DeWalt DW751 Instruction Manual

DEWALT Industrial Tool Co., 701 East Joppa Road, Baltimore, MD 21286 Printed in U.S.A. (JAN98-CD-1) Form No. 385103

DW751 Copyright © 1998

DW751/385103 5/2/02 12:51 PM Page 2

INSTRUCTION MANUAL
GUIDE D'UTILISATION
MANUAL DE INSTRUCCIONES

DW751
Drill Bit Sharpener

Affûte-foret
Afilador de brocas

INSTRUCTIVO DE OPERACIÓN, CENTROS DE SERVICIO Y PÓLIZA
DE GARANTÍA. ADVERTENCIA: LÉASE ESTE INSTRUCTIVO ANTES
DE USAR EL PRODUCTO.

Questions? See us on the World Wide Web at www.dewalt.com

DW751/385103 5/2/02 12:51 PM Page 3

Important Safety Instructions

WARNING: When using electric tools, basic safety precautions
should always be followed to reduce risk of fire, electric shock, and
personal injury, including the following:

READ ALL INSTRUCTIONS

Grounding Instructions

This tool should be grounded while in use to protect the operator from
electric shock. The tool is equipped with a 3-conductor cord and 3­prong grounding type plug to fit the proper grounding type receptacle.
The green (or green and yellow) conductor in the cord is the
grounding wire. Never connect the green (or green and yellow) wire
to a live terminal. If your unit is intended for use on less than 150 V,
it has a plug that looks like that shown in sketch A. If it is for use on
150 to 250 V, it has a plug that looks like that shown in sketch D. An
adapter, sketches B and C, is available for connecting sketch A type
plugs to 2-prong receptacles. The green-colored rigid ear, lug, or the
like, extending from the adapter must be connected to a permanent
ground, such as a properly grounded outlet box. No adapter is
available for a plug as shown in sketch D. ADAPTER SHOWN IN
FIGURES B and C IS NOT FOR USE IN CANADA.

English

IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT THIS
OR ANY D

EWALT TOOL, CALL US TOLL FREE AT:

1-800-4-DEWALT (1-800-433-9258)

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1
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2"

ENTIRE

LOCATOR EDGE

TOUCHING

FLUTE

SHARPEN/DRESS

SELECTOR

FEED KNOB

INDEX SLEEVE

SWINGHEAD

CHUCK

LOCATOR

GRINDING

WHEEL

LATCH

EYE SHIELD

WHEEL
COVER

DRESS KNOB

DUST SHIELD

DIAMOND
DRESSER

GUARD BAND
ADJUSTMENT

SCREW

ON/OFF
MOTOR
SWITCH

AB CD

GROUNDING PIN

GROUNDED

OUTLET

BOX

GROUNDING

MEANS

GROUNDING PIN

ADAPTER

DW751/385103 5/2/02 12:51 PM Page 4

Safety Instructions For All Tools

• KEEP WORK AREA CLEAN. Cluttered areas and benches invite
injuries.

• CONSIDER WORK AREA ENVIRONMENT. Don’t expose power
tools to rain. Don’t use power tools in damp or wet locations. Keep
work area well lit. Do not use tool in presence of flammable liquids
or gases.

• GUARD AGAINST ELECTRIC SHOCK. Prevent body contact
with grounded surfaces. For example; pipes, radiators, ranges, and
refrigerator enclosures.

• KEEP CHILDREN AWAY. Do not let visitors contact tool or
extension cord. All visitors should be kept away from work area.

• STORE IDLE TOOLS. When not in use, tools should be stored in
dry, and high or locked-up place — out of reach of children.

• DON’T FORCE TOOL. It will do the job better and safer at the
rate for which it was intended.

• USE RIGHT TOOL. Don’t force small tool or attachment to do the
job of a heavy-duty tool. Don’t use tool for purpose not intended.

• DRESS PROPERLY. Do not wear loose clothing or jewelry. They
can be caught in moving parts. Rubber gloves and non-skid
footwear are recommended when working outdoors. Wear
protective hair covering to contain long hair.

• USE SAFETY GLASSES. Also use face or dust mask if cutting
operation is dusty.

