Drill Master 500x, 750x User Manual

Model 500X

Model 750X

User’s Guide

Guía del Usuario

Mode d’emploi

500X & 750X

500X & 750X

Thank you

...for purchasing a Drill Doctor®. It is sure to become a
valuable tool because you will always have sharp drill bits
before, during, and after a project.

As President of this company, I am very proud of the qual­ity of our products—and I am equally proud of the great
people at

Professional Tool Mfg./ Drill Doctor®who

design and produce them. If you have questions or need
help with your

Drill Doctor®, please contact us and one

of our Customer Representatives will be there to help. We
support what we build!

Use this User’s Guide to learn to operate your

Drill Doc-

tor®quickly and easily. I’d also like to invite you to visit

our website at www.DrillDoctor.com. There you will find:

• Demonstrations of all operations with the sights and

sounds leading to successful drill bit sharpening

• Downloadable copies of this User’s Guide

• Warranty registration

• Service and contact numbers

Again, thank you for buying a

Drill Doctor®. Now go

enjoy its convenience and quality.

Hank O’Dougherty
President,

Professional Tool Manufacturing

www.drilldoctor.com 1

English

Contents

English...............................................................1

Important Safety Instructions...................................2

Getting to Know Your Drill Doctor®.........................9

Identifying Basic Drill Bits......................................10

Anatomy of a Drill Bit .............................................10

The Drill Doctor®Sharpening Process ..................11

Choosing Your Drill Bit Point Angle on the

Model 500X.......................................................

11

Model 750X.......................................................12

Aligning the Drill Bit...............................................12

Sharpening the Drill Bit ..........................................14

Identifying Correctly Sharpened Drill Bits..............16

Split Points..............................................................17

Creating or Replacing a Split Point.........................18

Identifying Correctly Split Bits ...............................19

Grit Tube Attachment..............................................20

Sharpening Bits of Different Lengths, Diameters and Types

Large Drill Bits .................................................20

Short Drill Bits and Bits Smaller than 1/8" ......21

Masonry Drill Bits.............................................21

Using the Variable Alignment to Adjust Chisel

and Relief Angle ...............................................

23

Using the Variable Material Take-Off on the 750X...24

Questions and Answers ...........................................25

Drill Doctor®Maintenance.....................................28

Accessories and User-Replaceable Parts.................31

Warranty .................................................................32

Español ............................................................33

Français............................................................70

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IMPORTANT SAFETY INSTRUCTIONS

For Your Own Safety Read Instruction Manual Before
Operating Tool; Wear Eye Protection.

Precautions

When using electric tools, basic safety precautions should
always be followed to prevent the risk of fire, electric shock,
and personal injury.

• KEEP GUARDS IN PLACE and in working order.

• KEEP WORK AREA CLEAN. Cluttered areas and bench

invite accidents.

• DO NOT USE IN DANGEROUS ENVIRONMENT. Do not

use power tools in damp or wet locations or expose them
to rain. Keep work area well lit. Do not use tools in the
presence of flammable liquids or gases.

• KEEP CHILDREN AWAY. All visitors should be kept safe

distance from work area.

• MAKE WORKSHOP KID PROOF with padlocks, master

switches, or by removing starter keys.

• DO NOT FORCE THE TOOL. It will do the job better and

safer at the rate for which it was designed.

• USE THE RIGHT TOOL. Don’t force tool or attachment to

do a job for which it was not designed.

• USE PROPER EXTENSION CORD. 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

Drill Doctor®has a 1.75 ampere rating

(.4 ampere in E.U; .74 ampere in Japan). Therefore, when
choosing an extension cord, please select cords of the fol-

lowing gauge:

—a 25 foot cord must be at least 18 gauge
—a 50 foot cord must be at least 16 gauge
—a 100 foot cord must be at least 14 gauge

—a 150 foot cord must be at least 12 gauge
If in doubt use a heavier gauge. The smaller the gauge
number, the heavier the gauge.

•

WEAR PROPER APPAREL. Do not wear loose clothing,
gloves, neckties, rings, bracelets, or other jewelry which may

www.drilldoctor.com 3

get caught in moving parts. Nonslip footwear is recommend­ed. Wear protective hair covering to contain long hair.

• ALWAYS USE SAFETY GLASSES. Also use face or dust

mask if cutting operation is dusty. Everyday eyeglasses
only have impact resistant lenses, they are NOT safety
glasses.

•

USE EAR PROTECTION DURING USE. The Drill Doc-

tor®can generate up to 91 dB [A] and 90 dB [C] noise

emissions when in operation. The

Drill Doctor®can gen-

erate up to 17.0 m/s2[RMS] vibration when in operation.

• SECURE WORK. Use clamps or a vise to hold work when

practical. It’s safer than using your hand and it frees both
hands to operate tool.

