Oliver Instrument Model 510 Drill Pointer - Manual Grinder

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Page 1

DIRECTIONS

FOR

OPERATING

OLIVER

510 DRILL POINTER

OLIVER INSTRUMENT CO.

ADRIAN, MICHIGAN, U. S. A.

June, 1956

Page 2

INDEX

Page

Introduction Greasing the Chuck. . Operating Instructions

Dress the Wheel . . .

To Grind a Drill

Parts List

To Change the Clearance ....

To Change the Chisel Point Angle Grinding 3 and 4 Lip Drills . . To Grind Drills off Center. . .

Do Not Start the Machine vith the

Wrench in the Chuck

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

Water Attachment

If Point Does Not Look Right.

2 3

4 5

5 7

12 12

13 13

Checking Drills .........................

Web Thickness of Drills . . . Dry Grinding

Coolants

16 16 16

Page 3

INTRODUCTION

Drills ground on an Oliver #510 Drill Pointer are chucked in

a two jaw self-centering chuck, which revolves while the drill is being ground and produces a special type of point, which requires less feeding pressure and less horse power for the same feed and speed as compared with other types of standard drill points.

There is less clearance at the outer edge but greater clear ance toward the center, producing a much stronger cutting edge and sufficient clearance for the heaviest feed possible for the drill to

take

These facts have been borne out by experience with over 3,000

machines in service and are obvious to any mechanic having had ex



perience with drills and drilling.

Drills can be ground with point angles from 82 to 160 de

grees included.

Chisel point angles from 90 to 140 degrees, also

the clearance can be varied.

With these adjustable features many



different kinds of points can be ground.

The Oliver point requires less chisel point angle than drills ground in any other manner. We do not depend upon this angle for the center clearance.



Drills ordinarily ground have 130 degree chisel point angle.

The Oliver Point works best at 110 degrees to 120 degrees and has much better clearance toward the center. at the factory

for 110 degree chisel point angle.

The machines are adjusted

Most drills as

ordinarily ground have 12 to 15 degree clearance angle. We do not determine the clearance on a drill In degrees, it is always the amount of drop from the cutting edge to the heel which remains the same the full

length of the cutting

edge.

IMPORTANT-OILING INSTRUCTIONS

Check the oil level in the glass gage on the right-hand side of the machine, if oil is low add some No. 40 or 50 machine oil by removing the cap (f) on top of the body.

so inspection may also be made while the machine is operating,

We furnish a plastic cap

Oil

should be flowing on the gears at all times.

Page 4

The hollow or greater clearance toward the center makes the

drill stronger because it allows the chisel point to cut its way in

to the metal.

drill should not be brought forcibly against the metal as it will

Due to this increased clearance toward the center, the

bury its point deeply and may chip off the chisel point.



Standard machines will grind 2, 3 and 4 lip drills.

2 and

4 lip drills are ground with the standard sub-jaws sent with the

machine

split

bushing.

Best results

are obtained by grinding 3 lip drills in a

The machine has been carefully designed and the workmanship

is equal to that of the best machine tools.

DESIRED, SEE TO IT THAT THE MACHINE RECEIVES PROPER CARE. MACHINE CLEAN ) . machine

Emery and dirt

allowed to accumulate will

SPINDLE PULLEY

IF THE BEST RESULTS ARE

(KEEP

ruin any

GREASING THE CHUCK

The chuck should receive

DRIVE

PULLEY

daily attention and be kept clear of emery

The wearing parts of the

. chuck are hardened steel and a greas ing system is built in which helps to

keep emery from the working surfaces.

On opposite sides of the chuck are Alemite fittings.

The gun should

be used daily and cup grease forced

-e

IDLEFt PULLEY

into all working parts,

working out between the rubbing sur

faces.

