Oliver Instrument Drill Point Thinner - Installing and Operating Grinder

Directions

for

Installing and Operating

DRILL POINT THINNER

OLIVER INSTRUMENT CO.

ADRIAN, MICH., U. S. A.

.*> ------- 1

OPERATING

INSTRUCTIONS FOR OLIVER

DRILL POINT THINNING MACHINE

The Oliver Drill Point Thinner is an universal drill point thinning machine
in that most all types of thinning can be handled on the same machine. All of the
operations are done with one grinding wheel. The wheel is dressed with a self
contained diamond dresser and no hand dressing is required for any type of thinning.
Many operators think the wheel has to be formed to the shape of the drill flute.
This is absolutely not required on this machine since we pivot the grinding wheel
head to compensate for the various flute shapes found in twist drills.

The machine consists primarily of a pedestal
vertically, a carriage which is adjustable horizontally and which in turn supports

9 a column which is adjustable

the drill holding mechanism.

This mechanism consists of a drill rest and a trunion supporting casting
which is used to index a two flute drill exactly 180 degrees,

A movable carriage

is mounted on top of the column to which is attached a totally enclosed ball bearing
motor. This motor is mounted on a slotted swivel base so that any reasonable com



bination of angles is easily obtainable. The motor carriage is carried on hardened
and ground shafts which ride thru ball bushings.

Oil seals on these shafts keep the shafts clean and make it possible to have
the ball bushings in an oil reservoir so that the shafts and bearings are properly
lubricated at all times. To avoid excessive wear, fill at frequent intervals.

The

reservoir around the bushing and shaft assembly holds one pint of good machine oil.
A small oiler found on the side of the carriage (#3524) is used to replenish this

reservoir.

Be sure to double check the oil supply in this reservoir when setting

up since some may have been lost in transit.

When setting the machine up in your cutter grinding department check the

direction or rotation of the grinding wheel.
wise as you face the machine,

This will throw the sparks to the left. A sheet metal

The grinding wheel should run clock-

shield will be found on the end of the carriage to deflect these grinding sparks.

DO NOT HAND DRESS THE GRINDING WHEEL

The edge at the 0. D. of this wheel will round over with use. On larger
drills the rounded edge can be larger but never let the radius on the wheel get
larger than about l/8 the drill diameter. Use the diamond dresser occasionally
to keep the rounded edge on the wheel from getting too large.

The drill holding unit can be swiveled for thinning both right hand and left
hand drills still using the same shaped wheel. One other operation that can be
handled on the machine is to cut-off broken drills with a rubber cut-off wheel

(no wheel furnished).

We suggest the use of a standard drill of the same size mentioned below when
making the first set-up on this machine,

When the functions of this machine are

understood then it will be very simple for the operator to set-up for other sizes.

-1-

The following is the set-up, step-by-step, for a 1-1/2" or

thinned and corrected as shown by the No* 1 drill point sketch in FIG-2* This

1-3/4" drill to be

centers the web and makes the two cutting edges 180 degrees apart all in one operation
with very little

change in the hook on the cutting edge.

FIG-1 illustrates the machine setup to thin drill points No. 1 and 2 in FIG-2.

First, mount the grinding wheel on the motor and dress it to a sharp corner.
To do this, remove the wheel guard cover and make sure the diamond is up out of the
way so that the wheel will not touch it*
on the wheel mount. Be sure there are paper felt washers on each side of the wheel.
Tighten the Allen screw in the diamond bracket so that the diamond will stay in

Place a 6" x 3/4" x 1-1/4" grinding wheel

position.

Before putting the cover on, adjust the diamond downward until it just begins
to touch the back corner of the wheel when moving the diamond holder back and forth
past the wheel. Put the cover on and turn the diamond down not over l/lO of a turn.

Push the diamond bracket handle K back and forth slowly, screw the diamond down

another approximate l/lO of a turn, push the dresser handle back and forth again.
Continue this until the 0. D. surface of the wheel is fully dressed to an angle.
NOTICE; feed diamond down when dresser handle is pulled toward operator.

Next, position the motor on the carriage. First, loosen the two motor clamp
bolts.
the tee slot.

