Oliver Instrument Model 624 Automatic Face Mill Grinder - Manual Grinder

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OLIVER

AUTOMATIC

INSTALLING

OPERATING

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REPAIRING

MODEL

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FACE

624

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GRINDER

OLIVER INSTRUMENT COMPANY

ADRIAN, MICHIGAN

US. A.

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OPERATING INSTRUCTIONS

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OLIVER MODEL 624 AUTOMATIC

FACE MILL GRINDER

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OLIVER INSTRUMENT COMPANY

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ADRIAN, MICHIGAN

U.S.A.

INDEX - PAGE 53

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Page 3

FIGURE

Page 4

INSTRUCTIONSJfOR SETTING UP AND OPERATING THE

OLIVER MODEL 624 AUTOMATIC FACE MILL GRINDER

The Oliver model 624 face mill grinder is a machine designed to automatically grind the teeth on cutters of the face mill type. The operation of the unit is 100^ automatic after set-up and does not require any operator attendance once the grinding cycle has been started.

The ultimate form obtained is governed by means of a cam which controls the move ment of the ram and grinding wheel spindle as they reciprocate back and forth and grind the teeth of the cutter. In most instances the entire desired shape is ground on each pass over the tooth including the periphery, lead angle, face, dish and intermediate radii.

The soft steel backing is also ground at the same time on most tungsten carbide tipped blades. This is possible because of the automatic dressing device which is incorporated in the machine. The grinding wheel spindle is automatically fed downward with each stroke of the ram. The amount of downfeed is adjustable and is usually set for an amount equal to normal wheel wear encountered during the grinding of a single tooth.

A diamond in a fixed position accomplishes the dressing of the grinding wheel. Therefore, the top of the diamond represents a fixed grinding line and it is not necessary to compensate for grinding wheel wear in order to maintain minimum run out. The second benefit obtained from the automatic dressing feature is the fact that we are always working with a freshly dressed surface on the grinding wheel thus producing a cool cut. This permits the simultaneous grinding of the soft

steel backing on most tungsten carbide tipped cutters without any loading of the

grinding wheel.

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The indexing of the cutter from one tooth to the next is taken care of auto matically. In addition, the rate of speed of the tooth return to the finger is automatically controlled. A setting is provided for automatically controlling the total stock removal. An additional control is also provided to govern the rate of stock removal on each individual pass made. The up-feed of the work

spindle is also automatic and continues to operate in such a manner until the

pre-determined amount of stock has been entirely ground from the teeth. Finish

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ing or sparking out passes are also provided for on an automatic basis. The machine grinds either right hand or left hand cutters

change permits the grinding of either tungsten carbide tipped, high speed steel, solid tungsten carbide, stellite or other similar type blades. The grinding wheel spindle is mechanically operated. All other functions of the machine are hydraulic.

The hydraulic system is extremely simple and consequently a minimum

. A simple wheel

of maintenance will be required. The machine is primarily a single purpose unit designed for the grinding of face

mills therefore set-up will be found very simple and fast. Other types of cutting tools such as certain side mills, slotting cutters, etc., can be ground under

certain conditions

Page 5

INITIAL PREPARATION OF MACHINE

The machine should be located on a solid floor or similar type foundation to prevent any movement, locating.

Care should be taken to make certain that the machine is mounted in a

Do not use the ram for lifting purposes when moving or

level position. The machine should be thoroughly cleaned when received in your

• plant. Be careful to remove all coatings used during shipment to insure proper operation of the various moving parts. All loose parts should be mounted in

position at this time. Please refer to the lubrication or oiling chart shown as figure 22 on page 46. All spindles, bearings and ways should be oiled. (The grinding wheel spindle

bearing is sealed for life and will not require attention.) Use a good grade

of machine oil. We recommend Indoil #31 (SAE 20) S.S.U.300 viscosity at 100° F. Fill the oil supply for the hydraulic, system with the same grade of oil. NOTE: We do not use an hydraulic oil in the machine. The hydraulic reservoir

can be reached through the side door shown as "Q" in figure #1, page 2. The capacity of the hydraulic system is 11.5 gallons. It will take approximately

11 gallons to fill the main reservoir and another two quarts to fill the various lines throughout the machine. A sight feed oiler will be found at the top of

the machine toward the forward end of the ram. This should also be filled with the same grade of machine oil used elsewhere on the grinder. This oiler will supply lubrication to the upper surface of the cam. Only a minute supply is

required and we would suggest that the adjustment on the oiler be set for a drop

about every ten or fifteen minutes

The oil is supplied to the top of the cam through a vertical orifice which con tains a conventional pipe cleaner for filtering purposes. IMPORTANT: This filter should be changed every six months

. It may be removed with a pair of tweezers by removing the square headed pipe plug found on the top of the ram near the automatic dresser stop. When the pipe plug is removed the ram should be moved at a slow rate of speed until the opening containing the filter or pipe cleaner appears. The new filter should be cut to an overall length of 5-3/4".

The work spindle is supported by a wooden block during time of shipment. Remove the large side panel found on the side of the pedestal. This is shown as "C"

in figure #2, page 30. Raise the work spindle by using hand wheel "M", figure #1, to free the wooden support block from the load created by the weight of the work spindle. Remove the wooden block through the side opening and replace the large side panel. The work spindle may now be raised and lowered as desired.

A dust collector nozzle assembly is packed separately for use with this machine. The unit consists of a sheet metal nozzle, a steel support that clamps on top of the wheel guard and a mounting rod. The steel mounting rod is to be fastened to the sheet metal nozzle. A collar and locking screw will be found on the nozzle

for this purpose. The other end of the mounting rod should be fastened to the clamp which fits over the grinding wheel guard. This is done by means of the

threaded hole and a lock nut. The entire assembly is then clamped in place over the wheel guard. It may be moved to either side depending on whether you are grinding a right hand or left hand cutting face mill.

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Page 6

The upper part of this nozzle shall be hooked up to the master dust collection system in your plant by means of an intermediate flexible connection. This is necessary because of the movement of the ram. Preferably the connection shall be made of rubber or soft plastic to allow freedom of movement. Flexible metal tubing is too rigid.

ELECTRICALS

The basic electrical system consists of a motor mounted at the rear of the ram

to drive the grinding wheel spindle and a second motor found inside the pedestal to furnish power for the hydraulic system. A micro-limit switch will be found

at the side of the grinding wheel carriage and is shown as "CC" in figure #1.

It serves as protection against the possibility of using larger diameter grind ing wheels in the higher RFM range which can be selected from the two spindle

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speeds that are available.

A special magnetic type starting panel will be found at the back of the machine.

The panel includes one reversing starter, one non-reversing starter, the fused disconnect, and a dual voltage transformer. A separately mounted push button

station will be found at the side of the face mill grinder (shown as "R" in

figure #l) for control purposes. The electricals which we have listed are

subject to change.

Check the wiring of the motors for correct direction of rotation. The lower motor controlling the hydraulic pump will only function properly in one direc tion. The motor for the hydraulic system as viewed through door "Q" in figure #1 should operate in a clockwise direction. If the large side cover on the opposite side of the pedestal is removed, the hydraulic pump unit will be in view. The pump has an arrow on the top of the casting showing the proper

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rotation.

A simple test to determine whether or not the hydraulic system is now function



ing properly is to turn control valve "T", figure #1, slowly to the right.

This control actuates the large cylinder which in turn will raise the front

end of the ram. If the ram fails to lift, it is an indication that the hydraulic

motor is running in the wrong direction. A change should be made in the wiring

if this condition is found. A change in the lead wires will usually correct this.

While the ram is raised, remove the wooden block from the cam holder and then

install the hardened and ground steel cam which was supplied with the machine. The cam is supplied with a locking screw at one side which works in conjunction with a taper pin to remove any end play after being tightened in the cam holder.

Place a block or some other object on top of the cam and then lower the ram to

make certain the cam is all the way down. Now tighten the locking screw.

Be certain to add a film of oil to the top surface of the cam for the initial

operation if the sight feed oiler has not yet commenced to function,

also be advisable to add a supply of oil to the cam well.

This will serve as a

It would

seal against abrasive matter when the lip on the lower side of the ram sets itself in the oil during the operating period.

Page 7

NOTE: Before starting either motor he certain that crank lever "A" in figure #1 is turned to the left to its limit. This moves the grinding wheel spindle up ward and prevents the possibility of the grinding wheel running into a cutter tooth or any other interference and breaking the grinding wheel. Another simple

check can be made to determine whether or not the motor controlling the hydraulic system is rotating in the proper direction.

The handle "Y", shown in figure #1,

actuates the horizontal reciprocation of the ram. The further the handle is

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moved toward the front of the machine the faster the ram should reciprocate.

The upper motor controls the grinding wheel and is operated by a reversing

starter to permit rotation in either direction.

At this point it is well to

check whether or not the grinding wheel is in rotation. If the grinding wheel is not in motion the difficulty may exist in the fact that the wheel is in the larger diameter range and the dual speed grinding wheel spindle is set for the

higher RFM. A speed changer shaft will be found at the back of the machine on the back side of the guard shown as "V" in figure 1, page 2. Slide the shaft

; .

to the opposite position and push the forward or reverse starting button once

again and the grinding wheel should be in rotation.

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HYDRAULIC SYSTEM

The hydraulic system in the machine operates at a pressure of approximately 15>0 pounds. The pressure is set at the factory and no further adjustment is needed. In the event it becomes desirable at a later date to check the pressure

a plate will be found on top of the ram, indicating the plug that can be re moved in order to insert a pressure guage. A diagram of the hydraulic system will be found in the appendix of this booklet. NOTE:

use

SAE 20 Indoil #31 machine oil S.S.U. 300 viscosity at 100° F or any other

equivalent machine oil.

Do not use hydraulic oil in the reservoir. The filler

spout can be reached quite easily through the door shown as "Q

As previously mentioned,

M in figure 1,

page 2. The entire hydraulic reservoir can be examined by removing the large



side panel found on the opposite side of the machine.

CONTROLS AND ADJUSTMENTS

The following is a list of the various controls and adjustments the operator

should be familiar with to aid in setting up and operating the machine. Desig nations are shown in figure #1, page 2.

"A" is the hank crank for raising the grinding wheel spindle when insta

lli

ng a new grinding wheel. It also becomes advantageous to use this method to raise the grinding wheel spindle when changing from one cam to another to eliminate

any possibility of running the grinding wheel into the diamond.

MBM is the lock for control "A" when automatic dressing is required. If this

lock is not tight the automatic dressing device will not function.

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Page 8

"C" is the adjustment which controls the rate of abrasive removal from the grinding wheel during the automatic dressing cycle. A screw type adjustment permits heavier dressing when heavier cuts are being taken or when wider carbide inserts are encountered.

"D" is a locking knob which secures the dust collector nozzle assembly in the proper position. When grinding the opposite hand cutter the knob can be loosen ed to permit the movement of the dust collector nozzle to the opposite side of



the wheel guard for greater efficiency.

"E" is the setting gage for determining proper face clearance.

"F" is the setting gage bar for indicating the proper position of the tooth to be ground. This bar is complete with an elongated slot to permit movement in a vertical direction. The bottom of the finger should be placed in a plane approximately horizontally equal to the bottom of the grinding wheel. This insures a uniform clearance setting regardless of grinding wheel diameter.

"G" is the diamond used for automatic dressing and remains in a fixed position

during the grinding operation. This diamond is of the sliver type. Do not use a cluster type or large diameter diamond.

"H" is a typical finger assembly. A fixed or stationary finger set-up is used. The point of contact of the finger to the tooth being ground should be as close to the high point on the face of the cutter as is possible in order to secure minimum runout

. The finger can be transferred to the mounting bar on the

opposite side of the face plate when grinding cutters of the opposite hand.

"I" indicates the method of fastening the cutter to the face plate,

In addition

to the center bolt hole, various bolt circles are supplied. We recommend the use

of four bolts for fastening as shown in the illustration whenever possible.

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M is a micrometer type adjustment which controls the rate of stock removal

per individual pass as each revolution of the cutter is made.

M indicates the locking knobs which fasten the cover plate in position to conceal the change gears. The change gears serve a two-fold purpose. They not only act as master index selector but also govern the rotation of the automatic indexing. An instruction plate is affixed to the front of the cover plate.

"L" is the knob which locks the automatic feed with the elevating screw of the

work spindle to control the total stock removal.