• DO NOT OVERREACH. Keep proper footing and balance

at all times.

• MAINTAIN TOOLS WITH CARE. Keep the

Drill Doc-

tor®clean for best and safest performance. Follow

instructions for maintenance and changing accessories.
Inspect cords periodically and if damaged have them
repaired by an authorized service facility. Inspect exten­sion cords periodically and replace if damaged. Keep unit
dry, clean and free from oil and grease.

• DISCONNECT TOOLS before servicing. Always discon-

nect the

Drill Doctor®when cleaning, inspecting, and

changing accessories, such as the diamond sharpening
wheel. When not in use, disconnect from the power sup­ply. Never touch internal parts of the sharpener when it is
turned on or plugged in. The rotating diamond wheel can
cause injury.

• REDUCE RISK OF UNINTENTIONAL STARTING. Make

sure switch is in the “OFF” position before plugging in.

• REMOVE ADJUSTING KEYS AND WRENCHES. Form

habit of checking to see that keys and adjusting wrenches
are removed from tool before turning it on.

• USE RECOMMENDED ACCESSORIES. Consult this man-

ual for recommended accessories. The use of improper
accessories may cause risk of injury to persons.

• NEVER STAND ON TOOL. Serious injury could occur if

the tool is tipped or if the cutting tool is unintentionally
contacted.

• CHECK DAMAGED PARTS. Before further use of the

4 www.drilldoctor.com

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 in the instruction man­ual. Have defective switches replaced by an authorized
service center. Do not use the tool if the switch does not
turn it on and off. Do not use if the grinding wheel is dam­aged. Use only grinding wheels recommended by

Drill

Doctor®.

• NEVER LEAVE TOOL RUNNING UNATTENDED; TURN

POWER OFF. Don’t leave the tool until it comes to a com­plete stop.

•

STORE IDLE TOOLS. When not in use, tools should be
stored in a dry, locked-up place out of the reach of children.

• DO NOT ABUSE THE CORD. Never yank the cord to dis-

connect it from the socket. Keep the cord away from
heat, oil and sharp edges.

• STAY ALERT. Watch what you are doing, use common

sense and do not operate the tool when you are tired.

• HAVE YOUR TOOL REPAIRED BY A QUALIFIED PER-

SON. This electric tool complies with the relevant safety
rules. Repairs should only be carried out by qualified per­sons using original spare parts; otherwise this may result
in considerable danger to the user.

Grounding Instructions

In the event of a malfunction or breakdown, grounding pro­vides a path of least resistance for electric current to reduce
the risk of electric shock. The

Drill Doctor®is equipped

with an electric cord having an equipment-grounding con­ductor and a grounding plug. The plug must be plugged into
a matching outlet that is properly installed and grounded in

accordance with all local codes and ordinances.

DO NOT MODIFY THE PLUG PROVIDED. If it does not
fit the outlet, have the proper outlet installed by a qualified
electrician.

Improper connection of the equipment-grounding con­ductor can result in a risk of electric shock. The conductor

www.drilldoctor.com 5

with installation (having an outer surface that is green with
or without yellow stripes) is the equipment-grounding con­ductor. If repair or replacement of the electric cord or plug is
necessary, do not connect the equipment-grounding conduc­tor to a live terminal.

Check with a qualified electrician or service personnel if
the grounding instructions are not completely understood, or
if in doubt as to whether the tool is properly grounded. Use
only 3-wire extension cords that have 3-prong grounding
plugs and 3-pole receptacles that accept the tool’s plug.
Repair or replace damaged or worn cord immediately.

USA Only

This tool is intended for use on a circuit that has an outlet
that looks like the one illustrated in Figure A following. It
has a grounding plug that looks like the one in Figure B fol­lowing. A temporary adapter, which looks like the adapter
illustrated in Figures C & D following, may be used to con­nect this plug to a 2-pole receptacle as shown in Figure D if
a properly grounded outlet is not available. The temporary
adapter should be used only until a properly grounded outlet
can be installed by a qualified electrician. The green-colored
rigid ear, lug, and the like, extending from the adapter must
be connected to a permanent ground such as a properly
grounded outlet box.

Fig. A

Fig. B

Fig. C

Fig. D

Cover of

Grounded

Outlet Box

Cover of

Grounded

Outlet Box

Grounding Pin

Grounding

Means

Metal Screw

Adapter

6 www.drilldoctor.com

1.

Read all these instructions before attempting to operate

this product and save these instructions

2. Guard against electric shock, avoid body contact with

earthed or grounded surfaces.

3. Use the right tool, do not force small tools to do the job

of a heavy duty tool, do not use tools for purposes not

intended ( for example do not use this unit to sharpen

anything other than standard twist bits)

4. Use marked outdoor extension cord leads when the tool

is used outdoors.