Move it so that the motor base is about 1-1/2" from the right hand end of

Position the motor on an angle about l/2 its full adjustment. See

FIGS. 1, 3 and 4 (if swiveled to full swing or adjustment this would be too much for

this size drill). Now tighten motor clamp bolts.

By setting the motor on an angle, the wheel is drawn thru the drill at an angle
which produces the same results as if a wide or formed wheel were used. See sketch D,

FIG-8. The larger the drill the greater the angle that is needed on the motor. See
sketch B and C, FIG-8. Sketch B shows the grinding wheel angled only a small amount
for smaller drills.
larger drills.

Sketch C shows the grinding wheel angled a greater amount for

Sketch A shows the grinding wheel as dressed but without angular

adjustment.

The exact angle for different sizes of drills cannot be graduated on the swivel

because the different types of thinning and the different sizes of wheels require

different angles for the same size drills. However, if a full throat or flute thinning

is required, the motor must be turned until the elliptic of the wheel fits the flute

of the drill.

See sketch D, FIG-8. For the first drill we suggest you do not try the

full flute thinning.

To set the drill, position the square bar almost level or horizontal and set the

swivel J at about 35°. Use the proper sleeves (a) to fit the taper shank on the drill
and mount in bracket B. This unit rests in yoke C as shown in FIG-1. Next adjust

yoke C on the square bar until the end of the drill comes near the end of the vee

blockD. Roll the drill until the flute is up as shown in FIG-4 and lock in position

with the knurled screw in bracket B. Loosen nut E and press down on the drill so that

the vee block D will line up with the drill and then tighten nut E. Now, readjust the
square bar so that the drill sets nearly level or horizontal. The tang or shank end

never wants to be high, really it should be a little low.

-2-

Raise the motor with hand wheel F so that the wheel will pass over the drill*

Move the motor carriage back and forth with handle G to determine if the grinding

wheel passes over the end of the drill,

of the drill directly under the wheel,

wheel can be brought down into the drill flute.

Adjust the hand wheel H to bring the flute

Then, by adjusting hand wheels F and H the

You will notice the wheel nearly

fits the flute as it passes back and forth thru the end of the drill.

The angle on the wheel should be nearly parallel with the cutting edge of the
drill. If it is not, an adjustment can be made by loosening the knurled screw in
bracket B and turning the drill until the cutting edge at the 0. D. of the drill is

a little
the knurled screw holding the drill in place.

into the drill until the wheel touches the drill in the bottom of the flute,

farther away from the wheel than the center cutting edge is. Then tighten

Continue to lower the grinding wheel

The
first touch should be a little spot at the point of the drill just off center toward
the operator.

edge or in behind the cutting edge,

See FIG-6. Never start touching or grinding the drill on the cutting

We advise the operator to use his left hand to

hold the drill down in the vee while passing the wheel thru the end of the drill.

Continue to grind by lowering the wheel about .005** or .010" at a time. (Watch
graduated dial on hand wheel F) Make 2, 3 or 4 passes thru the drill each time the
grinding wheel is lowered.

Grind away about l/4 the thickness of the web. At this

point if the drill should look like drill point No. 2 in FIG-2 and you prefer to

‘ have it like No. 1 in FIG-2 roll the drill slightly and bring the cutting edge

closer to the grinding wheel. Make a few passes to clean up the grind. The amount
of roll can be controlled to bring the grind just to the outer edge.

Now

, at this point follow instructions closely,

Set the dial at hand wheel F
at ZERO. Turn the hand wheel one turn to the right, pick the drill and drill holder B
up out of yoke C and turn it over l/2 turn.

into the vee D and that the pins in bracket B are properly located into yoke C.

Make sure the drill is well seated down

Thin

out this second side of the drill until the graduated dial again indicates zero. By
this method both sides of the drill will be thinned in perfect relationship to each

other,
the other.

The grind may sometimes indicate that more was ground out of one side than

This is an indication that the drill was not accurate and the thinning

has corrected the geometry at the point.

If, at this point, the web of the drill is still too thick, more can be taken

out of the flute making sure the same amount is taken out of each side by using the

graduated dial at hand wheel F.