If this is attended to once

a day and only the surplus grease re

moved from the inside of the chuck,

the surplus

it will prevent emery working into the wearing surfaces.

the



MOTOR

PULLEY

Pig. 1

Diagram of belt installation

BELT

The motor on this grinder is

hinged to eliminate the necessity of

a belt tightener.

pulley revolves around the quill

As the spindle

center, the slack is taken from the

belt by the weight of the motor. A

1-3/4" endless fabricated belt is pro vided. damage in shipment, a support is

To protect the motor from

slipped over the belt guard stud and



Page 5

motor shaft to support the motor.

the machine is in place and you are ready to install belt,

Do not remove this support until

When in

stalling the belt, be sure to mount it with the proper side to pulley

and follow the design shown in the diagram, Fig. 1.

CENTER ASSEMBLY

The center assembly is taken off the chuck for shipping.

turned end of the square bar fits bearing, this bar has been fitted held in place with a taper pin.

into the bored hole in the chuck

and lined up at the factory and is

When assembling this into the chuck bearing, make sure the large end of the taper hole in the bar is up. The center and center bracket can then be put on in position.

OPERATING INSTRUCTIONS



The

No. 510 Drill Pointer

Capacity l/4"-3" drills.

Page 6

It is always well to check the machine over before starting

it for the first started.

time,

Too often machines are damaged when first

Check the oil level in the glass gage on the right

of the machine, if oil is low add some No. 40 or 50 machine oil by

hand side

removing the cap (F) on top of the body.

For 2 lip drills be sure the shifting knob (i) is clear into

its limit.

The Wheel dresser

away from in front

(see Fig. 2)

of the grinding wheel.

(h) and setting

gage (C) should be swung

The Chuck should be backed away from the grinding wheel, this

is done with hand wheel (E )

The Clutch operating lever (a) operates the drive to the

chuck, it is all right to operate this while the grinding wheel is running

running

but do not throw this clutch in or out while the machine is

Start the motor to see if the grinding wheel is running the

right direction-clockwise

facing the pulley end of the motor and Is

indicated by an arrow cast on the.wheel guard. Running the machine

backwards will cause damage to the mechanism. When running correct

ly, pull the starting lever (b) forward, toward the operator, the limit of its travel

drill

To stop, push the lever back away from the operator to the

limit of travel,

and leave in this position while grinding the

STOP AND START until

the function of this control

is understood.

DRESSING THE WHEEL



To obtain proper clearance requires a perfectly straight and

sharp face to the wheel, and a dresser (H)

With the starting

dresser

in front

lever (B) in stopped position, raise the wheel

the wheel and then advance the carriage until

the dresser engages with the face of the wheel.

back and forth

across the wheel until

the wheel is straight and

sharp. Dress the wheel often enough to keep it cutting

, Fig. 2, is provided.

Move the dresser

freely.

Turn the diamond occasionally to keep it sharp.

Do not round the inside corner of the grinding wheel by hand or any other method, as this destroys the drill point form and changes the chisel

point angle.

Page 7

TO GRIND A DRILL

Move

the point of the drill,

the chuck and clamp it in position at the angle desired

The drill point included angle reading

is at the lover rim or base of the chuck.

Disengage

the chuck clutch by turning handle (A) Fig.

the left to its limit.

Three sets of false jaws or hardened inserts are furnished

with the machine.

This allows the chuck to rotate freely.

The range of the false jaws are as follows:

2 to

Small vee is for drills from 1/4" to 5/8"

Medium vee is for drills from 5/8" to 1-5/8"

Large vee is for drills from 1-5/8" to 3"

It is very important that the correct pair of false jaws are

used and that they are well seated, when tightened into the master

jaws of the chuck.

Raise through the back of the chuck with the left hand until it nearly touches the setting gage.

will crowd the drills sideways or off center with the chuck.)

the setting gage (C) Fig. 2, and insert

(Do not touch the setting gage because it

the drill

Clamp

the drill by means of the chuck wrench, using care to have the drill

properly located in relation to the jaw so that (x) and (y) (see Fig.

3) are approximately equal distances from center.

This precaution will insure drills being held at four points on the lands. THIS IS VERY IMPORTANT.