• DON’T ABUSE CORD. Never carry tool by cord or yank it to
disconnect from receptacle. Keep cord from heat, oil, and sharp
edges.

• SECURE WORK. Use clamps or a vise to hold work. It’s safer than
using your hand and it frees both hands to operate tool.

• DON’T OVERREACH. Keep proper footing and balance at all
times.

• MAINTAIN TOOLS WITH CARE. Keep tools sharp and clean for
better and safer performance. Follow instructions for lubricating

and changing accessories. Inspect tool cords periodically and if
damaged, have repaired by authorized service facility. Inspect
extension cords periodically and replace if damaged. Keep
handles dry, clean, and free from oil and grease.

• DISCONNECT OR LOCK OFF TOOLS when not in use, before
servicing, and when changing accessories, such as blades, bits,
cutters.

• REMOVE ADJUSTING KEYS AND WRENCHES. Form habit of
checking to see that keys and adjusting wrenches are removed
from tool before turning it on.

• AVOID UNINTENTIONAL STARTING. Don’t carry tool with finger
on switch. Be sure switch is off when plugging in.

• EXTENSION CORDS. Use only 3-wire extension cords that have
3-prong grounding-type plugs and 3-pole receptacles that accept
the tool’s plug. Replace or repair damaged cords. Make sure your
extension cord is in good condition. When using an extension cord,
be sure to use one heavy enough to carry the current your product
will draw. An undersized cord will cause a drop in line voltage
resulting in loss of power and overheating. The following table
shows the correct size to use depending on cord length and
nameplate ampere rating. If in doubt, use the next heavier gage.
The smaller the gage number, the heavier the cord.

Minimum Gage for Cord Sets

Volts Total Length of Cord in Feet

120V 0-25 26-50 51-100 101-150
240V 0-50 51-100 101-200 201-300

Ampere Rating

More Not more American Wire Gage (AWG)
Than Than
0-6 18 16 16 14
6 - 10 18 16 14 12
10 - 12 16 16 14 12
12 - 16 14 12 Not Recommended

1

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DW751/385103 5/2/02 12:51 PM Page 1

2

• OUTDOOR USE EXTENSION CORDS. When tool is used
outdoors, use only extension cords intended for use outdoors and
so marked.

• STAY ALERT. Watch what you are doing. Use common sense. Do
not operate tool when you are tired.

• CHECK DAMAGED PARTS. Before further use of the tool, a guard
or other part that is damaged should be carefully checked to
determine that it will operate properly and perform its intended
function. Check for alignment of moving parts, binding of moving
parts, breakage of parts, mounting, and any other conditions that
may affect its operation. A guard or other part that is damaged
should be properly repaired or replaced by an authorized service
center unless otherwise indicated elsewhere in this instruction
manual. Have defective switches replaced by authorized service
center. Do not use tool if switch does not turn it on and off.

Additional Safety Rules for Drill Bit
Sharpener

WARNING: This professional tool is designed for fast, accurate
sharpening of right-hand, 2-flute twist drill bits from 1/8" (3 mm) to
1/2" (13 mm) in diameter. DO NOT attempt to sharpen carbide­tipped or cobalt bits. Since proper procedure is essential to
satisfactory results, read the operating instructions carefully, and,
for your own protection, pay close attention to the safety rules.

• Wear eye protection.

• Use grinding wheel suitable for speed of grinder.

• Replace cracked wheel immediately. Handle grinding wheels

carefully to avoid bumping or dropping. DO NOT use a grinding
wheel that has been dropped. Before using, inspect each grinding
wheel for cracks or flaws and if these are evident, discard the
wheel.

• Always use guards and eye shields. Keep the eye shield mounted

in proper positions.

• Do not overtighten wheel nut. Before mounting a new wheel, be
sure that it is marked with an R.P.M. that is the same as, or higher
than, the no-load speed of the tools as marked on the nameplate.

• Use only flanges furnished with the grinder.

• Bolt the drill bit sharpener to a bench to prevent movement.

• Adjust distance between wheel and guards to maintain 1/16" (1.6
mm) or less separation as the diameter of the wheel decreases
with use.