"M" is the hand wheel which controls the vertical movement of the work spindle on which the cutter is mounted. When grinding a larger or thicker face mill

the work spindle should be moved down. When grinding a smaller or thinner face mill the work spindle will ultimately have to be moved upward. A graduated

dial will be found immediately behind this hand wheel. This dial is set to govern total stock removal before locking knob "L" is clamped in position.

Page 9

nNM is a needle valve control that adjusts the speed at which the cutter tooth comes to rest against the stationary finger. Always make certain the tooth is

in contact with the finger before the grinding wheel touches the cutter.

0" is the fine indexing control to produce greater or lesser cutter rotation for indexing purposes. This unit produces a fine index adjustment after the change gears in area "K" at the front of the work spindle have been properly

■

positioned. The adjustment is only made when the number of teeth under consideration varies

The diameter of the face mill does not influence this adjustment.

from the number of teeth found on the previously ground cutter.

"P" is the hand wheel which controls the horizontal movement of the ram or top

part of the machine. When larger diameter cutters are to be ground the ram is moved toward the rear of the pedestal. If a smaller face mill is to be ground the ram is moved forward. This hand wheel coupled with hand wheel "M", which

controls the vertical movement of the work spindle, takes care of the position

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ing of the face mills.

"Q" is an access door and is used primarily for adding oil to the hydraulic

reservoir

"R" is the push button station shown in a normal position. This station operates

in conjunction with a special starting panel which is located on the rear of the

machine

"Forward"

"Reverse" and "Stop" positions are provided for the grinding

, wheel spindle. This allows the rotation of the grinding wheel in either direction to take care of both right and left hand cutting face mills.

"Stop" control button system is also provided for the hydraulic system. One of

the positions will also be complete with a red signal light. When this signal

"Start" and

is illuminated it will indicate the completion of the grinding cycle.

"S" is the setting dial or counting unit which is set in accordance with the

number of teeth or blades found on the face mill to be ground. This unit controls the timing of the automatic upfeed.

"T" is the control valve for the unit which hydraulically raises the front end

of the ram to permit the changing of cams

"U" indicates the two manual locks which are used to secure the ram in a fixed

position after the set-up has been completed.

"V" is the belt guard which covers a two speed driving pulley arrangement. At

the lower back side of this belt guard a speed changing device will be found.

When the knob is in the "out" position the slow speed is engaged for use with

large diameter grinding wheels. When the knob is pushed to the "in" position the spindle speed increases so that smaller diameter grinding wheels will operate more efficiently. The spindle speed change should be made when the grinding wheel is approximately 7-1/2" in diameter. A limit switch, "CC" in

Figure #1, prevents the operation of a large size grinding wheel at the higher RIM for safety purposes.

"w" is the adjustable dog for controlling the length of the forward stroke of

the ram.

Page 10

"X" is the ram reversing lever.

"Y" is the operating lever for starting, stopping and controlling the speed of reciprocation of the grinding wheel and ram unit. The rate of reciprocation is infinitely variable.

"Z" is the control valve and knob assembly for slowing the speed of the ram as the grinding wheel passes over the fixed diamond on the two automatic finishing or sparking out revolutions which the work spindle makes after the roughing passes have been completed. The speed differential is variable by means of this

control valve. The slow down is completely automatic once the adjustment has

been made.

"AA" is an operating lever which permits the automatic dressing of the grinding wheel. It is advisable to disengage this lever during set-up since the grind



ing wheel is not being used.

"BB" is the manual control for moving the slide to which the grinding wheel spindle is affixed. This control is only operative when lock "B" is tightened.

The adjustment is very fine

. If any great movement is required lock "B" should

be loosened and hand crank "A" can then be used.

"CC" is the micro-limit switch that prevents the operation of large diameter grinding wheels at the higher of the two available speeds

Please refer to figure #2, page 30, which shows a view of the opposite side of the Oliver Model 624, Automatic Face Mill Grinder.

"A" is the adjusting screw for moving the knee or work spindle to either side of center. This makes it possible to vary the clearance on the periphery or

lead angle in contrast to that which is ground on the face of the blades or

cutter teeth.

"B" is a graduated area which indicates the difference in the relative operating position of the work spindle and the grinding wheel spindle in order to obtain the correct clearance on the periphery or lead angle.

"C" is a side panel which may be removed for maintenance purposes. SETTING UP THE MACHINE NOTE: Before attempting to grind a face mill we suggest the operators familiar

ize themselves with the machine by starting the grinder, operating and learning the functions of the various levers and adjustments.

In selecting a face mill for the initial grind we would suggest the use of a high speed steel cutter if one is available. Our reason for suggesting that the tungsten carbide tipped cutters be tried a little later is because of the ten

dency of a new operator to run the machine a bit cautiously.

slower ram speed

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leads to a greater degree of heat generation and consequently to the possibility

of cracking.

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Page 11

The standard cam sent with the machine will grind both finishing and roughing

cutters satisfactorily thus eliminating the need for special cams for average work

stock or by grinding the bottom of one end of the cam.

in a subsequent paragraph.

It may be necessary to alter the level or tilt of the cam by using shim

This will be discussed

The reciprocating head should be run at full length of stroke for five or ten minutes at the maximum rate of speed. This vail be approximately twenty strokes per

minute. This will then work out any air that might have accumulated in the hydraulic lines during time of shipment. This same procedure should also be followed if the machine has not been run for two or three days.

JUMP OR UNEVEN MOTION IN GRINDING HEAD

If at any time the grinding wheel and reciprocating ram unit seem to operate with an uneven or jumpy movement it is probably because of an accumulation of air in the reciprocating head or hydraulic lines. Once again, we would recommend operating the ram at full speed for about five or ten minutes. We would also suggest turning valve ”

T", figure # 1, which will raise the front end of the ram.

The cam follower will not be in contact with the cam but this will not do harm.

MOUNTING THE CUTTER

Mount the face mill on the work spindle. It is assumed that the back of the

cutter has been checked to make certain that there are not any burrs, nicks or any other raised areas that would contribute to a poor contact with the face plate and thus create additional runout. If the cutter has a flat back it can be bolted directly to the work spindle face plate by using the proper pilot bushing. If the cutter is approximately 8" in diameter or smaller it will

probably be necessary to first bolt the riser which is supplied with the machine

to the face plate and then fasten the cutter to the top of the riser.

If the face mill has a recessed back, special mounting procedures must be followed. The face plate on the machine is manufactured to a diameter of

8-23/32”, which is equivalent to a #60 National Standard Face Mill Drive. Face mills having a recessed back of this size can be mounted directly over the face plate.

A riser is supplied with the grinder and it has an outside diameter of 5“l/l6”. This is equal to a #50 National Standard Face Mill Drive. If your cutter has a

recessed back of this diameter, first bolt the riser to the face plate and then

mount the cutter on the riser. If any other diameter recess is encountered, a

special riser will be needed. We manufacture adaptors on a special basis if

required.

Bolt the cutter to the face plate on the work spindle in the same manner that it is bolted to the milling machine if at all possible. This method eliminates some of the runout normally encountered since you are using the same mounting

area and applying the same basic tension. IMPORTANT: When bolting the cutter

to the face plate do not apply excessive torque to the work spindle. A series

of holes will be found in the periphery of the face plate where a bar can be

placed for assistance when reefing on the bolts while tightening.

Page 12

LIP REST OR FINGER PIACEMENT

The correct placement of the finger or lip rest is probably one of the most

important items to be considered when grinding a face mill.

If a left hand

cutter is mounted on the face plate the lip rest assembly will be positioned approximately as shown in figure #1. If a right hand cutter is to be ground the lip rest assembly will be mounted on the opposite side of the face mill.

The large lip rest bracket mounting bars can also be moved if unusually large

diameter cutters are to be ground. We utilize a stationary finger against the face of the tooth. IMPORTANT: The

point of contact between the finger and the tooth should be as close as possible

to the location of the high point on the top or face of the tooth. This is usually near the juncture of the face and the lead angle or periphery. By placing the finger in this position the runout is kept to an absolute minimum.

CUTTER SET-UP

As an example, we will consider the set4up when sharpening a 12" diameter 1 hairki^utter having 22 teeth. The face lip to be ground with 5° clearance

cutterSlso has a 45° lead angle on whict the clearance is to be slighb2y

greater orrabout 8°.

First, we set the work spindle in proper ^position to obtain the^added clearance

required on the l^&d angle. On a left hajid face mill added g£earance is obtain

ed for the lead angleNay moving the work holding spindle tp^the left of the

S£B INSERT ON N£Xr



machine. In order to movethe knee or work spindle si<tetfays it will be necessary

to loosen the four large bolts found on tne front apron or knee

Turn adjusting screw "A" in figures^2 untjl the at "B" in figure #2 shows about l/8"Ssbo movement of the wor ance on the cor

To set the face clearance, set gage

k spindle in the oppo

ner"arinie'ih'-cont-rast^to^

of the gage to the left. At thisy^oint e

gage finger "F", figure #1, to

point approximately\equa

the grinding wheel and lock iopposition w:

By using the two hand wheels, "M" and "P"

cutter tooth up to the

dnt at the lower

be made to line up the ^cutting edge of ti

tde 1

" i

figi

tend the\lower end of the sliding th the thumbscrew.

figure #1, brin

end of the gage,

tooth so that it wi;

with the wheel travel.

In order to movorthe cutter tooth into

in a neutral

"K", figure^

position. To do this, operi the cover plate held by thumb s

1, and disengage one of thg change gears. Now turn the cutter

until the/race of the tooth is directly member j

, figure #1, and make certain

oper place the work spindle

der the point of the sliding gage ^

Ithe tooth stays in this position while

completing the set-up.

jraduated "O" or "ZERO" found

of center. Conversely, any

LCtion-Jcd.il reduce the clear-

'ound on the face.

#1 by tipping the top part

1 to the lower edge of

the corner of the Nbs^attempt should

be parallel

it be

:ws

Page 13

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OLIVER INSTRUMENT COMPANY

These instructions supercede the n

CUTTER SET-UP" paragraphs found on the lower portion

of page 11 and the upper portion of page 12.

CUTTER SET-UP This machine is not limited to any particular cutter tooth shape. Cams can be made

for almost any tooth form desired,

automatically.

See page 2h for "Engineering Instructions For Layout of Cams For

Radii as well as various angles can be ground

Special Tooth Forms, !t We

will not attempt to give any particular cutter set-up because the conditions vary due to cutter diameter and clearance required. Therefore, these instructions will be general and the exact setting can be easily worked out by the operator and then charted

on pages

The first consideration is the positioning of the work spindle to obtain the proper clearance on the O.D. or the lead angle of the cutter. This is controlled by moving

the front apron or knee to the right or left.

and 55 of this book

The procedure is the same whether you are grinding a cutter with a U5° lead angle or a cutter having an 0,D. at approximately right angles to the face.

On the right hand side of the machine at "B", figure //2, page 30, the settings are indicated for right hand cutters. The settings for left hand cutters will be found on the opposite side of the machine in the same location* Be certain to determine

whether the cutter is right or left hand

left (in operation) when facing the cutter.

r (A right hand cutter will turn to the

)

We will now consider a right hand cutter. Looking at the right hand side of the machine ("B", figure #2, page 30) we see an "0" line on the front apron of the machine and an "0" line in the pedestal. To line up these two "0" marks loosen the four large

bolts which hold the front apron or knee and turn adjusting screw "A", figure 2, page

30. With these two "0" marks in line the work spindle is in the approximate position for

small face mills in the 6" to 7" diameter range requiring about 3° clearance on the face and 5° clearance on the lead angle or O.D. If the clearance is to be more than 5° or so on the O.D, then the work spindle should be moved so that the setting is at some graduation other than "0".

As you move the work spindle or knee to other settings farther away from the "0" mark you will increase the clearance on the lead angle or 0oD, only. This setting has no

bearing on the face clearance. On small cutters this movement is very sensitive.

One

graduation will increase the clearance 2 or 3 degrees.

To consider the setting for cutters in the middle range, say 12", lii" or 16" diameters the knee should be set at about the third or fourth graduation from the "0" mark to obtain about the same clearance on both the face and the 0. D. If the O.D. is to have

more clearance than the face, the knee should be moved farther away from the "0" mark.

Remembers The setting used on the front apron or knee will always be greater (further away from the "0" mark) as the cutter diameter increases or as more clearance is re



quired on the O.D.

