusted at the factory so that the diamond contacts the center of the grinding wheel. If this

adjustment should be disturbed, there is a 3/8
This stud may be adjusted until the diamond in the truing lever is on the same level as the center of the
internal grinding wheel.

is used with any straight sided thread from. See that the tip of the diamond and the polished face

LOCATION OF DIAMOND AND FOLLOWER WHEN GENERATING THREAD FORMER

WITH CONTROLLED ROOT AND CREST

Choose a diamond of suitable radius and the correct follower as indicated on the former to be

"stud on which the Dresser rests against the work slide.



If, after the setting is made according to the above directions, it should be found that the thread

form on the grinding wheel being dressed either is too large or too small, the trouble lies in the rela

tionship of the pivot point of the ball and socket pivot, to the tip of the diamond. If the thread form dressed

on the wheel is too small, raise diamond holding block. If the thread form is too large, lower holding

block.

SETTING THE DIAMOND AND FOLLOWER WITHOUT A COMPARATOR

It will be seen that two finish ground flats have been provided on the back of the lever. These

surfaces are parallel with the center line through the lever. By resting the lever on a surface plate and

using setting blocks and indicator, the same results may be obtained as with a Comparator.

FORMERS:

Now select the former for the thread to be ground and screw this former in place at the top of the Dresser.



i

TESTING THREAD FORM:

Take a piece of round stock of not too large diameter and rough out a groove on an engine lathe. This

groove should be approximately the shape of the thread form to be dressed on the wheel. Put this piece

!

in the Thread Grinder and finish grind the roughed out groove with the formed internal grinding wheel.
Checking this groove in a J&L Comparator will tell if the correct form has been dressed
Plug gages or internal micrometers are used to test the thread diameter of the work itself.

the wheel.

on

INTERNAL THREAD GRINDING STOP:

This stop is used in place of the R. H. trip dog. The front part of this stop can be swung down in place
when actually grinding the internal thread, and lifted up out of the way when it is desired to withdraw the
grinding wheel from the work.

1

!

1'

HOLDING THE WORK IN THE THREAD GRINDER:

Mount a chuck, face plate, or jig on the headstock spindle to hold the work. The piece should be roughed

out as closely as practical to its finished size. In roughing out the thread be sure to locate the roughed
hole from a surface which can be used to locate the piece in the Thread Grinder. In setting up the machine,

it must be remembered that the helix angle for an internal thread is opposite to that of an external thread.

GENERAL INSTRUCTIONS:

Match the threads in the piece to the wheel point, using the same methods as for external threads.

Cam NX-536-

be relieved. See chapter on the Relieving and Interrupted Thread Grinding Attachments.

11 is used in place of Cam NX-536-

10 in the Relieving Attachment, if pieces are to

!

l

j

.

;

JZWBZ. —

D

O

No. flutes

2
3

4

5
6

7

8

Change Gears for Relieving Straight Fluted Work

12x42 ,12x45", Jones & Lamson Automatic Thread Grinders

A

' vO

B

O c

A

30
30

48
45 48

54
56
60

B

64
64

32

48

32
32

Arrangement of relieving
attachment change gears

Change gear ratio = 45/256 X number of flutes.

C

45
54

30

60
60
45
48

D

60
48
64

64
64

64
64

No. flutes

9

10

11

12

13

14

A

54
45

66
60

52
56 32

A = 1st Driver
B = 1st Driven

C = 2nd Driver
D = 2nd Driven

B

32
32

32

48

32

C

45
60

*45

54
45
45

D

48

48
48

32
32
32

i

!

:h

■

Change Gears for Relieving Straight Fluted Work Using Back Gears

Change

No. flutes

6

7

8

9

10

A

24

30

30
30
30

B

64
64

64
64
48

Additional gears (not supplied as standard equipment) for relieving straight fluted work when using back

gears. (1) 24, (1) 42.

gear ratio = 9/256 X number of flutes.

C

45
42

48
54
45

D

80
80

80
80

80

No. flutes

11

12
13

14

A

30

B

64

54 48
39

42

48

64 45

C

66

30

36

Determining the Change Gear Ratio for Relieving Spiral Fluted Work

Let L=Lead of Spiral (inches) :

When the work and spiral are the same

T=Threads/inch

hand, the change gear ratio equals

:

When the work and spiral are different hands, the change gear ratio equals,

The constant is 9/256 when using back gears.

F=Flutes in work.

X

(LT-1)

45F

’ 256

45F

(LT4-1)

X

256

LT

LT

D

80
80

64
60

EXAMPLE: Find change gears for relieving 3 fluted work with |°

threads per inch and a spiral ed of 10 inches Both thread and sp.ral R.
Therefore use the first change gear ratio formula. ^

engineering 'departmental! be ptaed to M

Note: Our

change ge„- combinations for any pitch or iead

not given in this table.