• Use accessories only in proper and intended manner.

SAVE THESE INSTRUCTIONS

Drill Bit Terminology

A primary requirement for drilling accurately sized holes is that there
be minimal difference between the lip heights of the two flutes.
Variations in the two lip heights will alter the centrality of the point
which will produce eccentric drilling. (See Figures 1, 2, and 3.) See
paragraph 6 of the “Troubleshooting” section in this manual. Your
D

EWALT sharpener is engineered to produced equal lip heights and

a centrally located point.

Mounting the Sharpener

FOR BEST RESULTS YOUR SHARPENER SHOULD BE
MOUNTED TO A FIRM WORK SURFACE. Drill two 5/16" (8 mm)
holes in work bench as shown in Fig. 4. Insert two 1/4" (6 mm)
diameter carriage bolts. Slide Sharpener over bolt heads and fit bolt
heads into openings provided in bottom of tool (Fig. 5.) Tighten nuts
on bolts evenly with moderate force. Do not overtighten!

English

DW751/385103 5/2/02 12:51 PM Page 2

Main Functional Parts of Your Drill Bit
Sharpener

CAUTION:

• Play it safe—know all follow all SAFETY RULES.

• Be sure locator is clear of grinding wheel before starting motor.

• Use light pressure and an even motion in rocking the swinghead
when grinding.

• When shifting from BIT SHARPENING to WHEEL DRESSING—
and vice versa—follow instructions with extra care.

• Replace a cracked wheel immediately.

• Never disassemble the tool or try to do any rewiring in the electrical
system.

The Sharpen/Dress selector programs the tool for either bit
sharpening or wheel dressing. The Feed Knob provides precision
control of feed rate (material removal) during sharpening. The Index
Sleeve permits you to sharpen first one side of the drill bit tip, and
then the other side without removing the bit from the chuck. The
Swinghead lets you move the bit across the grinding wheel at the
correct angle repeatedly. The Chuck holds bit in position during
sharpening operation. The Locator guides positioning of drill bit so
that sharpening will be correct and accurate.

Shifting Selector Sharpen Bits or Dress
Wheel

(Figs. 6, 7, 8, 9, 10)

When you are ready to sharpen bits, the selector switch must be in
the “S” (sharpen) position. The “D” (dress) position is used when
dressing the grinding wheel.

IMPORTANT: Improper shifting from “D” (wheel dressing) to “S”
(bit sharpening), and vice versa, can cause damage and make your
sharpener inoperative. The correct methods of shifting are
illustrated.

3

English

FIG. 4

FIG. 1

FIG. 2

(122.2 mm)

Tool Outline

Front

(82.5 mm)

3 1/4"

4 13/16"

FIG. 5

HELIX

ANGLE

FIG. 3

120° TO 135°

CHISEL EDGE

ANGLE

INCLUDED ANGLE

OF POINT 118°

LIP RELIEF

ANGLE

FLUTE

FLUTE LENGTH

WEB

CUTTING

LIP

DW751/385103 5/2/02 12:51 PM Page 3

4

SHIFTING FROM “S” (SHARPEN) TO “D” (DRESS)
NOTE: Be sure to do Step 1 before Step 2. Otherwise, the

swinghead will not move up to the eye shield.

1. Pivot swinghead to normal sharpening position (Fig.6).

2. Rotate swinghead until it touches the eyeshield (Fig.7).

3. Move mode selector switch to “D” (Fig.8).

SHIFTING FROM “D” (DRESS) TO “S” (SHARPEN)

1. Line up mark on dress knob with parting line of housing. Position
swinghead close to the eyeshield (Fig. 9).

2. Shift mode selector to “S.” DO NOT FORCE. If selector switch
will not seat, rock dress knob back and forth while keeping slight
pressure on selector switch until it snaps into place (Fig. 10).

Sharpening of Drill Bits

(Figs. 11, 12, 13, 14, 15, 16)

PREPARING TO SHARPEN
NOTE: First, check the unit for the adjustments explained in the

“Adjustments” section of this manual.
1

. The swinghead has two indexing positions, 180° apart. Rotate sleeve

to make sure it is seated, with locator in top position. Make sure selector
switch on top of the tool is in the “S” (sharpen) position (Fig. 11).