Page 14

The second consideration concerns the matter of positioning the cutter to obtain the required face clearance. To set the face clearance, set gage "E", Fig, 1, page 2 by tipping the top part of the gage to the right for right hand face mills until the* graduation

corresponds with the clearance desired.

Next, move the sliding gage finger

* 9 Fig. 1, until the lower end of the finger is horizontally even with the O.D. of the grinding wheel, and lock in position with the thumb screw, IMPORTANT j By keeping the sliding gage finger "F" in a position approximately equal to wheel diameter when each set-up is made the clearance can be maintained fairly accurately even though the

grinding wheel diameter changes. Adjust gage finger on every set-up.

By using the two hand wheels, "M" and nPn tooth up to the point at the lower end of the gage finger "F". No attempt should be

made to line up the cutting edge of the tooth so that it is parallel with the wheel

, Fig. 1, bring the corner of the cutter

travel*

In order to move or rotate the face mill so that the cutter tooth will be in the proper

place under the gage finger the work spindle must be in a neutral position. To do this

open the cover plate held by thumb screws "K", Fig. 1, and disengage one of the change gears. Now turn the cutter until the face of the tooth is directly under the point of

the sliding gage member "F!r, Fig

n 1 and make certain the tooth stays in this position

while completing the set-up.

It is now necessary to position the lip rest assembly in such a manner as to make it possible for the stationary lip rest or finger to make contact against this tooth* The finger should make contact at approximately right angles to the cutter tooth to minimize deflection. As previously cautioned, the stationary finger or lip rest should be as close to the high point of the cutter tooth as possible,

Also, make certain the

finger is not in the path of the grinding wheel. Turn the setting gage finger "F", Fig

slot on the front of the grinding wheel guard to eliminate any possible interference, IMPORTANT : Lower the work spindle by turning hand wheel "M", Fig, 1, in order to get

c 1, out of the way and lock it in the alternate

the face mill below the regular path of the grinding wheel when the ram is in motion. The set-up described is actually very simple but MUST be done in sequence,

REMEMBER:

First

Set corner or 0,D, clearance. Second - Set face clearance* Third

After the face mill has been ground the clearance should be checked on both the 0*D.

Position the lip rest.

and the face. If the clearance is satisfactoiy then a permanent record of the settings

can be made for future duplication, The best method of checking clearance is to leave the cutter attached to the face plate of the grinder and check the drop in 1/16" (,001" drop in l/l6

,! is approximately 1°) with a dial indicator having a sharp point. Once again, the work spindle should be in a neutral position so the face mill can be rotated with ease to check the clearance*

After the face mills have been tested and proven satisfactory, a record should be made

of each set-up in order to maintain good results on subsequent grinds. The cutter set

 up record sheets found on pages 5U and 55 of this manual can be used. In any event, the information should be within convenient reach of the operator so that all future set-ups will be made in a minimum of time*

Page 15

is now necessary to position the lip

fe^it possible for the stationary lip Jest or finger to make contact against

ma.

this

cutter too

finger or lipN^st possible. Also, wheel

Turn the setting gage finder "F", figure #1, out of the

h. The finger should make contact at approximately right angles^o the

to minimize deflection. As previously cautioned, the stat^nary

should be as close to

,ke certain the finger is not in the path of thg^g

alternate slot on the frontsof the grind Lng wheel interference

. IMPORTANT

: LoVer the wor : spindle

figure #1, in order to get the rFace mill below th

wheel when the ram is in motion.

:st assembly in such a manner as to

the high point of the cutte:

ooth as

inding

The set-up described is very simple, b*

>T be done in proper sequence.

REMEMBER:

After the face mills be made of each s grinds of shim sto

back of the S' thi

. The r<

ng used for face clearance and t le stock removal rate per pass,

information is placed within conveni mt reach of the operator, all futur

rd should indicate the i

sed under the cam, if any, whether shim was placed at

cam, setting of the work spir lie to right or left and by how

First -^Set corn(

Second- Set face

Third - Position

r cleara&qe.

clearance

the lip rest.

ve been tested anc proven satisfactory^

-up in order to maintc Ln satisfactory

I number, the cam numbelN*

result

a record should

subsequent

the amount

*fkzont or

ch,

-ups will be made in a minimum of time

MOUNTING AND FORMING GRINDING WHEEIS

Turn the hand crank '’A", figure #1, to the left which will raise the grinding wheel spindle to the top limit.

Open the wheel guard and install a 10" diameter

by l/2" wide by l-l/2" hole grinding wheel. Any suitable standard straight

faced wheel can be used because the grinding wheel is dressed to the proper form

the machine.

The diamond is set at the factory and if it has not been removed it is in the proper position to dress the grinding wheel. If the diamond "G", figure #1, has been removed, it must be replaced in the diamond bracket so that the point is approximately

3/8

” to l/2" above the top of the bracket,

This is not a

critical dimension.

When the diamond is replaced be certain to use an economical sliver type.

The use of a large size diamond or a cluster type is not at all satisfactory

because the relationship between the cam shape and the final form ground on the

cutter Is lost because of improper dressing of the grinding wheel.

Page 16

At this point make certain that the operating handle "Y", figure #1, is at the

rear or "off" position. To form the wheel it is necessary to start both motors.

For left hand face mills the grinding wheel should run clockwise.

considering the grinding of right hand cutters we would rotate the grinding

If we are

wheel counter clockwise.

Please note the rotation of the grinding wheel on this machine is contrary to general cutter grinding procedure. This has been made possible because we do

not need the pressure or rotation of the grinding wheel to hold the tooth against the stationary finger during the grinding cycle. A special arrange ment in the hydraulic system holds the cutter tooth against the finger thus

allowing us to run the grinding wheel towards the tooth to give a much better



cutting edge. This is highly desirable when grinding carbide tipped face mills.

Open throttle lever "Y", figure #1, slightly until the ram makes about ten (10)

strokes per minute.

CAUTION: On the first forward stroke keep hand on the operating lever until you make certain that there will not be any interference with the diamond or cutter.

The next step is to feed the grinding wheel toward the diamond with hand crank "A", figure #1, while the ram reciprocates in order to dress the grinding wheel. The hand crank will not operate unless lock "B", figure #1, is loosened. Continue to dress the wheel until the diamond creates a form on the full periphery of the wheel.

If you have been unable to dress the grinding wheel because of lack of grinding wheel rotation, please check the two speed pulley arrangement found on the back side of the belt guard "V", figure #1. The large 10" diameter grinding wheel will not operate at the higher rate of speed and it may be necessary to pull the hand knob to the outer position in order to permit the operation of the grinding wheel motor.

Now that the dressing has been completed, stop the ram unit with the operating handle "Y", figure #1, and tighten the lock screw "B", figure #1, so that

subsequent dressing will be automatic. If the lock screw is not tight, the automatic dressing feature will not be operative. When completely dressed the grinding wheel will have a modified "vee" shape on the periphery. The form rill

vary in accordance with the cam used to obtain the final shape on

the face mill being ground.

AUTOMATIC SLOW DOWN FOR THE DRESSING OF GRINDING WHEEL ON FINISHING PASSES

In addition to automatically taking the roughing passes required to grind any

specific face mill, the Oliver Model 624 Automatic Face Mill Grinder also takes two (2) finishing or sparking out passes. It is highly desirable to have the grinding wheel dressed while the ram is operating at a speed which differs from the grinding speed on the sparking out passes

control valve ”

Z" shown in figure #1.

to make the necessary setting.

Normally, once the adjustment is made, the

The following steps should be taken

This is done by utilizing

setting is retained for all future use and no further care is needed.

Page 17

r:i

-t

■

Start both motors and have the ram reciprocating at full speed.

(1)

You will find two knurled knobs on control valve "Z", figure #1.

(2)

Loosen the lower knob since this also serves as a lock.

Place hand on top of the valve and depress as far as possible.

(3)

The valve will stay in this position. Turn the knurled knob until you can notice a difference in the ram speed

as the grinding wheel passes over the diamond as contrasted to the speed you will notice when the ram is in the outer or forward portion of the

stroke. It is only necessary to achieve a small difference in speed and we do not recommend slowing the ram speed down by a considerable amount. Once the desired speed has been obtained, turn the lower knurled knob until

(5)

the upper knob is locked in position. Turn off the hydraulic motor in order to get the hydraulic pressure down to

(6)

zero. This will permit the valve to raise itself

which in turn will return the ram speed to a uniform rate of movement for the roughing passes.

INDEX ADJUSTMENTS

the original position

There are no index plates required on this machine, nor are there any units to time. The cutter itself is the master index. At this point we would like you to refer once again to the change gears found at the lower front side of the

work spindle. These change gears serve two basic functions.

(1) They control the rotation of the work spindle in order to properly index

both right hand and left hand cutters

(2) They serve as a basic control to govern the indexing of cutters having

either a small number or great number of teeth. The basic indexing range is from 8 to JO teeth. If your requirements fall outside of this range contact us and we will advise you whether or not a special set of change gears can be supplied.

An instruction plate will be found on the cover of the change gear box. It

outlines the proper positioning of the change gears for various sets of con ditions • In order to obtain proper rotation, note the bottom gear must be

placed on the right hand side for right hand cutters and conversely, on the



left hand side for left hand cutters.

For master indexing purposes the small (32 teeth) gear should be placed on the

top if the cutter to be ground has from 8 teeth to 23 teeth. If the face mill being ground has 23 or more teeth, the larger (52 teeth) gear should then be placed on top. This gearing serves only as a rough adjustment and cutters

having approximately 22 teeth to 2k teeth can usually be run with the gears in either position.

During our earlier setup we had disengaged one of the gears so the work spindle would rotate freely by hand. The gears must now be positioned properly and

should also be engaged once again. Since we were considering a 22 tooth cutter the small gear should thus be on top. Also, since we were working with a left hand cutter the other gear should be placed at the lower left hand side. The

work

spindle can now be rotated since the correct finger location has been de termined and the finger is already locked in place. Close cover plate for the change gears.

Page 18

Now start the ram unit by opening the throttle lever "Y", fig. #1, until the rate of reciprocation is approximately ten or fifteen strokes per minute. Watch the cutter teeth and the lip rest or stationary finger. turning enough to catch the next tooth for indexing purposes turn knob "0% fig. //l, to the left or counter clock-wise. This will increase the index move ment. Generally, we like to have the cutter tooth index approximately l/8" to

If the face mill is not

 l/4" past the finger location before the automatic return takes over. If the cutter tooth travels too far then turn knob "0" to the right or clock

 wise to reduce the amount of index. Continue turning the knob until the desired amount of index is obtained. Before grinding the cutter it is well for the operator to experiment with this adjustment while the face mill is still below the grinding level in order to become more familiar with the amount of

located

index obtainable.

You will quickly find that it is possible to close the index valve so that the

cutter will not index at all from one tooth to another. This allows the operator to work on a single high tooth if needed. The upfeed in such a case would be made on a manual basis. You will also find that you can set the index for a skip-tooth or alternate tooth grind.

If for any reason your cutters have been

equipped with alternate dummy teeth the indexing would not be a problem.

The speed at which the cutter tooth returns to make contact with the stationary

finger is controlled by the needle valve "N", fig. #1. Turning the valve to the left or counter clock-wise increases the speed of the return. Turning the

valve to the right or clock-wise slows down the rate of return of the cutter

tooth to the finger. not return to the finger at all.

If the valve is completely closed the cutter tooth will

Be careful not to dose the valve to this extent.

This adjustment is very useful when grinding tungsten carbide tipped face mills.

If the tooth is allowed to return to the finger with a quick snap there is a possibility of cracking the carbide insert. Therefore, when grinding tungsten

carbide tipped cutters adjust the valve so that the cutter tooth comes to rest

against the finger with a minimum of shock. The major point to watch on this adjustment is to make certain the tooth comes to rest against the finger before

the grinding wheel makes contact with the lead angle or periphery on the outward stroke of the ram.

The machine is equipped with an hydraulic brake to overcome the inertia or coast

ing action developed at the time of index from one tooth to another. The opera tion of the hydraulic brake is completely automatic and does not require any setting or adjustment.

GRINDING THE CUTTER

At this point we assume the cutter has been bolted to the face plate, finger has been properly set to provide clearance, cam is in place, grinding wheel has been mounted and dressed and the index has been adjusted.

grind the first

cutter.

You are now ready to



Page 19

Make certain that handle "AA", fig. #1, is dropped into position in order that the automatic dressing arrangement will function,

As the grinding wheel passes

over the diamond on each stroke of the ram the amount of abrasive removed from

;

the grinding wheel will depend on the adjustment made with control "C", fig. //l.