COMPANY, SPRINGFIELD, VERMONT, U. S. A.

JONES & LAMSON MACHINE

CH-5128

MANUFACTURERS OF: UNIVERSAL

GRINDERS .

OPTICAL COMPARATORS .

Tl/RRET

lathes

fay aitomatic

.

automatic

OPENING

lathes

threading dies and chaser

45x3(10xl0

. VI TOM

. .

_

1) 2

vtic thread

?*

673

sT

x —

(g) (D)

«

Change Gears for Pitches and Leads Using a 2Vz m/m Lead Screw

12x45", Jones &. Lamson Automatic Thread Grinders

'X

A

(FOR MACHINES, SERIAL NUMBER 120117 & UP)

; !■

If!

I'!

I

;

M

■

;
!

i

f

ill

!

r

B

O c

o*

The change gear positions are shown at the left.
Spacers are placed behind change gears A & D. The
heavier spacer is placed in front of gears B & C before

closing the door.

Arrangement of change gears

Table I. Metric Pitch Threads

Change gear ratio =

^Using back

Metric

Pitch

0.40

0.45

0.50

0.60

0.70

0.75

0.80

0.85

0.90

1.00

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

3.25

3.50

3.75

4.00

4.50

5.00

5.50

6.00

6.50

7.00

7.50

8.00

9.00

10.00

11.00

12.00

gears ratio =

A

24

24
24
24
28

36
80

34
36

30

30

30
36

36
30

72
66

72

36
72
72
96
72

66
96
72
72

72
96

72
80

72
72

Note: Standard metric pitches; 0.50m/m
m/m.

lead (m/m.)

8.

lead (m/m.)

40

B

96
96

96
80
80
96

48
80

80
80
72
80

48

72
96

48
72

48

48
48
48
48
48

3672
48
48
48
24
24

48

24

48

36
24 48

30
52

30
30
30

30

36
30

52

28

30
36

36
72

66

24

27

30
30
30
30

72
30

30
40
36
36

28

48
72

80
36

A = 1st Driver
B = 1st Driven

C = 2nd Driver
D — 2nd Driven

Table 11. Standard Pitch Threads

X

Change gear ratio —

)•

C

D

120
120
120
120
120
120

120
120
120

120

96
72

96

96
80
96

96

120

96
9628
96

120

80
96

72
80
96
96

96
72

96

96

96

12.00

(

Ratio using back gears —

English

Pitch

2

214

2*4
2%

3
3«

314
4
414

5
5 1/4
6

7
8

9

10
11
1114

12
13
14
16
18

20
22

24
26
27
28

30
32

36

40

44

48
50

A

96
64

60

96
80 60
50

80 60
50
72

48
48

25 8 I
48
25

25
25
25

25
25
25
50
25
24

25
25
25

32

20
25

24

32

25

30

20

The leads produced by the change gears given in this

25

63 X threads per inch

threads per inch

63 X

8

40

B

48
36

72

66

52
5650

63
90

66

72

96

63
63

84
84

63
63

63

63

63

63
66

63

84

81
84

72
84

81
96
84

84

84

table are .000125 inch short per inch of thread due
to the conversion formula.

200 X

or lead (inches).

63
40 X

or lead (inches)

’

63

C

30

50
96

50
50
64

64
50
64
50 63
50
50

96
50 63

64

64

64
64

48
48 78
48

24
36

40

32
32
32
2532
25

32
32

25
20
24
20
24

)•

D

63

63

63
63
63

63
63

84

72
63

63
63

72
80

66

69

72

84
96
81
96

84
96
78
84
84

84
96

84
84
99

9696
90

JONES &. LAMSON MACHINE COMPANY, SPRINGFIELD, VERMONT, U.S.A.

MANUFACTURERS OF: UNIVERSAL TURRET LATHES . . . FAY AUTOMATIC LATHES . . . AUTOMATIC THREAD

CH-5124

GRINDERS . . . OPTICAL COMPARATORS . . . AUTOMATIC OPENING

THREADING

DIES AND CHASERS

Change Gears for Grinding Hobs without Lead

6x36" Jones

Lamson Automatic Thread Grinders

The change gear positions are shown at the left. Spacers are placed on

shafts A & D before the change gears A & D are placed on the shafts. The

heavier spacer is placed in front of gears B & C before closing the door.