Safety Markings

15,000 RPM 110-120V – 60Hz – 1.75A max / 0.77A nom

-or- 220-230V – 50Hz – 0.88A max / 0.4A nom
AC Only All electrical symbols

Tool mass including detachable parts.

DD500X/750X Mass: 2.65 lb = 1.202 kg

DECLARED DUAL-NUMBER NOISE EMISSION

VALUES in accordance with ISO 4871

Declared noise emission value:

Ld = L + K, where the maximum K = 3.0 dB (per ISO 11201)

Manufacturer: Professional Tool Mfg.
Model: DD500X/750X
Rated Input: 89w Hz: 60 Source: 115VAC

A-weighted emission sound pressure level, LpA
(ref. 20 µPa) at the operator’s position, in decibels:

Un-Loaded : 84.1 Loaded : 86.8
Uncertainty, KpA, in decibels: 3.0
At 1m Distance: Un-Loaded: 81.2 Loaded: 81.2

Peak C-weighted emission sound pressure level,
L

pC,peak (ref. 20 µPa) at the operator’s position, in decibels:

Un-Loaded : 81.2 Loaded : 91.4
Uncertainty,

KpC,peak

, in decibels: 3.0

At 1m Distance: Un-Loaded: 81.7 Loaded: 84.1

www.drilldoctor.com 7

DECLARED DUAL-NUMBER NOISE EMISSION

VALUES in accordance with ISO 4871

Declared noise emission value:

L

d = L + K, where the maximum K = 3.0 dB (per ISO 11201)

Manufacturer: Professional Tool Mfg.
Model: DD500X/750X
Rated Input: 92w Hz: 50 Source: 230VAC

A-weighted emission sound pressure level, L

pA

(ref. 20 µPa) at the operator’s position, in decibels:

Un-Loaded : 76.9 Loaded : 89.7
Uncertainty, KpA, in decibels: 3.0
At 1m Distance: Un-Loaded: 71.9 Loaded: 76.0

Peak C-weighted emission sound pressure level,
L

pC,peak (ref. 20 µPa) at the operator’s position, in decibels:

Un-Loaded : 77.4 Loaded : 87.8
Uncertainty,

KpC,peak

, in decibels: 3.0

At 1m Distance: Un-Loaded: 72.7 Loaded: 75.0

Ref-0072

WARNING:

Some dust created by power sanding, grinding, miscella­neous construction activities, as well as contents from the
machine including the molding, wiring, grinding wheel, or
any other parts may contain chemicals known to the State
of California to cause cancer, birth defects or other repro­ductive harm and can be hazardous to your health.

WARNING: DO NOT EXPOSE TO RAIN
OR USE IN DAMP LOCATIONS.

8 www.drilldoctor.com

Installation

• Carefully unpack the Drill Doctor®Drill Bit Sharpener

and set it on a table or workbench. Check to see that no
damage has occurred during shipment. Check all pack­ing material to be sure that all parts are present (see
the part identification diagram in this User’s Guide).
See User’s Guide for part identification diagram.

• This tool is completely assembled; the

Drill Doctor

®

only needs to be placed on a flat stable tabletop.

• Connect to properly wired outlet.

Service

For service in the USA, contact:

Professional Tool Manufacturing

210 E. Hersey St.
Ashland, OR 97520
USA

Phone: [phone]
FAX: [phone]
Email: [e-mail]

For service in Canada, contact:

DARPRO

115-A, De Vaudreuil, Local 2
Boucherville, Quebec
Canada J4B 1K7

Phone: [phone]
FAX: [phone]
Email: [e-mail]

Outside North America, contact:

Ets V Dehaye sa-nv Brinkmann + Wecker GmbH

Rue G Moreaustraat, 57 Postfach 6106
B-1070 Brussels Einsteinstr 8
Belgium D-33104 Paderborn

Phone: [phone] Germany
FAX: [phone] Phone: [phone]
Email: [e-mail] FAX: [phone]

Email: [e-mail]

www.drilldoctor.com 9

Getting to Know Your Drill Doctor

®

Cam Guide

Sharpening Port

Power Switch

and Cord

Grit Tube

Chuck

Point Angle
Adjustment
Plate

Bit Clamp Arms

Drill Stop

Split Point Guide Rails

Split Point Port

Splitting Guide

Chuck Jaws

Chuck Knob

Cam

Adjustable Material
Take-Off (MTO) Knob

(750X Only)

Point Angle

Adjustment

Knob

Alignment Button

Wheel
Access Cover

Diamond Sharpening
Wheel (Inside)

Alignment Guides

Sharpening
Guides

Alignment
Port

Relief Angle
Settings

On 750X
MTO is here

Masonry Bit
Alignment Mark

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Identifying Basic Drill Bits

The Drill Doctor is most efficient when used to sharpen a
drill bit’s original point angle. With its standard Diamond
Sharpening Wheel it will sharpen high-speed steel, cobalt,
TiN-coated, carbide and masonry drill bits.