Fig- 3

Correct wa.y to chuck drill

Page 8

4003A

4004 4007

4008 4010A 4012A

4013A 4014 4015B 4016A

4017 4018

4019 4020

4021A 4023

4024 4025 4026

4028 4029 4030 4031 4032

4033 4039

4040

4041 4042

4045 4046

4047

4051 4052

4053 405

4056 4057

4058

4059A

4060 4061 4062

4063 4064

4065

4066 4067

4072 4073

4074 4076

4077 4078

4079 4080

4083

Quill Quill end plate

Pulley Lock Spindle Nut

Spindle Pulley

Wheel Mount

Wheel Spindle

Quill Gear

Variable Cam

Cam Adjuster Adjuster Lock Sleeve Adjuster Lock

Adjuster Lock Spring Adjuster Pin

Adjuster Wrench

Pulley Spacer

Cam Shim Cam Thrust Plug Cam Thrust Sleeve Cam Thrust Spring Cam Thrust Screw

Cam Block

Body Cap

Thumb Screw Cam and Gear Rivet Cam Block Screw

Clutch Shaft Clutch and Gear Clutch Bolt Clutch Stop Pin Clutch Drive Gear

Clutch Lock Dive Key Dive Key Shaft Dive Key Pin

1*-

Dive Key Spring

Dive Key Plunger Plunger Bushing Shaft Extension

Shaft Knob 2- lip Change Gear 3

- lip Change Gear 4- lip Change Gear Change Gear Spacer

bearing spacer

2- lip idler gear

3- lip idler gear 4- lip idler gear Idler gear shaft Clutch Plate Clutch Body

Clutch Spring Clutch Spring shaft Clutch Shaft Clutch handle

Idler Shaft Pinion Oil Pipe

#510 PART

LIST

4085

4086

4087 4089 4091

4093 4095A

4096 4097

4098

4099 4100

4101

4102 4103

4104 4105B

4106 4107

4108 4109

4110A

4111 4112

4113A

4114 4115

4120

4121 4122

4123 4124

4125 4126

4127

4128 4131

4134

4135 4136

4137 4141 4142

4145

4146 4147

4148 4153

4154 4155

4156 4157

4160

4161 4162

4163 4164

Wedge Arm Bearing Wedge Arm

Wedge

Operating Shaft Lever Hub Wedge Arm Plate

Back Plate

Oil Pump Housing Oil Pump bushing

Drive Pinion

Pump Gear Drive shaft

Idler Gear Idler Gear Shaft

Chuck Drive Gear

Drive Gear Shaft

Drive Gear Plate Drive Pulley Dive Plug Dive Plug Screw

Dive Plug Spring Dive Shaft Bearing Bearing retainer

Oil Drain Plug Oil Seal retainer Drive Pulley Washer

Wheel Guard

Slide Feed Screw Nut

Screw Nut Lock Carriage Carriage Gib

Carriage End Plate Feed Screw

Feed Screw Washer Hand Wheel

Idler Gear Bushing

Wedge Latch

Latch Pin- Latch Spring Stud Latch Spring

Tie Plate Carriage Dust Seal

Setting Gage

Setting Gage Arm Setting Gage Shaft Setting Gage Lever

Wheel Dresser Stud

Wheel Dresser Arm Wheel Dresser Shaft

Lever Hub Lever Hub

Slide Support Slide Support

Idler Pulley Idler Bracket Idler Pulley Shaft

(dry)

(wet)

( dry

(wet)

)

Page 9

■

) O C

)

) § (

UNIVERSAL JOINTS & SHAFT

ASSEMBLY

DG-52

LOWER UNIVERSAL JOINT

ONLY

DG - 50

T_£

UPPER UNIVERSAL JOINT

ONLY

DG- 51

ggEASE in

4085

4091

4092

4001

4276

/a*lL

OIL SEALj^c^

4202-

4205'

6203 BRG5.

413 7-

4270

.4272

4275

277

42 74

4204

•4135

.4200

4087

■4134

4206

207

4189

CHUCK ASSEMBLY

DG — 62

4254

4196

Vs X I A

OIL SEAL

4165

4188

UNIVERSAL JOINT COVER

4163

4164

4226 42 31

4242 RH

4243

4244 R.H.

4245 L.H.

4227'