The above set up produces the type of thinning most commonly used,

other types of thinning are to be done on the machine we recommend that the operator

Even though

thin his first drill as described above so that he becomes familiar with the operation
and principles of the machine.

We found that after an operator has made a few setups and thinned different
types of points he soon becomes familiar with the machine and can set it up quickly
and accurately. There are no setting gages for the lip of the drill.

The machine

is universal and can do all types of thinning and handle all sizes of drills, 5/16
to 3 inch diameters. This wide range makes it impossible to use any type of setting
gage. An operator will soon become accustomed to the use of the machine and will

adopt certain types of thinning which can be easily reproduced.

-3-

A small vee block is supplied with the machine to be used when thinning

small drills.

This block is placed in position on top of vee block D, FIG-1.

TO GRIND A CHIP-BREAKER

To grind a chip-breaker, see FIG-7 and drill point #3 drill in FIG-2. Set

swivel J at 59° (If the drill has a standard 118 degree included point angle).
The idea is to get the drill cutting edge parallel with the motor carriage movement.
Different included drill point angles require different angle settings. Lift the

square bar up about 20 or 30 degrees as shown in FIG-7. Set the motor nearly square

on the carriage and somewhere near the center. The grinding wheel will then form a

shape similar to sketch A, FIG-8.

Put the drill on the machine as described before and then adjust hand wheel F
and H to grind a small chip-breaker the full length of the cutting edge. The drill
can be thinned at this same time by grinding a little
center. If more or less hook is required on the cutting edge raise or lower the

more out near the point or
angle setting of the square bar.
THINNING FOR BRASS DRILLING

For brass drilling

see drill point #4 in FIG-2.

Make the setup the same as

for chip-breakers EXCEPT set the square bar down at an angle of 20 or 30 degrees.
TO SPLIT POINT ON DEEP HOLE DRILLS

For deep hole drills set the swivel J at zero. Drop the square bar clear down
as far as it will go. Set the motor square and a little to the left of the center
of the carriage. See FIG-5. The drill is then set in the holder and vee as before.
However, with this type of thinning, the chisel angle of the drill must be vertical.

It is very important that the chisel point be set straight up and down as close as
can be done visually.
so that the back side of the v/heel is in line with the center of the drill.
recommend using a 6" x l/4

Position the drill under the grinding wheel with hand wheel H

” x 1-1/4

” hole grinding wheel for this operation as it

We

is not necessary to grind to the 0. D. of the drill. A narrow notch near the center
of the drill is all that is necessary.

Lower the grinding wheel at each stroke through the end of the drill until the
wheel has reached approximately the center of the chisel point of the dril-1 and then
set the dial at ”0” on hand wheel ”F”
grind the other side to the same dial reading. This should come very close to the
other grind. If it does not meet the previous grind, grind one-half the distance

. Raise the v/heel, turn the drill over and

left and then turn the drill over and grind out the opposite side.
THINNING #6 DRILL IN FIG. 2

The drill No. 6 illustrated in FIG-2 is thinned out ahead of the chisel point.
By this method of thinning the cutting edge of the drill is not ground at all.

Extreme care must be taken when thinning drills in this manner as this point cannot

be used on all types of materials. This thinning is recommended for lighter or

softer materials.

-4-

C^tional accessory equipment is available for this machine at extra cost# We
can supply special trunions to permit the proper indexing and grinding of both
three and four flute drills# Extra long drill holder slides (#3586) can be furnished

for supporting long length drills (give maximum length of drill when ordering).
Various capacity Jacobs Chucks complete with adaptors can be supplied for use with
straight shank tools. A three jaw lathe type chuck complete with adaptor can be
furnished for use with very large straight shank tools.

OLIVER INSTRUMENT COMPANY

ADRIAN, MICHIGAN

U.S.A.

-5-

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PARTS LIST

OLIVER POINT THINNER

Quan.