It has been designed and engineered to sharpen three of
the most common drill bit types and offer the ability to

customize the bit point:

Standard Point

This general-purpose point is
used for drilling softer mate­rials like cold rolled steel,

aluminum, and wood.

Split Point

Split-point bits are self-cen­tering and are generally used
for tempered steels, hard
alloys or hard cast materials.

Anatomy of a Drill Bit

Chisel Edge

It is important to understand
that each bit has all of these
characteristics.

Cutting Edge

Heel

Relief

Angle

When viewing a well-sharp­ened bit from the end, the
entire surface from the Cut­ting Edge to the Heel will
have a finely ground surface
without ridges or indenta­tions. The Heel will always
be lower than the Cutting
Edge.

Cutting Edge

Heel

Masonry Bits

Masonry bits have a carbide
insert at the point and are
used for drilling materials
like cement, brick, and
ceramic.

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The Drill Doctor®Sharpening Process

The sharpening process includes 4 easy procedures:

1. Determine the type and angle of the drill bit.

2. Align the bit in the Chuck.

3. Sharpen the bit.

4. Split the point (if you choose).

Be sure to complete the first three procedures in
order to sharpen a bit; and always sharpen a bit prior
to splitting it.

On the Model 500X

Check your drill bit angle

Most bits are 118° or 135°.
Hold your bit point up to the
key to the left to see which
type your bit looks like. If you
can’t tell due to small size or
damage on the tip, set your
Drill Doctor based on the
application. Most wood and
soft metal applications
require 118°. Harder materi­als such as stainless steel

and tool steel require 135°. If
you are drilling contoured materials (such a car fender),
plan on splitting the point.

Choosing Your Drill Bit Point Angle

When drilling into certain difficult materials, a shallower
point or 135° point angle produces a better-finished hole.
Your Drill Doctor allows you to sharpen bits with either
the standard 118° or the flatter 135° point angle. You can
also adjust the “chisel and relief angle.” (Refer to page 23
for the benefits of using Variable Alignment to adjust the
Chisel and Relief angles.)

Depending on the material you are drilling in, you may
choose to increase or decrease these angles.

1.

12 www.drilldoctor.com

On the Model 750X

Aligning the Drill Bit

This makes sure that the Drill Doctor creates the right
geometry. It also sets the bit so that only a small amount
of the tip is taken off.

(See page 21 to align and sharpen a Masonry drill bit.)

Choose the angle

The Model 750X has addi-

tional advanced features that

enable you to fine-tune your

bit geometry. Loosen the

Point Angle Adjustment

Knob to the right of the

Sharpening Port and slide the

metal Point Angle Adjust-

ment Plate to 118°, 135° or
the custom angle of your choice. Choose the point angle
based on the application (material) you’re drilling. Then
re-tighten the Knob.

Point Angle
Adjustment Knob

Choose the angle

Loosen the Point
Angle Adjustment
Knob on the right side
of the Sharpening Port
and slide the metal
Point Angle Adjust­ment Plate to either
the standard 118° or
the flatter 135° point
angle. Then re-tighten
the Knob.

Point Angle
Adjustment Knob

2.

www.drilldoctor.com 13

1.

Insert bit in Chuck and
tighten

Insert the bit into the Chuck
Jaws and close the Jaws just to
the point where the bit slides in
and out. Do not over tighten
the Chuck; the bit needs to be
able to move in and out until
Step 4. (Model 750X users
refer to “Using the Variable
Material Take-Off (MTO)” on
page 24.)

A good test to see if the Chuck
is tightened the correct amount
is to make sure it moves when
you pull on it with your fingers,
but will not fall out when you
turn the Chuck upside down.

Insert Chuck into
Alignment Port

Press the Alignment
Button down and hold it.
Match either of the
Alignment Guides on the
Chuck with the 118°
Notch on the Alignment
Port. Insert the Chuck.
While holding the button
down, slide the drill bit
forward until it touches
the Drill Stop and the
Chuck is pushed all the
way into the Alignment
Port. Release the Align­ment Button.

If you are using a Model
750X

and have chosen
a custom bit point
(between 115° and 140°),

start the alignment in the closest setting to the point angle
desired. (For example, if you are setting the point angle
below 118°, then set the alignment in the 118° setting.)
Refer to “Using the Variable Alignment to Adjust the Chis­el and Relief Angle” on page 23.

1”

Alignment Button

Drill Bit
Stop

118°

2.