2. Press latch toward swinghead and move swinghead toward
loading position (Fig. 12).

3. Open chuck jaws by turning chuck nut counter-clockwise (Fig.13).

4. Insert smaller diameter bits past the locator directly into the chuck
(Fig. 14).

5. Insert larger diameter bits through the opening in the chuck head
(Fig. 15).

6. Position bit so that tip is approximately 1/16" (1.6 mm) below end
of locator. Be sure straight edge at end of locator is flat against
flute. This positioning of the bit with the locator is the key to
satisfactory sharpening (Fig. 16).

English

FIG. 6 FIG. 7

FIG. 9

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FIG. 8

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FIG. 10

PARTING LINE

MARK

DW751/385103 5/2/02 12:51 PM Page 4

SHARPENING FIRST CUTTING LIP (Figs. 17, 18, 19)
NOTE: Broken bits are more easily sharpened if they are first

roughed into shape by hand on a bench grinder. This will eliminate
unnecessary wear on the grinding wheel.

1.

With motor “OFF,” lower swinghead to sharpening position (Fig. 17).

2. Turn feed knob clockwise until bit is almost touching the wheel
when swinghead is rocked back and forth (Fig. 18).

NOTE: Turning feed knob clockwise feeds bit into wheel; turning
counterclockwise backs bit away from wheel.

3. Turn motor “ON,” Gently rock swinghead back and forth as you
turn the feed knob clockwise. DO NOT USE HEAVY HAND
PRESSURE WHEN ROCKING THE SWINGHEAD.

IMPORTANT: Advancing the feed knob one number (e.g., 2 to

3) moves the bit 5 thousandths of an inch closer to the wheel. Each

calibration (mark) between numbers moves the bit 1 1/4 thousandths.

4. Moving the feed knob clockwise one calibration (mark) at a time,
continue to rock the swinghead across the wheel until the edge of
the bit is about 1/32” (.8 mm) from the end of the locator. BE
CAREFUL NOT TO GRIND LOCATOR.

IMPORTANT: Make a note of the final feed knob setting because

you’ll need it when you sharpen the second lip.

5. Now turn feed knob counterclockwise several turns to back bit
away from grinding wheel.

6. Move swinghead down and back to rest position illustrated. Rotate
sleeve 180° clockwise until it snaps into the second index position.
(The locator will now be on the underside of the chuck.)(Fig. 19)

SHARPENING SECOND CUTTING LIP

1. Repeat steps 3 and 4 under “Sharpening first cutting lip.”

2. STOP SHARPENING WHEN THE FEED KNOB REACHES THE
CALIBRATION YOU NOTED.

5

English

FIG. 11

FIG. 12

FIG. 14

FIG. 13

FIG. 15

FIG. 16

DW751/385103 5/2/02 12:51 PM Page 5

6

For finest finish, turn feed knob one more calibration and grind
bit. Without touching feed knob, turn sleeve 180° clockwise (step
6 on page 5) and grind first lip until sparking stops.

3. Turn motor “OFF.” Raise swinghead to loading position and
remove bit.

CAUTION: Tip of bit may be hot.

Wheel Dressing (Figs. 20, 21, 22)

The special grinding wheel included with your DEWALT drill bit
sharpener is ready to sharpen your bits. When the sharpening
surface becomes worn and uneven, it’s time to dress the wheel.
Follow these steps:

IMPORTANT: See instructions for shifting from “S” (sharpen) to

“D” (dress) under “Shifting selector to sharpen bits or dress wheel.”

After you have taken the necessary steps, proceed to:

1. Press latch and move swinghead to loading position.

2. Take diamond dressing tool which is kept in the spring-clip in back
of the sharpener. Remove protective sleeve. Position the dust
shield as shown below. Position diamond dresser in chuck, with
diamond tip 1/16" (1.6 mm) beyond locator as illustrated. Tighten
chuck jaws by turning chuck nut clock-wise. Slide dust shield up
against face of chuck to prevent grit and dust from fouling chuck.
(Fig. 20 & 21)

3. Move swinghead downward until latch engages. Adjust feed knob
clockwise until diamond tip almost touches sharpening surface of
the grinding wheel.