11b |mw

________

-/4240

4238

4 237

4225

4239

4241

6203

DRY

DG-47

DRY

4,206

I I 1

daily

CHUCK & BEARING

DG — 6 3

center rest assembly

4079

WHEEL

GREASE

DRESSER

DG-33

42 80

4 162

4 III

4103

413 8

5/g

|'/4OIL SEAL-

MACHINE ONLY

DG-48

WET

0UV££

INSTRUMENT CO. ADR)

427-

4104

” TAPER PIN'

4272

GREASE

4214

4210

fTt\ 4

4 209

1 2 7

4 I 2 5

rrrtm///////

4126

4128

4 121

/ / / / / /// ////y //////////// //////// TT/

CENTER REST LOCKING PLUG

[

CLUTCH STOP PIN

4153

[

CLUTCH LOCK RIVET

DIVE KEf SHAFT PIN

4138

VX2

.4120

4126

4020

42 76'

42 74'

4269

4271

4270

510 DRILLPOINTER

OILING CHART

ASSEMBLY CHART PARTS LIST

DECEMBER 16. 1942

4)54

4131

4113 4279

•4278

■42 7 3

MICHIGAN

4201

4200

7 7 / / /

4045

4121 /

]

4048

4055

^4114

4124 /

OIL DRIAN PLUG

4021

4004

4193

CUP

4008

62Q6

4141

4161

OIL LEVEL TO CENTEr/

OF GLASS GAGE

4160

. DRY

4190

WET

4106

DRIVE SHAFT

PACKING

4095

6206

4072

4291

4064. 4078"

4 290

FELT RING 4224

1-5/8 X 2 1/2

////

/Ur

///.

GARLOCK CHEVRON 7 PACKING f

fe ADAPTOR RINGS & V 2 CENTER RINGS

1/1/ ---■

[4189

/ 4066 4073

4065 4067

sWxi-lte' *4 31

4 185

4015

4 100

4197/

4179

6203 BRG.

4I75

4 191

FELT RING 42 24

4108

■4109

4107

4H07777777)

4133

4162

4 170

1-5/8

oil

4007

-4008 QUILL

PACKING

SPRINGS 4223

40l0

-6 2 06 BRG. 41(1

-4083

-4099

-4138 .DRIVE SHAFT

PACKING

4095

■4106

J-/4X 2"

•^OIL SEAL

. — 6204 BRG. j ^

X 2-i/2

SEAL

4059

GREASE

4171

4^66

Page 10

4165 4166

4170 4171

4172 4173

4173 4176

4177 4178

4179 4180

4186 4187

4188 4189

4190

4192 4193

4197 4200

4201 4202

4203 4204

4205 4206

4207

4208 4209

4210 4211

4212 4213

4214 4215

4216 4218 4225 4226

4227 4228

4229 4230

4231 4232

4233

4234 4235

4236 4237

4238

4239

Bearing Retainer Motor Pulley Belt Guard Belt Guard Stud Tool Tray (dry)

Tool Tray Bracket (dry) Water Pump Water Pump Brg. Bearing Retainer Pump Vane

Water Pump Cap Water Pump Shaft

Outboard Bearing

Wheel Guard (wet) Water Pan (wet) Settling Pan Pan Support

Water Nozzle Water Pipe Hose and Coupling

Chuck Bearing

Chuck Bearing Cap Chuck Pinion Bkt. Chuck Pinion Shaft Pinion Brg. Retainer Chuck Pinion Chuck Gear

Brg. End Plate Center Rest Stud Center Rest Arm Center Rest Arm Cap Center Rest Center Rest Screw

Arm Clamp Screw

Screw Pin Center Rest Lock Plug

Tee

Slot Bolt Arm Clamp Screw Pin Chuck Body Chuck Cheek Chuck Cheek Chuck Ring Chuck Dust Seal Chuck Screw

Chuck Screw Block Chuck Screw Retainer Chuck Screw Retainer Chuck Jaw Chuck Jaw Nut Chuck Jaw Nut

B C

Plate Plate Plate

R.H. L.H.