Alignment

Guide

14 www.drilldoctor.com

Tighten Chuck

Hold onto the Chuck and
tighten the Chuck Knob.
(Avoid over-tightening the
Chuck in the Alignment Port;
this could damage the Chuck
and Port.)

Remove and re-tighten

Press the Alignment Button
and remove the chucked drill
bit. Tighten the Chuck once
more to ensure the bit won’t
move when you sharpen it.

You are now ready to sharpen
the drill bit.

5.

Sharpening the Drill Bit

Before sharpening you should know:

•

Keep the Cam in contact with the Cam Guide as you
sharpen

—push the Chuck straight into the Port.

• Only

light pressure is required.

4.

Adjust Bit Position

Look at your bit and make
sure the Bit Clamp Arms are
in the bit’s narrowest spot. If
not, turn the bit in the chuck
so that it is held by the Bit
Clamp Arms at the narrowest
width. This is important
because this setting deter­mines the angle at which your
bit will be sharpened.

3.

Drill Bit Stop

Bit Clamp Arms

www.drilldoctor.com 15

1.

Cam Guide

Align Guides

Turn the Drill Doctor on.
Align either of the Sharpen­ing Guides with the Cam
Guide on the machine.

Cam

Insert Chuck and turn
until the bit is sharp

Insert the Chuck in the
Sharpening Port. Making
sure you keep the Cam
against the Cam Guide,
rotate the Chuck one half­turn in a clockwise direc­tion—from Sharpening Guide
to Sharpening Guide—an
EVEN number of times. Your

motion should be smooth and

even. To sharpen both sides of the bit evenly, always use

an

even number of half-turns. The number of turns need-

ed to sharpen the bit depends on the size.
Turn the Chuck an

even number of half-turns with light

inward pressure:

• 3/32-inch bits—use 2 to 4 half-turns,

• 1/8-inch bits—use 4 to 6 half-turns,

• 3/8-inch bits—use 16 to 20 half-turns.
Note: Use just enough pressure to keep the Cam against

the Cam Guide. Let the machine do the sharpening.

Sharpening

Guide

2.

• You will hear a grinding noise (zzzzzzzzz) as you

complete each half-turn and each side of the bit face is
ground.

• The Chuck will rock as you turn it and the Cam rides

on the Guide.

Cam
Against
Cam Guide

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Identifying Correctly Sharpened
Drill Bits (and what to do with
those that aren’t!)

Correctly Sharpened Bits

The entire surface from the
Cutting Edge to the Heel will
have a finely ground surface
without ridges or indenta­tions. The Heel will always
be lower than the Cutting
Edge. The Chisel Edge will be
clean and straight.

Problem

Cause

Chuck Jaws did not grip drill
bit properly in the aligning
process.

Solution

Realign the bit by carefully
following steps 1 through 5
on pages 12 to 14.

Problem

The Chisel Edge is
not clean or
straight.

Cause

The bit isn’t completely ground yet.

Solution

Continue sharpening the bit until
the chisel is clean and straight. If
the machine quits removing mate­rial before the chisel is clean, re­align and sharpen again. (Model
750X users can increase or
decrease MTO (Material Take-Off)
to speed up this process.

Chisel Point

Cutting Edge

Heel

The Chisel Edge
is ground flat.

Incorrectly Sharpened Bits

www.drilldoctor.com 17

Cutting Edge

Heel

Relief Angle

Problem

Cause

Drill bit alignment.

Solution

Re-align the drill using the
Adjustable Alignment proce­dure on page 23. To increase
relief, insert the alignment
guide on the chuck closer to
the (+) side of the alignment
port, then sharpen the bit.

Insuffecient (Negative)
relief or a slow cutting
drill bit.

Cause

Chuck too loose or too much
pressure when sharpening.

Solution

Use more torque when tight­ening the Chuck or less pres­sure when sharpening. Clean
the Chuck w/ compressed air
if the problem persists.

Bit backing out or
slipping out of the
jaws when you are
sharpening

Problem

Split Points

Split point drill bits prevent “walk-around” on the materi­al before they begin to cut.

This feature is described as self-centering. The need to
center punch is effectively eliminated. A standard drill bit
chisel point has to wear an area in the middle of the hole
to be drilled before the cutting edges will remove material.
Due to additional cutting lips along the chisel edge, a split
point will begin cutting immediately. Up to 70% less
thrust (when compared to a non-split or conventional
point) is required to drill a hole with a split point.

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Creating or Replacing a Split Point

Leave bit in Chuck after
sharpening

Always align and sharpen a
bit before splitting it. To split
the point, do not remove the
bit from the Chuck after
sharpening.

When splitting a 135° drill
bit, align in the 118° position,
and then sharpen in the 135°
point angle position.

1.