1

1
1
1
1
1

1
1
1

2

1

1

1

1

1

1

1

1

1

1

1

1

1

2

1

1
1
1
1
1
1
1
1

2

1
1

1
1
1
1
1
1
1

1

1

1

1

1

1

1

No*
3500A
3501A
3502C
3503
3504B
3505A
3506
3507
3508

A

3509
3510A
3511A
3512A
3513A
3514A

3515
3516A
3517A

3518A
3519A
3520A
3521A
3522A
3523B
3524C
3525A
3526A
3527

C
3528C
3531C
3532C
3533A
3534B
3535A
3536

3537A
3538

A

3539
3540
3541
3542
3543
3545
3547

3572
3573
3574

3575

3576
3577

Part

Pedestal
Column Bearing
Column

Column Key

Oil Tube

Column Top
Column Bearing Felt

Column Bearing Felt Retainer Plate

Elevating Shaft Bearing
Elevating Screw Miter Gear
Elevating Screw

Elevating Hand Wheel Shaft

Elevating Hand Shaft Collar

Elevating Screw Thrust Washer

Elevating Shaft Hand Wheel Bearing

Elevating Shaft Bushing
Wheel Dresser Arm
Wheel Dresser Shaft
Diamond Holder
Diamond Holder Knob

Cut Off Wheel Spacer
Wheel Mount
Wheel Clamp

Carriage Slide Plate

Carriage

Motor Bracket Swivel Stud

Motor & Wheel Guard Base

Wheel Guard

Wheel Guard Plate

Carriage End Plate R.R.

Carriage Reciprocating Lever

Reciprocating Lever Shoulder Bolt

Lever Fulcrum Link

Fulcrum Link Shoulder Bolt

Hand Lever
Carriage End Plate L.H.
Carriage Washer
Pivot Clamp Bolt

Pivot
Pivot Holder
Pivot Holder Index Collar

Pivot Holder Clamp Screw
Wheel Dresser Shaft Collar
Grinding Spark Guard

#34 Jacobs Chuck Adaptor

Feed Screw Nut

Carriage Feed Screw

Carriage Feed Screw Collar

Carriage Dust Wiper

Carriage Dust Seal Wiper Retainer

-1-

Parts List - Oliver Point Thinner

2
1

1
1
1
1
1
1
1

1
1
1
1

1
1
1

1

1

1

1

1

1 spec

1 spec
1
1
1
1
1
1
1
1
1

1
1
1
1
2 sets

4

1
1

2

3579A
3580A
3581A
3582A
3583A
3534A
3585A
3586A

3587
3588A
3589A
3590A
3591A
3592A
3593A
3594A
3595A
3596A
3597A

3598A
3599A
3600A
3601A
3602
3603
415
418
438

643
644
689
6930
6227

Work Carriage Shim

Carriage Slide Mounting Plate
Carriage Slide
Work Carriage Cap
Work Carriage
Work Carriage End Plate

#20 Jacobs Chuck Adaptor

Drill Holder Slide

Table Clamp Bolt Washer

Yoke

Sleeve Holder

”V” Block Pivot

"V" Block
Clamp Bolt

Drill Holder Sleeve

Yoke Clamp Screw

”V” Block (for small drills)

#1 to #5 Morse Taper Sleeve

#2 to #5 Morse Taper Sleeve
#3 to #5 Morse Taper Sleeve
#4 to #5 Morse Taper Sleeve
Sleeve Holder 3 lip drills
Sleeve Holder 4 lip drills
Center Rest Arm Cap

Lathe Chuck Adaptor
Hand Wheel

Elevating Hand Wheel Dial
Feed Screw Dial Set Screw
Swivel Bracket Holder
Swivel Stud Nut Plug
Pulley Washer
Hand Wheel

Lock Screw

5/8

” Thrust Bearing

#2 Rockwood Pressed Steel Handle

Davies Ball Knob (#50C)

3/4 Shaft & Bushing Assemblies (Thomson)

1 shaft - 2 bushings
1-1/4

” CD x 3/4

” ID Oil Seals x 3/8

”

l/2 HP, 3600 RPM Totally Enclosed BB Motor

6

” x 3/4

” x 1-1/4

” 38A60 J5VBE Straight

Grinding Wheel

Misc. Screws, etc.

1/2 x 1-3/4 T Slot Bolts

-2-