4240 4241 4242

4243 4244

4245 4247 4253

4254

4255 4258

4259 4260

4261

4262 4269

4270 4271A 4272

4273

4274

4275 4276

4277 4278

4280

4290

4291

4292

DG33 DG47 DG52 DG62

DG63 6203

6204 6206

2631 2689 2691

5/8" x li" Oil Seal it" x 2" Oil Seal 1-5/8" x 2i" Oil Seal 5/8" x 1-1/8" Top Packing Ring 5/8" x 1-1/8" Bottom Packing Ring 5/8" x 1-1/8" Center Packing Ring 9x2x5"

Universal Joint Leather Covers

2" Endless Rubber Belt

#4ll Aico-1 Handle Balls

6557 Ale'mite Gun

D) Plate E) Plate G) Plate

Plate

) Plate

Locking Plug

Screw Adjusting Plug

Screw Adjusting Plug Locking Plug Chuck Wrench Chuck Wrench Handle

False Jaws (large) False Jaws (medium) False Jaws (small)

Sleeve End

Universal Shaft

Shaft Sleeve Shaft Dust Sleeve Shaft Sleeve Key

Universal Joint Yoke Joint Yoke for Sleeve Joint Block Joint Pin Joint Pin Leather Dust Cover Motor Bracket Motor Bracket Shaft

(long) (

short

)

Motor Bracket Collar Wheel Dresser Assm.

Chuck Wrench Assm. Universal Shaft Assm. Chuck Assm.

Chuck and Brg. Assm. Ball Bearings Ball Bearings Ball Bearings Timken Cups (2) Timken Cone Timken Cone

Grinding Wheel

#0 Taper Pin

Page 11

Some special drills may require a little different

to obtain the four point contact on the lands, a few trials and this

setting

can he accomplished,,

You will notice the outer end of the jaws contact the drill

first.

the drill being held tight

or parallel to the top of the setting

The false jaws are set in on a slight angle which assures

the outer end.

Rotate the chuck by hand until the drill lip is horizontal

gage, then engage the chuck

clutch by turning handle (a) (Fig. 2) to the right to its limit.

Adjust the center rest (D) to support the rear end of the

drill,

under

drill within l/8"

motion, starting the machine.

It is not necessary to use the center on drills 5/3"

Lower the setting

of the grinding wheel, using hand wheel (e).

gage, REMOVE THE CHUCK WRENCH and bring the

Pull the operating lever (b) toward the operator

The drill is then brought in contact

the limit of

with the wheel by means of the hand wheel. Grinding is continued until the drill shows a clean sharp cutting

edge.

and

If it is necessary to grind off more than l/8 the drill should be reset to the gauge and a light cut taken to get the proper shape of point

The drill revolves in sight of the operator and when both

lips are clean and sharp, allow the wheel to make one or two passes

M of the drill,

over each lip without feeding, then quickly back the drill away from in contact with the wheel.

IT WILL BE NOTED FROM THE ABOVE THAT THE DRILL IS FIRST LOCATED IN THE CHUCK ACCORDING TO FIG. 5. AFTER WHICH, THE CHUCK IS REVOLVED BY HAND IN ITS BEARINGS TO OBTAIN THE PARALLEL LIP- SETTING

WITH THE TOP OF THE SETTING GAUGE (REMOVE THE CHUCK WRENCH).

TO CHANGE THE CLEARANCE

The machine is equipped with an adjustable clearance cam by

means of which the proper clearance for any material can be obtained.

Page 12

There are four varia

tions of clearance "which are

made as follows.

Remove the cover

(F) Fig. 2 and note the

capstan head screw (n) Fig.

4 between the quill

and flange.

This screw has four holes numbered 1 to 4 and it may be turned by

means of a pin (g).

Insert the pin to

its full may be turned from one posi tion to the next.

depth and the screw

#4 set ting is the maximum clear ance and #1 is the minimum

If more clearance

is desired than can be ob

Fig. 4

tained from the #4 cam setting, turn the chuck

(with the drill clamped in place) so that the lip of the drill comes

above the setting gage. The higher it is set the more clearance obtain

gear

 



ed. If less clearance is desired set the drill lip below the setting gaga



TO CHARGE THE CHISEL POINT ANGLE

The chisel point angle can be changed without changing the

clearance at all.

the closer the drill will drill to size.