Align Guides

Align one of the Sharpening
Guides on the Chuck (short
white marks) with the Split­ting Guide on the Splitting
Port. Make sure the Align­ment Guides insert into the
Split Point Guide Rails in the
Splitting Port.

2.

Split the point

Press Chuck slowly and firm­ly into the Splitting Port until
it stops. Remove the chuck,
rotate one-half turn, and
repeat.

Check the tip of the bit care­fully to determine that both
sides of the bit are split
equally. Compare it to the
illustrations. If it does not
match, study the information
following.

3.

Splitting Guide

Sharpening

Guide

www.drilldoctor.com 19

Split lines are nearly straight
across.

Identifying Correctly Split Drill Bits

(And What to Do With Those That Aren’t!)

Correctly Split

Solution

More grinding is needed for
larger drill bits. If one side of
the bit is undersplit, insert
the Chuck into the Splitting
Port again and split both
sides. Push the Chuck into
the Port until it stops. Repeat
until the split sides are equal
and look like the correctly
split bit shown above.

Undersplit

Oversplit

Solution

Reinsert the chucked bit into
the Sharpening Port and
remove enough of the tip
until the split tip looks like
the correctly split bit above.

Too much material
removed. Split lines are
joined in the center and
Chisel Edge has been
removed.

Split lines do not meet in
the center but Chisel
Edge remains.

Split line

Not enough material has
been removed from the
Heel of the drill bit.

20 www.drilldoctor.com

Grit Tube Attachment

The Grit Tube attachment
is designed to keep any
sparks caused by sharpen­ing safely inside the
machine and away from
you. In addition, the Grit
Tube reduces the sharpen­ing dust in the air and on
your workbench.

Simply insert the Grit Tube into the Splitting Port of your
Drill Doctor

®

when sharpening. It will catch the grit that
is formed from the sharpening process. Clean the inside of
your Drill Doctor®and the Grit Tube on a regular sched­ule. The Grit Tube is designed to accept a standard 1"
shop vacuum for extended periods of sharpening.

Sharpening Bits of Different Lengths,
Diameters, and Types

Drill Bits of Different Sizes

Too many rotations of a small-diameter bit may result in
incorrect sharpening and too few on a large-diameter bit
may not sharpen enough. Continue to sharpen until the
Chisel Edge is clean and straight and the entire surface
from the Cutting Edges to the Heel is finely ground.

• 3/32-inch bits — use 2 to 4 half-turns,

• 1/8-inch bits — use 4 to 6 half-turns,

• 3/8-inch bits — use 16 to 20 half-turns.

Large Drill Bits

The Model 500X sharpens bits from 3/32" to 1/2". (You
can also purchase a Large Bit Chuck that sharpens bits up
to 3/4".) The Model 750X comes equipped with that
Large-Bit Chuck. It sharpens bits from 3/32" to 3/4".

Large bits are sharpened just like any other bit.
It is important to sharpen these bits so that the entire face

of the drill bit is sharpened. A large bit requires more
pressure and will require more half-turns to sharpen it.

www.drilldoctor.com 21

Short Drill Bits and Bits Smaller than 1/8”

Set the point angle for 118°. Put the bit into the Chuck as
normal, but tighten Chuck so that it is just snug enough
for the bit to move freely. Push and hold the Alignment
Button. Partially insert the Chuck into the Alignment
Port, but do not push the Chuck all the way in. Use the
Chuck Knob to rotate the bit until it can be held by the Bit
Clamp Arms in the narrowest width of the bit. Make sure
that the bit is touching the Drill Stop, and then release the
Alignment Button. Turn the Chuck until the Alignment
Guide on the Chuck aligns with the 118º notch on the
Alignment Port. Now, push the Chuck in the rest of the
way. Tighten the Chuck, remove, and tighten again.

Sharpen the small bit as usual.

Aligning and Sharpening Masonry Drill Bits

To sharpen a masonry bit, you do not turn the Chuck.
Instead you insert the Chuck until it touches the wheel,
remove, and repeat on the other side.

1.

Set the point
angle to 118°.

Bits 1/2" or larger will need a minimum of 40 half turns. A
3/4" bit may require up to 60 half turns. It may take two
or three complete sharpenings (repeat all steps) to re­sharpen a very dull or chipped large drill bit.

Your Drill Doctor

®

is delivered with a 180-grit Diamond
Sharpening Wheel. If you regularly sharpen larger bits
between 1/2" and 3/4", you may wish to purchase the
coarser 100-grit Diamond Sharpening Wheel, which
sharpens larger bits faster.

22 www.drilldoctor.com

3.

Set the depth

Set the depth by lining up the
Sharpening Guide with the Cam
Guide. Push the Chuck into the
Sharpening Port until it stops and
tighten the Chuck. Remove the
Chuck to ensure the carbide insert

is aligned with the
Masonry Sharpen­ing Marks and
tighten again.