Table VI. Grinding Standard Pitch Hobs without Lead (10 pitch lead screw)

40 X lead

, or,

1.81818

1.66667

1.538 16

1.48148

1

A
72
80

B
66
60

80 60 60
80

60

Threads
Per Inch Ratio

8

9
10
11

5.00000

4.4

4144

4.00000

3.63636

A
80
96
96
80

Change gear ratio =

B
36
36

36

44

C
72
60
72
72

40

Threads per inch

Threads

D
32
36
48
36

Per Inch Ratio
22

24
26
27

C
60
60

D
36
48
52

60 54

i

■ I

:

ny>

12
13
14

15
16
18
20

N

ote

3.47826

3.33333

3.07692

2.85714

2.66667

2.50000

2.22222

2.00000

: Our engineering department will be pleased to furnish change gear combinations for any pitch or lead

96
96 48
96
96

80
80 48
80
96

46

52
56

54

54
60

60
60

60

72
60
60
60

36
36

3660
36

40

40
40
48

28
30
32
36

40
44
48

1.42857

1.33333

1.25000
l.lllll

1.00000
.90909

.83333

80

72
80
80

80
80
60

60
60
48
60

60

66
80

not given in this table.

60

60
54
60

54
54
60

56
54
72
72

72
72
54

CH-5107-2M-9-42

84

Change Gears for Relieving Straight Fluted Work

6x36" Jones &. Lamson Automatic Thread Grinders

Arrangement

of relieving

attachment change gears

A == 1st Driver

B = 1st Driven

C == 2nd Driver
D = 2nd Driven

Change gear ratio = 9/16 X number of flutes.

Table VIII.

No. flutes

9
10
11

12

13
14

A

72
72
72 24

72
72
72

72

No. flutes

I !

'

Table VIII A. Change Gears for Relieving Straight Fluted Work Using Back Gears

Ratio

2
3

4

5
6
7

8

1.12500

1.68750

2.25000

2.81250

3.37500

3.93750

4.50000

B

32
32 36

18
48
32

36

72

C

36

36

60
72 32
56 32

D

72
48
48

32

32

Ratio

5.06250

5.62500

6.18750

6.75000

7.31250

7.87500

A

72
72
72

72
78*
72

B

32
21
24

32
32
24

C

72

60

66

72
72
63*

Change gear ratio = 9/80 X number of flutes.

No. flutes

5
6
7

Ratio

.56250
.67500
.78750

A

54*
54*
56

B

48
60
32

C

36
36
27*

D

72
48
60

No. flutes

10

1 1

12

Ratio

1.12500

1.23750

1.35000

A

54*
36

54*

B

24
60
24

C

36
66

36

D

32

32

32

24
24
24

D

72
32
60

■

i

I

;

8
9

*Not supplied as standard equipment.

.90000

1.01250

72
54*

48
32 36

36

60
60

13
14

1.46250

1.57500

54*
54*

32

52*
56

60
6032

Determining the Change Gear Ratio for Relieving Spiral Fluted Work

Let L=Lead of spiral (inches) : T = Threads/inch :

When the work and spiral are the same hand, the change gear ratio equals, yg- X

i

*

When the work and spiral are different hands, the change gear ratio equals, 9F x (-TJi ^

The constant is 9/80 when using back gears.

EXAMPLE: Find change gears for relieving 3 fluted work with 10

threads per inch and a spiral lead of 10 inches. Both thread and spiral R. H. 9X3(10X10 —

Therefore use the first change gear ratio formula.

L=10:

T = 10

:

F

=3:

Always be sure a proposed change gear combination will fit in the change gear box before ordering gears.

NOTE: Change gear combinations for any number of flutes not given in these change gear tables, can be

supplied.

F = Flutes in work.

9F

. . (LT-1)

LT

16°

LT

16X10X10

1)

2673

1600

(A)

(C)

33

= — X —

32

81
50

(B) (D)

CH-5107-2M-9-42

_

inK

Dia. Gashes

A

1

B
C

A

1-1/2

B

C

A

2

B

C

A

2-1/2

B

C

A

3

B

C

A

3-1/2

B

C

A

4

B

C

A

4-1/2

B

C

A

5

B

C

A

5-1/2

B

C

A

6

B

C

A

6-1/2

B

C

A

7

B

C

A

7-1/2

B

C

A

8

B

C

HOB GRINDING DATA FOR 20”

6

7°53

.259
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8°4’

.389
.056

8°16’

.519

.076 .056

8°27'

.648
.097

’

1

.222
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6°56f

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7°4

r

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7°14'

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7°24

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8

5°54*

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t

6°3

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6° 11

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6°20

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6° 2 8 r

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6°36

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6°45»

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9

5°15

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5°22

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5°30

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5°38

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5°45

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5°53

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6°0

.696
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6°8

.784

(NOTE: For more
relief consult our
Engineering Dept.

.084

6°15

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.906

B

i

A = Maximum Clearance Angle
B = Width of Gash and Width of Land
C = Thousandths Relief

WHEEL

10

4043'

T

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4°50'

’

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i

4°57

’

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5°3»

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f

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5°23

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11

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4°42

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l

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f

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5°44'

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5°19
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5°31

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12

3° 56

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4° 2 ’

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4°8«

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4°19

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i

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1

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t

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t

4° 30

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4°35*

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4° 46

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5°15«

1.044
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3°23'

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3^28*

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T

3°32

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i

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f

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