The closer the chisel point angle Is to 90 degrees,

To make a greater chisel

point angle set the drill back away from the setting

back the greater the chisel point angle.

To decrease the chisel point

gage, the farther

angle set the drill out beyond the setting gage.

If a drill shows a tendency to rifle, it is an indication

that the chisel point angle is too great,

this is also true if the

drill lips chip off.

GRINDING 3 AND 4 LIP DRILLS

The machine is equipped to grind 2, 3 and 4 lip drills.

change gear knob (i) Fig. 2 in the main shaft operates with the gear

change mechanism. With the knob way in, the machine is set for 2-lip

drills.

by a spring plunger and is set for 3-lip drills.

Pull out about 3/4" and the rod stops at a position located

The next stop or

Page 13

clear out is for 4-lip drills.

DO NOT ATTEMPT TO SHIFT THE SLIDE KNOB (I) WITH THE MACHINE IN MOTION. After the knob has been shifted, the chuck clutch (a) Fig. 2, should be engaged by turning to the right and revolve the chuck by hand until the dive key (or drive) snaps into position.

If the machine is started before this drive is en



gaged, it Is liable to shear off the dive key.

Three and four lip drills are set l/4 inch back and the lip

10 to 15 degrees below the setting

gage, this varies

with different

makes of drills, but one or two trials will determine the proper posi

tion. WHEN SHARPENING THREE AND FOUR LIP DRILLS, FIRST, REMOVE THE HEAVY CENTER WEB ON A ROUGH GRINDER SO THAT THE DRILL POINTER GRINDS ONLY THE CUTTING LIP.

If the lip is set too high the cutting edge will be ground off.

Due to the difficulty of accurately centering a three lip drill in a two-jaw chuck, only the smaller three lip drills can be sharpened by holding them directly in the chuck jaws.

required the drill should be held in a split bushing. above 1-1/4 have a wall thickness of l/8

” have to be held in a split bushing.

” or 3/l6

” and be split

If accuracy is

The large drills

This bushing should

on one side only.

: :



TO GRIND DRILLS OFF CENTER

To grind drills off center loosen one false jaw and insert a shim of a thickness equal to the amount of !, the drill will

grind as desired. When the amount is found that gives

off center"

desired and

the best results, make a permanent shim marked with the job and the drill can be duplicated at any time.

DO NOT START THE MACHINE WITH

THE WRENCH IN THE CHUCK

The universal

lower end just ahead of the universal the machine is started with the wrench in the chuck and to replace the pin pry the shaft off the lower universal broken pieces of the sheared pin and install a new #0 taper pin. NOT USE A STRAIGHT PIN.

shaft driving the chuck has a shear pin at the

joint.

It is always best to reream the hole before

This pin will

joint,

shear if

take out the

putting in the new pin.

WATER ATTACHMENT

If a water attachment is supplied with the machine, it should

be used with as nearly full

flow as practical.

This is especially Important in grinding high-speed drills, which require a large quanti ty of water or none at all. A small stream of water while grinding is sure to start surface cracks,

which will

cause the drill to chip



while drilling.

Page 14

Clean out the water tank occasionally to eliminate

sibility of clogging.

Clean-out openings are conveniently located

any pos-

on the side of the pedestal for this purpose.

IF POINT DOES NOT LOOK RIGHT

If, at any time, a drill ground on the Oliver Drill Pointer

makes an oversize hole or the point does not look right, do not as

sume that the machine is out of time or needs adjustment and do not take the machine dawn or attempt to make adjustments, hut read the following item, CHECKING DRILLS. Oversize holes may he the results of the drill web being "out of center" or "out of index.

After checking the drills as described below and if the drills are found to be correct, but still consult your repairman who will have full

justments.