Each graduation on this control represents a downfeed of .0001" for the grinding wheel

spindle assembly,

amount of dressing is decreased,

clockwise

; the amount of dressing is increased. We recommend setting this con

As the control is turned to the right or clockwise, the

If the control is turned to the left or counter

trol so that approximately .0003" of abrasive is removed as each ram stroke is

made



Be certain that the grinding wheel is being dressed at each stroke of the ram before grinding a cutter. If heavy stock removal from the face mill is main tained it may be necessary to increase the amount of dressing. If light cuts

are taken on the cutter or if the carbide area is small the rate of dressing



may be decreased. It may seem that the machine is using too much grinding wheel. Tests have shown

that since we are always working with a fresh and clean surface on the grinding

wheel we are able to remove more carbide and soft steel backing per inch of

grinding wheel diameter as opposed to the old method of grinding for a time and then dressing. Also, the top of the diamond acts as a fixed grinding line con tributing to reduced runout

. It is not necessary to compensate for wheel wear



since the automatic dressing device takes care of the matter.

Note the travel of the grinding wheel as it passes up and over the diamond. In other words, the grinding wheel .movement over the diamond and then over the cutter tooth.

, which is controlled by the cam, passes

To bring the cutter tooth into

the uath of the grinding wheel it is necessary to make use of the two hand wheels

"M" and "P", fig. #1.

The corner of the cutter tooth can be brought up into the grinding position by

carefully adjusting the cutter closer to the path of the grinding wheel as each

stroke of the ram is made.

The vertical positioning of the work spindle and the horizontal positioning of the ram should continue until a light grind is made on the surfaces to be ground.

If there are any high teeth on the cutter, care should be taken to make contact with these particular teeth first of all so that the grinding wheel will not be forced to take a heavy cut later on during the automatic indexing cycle.

have

only one or two high teeth it would be well to close the index valve "0",

If you

fig. ifl, so that the cutter will not index from one tooth to the next. Be cer tain to place the high tooth in the path of the grinding wheel and you will then find it possible to utilize dovm to the level of the others

the manual upfeed and bring this particular tooth

. After the high tooth level has been reduced you can then open up the index valve once again and proceed to grind all of the teeth would be well to consider the rotary or spin type grinding of the blades to a common level on other equipment. The face mills can then be transferred to

. NOTE

If you have a great number of new teeth in the cutter body it

Oliver automatic face mill grinders for economical finishing.



Page 20

The cams normally supplied with the Oliver automatic face mill grinder will

produce a small corner radius at the juncture of the face and the lead angle or peripheral grind. When changing face mills over to the Oliver type of grind for the first time there will he a tendency for the initial

contact

to be made at the outside corner before overall contact can be made. We will

discuss in a subsequent paragraph the proper procedure for changing the size of the corner radius or for eliminating it completely if found necessary.

The standard cams also produce a "Face Radius" and you will be able to prove this by placing a straight edge on the face of the teeth which have been

ground. You will find the surface slightly

curved and the back or inner edge

of the radius will also serve as the dish if the cam is properly positioned. The advantages of the face radius will be more fully explained in future paragraphs. The corner radius will add greatly to the number of pieces which the cutter can mill in your shop.

AUTOMATIC GRINDING CYCLE

Now that the initial contact has been made between the cutter teeth and the

grinding wheel you are ready to prepare the unit for full automatic opera

tion,

settings

It is not necessary to stop the motion of the wheel to make these

First, set the dial "S", figure #1, to correspond with the number of teeth

found on the face mill. This control feeds the work spindle upwards for



each additional pass required at the proper time. If the counter is set

for a 22 tooth cutter, the automatic upfeed will actually occur on about

the 24th tooth.

the upfeed does not occur on the same tooth every time,

This over-run is purposely built into the control so that

do so

would

soon cause a low tooth which could quite easily be detected when final run



out readings were made.

Second, set the micrometer type dial "J", figure #1, to control the actual

amount of the stock removal required per pass.

This setting is usually

made with prime consideration given to the width of the tungsten carbide

insert or the total width of the tooth in a high speed steel face mill.

If you are grinding a tungsten carbide tipped cutter with a green grit

;

silicon carbide grinding wheel it may be possible to remove anoroximaiely

.002

of stock per pass, if the carbide insert does not exceed l/8" in

width.

If the tungsten carbide insert is approximately 5/32" wide, the stock removal rate per pass should be set at about .001". If the tungsten carbide insert is approximately 3/16" wide, the dial should be set for

approximately .0005" of stock removal per pass. If the tungsten carbide is approximately 3/16" wide or greater, it may be necessary to use a diamond wheel to avoid cracking. A suggested design for the diamond wheel is shown on page 34.

Page 21

When grinding high speed steel cutters we would recommend setting the microme ter dial "J", figure $1, for a stock removal rate of approximately .002" per pass. The figures we have shown for both the high speed steel and tungsten



carbide tipped cutters are simply starting points. It may be necessary to make

adjustments in either direction.

Third, it is now necessary to make the setting to govern the total stock re moval required, a large ring dial. required to fully sharpen the face mill,

On the back side of hand wheel "M", figure #1, you will find

Set this dial for the estimated amount of stock removal

Next, tighten locking knob "L”, figure #1, and also engage a small ratchet which will be found at right angles to this locking knob near the center of the ring dial.

The small ratchet is

usually engaged a little easier if it is done before the locking knob is

tightened

The machine is now in full automatic operation,

When the grinding cycle has

been completed the signal light will appear on the push button station and the



machine will stop.

To briefly

(A) Y

(b) You have set

If the stock removal total had been set for .020" and the stock removal rate

per pass had been set for .002", the following cycle would take place,

machine would automatically take a total of ten (10) roughing passes of .002"

each to take care of the .020" total stock removal called for. will then take two (2) additional finishing or sparking out passes to pro duce a better finish and then the machine will shut itself

have set

describe the fully automatic operation, the cycle is as follows:

one one

dial for the

number

teeth found on the face mill.

dial for the rate of stock removal per pass.

1 off

The

machine

The



It might be that your initial estimate of the total stock removal required

to clean up the face mill is inaccurate,

If, while the machine is still taking the roughing passes, you find that the original setting will not clean up the cutter you can reset dial "M" behind the large hand wheel for a greater

amount of total stock removal once again without disturbing

the function of

the automatic cycling. It will be necessary to loosen locking knob "L" once

again in order to make the new adjustment.

The small ratchet must be engaged

once again and knob "L" retightened.

SHUT OFF PROCEDURE

IMPORTANT immediately.

the

machine or to the "off" position,

When the grinding cycle is completed the following should be done

(l) Move the operating handle "Y", fig. #1, toward the rear of

This will .prevent any inadvertant

move-

ment of the ram when the machine is started once again to grind another cutter.

(2) Be certain to loosen locking knob "L", fig. #1, and release the ratchet found near the bottom of this knob. If this is not done one of the clean up or finishing passes may be eliminated the next time a cutter is ground.

Page 22

In the event one of the clean up passes is eliminated the machine will

correct itself under the following circumstances

If the proper procedure is followed on the grinding of the next cutter the timing of the cycling unit will be such that the two clean up or finishing passes will be restored when grinding the subsequent face mill.

remove the face mill from the face plate and prepare for the grinding of the next cutter. It is always well to lower the work spindle at the com

You can now lower the work spindle,



pletion of each grinding job in order to eliminate any chance of interference

on the next set-up.

GRINDING OF SECONDARY ON CUTTER TOOTH

Because the machine uses the periphery of the grinding wheel to obtain

clearance it is sometimes necessary to reduce the height of the back side

of the teeth when they are excessively vide

. This is done in order to

eliminate any possible chance of drag caused by loss of clearance.

The grinding of such a secondary on the back side of the teeth requires only a simple change from the standard set-up.

This is accomplished very easily by loosening the four bolts holding the knee at the front of the machine and then moving the work spindle to one side or the other by using hand

crank "A", figure #2, page 30. the right about l/4" to 1/2". the left about l/V' to l/2u.

For a left hand cutter, move the knee to

For a right hand cutter, move the knee to

Start both motors and open the operating

handle so that the ram is reciprocating at full speed.

Even though you did not lower the cutter at the completion of the previous

initial

grind you will probably now find it necessary to elevate the work

spindle manually in order to have the face mill cutter teeth make contact

with the grinding wheel

. Continue to feed the cutter upwards after each

revolution in a manual manner until you are certain the back of the tooth

will not drag when performing the milling operation,

Generally, three or

four revolutions of the cutter along with the necessary upfeed of the work

spindle will suffice.

You will find that the margin width of the primary grind will not be con

stant in most instances. This is because of the various hook angles

which are encountered that place the face of the cutter teeth in a plane



that is not parallel with the line of travel of the grinding wheel.

This Is the only satisfactory method of grinding a secondary when a

stationary finger is used. If you were to attempt to line up the face of the tooth to a plane parallel with the grinding wheel travel you would destroy clearance, increase grinding time and lose the all-important

corner radius if you utilized

more than one grinding operation per cutter.

Page 23

The secondary can he ground either before or after the primary grind. If the secondary is to be ground first, it is necessary to make the standard set-up as previously explained and then move the knee sideways as described in this chapter. Again, it is not necessary or advisable to grind a secondary

;

■

unless the total width of the tooth is so great that the back side of the tooth is higher than the cutting edge. When very long length, high axial rake cutters are ground it may be necessary to move the knee over once again and grind a double secondary,

It may even be necessary to have this secondary grind extend into the leading or cutting edge of the peripheral or lead angle grinds in such cases.

GENERAL

;

Handle "X", figure #1, is the ram unit hydraulic reversing lever. This unit can be operated manually at any time thus reversing the stroke of the ram when in any position whether the machine is running or standing idle. This is a handy lever to use when dressing the grinding wheel, when changing cams or when a new grinding wheel is added. The grinding wheel can be moved

back and forth in short strokes across the diamond without wasting time waiting for the full length of stroke to be made

Stop "W", figure #1, is a dog which controls the forward stroke of the ram. This dog is adjustable and should be moved forward if you are grinding a cutter that has teeth with short overall lengths on the face. The stroke

should be just long enough to get the grinding wheel off the face in an area over the central cutter body. If the stroke were so short so as to make the grinding wheel pause on the tooth at the time of the reversing there would

be a good chance of cracking the tungsten carbide insert.

We have mentioned a dual speed grinding wheel spindle,

changing of the speeds will be found at the back of the machine on the back of the belt guard. A micro-limit switch prevents the operation of the larger

The control for the

diameter grinding wheels at the higher speed for obvious safety reasons. The control knob at the back of the machine must be pulled all the way out to produce the slow speed for the large diameter wheels

The machine can use grinding wheels from a maximum of 10" to a minimum of

5" in diameter.

V/hen the grinding wheel reaches a diameter of approximately 7" to 7-1/2" the control knob should be pushed all the way in to produce the higher REM on the grinding wheel spindle for the smaller diameter grinding

wheels. This will then give greater efficiency for stock removal.

REMEMBER:

slower of the two speeds

The larger diameter grinding wheels will only operate at the

The smaller diameter grinding wheels will operate

at either speed and it is therefore necessary to remember to make the change- over for best results

Do not attempt to make the speed change while the

grinding wheel spindle is in motion.

Page 24

The dust collector nozzle assembly is shown as "D", figure #2, page 30. This must be hooked up to your regular abrasive or dust collection system by means of an intermediate flexible connection,

of the movement of the ram. disturb the run-out.

Any degree of rigidity in the hook-up will

Preferably, the connection shall be made of soft rubber or soft plastic to allow freedom of movement, is too rigid. on top of the grinding wheel guard,

The nozzle is held in position by a steel strap and hand knob

When grinding cutters of the opposite

This is necessary because

Flexible metal tubing

hand simply loosen the knob and flip the nozzle assembly to the opposite side.

It is necessary to change cams when considering the grinding of a face mill

that has a tooth form entirely different from the previous cutter you have

ground. When a new cam is installed it is also necessary to redress the grinding wheel to a new shape

. Be certain that you have unlocked the grinding

wheel spindle carriage and that you have also raised the grinding wheel

slightly so there will not be any interference

makes the first

stroke forward on the newly installed cam. then be fed down to the diamond as previously described. film of oil to the surface of the new cam when first

with the diamond when the ram

The wheel can

Again, apply a

placed in the machine

in order to maintain long cam life.