4. With SLIGHT PRESSURE, push swinghead back and away from
eyeshield until it stops.

5. Turn motor “ON.” Maintain light pressure, away from the
eyeshield, on the swinghead. Move the diamond back and forth
across the wheel by turning the dress knob clockwise and
counterclockwise. Feed the diamond into the wheel by turning

English

FIG. 17

FIG. 18

FIG. 19

SLEEVE

TURN SLEEVE 180°

DW751/385103 5/2/02 12:51 PM Page 6

the feed knob, clockwise, one calibration at a time. Smooth,
continuous motion completely across the face of the wheel will
provide a smoother finish. Stopping the diamond on the wheel
will score it. Removing wheel material during the outside-to-inside
motion of the diamond will assure a finer finish (Fig. 22).

6. Turn motor “OFF.” Back off feed knob (turn counterclockwise)
enough so that diamond clears sharpening surface of wheel.
Return swinghead to loading position. Remove diamond dresser
and dust shield.

TO CHANGE FROM “D” (DRESSING) TO “S”
(SHARPENING)(Fig. 23)

1. Line dress knob mark up with parting line of housing.

2. Move swinghead close to eyeshield.

3 . Shift mode selector to “S.” DO NOT FORCE. If selector will not

seat, check position of dress knob mark.

Wheel Replacement

Replace the grinding wheel when it has been worn down from the
original 5" (127 mm) to 4" (102 mm) diameter.

CAUTION: REPLACE A CRACKED WHEEL IMMEDIATELY!

For replacement, use only a D

EWALT 5" (127 mm) x 3/4" (19 mm)

wheel (DW7510). This wheel is designed specifically for this tool.
To replace the grinding wheel:

1. UNPLUG TOOL.

2. Remove 3 screws holding wheel cover and remove cover.

3. Hold wheel with a rag to keep it from turning and remove spindle
nut and clamp washer (LEFT HAND THREAD—TURN NUT
CLOCKWISE). Remove wheel.

4. Move guard band and finger guard to uppermost position (Fig.

27.).

7

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IN

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S

FIG. 20

FIG. 22

FIG. 23

FIG. 21

SWINGHEAD

SHARPEN/DRESS

SELECTOR

PARTING LINE

MARK

DRESS

KNOB

DIAMOND
DRESSER

DUST

SHIELD

DW751/385103 5/2/02 12:51 PM Page 7

8

5. Attach new wheel (Fig. 24) (Note that the wheel is marked to show
which side faces out.) with clamp washer and spindle nut. Hold
wheel with a rag and tighten nut counterclockwise. Do not
overtighten.

6. Adjust guard band and finger guard to about 1/16" (1.6 mm) from
wheel (Fig. 27) and tighten adjusting screws.

7. Replace wheel cover.

8. For best results dress the new wheel with the diamond dresser.

Adjustments

FROM TIME TO TIME ADJUSTMENTS MAY BE NECESSAR Y DUE
TO WEAR OR SEVERE HANDLING OF THE UNIT DURING
SHIPMENT OR MOVEMENT FROM PLACE TO PLACE. SHOULD
ADJUSTMENTS BECOME NECESSARY, THE FOLLOWING
PROCEDURES SHOULD BE FOLLOWED CAREFULLY TO
INSURE PROPER AND SAFE OPERATION OF YOUR
SHARPENER.

UNPLUG TOOL BEFORE MAKING ANY ADJUSTMENTS.

1. Looseness in Pivot Rod Bearing System (Fig. 25.)

A. Set selector lever to “S” (Sharpen).
B. Position swinghead with locator approximately 1/8” (3 mm)

above wheel.

C. Loosen both front bearing gib screws until slight side play in

pivot is evident.

D. While rocking swinghead, adjust back bearing gib screw until

very slight pivoting resistance is felt. Back off screw 1/8 to 1/4
turn.