Sharpen by “plunging”

Line up the Sharpening Guide on
the Chuck with the Cam Guide
on the machine. Plunge the
Chuck into the Sharpening Port
until it touches the Sharpening
Wheel. Remove the Chuck,
rotate

one half-turn clockwise

and repeat the plunge action.
Start with four (4) plunges and
always use an

even number.

Inspect the bit and continue until the cutting surfaces are
sharp. If the bit stops grinding before the edges are sharp,
loosen the Chuck, push the bit out slightly. Make sure car­bide insert is still aligned with Masonry Sharpening Marks.
Tighten the Chuck, and continue sharpening.

2.

Align the bit with the Masonry
Sharpening Marks

Insert the bit into the Chuck and line
up the carbide insert on the tip of the
bit so that it is parallel to the Mason­ry Sharpening Marks on the end of

the chuck. Leave about
1/2"-5/8" of bit stick­ing out past the nose of
the chuck. Tighten the
chuck just to the point
that the bit slides in
and out.

Cam Guide

Cam

Sharpening Guide

Masonry
Sharpening Marks

4.

Cam
Guide

Cam

Carbide Insert

www.drilldoctor.com 23

Using the Variable Alignment to Adjust
the Chisel and Relief Angles

Both Models 500X and 750X enable you to adjust the
Chisel and Relief Angles of your drill bit. The Chisel and
Relief Angles have a direct effect on the performance of
your drill. By increasing the Relief Angle, you can
increase the speed of the drill in softer materials. To
improve the quality of the hole, you can adjust the drill to
be less aggressive. A less-aggressive drill has a lower
Chisel and Relief Angle. Your Drill Doctor enables you to
adjust both angles in one setting.

Chuck bit as usual

To prepare your bit for this
fine adjustment, follow all
the steps for chucking your
bit given previously in this
User’s Guide.

1.

Insert Chuck into
Alignment Port

To adjust the Chisel and
Relief Angles, simply align
the bit as usual with the fol­lowing adjustment;

To increase Relief—position
the Chuck in the Alignment
Port so that the Alignment
Guide is closer to the (+)
position. This will make a
more aggressive drill point.

To decrease Chisel and
Relief

—position the Chuck in
the Alignment Port so that
the Alignment Guide is closer

to the (-) position. This will make a more precise hole.
Take care not to adjust the Relief too far as this will actu­ally cause the drill to lose all Relief and therefore not drill
a hole. Each notch in the Alignment Port is approximately
a 10° change in Chisel Angle.

2.

Alignment
Port

1”

118°

-

+

24 www.drilldoctor.com

Adjust bit position,
tighten Chuck, and
sharpen as usual

Refer to pages 12-14 for
these steps. Experiment with
a few different settings to
find the one that best suits
your drill bits and applica­tion. You may find it helpful
to mark this setting for
future use.

3.

Using the Variable Material Take-Off (MTO)

The Model 750X enables
you to remove more or less
material from the tip of your
bit when you sharpen. If
your bit is only slightly dull
and you simply wish to
“touch up” its point, turn the
Material Take-Off (MTO)

Knob

clockwise to reduce the amount of time it takes to

sharpen the bit. If your drill bit is quite dull or damaged,
turn the MTO Knob counter-clockwise to increase the
amount of material removed. The MTO adjusts from 0 to
.040 of an inch in increments of .005". Prior to aligning the
bit, turn the MTO Knob

counter-clockwise until it stops.

(This is the maximum material that can be removed in one
sharpening.) Then turn it

clockwise 3 marks on the MTO

knob. This is a good place to start for most bits.
Now turn the MTO knob either direction to adjust the

desired MTO. Each mark on the MTO knob is equal to a
.005" change in material removed from the bit each time it
is sharpened.

Note: After you have sharpened your bits on the Drill Doc­tor

®

at least one time, it is desirable to turn the MTO Knob
such that only a small amount of material is removed from
the bit each time it is sharpened. This will significantly
decrease the time to sharpen as well as extend your bit and
wheel life. Once you’ve made your adjustment, align and
sharpen your bit as usual.

Variable Material
Take-Off Knob

www.drilldoctor.com 25

Questions and Answers

1. Question:

Why was my drill bit sharpened improperly?

Answer:

The most common cause of improper sharpening is drill
bit alignment.

Key causes are:

1. Chuck not pushed all the way into the Alignment Port.

2. Drill not aligned in the Chuck Jaws correctly.

3. The type of drill requires an angle adjustment to

achieve the desired Chisel and Relief Angles. Try using
the Variable Alignment to adjust the Chisel and Relief
Angle (see page 23).