INDEXING TROUBLE

The indexing is completely hydraulic and the machine operates on a low

pressure system of approximately 150 to l6o pounds pressure.

If you should happen to make an incorrect adjustment for indexing you will not cause any harm to the unit

not index at all or it may index quite irregularly, situations

exist, please make the following checks.

If the cutter does not index at all it would be well to check the lower

If the proper adjustments are not made the cutter may

If either of these

change gear in the box found at the lower front side of the work spindle. It may be that you are attempting to grind a left hand cutter while having the lower gear on the right hand side

If the lip rest is assembled on

the opposite side and the index is not reversed the indexing action will be quite irregular

If the cutter tooth does not return to rest against the finger after each index be sure to check valve "N" that by turning the valve to the left or counter-clockwise

, figure #1, and you will probably find

that the trouble

will be corrected.

’

FACE RADIUS" ON CUTTER TOOTH

In the following illustrations which we refer to, the drawings are made with

exaggerated angles and curves so they can be easily understood. The defi

 nition of "face radius" is that form or shape found on the face of the tooth. You will see that the face is not flat, rather,

large radius.

nor is it a series of flats but

Page 25

Figure #3, page 31, is a drawing showing a standard "face radius'

tooth form it produces,

This cam may be used for both roughing and finishing

1 cam and the

face mills by adjusting the cam in the machine.

Figure #4, page 31, illustrates the cam adjusted in the holder and the cutter tooth form it will now produce. near the corner.

This cutter can be used with very fine results for roughing

Note the high spot of the "face radius" is

work since the reduction of surface contact between the work piece being milled and the cutter will reduce chatter and vibration on heavy cuts.

Figure #5, page 31, illustrates the cam adjusted in the holder and the tooth

form it produces for finishing work.

Note the high spot of the "face radius"

is now located away from the corner and in toward the center of the cutter by a small amount. This means that the teeth now have the equivalent of a lead angle, flat face and dish except the "face radius" is much superior to a series of flats.

All actual line contact has been eliminated.

Since the surface contact has now been increased for the milling operation it must be remembered that this type of grind is suggested for finishing cutters where only light cuts will be taken.

If you wish to grind the face mill so that it will be satisfactory for both roughing and finishing combination cuts, the high point should then be shifted to an area between the high point generally used for roughing cuts

and the high point area that is usually used for finishing cuts. It would be well to experiment with different face grinds until a satisfactory obtained. the

set-up so the grind can be duplicated in the future.

As we have mentioned previously, a record should then be kept of

result is

By varying the thickness of the shim stock shown in figures //4 and #5* page 31*

the high point of the face radius can be located any distance from the corner. Varying this distance from the corner then provides the cutter tooth with more or less lead,

Do not have this high point inside the center of the face of

the tooth.

In using the above mentioned adjustment for the cam, the shim thickness will

vary as the cutter teeth hook and rake angles change,

If the cutter tooth

face angle is positive, the greater the angle, the thicker the shim will be

as shown in figure #5* page 31* If the positive angle is greater than ten

degrees (10°) the face radius surface on the cam should be ground with more curve which would be a smaller radius, checking the cutter tooth to find out how much hump or face radius there is

This can always be determined by

on the face of the tooth.

There is a simple method to check this high point, will reach across the face of the cutter,

Blue about 2" of the edge at one end and lay the straight edge across the cutter, is in line or parallel with the face of the tooth being checked, end of the straight edge will rest on a tooth across the cutter,

Use a straight edge that

Make sure the straight edge

The opposite

Rub the

straight edge either lengthwise or slightly sideways, keeping the straight edge

upon the cutting edge.

Page 26

The blue left on the face of the tooth at the cutting edge will show the loca

tion of the high point. By using a straight edge it will not be necessary to remove the cutter from the machine to check the face form. If additional stock is placed under the rear of the cam, care should be taken to make certain the grinding wheel comes in contact with the diamond once again. If you have used a large amount of shim stock under the rear of the cam it probably will be necessary to use the manual crank to feed the grinding wheel spindle downward instead of the fine feed knob since this would take considerable time.



If shim stock of any substantial amount is placed under the front end of the cam the grinding wheel should be raised enough to compensate for the height change which would otherwise cause heavy initial dressing.

The above mentioned method of shimming beneath the ends of the cams need be

done only during the trial grinding of the cutters

. After the cutter has beer- tested and proven satisfactory the lower surface of the cam may be ground, thus eliminating the need for the shim stock. You will find the bottom of the cam has a raised surface at each end. If you have found it necessary to use .030" of shim stock under one end of the cam you could then grind off .030" of metal from the raised portion of the opposite end of the cam to achieve the same results

Usually, one cam will take care of many face mills even though the diameter, number of teeth, length of grind or hand many vary. If you find it desirable to use the same cam for other cutters but are forced to use shim stock to maintain the proper high spot on the "face radius" a record should be kept. This makes future grinding set-ups very simple and rapid.

The grinding off of the bottom of the cams at one end or the other would undoubtedly result in the requirement of more cams. The time change involved is very slight and this practice is usually preferable to using shim stock because you have positive

control

GRINDING CUTTERS WITH LONG CORNER ANGIES

To grind a face mill having a long corner angle or a long length on the per



iphery might require a special cam. The standard cam supplied with the machine

will normally take care of a length of 2-1/4" .

In order to grind a longer length the high points on the dressing area of the cam and on the grinding area of the cam will have to be spaced further apart. countered in this direction please supply us with a sketch of the tooth form

you are going to grind. We will in turn supply you with a sketch of the pro

If any problems are en



posed cam and also submit a quotation for your consideration.

CAMS FOR SPECIAL TOOTH FORMS

The Oliver Model 624 automatic face mill grinder is capable of grinding many unusual forms as well as modifications of standard forms. Cams may be generated

to produce multiple angles, larger corner radii, combination lead angle and periphery grinds, etc. Once again, please supply us with a sketch showing the details of the tooth form you wish to produce. We will be pleased to supply a drawing and quotation for your perusal.

Page 27

ENGINEERING INSTRUCTIONS FOR IAYOUT OF CAMS FOR SPECIAL TOOTH FORMS First of all, we would like to emphasize that all cams, whether they are

purchased from Oliver Instrument Company or manufactured in your own tool room are subject to final correction after trial grinds have been made on the appro priate face mills. The many various axial and radial hook angles encountered

make such a correction necessary.

In addition, there is a basic variable geometric proportion that must be compensated for since calculations for this changing proportion cannot be made

in advance. The ram pivots on the large bearings at the rear of the upper part

of the machine. half way between the bearing support and the grinding area to think that we

In theory, the cam follower is at a position approximately

. This would lead one

could

plan the layout of the cam with a 2 to 1 ratio. This is the preliminary figure that we use. However, as the ram moves forward, the position of the cam follower also moves forward and the ratio changes

. There

fore, this also makes final cam correction necessary.

Most face mills are used primarily for metal removal functions and a difference of 2 or 3 degrees on the lead angle does not mean anything to the end product. The principal concern in making the final correction is to make certain the

high point is reasonably close to the final position desired. The work of generating a cam should be done on a drafting board where accurate

layout can be handled. For purposes of illustration we will consider the development of a cam to grind a cutter having a periphery of about 1-1/4" in length, a 45° lead angle of l/2

M length and a face about 3/4" in length. The

other considerations are the fact that the face must have a dish to reduce work

pressure and also it will be very desirable to add a corner radius at the

juncture of the various angles. The corner radii will increase cutter life.

The diagrammatic outline of such a tooth form will be found in figure y/-6, page

32, for your consideration. While such a tooth shape might not meet with any

of your blue prints you will find it quite easy to develop other shapes by

following through with this example.

We suggest that you draw up this form as described herein before attempting to

develop a cam for any other tooth form. After follo^/ing these instructions

step by step with this tooth form you can then make experimental layouts with other shapes. If you encounter any difficulties, send us a print or sketch of the cutter tooth as mounted in the cutter blank and we will lay out the cam.

Draw the cutter tooth form in very lightly at the same angle it is when mounted

on the machine. If you will refer to figure #6, page 32, you will find such an outline on the lower right hand corner of the sample drawing the cutter has been drawn at a 45° angle to equal the mounting position as

. You will note

found on the machine.

As mentioned previously, the cutter tooth form consists of the O.D. or periphery,

the 4p° lead angle, the face, the dish and the intermediate radii.

The cutter

as drawn is approximately 8" in diameter but this does not influence the genera

tion of the cam. The line A-A represents the center line of the work spindle.

Page 28

Since the face mill is mounted at a 45° angle the lead angle which we have previously described is now in a horizontal position. Now project two (2) vertical lines (B and C) toward the upper area as a start in laying out the

cam. The outside corner of the tooth form or, in this case, the center of the lead angle will control the basic locating dimensions. We have shown the height of the earn as 2-3/l6" but this figure can actually be anything from 1-1/2" to 2-1/2".

The intermediate point between lines B and C will be the theoretical high point of the working or grinding portion of the cam. If you will look at the cam that came with the machine you will note there are two distinct high points

. The smaller high point section controls the dressing of the grinding wheel to the appropriate shape. The theoretical high point of the grinding end of the cam between B and C is shown by line J.

Draw a line in a vertical position 3-7/8" to the left of line J to locate the high point of the dressing area of the cam. This is shown as line K in the drawing on figure #6, page 32. Now draw another line in a vertical position 5/8" to the left of line H. This line will represent the left end of the cam. You can now draw another line 6-1/2" to the right in a vertical position which will now locate the other end of the cam for you. You should now have a working area that will measure 2-3/lo" in height and 6-1/2" in width and it vail be in the proper relative position to the cutter tooth form which you have outlined in the drawing below.

Vie have not attempted to show an end view of the cam, however an examination of the sample cam shipped with the machine vail show it to be l-7/l6" in

width. The tolerance for this dimension should be plus .050" and minus .000". You vail note in the drawing that we have a hole shown equidistant from the

two ends and l/2" from the bottom of the cam. We use a 3/8" reamed hole as a locating device to enable us to grind the radius found on each end of the

cam. Note that the two ends actually represent a portion of a 6.498" diameter circle. The tolerance for this grind is plus .000" and minus .003".

At the left hand side of the drawing you will find a 5/16" x 16 tapped hole

for an Allen set screw. This is located 13/16" from the left end of the cam

and also at a height of l/2".

designed to take up any end play in the cam. The dotted lines in this area

This Allen lock screw contacts a cam lock plug

show a 3/8" reamed hole drilled in the very end of the cam. This hole, which holds the cam lock plug, is also l/2" from the bottom of the cam and is drilled in the center of the cam when viewed from the end. The cam lock plug is available from Oliver

The angles found on the dressing portion of the cam have a definite relation

ship to the angles found on the grinding portion of the cam. They are not

identical, however, and we increase the angles on the dressing portion by about 1° to create a slightly sharper peak. This is done so that the entire grinding wheel does not make contact as it is desirable to use the line

contact method of grinding rather than the area contact set-up.



Page 29

The top front surface of the cam (upper right hand area in drawing) controls the grind on the face of the cutter. This is the surface where we add the face radius which we have mentioned earlier. For layout purposes disregard

the face radius at the moment. We have found that the equivalent angle in this case would be approximately 28° from horizontal. Therefore, from point J on the upper surface of the cam draw a line to point F at an angle of 28°.

The 45° lead angle falls between lines B and C on your layout, of the cam draw a horizontal line l/2" long,

If the projection of line J were

At the top

made it would bisect this portion of the cam on your drawing.

I I

The area that falls between lines B and E on the cam governs the grinding of the periphery of the cutter. Generally speaking, the angles which you incor porate in the layout of the cam are about three or four degrees greater than one-ha If the angle found on the drawing of the cutter tooth itself at the

lower portion of the drawing. The angle shown on the periphery is 45° from horizontal in the initial layout which you have made. The angle on the cam would therefore be 22-l/2° plus the three or four degree figure we have just mentioned. Thus, draw a line at 26° from horizontal starting at point J and working to the left and down.

We have already established the location of the high point of the dressing area as 5/8" in from the left hand side of the cam. This is line H. The peak of this high point should be 1-1/2

M from the bottom area of the cam. This dimension should be maintained with the tolerance of plus or minus l/8" even though the high point of the grinding area may vary considerably in

height

We have already mentioned that the angles on the dressing portion of the cam

should be about one degree (l°) greater than those incorporated in the

grinding area of the cam.