But first

be sure that the face of the grinding wheel is

do not seem to be ground right,

information on making ad

^/STRAIGHT AND SHARP and check the inside diameter of the grinding wheel



which should be 5 inches plus nothing minus l/l6".

CHECKING DRILLS

It is sometimes the case that a drill which seems to be accurately ground, does not drill a hole within a reasonable limit of the size of the drill and when this occurs check the drill for centrality of web and for index of the lips,

See instructions for

checking on next page.

Page 15

•

fig* 7

The web can be measured by

laying and measuring from the surface plate to the lower Then turn the drill to see that both

sides measure the same, Drills have one flute shallower than the

other. ground out either

Oliver for this purpose), until measure the same depth at the point

of the drill.

the drill on a surface plate

end of the chisel

(See Fig. 7) .

with the web "out of center"

The shallow

Drill

Point thinner

groove should be

by hand or on the

(designed

both grooves

point.

A drill can be tested for in

dex by laying it on a surface plate

and measuring one-half the drill di ameter from the surface plate to the lip at the outer end of the cutting edge.

Hold or clamp the drill in this position and measure to see that both measure the same (See Fig. 8).

Fig. 8

Drills with the lips

index"

to size by first grinding in the regular

can be made to drill closely

way, then before taking

drill from the chuck, loosen the jaws and revolve

revolution,

the setting gage as the first lip.

wheel until

til

both lips are ground or the operation must be repeated.

slight

will

give a hole close to size.

to how close the hole will

setting the second lip in exactly the same relation to

Now advance the drill to the

cut will

slight

cut is taken from--ONE LIP--do not continue un

remove the high point from the long lip and the drill

There is also some misunderstanding

come to the size of the drill.

among users of drills

"out of

the drill one-half

This

the



Information that we have been able to obtain drilled holes are usually the drill,

by any method.

and this refers to drills

Oversize holes may also result

about .005" per inch diameter larger than

carefully and accurately ground

apart from grinding, such as bent drills, spring driller

table

or spindle, method of holding

work, etc.

indicates that

from causes entirely

condition of the

Page 16

!■

Most drills are ground at 118° point angle and this will he

found satisfactory for the general run of work in cast iron and steel.

However, modern requirements have made it necessary to grind drills

at various point angles; a flatter angle for the harder materials and

a sharper angle for countersinks, etc.

MANY COMBINATIONS OF POINT

ANGLE AND CLEARANCE MAY BE OBTAINED ON THE OLIVER DRILL POINTER.

WEB THICKNESS

Nev drills have a web thickness of about 1/8 the diameter and

this increases toward the shank. reduce the thickness to about one-tenth of the diameter, point reduces the thrust and if not carried too far back, does not

It is advisable for some purposes to

The thinned

materially weaken the drill.

Care should be exercised in thinning a drill to keep the web central and its thickness should not be reduced below one-tenth diameter

2 1/2 times the width of the web.

l/lOth, should have the full point work)

The thinning should not run up the drill web more than

Thus a 1" drill with web thinned to

thickness of the web l/4

(THE OLIVER POINT THINNER is very efficient on this class of

n back from the

the

DRY GRINDING

High speed drills may be ground dry without injuring them in any way. If it is understood that these drills are heated to about 1050 F.

dent that a temperature less than this cannot injure them.

(which is dull red), in the tempering operation, it is evi

It Is also



true that they become a deep blue when used at their proper feeds and speeds.

not do any harm.

with water.

Consequently a slight color, brought about by grinding, will

(see previous instructions regarding grinding drills

)

COOLANTS

Various lubricants or coolants are used In drilling and their

choice depends upon individual experience.

There is one rule, how

ever, which should be followed, and that is, USE PLENTY, especially

with High-Speed drills.

OLIVER INSTRUMENT COMPANY

ADRIAN, MICHIGAN. USA

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Page 17

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Page 18

r-~ ■

Manufacturers

DRILL POINTERS

TOOL AND CUTTER GRINDERS

FACE MILL GRINDERS

DRILL POINT THINNERS

TOOL BIT GRINDERS

FILING MACHINES

DIE-MAKING MACHINES