4. Chuck is dirty or the bit slipped out of alignment. See

page 29, “Cleaning the Chuck.”

5. Too many rotations of a small-diameter bit results in

incorrect sharpening — and too few on a large bit may
not sharpen enough. See page 20, “Drill Bits of Differ-

ent Sizes.”

2. Question:

When I aligned the drill bit and sharpened it, why was
no material removed?

Answer:

This happens when the bit is not protruding out of the
Chuck far enough. You may have allowed the Alignment
Button to knock the drill back into the Chuck when align­ing the bit. Carefully realign the bit in the Alignment Port
again. Make sure the drill bit is pushed all the way against

the Drill Stop before you release the Alignment Button.

3. Question:

I sharpened the bit. Why won’t it cut?

26 www.drilldoctor.com

Answer:

This happens when the Heel on the bit is higher than the
Cutting Edge (negative relief). To correct this problem,
follow the instructions in “Using the Variable Alignment to
Adjust the Chisel and Relief Angle” (page 23).

Also, you may have a specialty drill bit. Slow and Fast Spi­ral, Helix, Turbo Flutes, and Raised Margin drill bits are
considered specialty bits. If you are getting insufficient
relief on specialty bit types, try aligning all the way in the
(+) setting on the Alignment Port. This will help improve
the sharpening on these types of bits.

4. Question:

What can I do about flat spots on the bit point between
the Cutting Edge and the Heel?

Answer:

The flat spots on a sharpened bit are the result of an
incomplete or paused half-turn of the Chuck in the Sharp­ening Port. To correct, apply light, inward pressure and
rotate the Chuck smoothly while sharpening. Be sure to

complete the half-turns.

5. Question:

Why is the drill point off center?

Answer:

If the tip of the drill bit appears to be sharpened off center,
check the following items:

• You may not have done an

EVEN number of half-turns

when you sharpened, resulting in one face of the bit
being ground more than the other. Always use an

even

number of half-turns when you sharpen.

• Make sure that there are no particles between the

Chuck Jaws and the drill bit that could hold it off cen­ter. Check the bit to ensure it is straight and free of
burrs.

• Make sure the bit is not loose in the Chuck.

• During the sharpening process be sure to keep the

same pressure on each half-turn.

www.drilldoctor.com 27

6. Question:

Why is the chisel edge on my drill bit flat?

Answer:

During the alignment process the Bit Clamps were grip­ping the high points of the drill bit. Realign the drill bit
making sure that the Bit Clamps are located in the nar-

rowest section of the bit. See page 14.

7. Question:

Why was my drill bit sharpened improperly?

Answer:

The most common cause of improper sharpening is
improper drill bit alignment.

Key causes are:

1. Drill point not pushed all the way to the Drill Stop.

2. Chuck not pushed all the way into the Alignment Port.

3. Drill not aligned in the Bit Clamps correctly.

In order to correct these problems be sure the Chuck is all
the way in the Alignment Port. The drill point must be
against the Drill Stop and the Bit Clamps must be at the
narrowest part of the drill bit.

8. Question:

Why is my split point uneven?

Answer:

Page 19 shows a drill point that is undersplit and a drill
point that is correctly split. To correct an uneven point
split, insert the Chuck into the Splitting Port and split
both sides again. Push the Chuck into the Port until it
stops. Repeat until the split sides are equal and look like
the correctly split bit shown above.

28 www.drilldoctor.com

9. Question:

Why does the drill bit back up into the Chuck during
the sharpening procedure?

Answer:

Make sure the bit is tight in the Chuck before sharpening.
Your Chuck may be dirty. Follow the steps for cleaning the
Chuck on page 29.

10. Question:

When splitting, why don’t I hear a grinding sound?

Answer:

The Chuck is not seated properly in the Splitting Port. The
Chuck’s Sharpening Guide must line up with the Splitting
Guide on the top of the Split Point Port. Firmly and slowly
push the Chuck into the hole until the grinding sound

stops.

11. Question:

Can I change a 135° drill bit into a 118° drill bit?

Answer:

You can change the degree angle of any drill bit from 135°
to 118°. The alignment and sharpening procedure will
need to be performed three (3) or more times to remove
the old angle and produce the new angle desired.

Drill Doctor Maintenance

After sharpening 20 to 25 drill bits, the drill bit grinding
dust will accumulate in the grinding compartment. Grind­ing particles will promote wear in the Sharpening Port
and Chuck, so cleaning on a consistent basis can add life
to your machine. Before any maintenance or cleaning is
performed, be sure to disconnect your Drill Doctor

®

.

Removing the Wheel Access Cover

With the Drill Doctor®unplugged, use your fingertip to
pull down the Wheel Access Cover — it will come com­pletely off for easy access. To close, insert the Cover in the
slots and snap it back into place.