Therefore, from point H at the top of the cam

on the left hand side, draw a line to the right and downward at an angle of

29°. to the left and downward at an angle of 27°.

Starting at point H once again on the top of the cam also draw a line

You have now roughed in the



outline of the dressing portion of the cam.

The 29° angle to the right of point H and the 26° angle to the left of point

J will intersect. incorporate a radius or blend at this area, we have shown a striking point for a 3/4" radius,

However, for purposes of smooth ram travel, we wish to

You will note at point G that

This point can only be found by trial and error since difference in height and difference in angles will vary the location,

This is not a critical dimension but the blend

should be as smooth as possible.

You will also note that we have undercut the bottom of the cam to a depth of 1/32".

This leaves two legs or mounting areas for the cam to rest on

during the grinding cycle when it is locked in position in the cam holder.

As mentioned previously, the lower surface of the cam can be ground off at

either end in order to eliminate the use of shim stock for obtaining a correctly positioned high point on certain cutters

Page 30

We have stated that the upper right hand portion of the cam (from line C

to point F) controls the grind on the face of the cutter,

This is the

area where the face radius is incorporated. If you wished to generate a

straight line grind on the face and then a slight angle for the dish at the inside of the tooth it could he drawn out by following the method we have just described. The angle you have generated for this particular portion of the cam will need final correcting.

This is due to the various

hook angles encountered on the cutter teeth and is also affected by the fact

that the ram has projected to a great distance from the pivot point, thus

changing the height/length ratio.

The face radius has proved to be much superior since it eliminates all line contact and improves the surface finish on the material being milled.

We have found that the best location for the center of the face radius is

slightly to the right of the juncture of the face and the corner angle. If you will look at point C on the top of the cam you will see that we have drawn a line 1/8" to the right at 90° to the surface of the cam. We then extend this line to a point equal in length to the radius required.

The normal radius used on Oliver cams is variable and ranges from 60" to

100" under standard conditions.

We normally use a 60" radius for roughing

cutters, an 80" radius for combination roughing and finishing cutters and

a 100" radius for finishing cutters. Sometimes it is necessary to go down

to a 40" radius on the face for roughing cutters since certain hook or rake angles will tend to flatten the radius thus increasing work pressure and causing chatter

The grinding of the face radius can be done with a very simple holder fastened to a long shank or piece of bar stock.

If a 60" radius is desired

the shank should be at least 60" long thus making it possible to pivot the

holder and shank from a point 60" back from the front of the cam. The radius

can then be ground on the face of the cam by pivoting the cam against the

face of a large cup wheel on any type of grinder that might be available. If a longer grind must be obtained for the periphery then can be generated

by the standard cam then the high point of the grinding area must be moved

to the right. You will see immediately that this action would reduce the

available length for the grinding of the face.

If the high point of the grinding area is moved to the right it will give the machine more time to index the cutter from one tooth to the next but it will also lengthen the stroke thus requiring a little

more grinding time.

You will note that we did not provide a flat area on the top of the high point for the dressing area equivalent to the flat we added on the other

point to produce the 45° corner or lead angle. If the length of flat is about l/2" in length or shorter the wheel will generate the form without any difficulty. If you happen to have a tooth form where the corner angle

is quite lengthy then it would be necessary to add a very small flat on

the dressing portion in order to come up with the proper grinding action.

Page 31

The corner of the cutter can be ground with a sharp corner or almost any size

radius

The most important feature of this machine is the capability of grind-

ing a corner radius with no increase in time. A small corner radius of about

l/32" will take the place of the usual small 45° bevel and will make the cutter life considerably greater. This is because we have eliminated all projecting corner angles that usually break down because they cannot dissipate the heat

generated during the milling operation.

;

1 1

If you will refer to figure #7, page 33, you will find a drawing giving in structions on how to increase or decrease the size of the corner radius or



even produce a sharp corner.

The method of developing a cutter and cam combination as outlined above would

be ideal if the teeth were set in the cutter bodies perfectly straight and we could grind on the center line from zero degree clearance. As mentioned

previously, the axial and radial rake angles, the clearances and the variable position of the ram make the layout only fairly close. Therefore, trial grinds

must be made and then you can start to make the necessary compensations for any irregularities that entered into the picture. We recommend the use of a good grade of tool steel when manufacturing these cams. They should Rockwell from 60 to 62 on the "C" Scale.

CORNER RADIUS

We have touched on this subject rather lightly in previous paragraphs. All of the standard cams supplied by Oliver will produce a small radius at the juncture of the lead angle or peripheral grind and the face. This is probably

the most important part of the Oliver grind. The addition of the corner radius does not increase the grinding time one bit yet it contributes very substantially to the life of the cutter. Under normal operating conditions your milling cutters should produce many more milled pieces per grind.

’

The addition of the corner radius eliminates all sharp projecting corner angles. These corner angles are usually the first part of the face mill to

break down and this is because there is not enough mass of metal in this small area to dissipate the heat generated during the milling operations radius tends to distribute the heat evenly. If a sharp corner is definitely necessary it can be produced by following the instructions shown in figure 7,

. The corner

page 33* These instructions also show you how to make minor variations in the size of the corner radius .

MISCELIANY

The cam follower which rides back and forth over the top surface of the cam is

supplied as a cylindrical tungsten carbide insert brazed into position so that a radius actually makes contact with the cam. If after a period of time this area shows considerable wear and has developed a flat spot a gradual change in

tooth form or shape will take place. We would recommend that the brazed insert

be removed and then rotated to another position and brazed in firmly once again.

Page 32

Be sure that the insert is brazed in the holder in a level manner so that contact is made across the entire width of the cam.

The

diamond used for automatically dressing the grinding wheel on the machine is an economical silver type. Do not use a cluster type mount or a single diamond having a large diameter under any circumstances

. The larger diamond area produces a totally different shape on the grinding wheel than intended and consequently the tooth form is not ground as actually required.

Most face mills approximately 8" to 9" in diameter can be bolted directly to

the face plate and this is the method recommended in every case where it is possible to do so. Cutters from this size range down to the minimum capacity will in all probability have to be mounted on the riser that was supplied with the machine. If this is not done you will be unable to elevate the small

cutters to a height great enough to make contact with the grinding wheel.

NEVER use any intermediate risers unless absolutely necessary since this will

contribute to increased run-out.

In some instances you will wish to grind face mills having a great number of teeth in relationship to the diameter of the cutter. This creates a close or find pitch condition and the distance from the face of one tooth to the face of the next tooth is very small. In these cases you may not be able to in

 corporate the full amount of clearance required without giving some considera tion to the size of the grinding wheel. About the only recourse available to you on close pitch cutters would be to make certain that you use a smaller diameter grinding wheel so you do not touch the cutting edge of the adjoining tooth during the grinding operation.

When placing the stationary lip rest or finger against the cutter tooth at

the time of set-up careful attention should be given to the positioning used. V/herever possible, place the finger at right angles to the cutter tooth. This does not give the finger any opportunity for deflection and thus reduces the chance for increased run-out. Also, make sure the finger is as close to the high point as possible and try to avoid contact with the previous tooth while the grinding is taking place.



If your cutters have heavy sections of tungsten carbide inserts or if you are grinding solid tungsten carbide blades it may be necessary to go to a diamond wheel similar to that shown in figure 8, page 3^-* It will be necessary to purchase a special diamond wheel mount for use with these wheels

Page 33

| :

’

FIGURE

■l

Page 34

Page 35

'■

;

}

Page 36

HOW RADIUS

TO MAKE CORNEA "C" ON THE CUTTER TOOTH A

SMALLER RADIUS, INCREASE THE RADIUS ON THE CORNER

RADIUS "A" ON THE TOP OE THE CAM CAN INCREASED TO THE POINT WHERE IT WILL GRIND

A SHARP CORNER ON THE CUTTER TOOTH.

TO MAKE CORNER "C" ON THE CUTTER TOOTH A LARGER RADIUS

CORNER OR RIDGE AT "B" ON THE CAM.

CONTROL

"C"

OR RIDGE AT "A" ON THE CAM.

INCREASE THE RADIUS ON THE

SIZE OE CORNER

CUTTER

TOOTH.

FIG - 7

A HA

Page 37

Page 38

•J

■

Page 39

15 .

— I BORE

Vi6

‘ STROKE

i/B ROO DIA

MS LBS FORCE

-------

gjg

mech

____

! j

TIMER

A|3

1 12

. J !2

1-1/2' BORE I" STROKC

220 LBS FORCE

MECH.

T IMER

D-,

J-

5/8

“ BORC

. :

1/4 STROKE 46 LBS FORCE

MECH.

TIMER

-1-1/4 BORE

—

MECH.

2-1/2" STROKE 184 LBS FORCE

WIRE TO

MOTOR

i-S

® r

BORE

2-1/2' STROKE

11 B LBS FORCE

[

201 !

r -

I )il l

301

0X?

i gm

iixk

SET ISO PSI

: i

1-1/2 HP

1200 P.P M

©K3

I MECH

HY D.

[

-»

.0)

8 GPM

--------

[

T^n

rxl—

II GALLON RESERVOIR

-r

I MECH. |

- 2-1/2" BORE 4 STROKE 0/4 ROD DIA. 7J5 LBS FORCE

1*1/2 BORE 5/16 STROKE 3/6 ROO 265 LBS. FORCE

1-1/4" BORE 1/4 STROKE 164 LBS FORCE

/(S

3-1/2' BORE 1-1/2' STROKE

14 40 LBS. FORCE

A 23

SEQUENCE OF OPERATION

‘ WALL

MCCH

Tl ME R

r~i

V- 104 - 0

A — MOUNT CUTTER ON MACHINE. B - OPERATOR STARTS MOTOR PRESSURIZING

COMPLETE HYDRAULIC CIRCUIT.

C - OPERATOR SLOWLY OPENS VALVE 2 TO

START MACHINE IN OPERATION.

D ~ PISTON 5 MOVES AND MECHANICALLY

ACTUATES ACTUATES VALVE 4 WHICH CAUSES PISTON TO REVERSE. THIS REVERSING ACTION CAUSES PISTON 5 TO RECIPROCATE.

E - PISTON 5 ALSO MECHANICALLY ACTUATES

VALVE Z2 WHICH HYDRAULICALLY ACTUATES VALVE 6 MAKING PISTONS

RECIPROCATE.

F - EACH ACTUATION OF VALVE 6 MAKES

PISTON 9 RECIPROCATE. CONTINUED RECIPROCATIONS AGAINST MECHANICAL TIMER

10 ACTUATES VALVE II.

G - EACH ACTUATION OF VALVE II MAKES PISTON 12 RECIPROCATE.

CONTINUED RECIPROCATIONS AGAINST MECHANICAL TIMER 13

ACTUATES

H — EACH ACTUATION OF VALVE 14 MAKES PISTON 15 RECIPROCATE.

CONTINUED RECIPROCATIONS AGAINST MECHANICAL TIMER 16 ACTUATES LIMIT SWITCH STOPPING MOTOR.

I - THE FIRST RECIPROCATION OF PISTON 15 ACTUATES VALVE 17.

VALVE 17 CAUSES PISTON 18 TO CLOSE AND ACTUATES VALVE 19 WHICH CAUSES PISTON 5 TO SLOW UP DURING WHEEL

DRESSING PORTION OF THE STROKE. PISTON 18 REMAINS CLOSED UNTIL MACHINE SHUTS OFF.

J - WHEN PISTON 8 IS AT THE END OF THE STROKE IT OPENS

VALVE 20 WHICH CAUSES PISTON 21 TO ACTUATE BRAKE ON CUTTER HOLDING SPINDLE.

K - OPERATOR OPENS VALVE 23 WHICH ACTUATES PISTON 24 TO

LIFT GRINDING HEAD FOR CHANGING CAMS.

VALVE 3. VALVE 3 HYDRAULICALLY

VALVE 14.

AND 8

5/18" OD.

5/8" O

3/4" 0.0

HYDRAULIC

STEEL TUBING .03 5' WALL

STEEL TUBING 03 5

5TECL TUBING 04 9' WALL

LINES

(l) VICKERS PUMP

ALL OTHER HYDRAULIC COMPONENTS

MADE BY OLIVER INSTRUMENT CO.

THESE TIMERS ARE MADE BY THE OLIVER INSTRUMENT COMPANY.