E. Adjust front bearing top and bottom gib screws evenly, while

rocking swinghead, until slight pivoting resistance is felt.

2. Latch Adjustment (Fig. 26)

A. Move swinghead to sharpening position.

English

FIG. 24

SPINDLE

NUT

CLAMP

WASHER

CHUCK

KNOB

SHARPEN/DRESS

SELECTOR

BACK

BEARING

GIB

SCREW

FRONT

BEARING

GIB

SCREW

(TOP)

FRONT BEARING GIB

SCREW (BOTTOM)

PIVOT ROD

CHUCK

RETAINING

SCREW

SWING-

HEAD

FIG. 25

FEED KNOB

RETAINING SCREW

DW751/385103 5/2/02 12:51 PM Page 8

B. Loosen chuck retaining set screw with 1/8" (3 mm) allen wrench

until chuck and detent spring can be removed from swinghead.

C. Adjust latch set screw with 1/16" (1.6 mm) allen wrench so that

swinghead locks firmly into sharpening position.

D. Replace detent spring (note orientation of “U” and “V” shaped

projections) and chuck.

E. Tighten set screw so that chuck is snug in swinghead but can

be easily rotated.

3. Finger Guard and Guard Band (Fig. 27)
Adjust opening between guards and wheel to 1/16" (1.6 mm) by

means of adjusting screws as shown. Maintain clearance as wheel
wears.

NOTE: This sharpener is completely adjusted at the factory.
However, due to rough handling that might occur during shipment,
slight readjustments may be necessary. Please take a few minutes to
check the adjustments of your unit.

9

English

FIG. 26

CHUCK

FELT SEAL

“V” SHAPE UP

DETENT SPRING

“U” SHAPE DOWN

CHUCK

RETAINING

SET SCREW

PLUG

LATCH SET SCREW

SWINGHEAD

CLAMP SCREW

PRESS

FIG. 27

GUARD

BAND

ADJUSTING

SCREW

GRINDING

WHEEL

FINGER GUARD

ADJUSTING

SCREW

FINGER
GUARD

GUARD

BAND

LATCH

1/16”

(1.6 MM)

1/16”

(1.6 MM)

DW751/385103 5/2/02 12:51 PM Page 9

10

PROBLEM

1. Chisel angle too great—
greater than 135°

2. Chisel angle too small—
less than 120°

3. Bit will not drill

4. Discoloration (burning)
near cutting lips

5. Flats or chatter marks
on ground surfaces

6. Large variation in lip height
(point off center)

7. Swinghead will not stay
locked in sharpening or
dressing position

8. Hard to pivot swinghead
back and forth

9. Bent locator

10.Unit getting unusually hot

English

Troubleshooting

REMEDY

Bit was not ground close enough to
locator or was positioned incorrectly, See
Step 6 under “Preparing to sharpen.”

Edge of locator was not flat against flute.
See step 6 under “Preparing to sharpen.”
Or bit was ground too close to locator.

Insufficient relief angle. See Step 6
under “Preparing to sharpen,” for proper
positioning of bit.

Material is being removed too fast. Slow
down feed rate.

A. Looseness in pivot rod bearing

system—see adjustments
B. Wheel needs dressing
C. Feed at slower rate
D. Slow down speed of rocking motion
A. Bent bit
B. Looseness in pivot rod bearings—

follow adjustments
C. Unequal hand pressure on

swinghead while sharpening
Latch set screw needs adjustment.

Gib screws adjusted too tight.

Place a 1/8" (3 mm) bit in chuck and
bend locator until the tip is directly over
bit center or replace locator.

Check motor air intake and exhaust
openings on bottom of tool for blockage.

4. The Locator (Fig. 28)
The locator on the chuck of your drill bit sharpener has been

inspected at the factory for proper positioning and assembly. Should
the locator edge become damaged for any reason while grinding
during the initial learning operation of the tool, it is easily replaced
with the extra locator provided.

CAUTION: Tighten screws just enough to seat locator against

chuck. DO NOT OVERTIGHTEN

FIG. 28

CHUCK

LOCATOR

SCREWS

DW751/385103 5/2/02 12:51 PM Page 10