HYDRAULIC CIRCUIT FOR OLIVER MODEL 624 AUTOMATIC FACE MILL GRINDERS

FIG. 10

Page 40

-J

Page 41

:■

9408

9409

9 398

9415

CWI THRUST 0CARINC

ffl

&-J

9403

9404

— 9396

9390 9397

r 9410

9411

'-941

9432

9515

9 469

847

IT! r

9472

9409

94 14

9406

92 49

9 413

SECTION B-B

9353

9241

9 410

^9412

9 411

OARLOCK

l/2*X l"

9402

9 416

CHCVRON i

L 3/4 X

packing

c I 3/0'

^ZZ^gj

SECTION A- A

9407-. \

rr j

t-,

9406

“

RINGS

? x-fr"

*■ X f

3i X 3 -7

CARRIAGE &. RAM ASSEMBLY

624 H. A.F.M.G.

FIG.

9518

92 87

9285

Page 42

;

Page 43

Page 44

• V

—

Page 45

—

9247

1/4' . 3/8"

*0' RING

9248

924 4

9249

5/a’» 13/16'

O' RING

92 41--

9242

9236

9110

3/8 5TCEL BALL

9237

9249

6027

9115

9118

9235

9240

2 1/8' « 2 3/

'O' RING

’ RING

VALVE MOUNTING PLATE

SECTION AA

-g

9117-

l$E

F 16.17

9274—-

ASSEMBLY

tr =• -c

OARLOCK CHEVRON

PACKING 1/2' . |-

9113

9111

9114

Page 46

Page 47

9019

9012

r1^

1-1/2 H P. 1200 R PM

§ ©

9018

9016

-9017

9011

V-104 -D

®T

aol

]

9013

901^

9015

9020

-—9022

9025

9023 —

9010

)r—9020

9024

FILTER

OIL

\‘7ZZ/7Z///Z/ZZ/////

TANK

''///////

ASSEMBLY

/.'/'■'///////7::jr7r'/’ • ' J

FIG. 20

2 *

Page 48

;

Page 49

<y>

®k

@L 1 ^

□UCT

Lu jnj rn

OIL LEVEL

fi F? IT

;

M§)

NOTE 100° F, OR EQUIVALENT FOR BOTH HYDRAULICS AND

@ OIL DAILY.

- USE INDOIL NO. 31 MACHINE OIL, CS.A.E. 20) S.S.U. 300 VISCOSITY AT

(§) REPLENISH TO PROPER LEVEL WHEN NEEDED.

FIG.

LUBRICATION.

• V .*

Page 50

PARTS LIST

for

MODEL 624 AUTOMATIC FACE MILL GRINDER

IMPORTANT:

9000 9001 9002

9003 9004

9005 9006 9010- 9011-

9012 9013-A 9014

9015

9016 9017

9018 9019

9020 9021-A

9022 9023 9030

9031 9032

9033 9034

9035 9036

9037 9038

9039 9040

9041

9042 9043

9044

90^5

9046

9047

9048

9049

Pedestal Pedestal side plate Pedestal side plate spacer (8) Pedestal door Pedestal door hinge pin (2) Door knob Door latch

Oil tank

Oil tank cover Oil tank clamps (3) Oil pump & filter Relief Valve Relief valve piston Relief valve spring Relief valve adjusting screw

End plate

End plate plug End plate Relief valve waste pipe Supply coupling Waste coupling

Index case Index unit shaft Index unit shaft key Index front plate (2) Index back plate (2) Index plate hub (2) Index plate hub B (2)

Index gear segment (2) Rivets & spacer dowels (12) Index plate spacer Index ratchet plate (2) Index pawl ( Index pawl (Short) Index pawl stud (8) Index pawl spring (4) Index pawl release pin (8)

Index plate retainer

Index pawl release plate (2)

Index piston 8s rack

Index piston extension

Furnish machine serial number when ordering repair parts.

9050

9051 9052

9053

9054 9055

9056

9057

9058

9059

support

9060

9061 9062 9063

906^ 9065

9066 9067

9068 9069 9070

9071

9072

9073

907U

9075

9076

9077

9078

9079

9080 9086

Long

)

9087 9088 9089 9090

9091

9092 9093

9094

9095

Index return piston & rack Index release plate stop pin Index outer bearing mounting Index shaft bearing retainer

Index cylinder, R.H. half

Index cylinder, L.H. half Return cylinder, R.H. half Return cylinder, L.H. half

Cylinder end plate, R.H.

Spring retainer

Cylinder end plate, L.H.

Brake control valve

Valve seat bracket Valve plunger Valve plunger tip

Check valve seat

Check valve ball retainer

Piston stop Piston stop washer Index adjusting screw

Brake valve collar Adjusting nut spring Adjusting screw extension Adjusting screw knob Adjusting bracket Adjusting cover plate

Index case cover

Index support bracket

Index pipe coupling

Index shaft coupling body (2) Index shaft coupling spider

Stop unit base

Index cylinder Stop piston Index cylinder end plate Stop star Stop star bracket Stop ratchet

Stop ratchet pawl Stop ratchet plunger Stop ratchet plunger spring

(2)

Page 51

9096

9097

9098

9099

9100 9101 9102

9103

9110 9111 9112

9113

91114.

9115

9116

9117

9118

9120 9121 9122 9123

9124

9125

■

9126

9127

9129

9130

9131

9132

9133 9134

9135

9l4o

9l4l 9142

9lb3

9144

9145

9lb6

91V7 9148

9149 9150

9151

9152 9153 915^

Ratchet pawl stud Ratchet stud

Pawl washer

F&wl extension Spring post limit switch riser (4) Stop unit end plate Stop unit cover

Valve mounting plate Control valve Control valve extension

Adjusting screw

Packing gland

Ram lifter

valve tearing

End plate Ram lifter

lacking gland

control valve

Cross slide Cross slide feed screw nut

Cross slide feed screw Feed screw collar End plate Spindle vertical carriage Spindle tearing slide Slide extension Slide plate

Vertical carriage git Slide retainer, R.H.

Slide retainer, L.H. Elevating screw Elevating screw gear Elevating nut

Elevating screw plug Reversing gear case Work spindle index shaft

Lower change gear shaft

Upper change gear shaft

Work spindle pinion shaft

Bevel pinion spacer Work spindle tevel pinion Work spindle drive gear (4) Reversing gear case spider Change gear Change gear Change gear Change gear Oil Baffle plate

Baffle plate spacer (3)

9155 9156

9157

9158

9159

9160 9161 9165

9166

9167

9168 9169 9170

9171

9172

9173 917^ 9175

9176

9177

9178

9179

9180 9181 9182 91839128 9185 9186

9187

9188

9189

9190 9191

9192 9193

9194 9195

9196 9197

9198 9199

9200 9201 9202 9203 9204

9205 9206

Clamp screw (2) Clamp screw stop pin (2) Clamp screw knot (2) Clamp screw knot pin (2)

Reversing gear case door

Thrust stud Change gear shaft key

Work spindle tearing

Bearing extension Work spindle Face plate Face plate pilot Work spindle shield Work spindle dust seal Brake drum Brake shoe (2) Brake shoe retainer Brake lining (2) Hydraulic hrake spring (2) Spring hanger (2) Brake cylinder piston (2) Brake piston contact (2) Brake cylinder connector Work spindle collar Work spindle tevel gear Work spindle tearing plate Elevating shaft tearing Bearing extension

Feed unit cylinder

Elevating shaft

Elevating pinion Elevating shaft collar

Spring retainer //1 (2) Spring retainer jt=2. Spring retainer (4)

Feed ratchet Feed ratchet front plate Feed ratchet tack plate Feed pawl #1 Feed pawl #2 Feed pawl spiring Feed pawl stud (2) Feed piston Feed piston adjusting screw Adjusting screw nut Adjusting screw knot Feed cylinder end plate #1 Feed cylinder end plate #2

Page 52

9207 9208

9209 9210

9211

9212 9213

9214 9215

9216 9217

9218 9219

9220 9221 9222

9223 9224

9225 9226

9227 9228

9230

9231

9232

9233 9235

9236 9237

9238 9239

9240 9241 9242 9243 9244

9245 9246 9247

9248

9249 9260 9261 9262 9263 9264

9265 9266

Feed dial brake Feed dial brake spring Feed cylinder cap Feed cylinder cap seal

Packing Retainer

Feed shut-off Feed shut-off valve Feed shut-off Feed shut-off Feed dial

valve seat valve spring

valve cap

Feed dial front dust seal Feed dial rear dust seal Elevating shaft ratchet —

Elevating shaft ratchet latch

latch dust seal

latch dust seal retainer Ratchet latch spring (2) Ratchet latch knob Ratchet latch knob finger Feed dial cap

Dial clamp

Dial clamp screw Feed hand wheel

Elevating pinion washer

Elevating pinion nut

Elevating hand wheel nut (2)

Timer cylinder

Feed timer valve

Timing valve lushing

Cylinder end plate Cylinder end plate cap Clutch roller gear (2) Spring plunger (8) Plunger spring (8) Cylinder end plate R.H. Cylinder end plate L.H. Feed timer piston Feed timer adjusting stop Adjusting stop collar Timing unit adjusting knob Clutch Roller (8) Ram carriage slide Ram carriage Ram carriage end plate Ram carriage gib Ram carriage gib screw (3) Ram carriage gib lock screw (2) 9314

Ram carriage feed screw

9267

9268

9269

9270

9271

9272

9273

9274

9275

9276

9277

9278

9279

9280

9281 9282 9283

9284

9285 9286

92&J

9288 9290

9291 9292

9293 9294

9295 92 96

9297

9298 9299

9300 9301

9302

9393 9304

9305 9306

9307 9308

9309 9310

9311 9312

9313 9315

Feed screw stop

Ram feed screw nut bearing Feed screw nut Feed screw nut collar

Ram carriage traverse gear Ram carriage traverse shaft Thrust bearing collar Hand wheel shaft bearing Traverse hand wheel

Cam support bracket Cam support bracket side plate R.H. Cam support bracket side plate L.H.

Cam support

Cam support side plate R.H.

Cam support side plate L.H, Cam lock plug

Cam lock screw Diamond bracket, R.H. Diamond holder Diamond bracket, L.H. Diamond bracket extension (2)

Diamond holder washer (4) Ram base

Ram base shaft Ram bearing end plate (2)

Ram ball bearing shaft Ball bearing retainer (2) Ball bearing adjusting screw

Ram lifter cylinder Ram lifter cap Ram lifter piston Ram lifter

piston end

Ram lifter piston retainer

Ram housing stud (8) Ram R.H. side plate Ram L.H. side plate

Ram

Ram cap

Ram cap cover Ram cap bushing Ram dust seal #1 (4)

Ram dust seal plate (4) Ram dust seal #2 (4) Ram dust seal plate #2 (4)

Index control valve plate Index control valve Index control valve retainer

Index valve control

■

: :

■

Page 53

9319 9320

9321 9322

9323 9324

9325 9326

9327 9328

9329 9330

9331 9332

9333 9334

9335 9336

9337

9338

9339

9340 9341

9342 9343

9344

9345 9346

9347-A

9348 9349-A 9350

9351 9352

9353 9354

9355

9356

9357

9358

9359

9360 9361

9362

9363

9364 9365

9366

Operating cylinder back plate Ram operating cylinder Ram operating cylinder base R.H. side plate L.H. side plate

Piston Piston shaft Cylinder head (front)

Cylinder head (rear) Piston rod packing gland

Operating cylinder plug Reversing valve bushing (2) Reversing valve spool Rev. valve end plugs (2) Rev. valve end plate

Rev. valve seat Reversing valve

Rev. valve gate packing gland (2) 9402

Reversing lever

Reversing lever roller Reversing lever roller stud Reversing rod Stationary reversing block

Movable reversing block Reversing block clamp bolt Reversing block stop

Index valve sleeve (ends)

Index valve sleeve (center) Index Valve Plunger Index valve plug

Index valve cylinder cap Throttling valve Throttling valve seat Throttling valve retainer Throttling valve lever hub Operating cylinder stud Piston shaft sleeve

Reversing rod support Index valve bushing

Operating lever Index valve sleeve #3 Slow

valve piston

Piston stop pin

Slow up valve plunger Plunger lock nut Plunger knob

Slow up valve cap Slow up valve spring

9407 9408 9409 9410 9411

9412 9413

9414 9415

9416

9420

9421 9422 9423

9424 9425

9426

9427

9428 9429 9430

9432 9433

9434

9435 9436

9385 9386

9387

9388 9389

9390 9391

9392 9393 9394 9395

9396 9397

9398 9399

9400 9401

9403 9404 91+05 94o6

Bust seal clamp Front ram dust cover Bust seal clamp Ram front plate Grinding wheel carriage slide Grinding wheel carriage Grinding wheel carriage gib

Bust shield Bust shield stop Bust seal Felt retainer Spindle carriage feed screw nut Grinding wheel feed nut bushing Grinding wheel feed screw Gr.wheel spindle carriage spring 2 Carriage spring guide (2) Gr. wheel carriage end plate Gr. wheel carriage cartridge

Feed screw crank adaptor

Carriage feed screw lock

Gr. wheel feed worm Gr. wheel feed cylinder Gr. wheel feed cylinder bushing Feed timing valve Gr. wheel feed piston Gr. wheel feed piston extension Gr. wheel feed piston ext. end Gr. wheel feed adjuster Gr. wheel feed cylinder end plate #1 Gr. wheel feed cylinder end plate 7/-2 Gr. wheel feed cylinder cap

Feed ratchet knob

Gr. wheel spindle bearing

Gr. wheel spindle Spring retainer Spindle spring washer Spindle bearing dust seal Spindle rear dust seal Gr. wheel spindle nut spacer Spindle bearing end plate

Spindle bearing end plate seal Wheel mount Wheel clamp Wheel guard cover Whee

1 guard cover pin (2) Gr. wheel Universal Joint Gr. wheel drive U-Joint

Univ. shaft bushing-large

Page 54

9437 9438

9439 9440

9441 9442

9443 9444

9445 91+46 9447 9448

9449 9450

9451

9452 9453

9454

9455

9456

9457

9458

9459

9460 9461

9462 9^63

9464

9465

9466 9467

9468 9469 9470

9471 9472

9473 9475

9476 9477

9478

9479 9480

9481 9482

9483 9484 9485

Univ. shaft center bushing Univ. shaft keyway bushing Universal shaft key (2) Universal shaft sleeve Universal shaft

Shear pin sleeve (2)

Gr. wheel feed plunger spring Feed plunger bracket Feed safety bracket

Feed

plunger bracket stud Feed plunger Feed plunger extension Feed plunger pin

Rear dust seal clamp Rear dust cover Rear dust seal clamp Motor bracket & ram end plate

Grinding wheel drive shaft

Bearing retainer #1

Bearing spacer jfl Bearing spacer #2 Bearing retainer -#2 Dive key Dive key shaft Dive key shaft extension ft

Dive key shaft extension #2

Dive key shaft extension knob Drive shaft pulley #1 Drive shaft pulley 7/2

Pulley bearing retainer

9486 Pipe coupling block

9487 Pipe dust seal 9489 Cutter adaptor #1 9490 Riser & hollow back adaptor 9491 Riser stud (2) 9492 Riser pilot sleeve 9493 Spindle pilot sleeve 9494 Cutter adaptor

9495 Cutter spindle bolt 9496 Cutter spindle bolt washer 9497 Small cutter clamp bolt 9498 Small cutter clamp bolt washer 9500 lip rest shaft bearing (2)

9501 lip rest bracket bar (2) 9502 lip rest bracket 9503 lip rest bracket

9504 Long Stationary lip rest bracket stud 9505 Stationary lip rest bracket stud 9506 Auxiliary lip rest stud 9507 Lip rest 9508 lip rest holder

9510 Heavy duty lip rest holder 9511 Heavy duty lip rest 9512 Heavy duty lip rest bearing 9513 Heavy duty lip rest spring 9515 lip rest setting gage

9516 lip rest setting gage bar 9517 Setting gage clamp screw 9518 Setting gage bar clamp screw

9520 Lust collector support arm limit switch trip button sleeve 9521 Dust collector support arm limit switch trip button

Motor pulley Belt buard strap (2) Belt guard stud (2) Belt guard back Belt guard front

Pulley bushing (2) Pulley bushing key (2) limit switch trip bearing

Dive key pin Dive key plunger

Dive key plunger bushing limit switch trip plate Carriage dust shield retainer Carriage dust shield

Carriage wear plate Hose & tube connector (2)

9522 Dust collector stud 9523 Dust collector hood collar 9524 Dust coliector vent hood 9526 Cam follower

9527 Lock screw plug (5)

9530 Pipe nipple (2)

9531 Pipe nipple (4)

9532 Pipe nipple (2)

9534 Supply pipe

9535 Waste pipe

9537 Pump intake pipe 9538 Oil filter pipe 9539 Push button support (2)

9540 Index change gear Instinct ion plate 9541 Diamond wheel mount

9542 Diamond wheel clamp plate 9543 Motor pulley, l400 RBI

9544 Drive shaft pulley #2 9545 Drive shaft pulley #1

■

;

screw

Page 55

CB7 45° Corner angle cam

CB8 60° CB9 90°

Corner angle cam Corner angle cam

PURCHASED PARTS:

6 1 pr.

1 pr. 1 1 l

1 2 2

EW 3/4" Norma Hoffman thrust bearing

EW 1"

W 1

F 9

F 5

1 4 sets 1 set 2 sets

1 404IFG l/8" Remco check valve 1 85 3/4" Nibco swing check valve 2 80 1/2" Globe valve

1 EW 19237 Eris wheel cylinder 4 l/8 x 2-1/2" Piston ring 1 V-104D Vickers 2

802TC

1 CR-9440 Kig G.E. limit switch

1 set 4L500 1 L-095 3/4 x 7/8 Love joy coupling 1 CD-422 7/l6 x 1-3/4 Koebel diamond

1 10 x l/2 x 1-1/2" grinding wheel 1 A-15-7-50 Vimco light 1 #6 Williams crank handle 1 STB-416A 1/8 x 1/2 x 1" T.C.Blank

6205 Ball bearings S-12 R-P Norma Hoffmann bearings 2

205-H5D Barden bearings Fafnir bearings 2MM-204 W1 493 Timken cup )#3 497 Timken cone ) 52637 Timken cup )#3 52387 Timken cone)

522 Timken Cup ) 529 Timken Cone )

Nonna Hoffman thrust bearing

D.B.B. thrust bearing Aetna thrust bearings Aetna thrust bearings

63 x 216 Garlock oil seals 53 x 2327 Garlock oil seals 3862 J.Manville clipper seal

431 Garlock packing l/2 x 1" 431 Garlock packing 3/4 x 1-3/8" 431 garlock packing 1-3/4 x 2-3/8"

pump

Allen Bradley limit switch

vee

belts (4 belts)

-16

RR082- RR 122-66 3/4 x 28 long hose assembly

2 2

RR 031-11 3/16 x 28 "

RR 031-11 3/16 x 24 "

RR 031-11 3/16 x 32 "

RR 031-H 3/16 x 48 "

RR 031-H 3/16 x 12 "

7f68 x 2 Male connector

#69 x 2 Male elbow

10 50BTX-S Ihrker male connector 13 5FBTX-S Ihrker male elbow 2 10FBTX-S Parker male connector 2 12FBTX-S fhrker male connector

1 5GBTX-S Fhrker female connector 2 10GBTX-S Parker female connector 2 12GBTX-S Parker female connector 1 5RBTX-S Parker male run tee

2 #302 Git oilers 4 #303 Git oilers

2" Rd. x If" long T C Blank

l/2 x 28" long hose assembly

4 1204 Git oilers 1 1207 Git oilers

3 1902 Git oilers

1 -//208 Git oilers 2 3400 x 2 Weatherhead male elbow

1/8" P.T.

SERIAL NUMBER - This number will be found on the identification plate at the side of the machine, serial number will also be stamped on

The same

the machine itself at location "B" as shown in Figure 2, page 30.

Page 56

INDEX

Automatic Cycling Diagrams

Automatic Grinding Cycle Cams

..............................................................................

Cam Layout Clearance

...................................................................

...................................

.......................................

...

...........................

Corner Radius ...........................................................

Cross Section Drawings - Drive Shaft Assembly

Feed Unit Assembly • Finish Grind & Shut Off Unit Assembly

Grinding Wheel Spindle Assembly. • .

Hydraulic Diagram. ...............................

Index Case Assembly Oil Tank Assembly

Operating Cylinder Assembly. Ram Assembly Reversing Case Assembly

................

Valve Mounting Plate Assembly. . . .

Work Spindle Assembly...........................

Diamond Diamond Wheel Specifications. Dressing of Grinding Wheel. .

........................

... • • •

Dust Collector Nozzle Assembly Electricals Face Radius Finger or lip Rest Placement. • •

...............................

................

...

...................

Grinding Wheel Specifications . . Grinding Wheel Spindle

....................

Grinding Wheel Usage........................

High Points on Teeth Hollow or recessed Back Face Mills

........................

Hydraulic System and Diagram. . . Indexing

•••••••

....................

Installation Instructions ....

Lubrication .......................................

Motors

•• ...........................................

Mounting the Cutter ........................

Operating Instructions

Parts List

Ram Speed While Dressing

....................................................

................

...................

...

Secondary Grind ................................

Serial Number of Machine Set-Up Shut-Off Procedure

...................................................

............................

................

Spindle Speeds....................................

.............................................. 42, 43

............................................... 17, 18

5, 17, 21, 22, 23, 24, 31, 32, 33

............................................... 24, 32

............................................... 11, 29

............................................... 28, 33

......................................................

...............................

... • • • •

• • • •

............................

12, 13, 21

• 4, 5, 21

. 21, 22, 31 . . . 11, 12

. . . 34, 35 . . . 20, 39

................

. 21, 22, 31

................

. . 4, 6, 36 . 14, 15, 21

47 thru 52

9, 11, 12

43 43

36 4l 44

• 45 38

. 40 . 42

12, 29

5, 6

13 19

52 18

Page 57

CUTTER

NUMBER

CAM

NUMBER

SET - UP

CAM SHIMMED

AT FRONT

CAM SHIMMED

AT REAR

R ECORD

SETTING F-OR

WORK SPINDLE

SETTING FOR

FACE CLEARANCE

Page 58

CUTTER

SET-UP

RECORD

CUTTER

NUMBER

CAM

UMBER

CAM SHIMMED

AT FRONT

CAM SHIMMED

AT REAR

SETTING WORK SPINDLE

FOR

SETTING FOR

FACE CLEARANCE

Page 59

ADDENDUM

For machines hearing serial number AC-530 or later.

:■ .

ii: !

;

On the operating side of the work holding spindle you will find a manually operated work spindle lock. This lock has been added to prevent any undue stress or strain on the working parts of the index mechanism when tightening or loosening the cutter holding bolts.

When it is time to fasten the cutter to the face plate or to demount the

cutter simply turn the knurled knob which controls the locking of the work spindle. The lock will drop into place by means of spring pressure and eliminate any torque that would normally be applied to the index mechanism.

To unlock the work spindle so that the machine will operate in the proper manner pull the knurled knob outward and then turn in either direction so that the lock is disengaged.

i •

, ■

Page 60

V <£*1

fiiS

OLIVER of

DRILL GRINDERS

Model 600 floor

type

PRODUCTS

ADRIAN

..........

to 3"

capacity

:• ;

’

•};

Oliver type points

i-**'

I ■

Heavy duty 21 bench type

. .3/32" to V2" capacity

Oliver type drill point

€

Standard 21 bench type

. . 3/32" to V2 " capacity

Conventional type point

DRILL POINT THINNER

Floor type

. 5/ 16" to 3" capacity

Thins and correct webs

■:P

DRILL CHECKING GAGE < Bench model

TOOL BIT GRINDER

Floor model

..........

Template controlled for consistent grinds

.................

.. . V2 " to 3" capacity

Checks accuracy apcj clearance

up to IV2 " wide by l3A ".high capacity

’

• MS

■1

■u

• m

. I

FACE MILL GRINDERS

Model 624—Completely automatic Manually operated grinder

. . . . :

TOOL and CUTTER GRINDERS

Floor type . .'.............

For general purpose resharpening of carbide

. ........

..........

6" to

24" capacity

4" to 24" capacity

and high-speed tools and circular saws

DIE MAKING MACHINES

' 1 • ’

Floor type—six speeds.

; I > . • •. J ’

• ' • ' *

; • i. *

Bench type—direct or dual speedy

{

! •

. . . . For materials up to 3" thick

* .

.For materials up to 1" thick

' -i ■

]

1 7:

• -•

•f