Chicago Electric 91674 User manual

®
Model 91674
ASSEMBLY AND OPERATING INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our Web site at: http://www.harborfreight.com
Copyright 2004 by Harbor Freight Tools®. All rights reserved. No portion of this
manual or any artwork contained herein may be reproduced in any shape or form
without the express written consent of Harbor Freight Tools.
For technical questions, please call 1-800-444-3353.
ELECTRIC DRILL BIT
AND CHISEL SHARPENER

SKU 91674 For technical questions, please call 1-800-444-3353. Page 2
PRODUCT SPECIFICATIONS
SAVE THIS MANUAL
You will need this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures, parts list and as-
sembly diagram. Keep your invoice with this manual. Write the invoice number
on the inside of the front cover. Keep this manual and invoice in a safe and dry
place for future reference.
GENERAL SAFETY RULES
WARNING!
READ AND UNDERSTAND ALL INSTRUCTIONS
Failure to follow all instructions listed below may result in
electric shock,fire,and/or serious injury.
SAVE THESE INSTRUCTIONS
WORK AREA
1. Keep your work area clean and well lit. Cluttered benches and dark areas
invite accidents.
2. Do not operate power tools in explosive atmospheres, such as in the
presence of flammable liquids, gases, or dust. Power tools create sparks
which may ignite the dust or fumes.
3. Keep bystanders, children, and visitors away while operating a power tool.
Distractions can cause you to lose control. Protect others in the work area from
debris such as chips and sparks. Provide barriers or shields as needed.
Power 120 Volts, 50 Watts, 1726 RPM
Overall Dimensions 10” L x 6-1/4” W x 5-1/2” H
Work Table Dimensions 3-3/4” L x 2-1/4” W x 1-3/4” H
Sharpening Stone Size 3/4” H x 3-5/16” Dia.
Chisel Sharpening Capacity: At various angles from +/- 40o
Bit Sharpening Capacity: 3.6mm (9/16”), 4mm (5/32”), 4.3 mm,
4.6mm (11/64”), 5mm (3/16”), 5.3mm (13/64”), 5.6mm (7/32”), 6mm (15/64”),
6.5mm (1/4”), 7mm (17/64”), 7.5mm (19/64”), 8mm (5/16”), 8.5mm (21/64”),
9mm (11/32”), 9.5mm (3/8”),10mm (25/64”).

SKU 91674 For technical questions, please call 1-800-444-3353. Page 3
ELECTRICAL SAFETY
4. Grounded tools must be plugged into an outlet properly installed and
grounded in accordance with all codes and ordinances. Never remove the
grounding prong or modify the plug in any way. Do not use any adapter
plugs. Check with a qualified electrician if you are in doubt as to whether
the outlet is properly grounded. If the tools should electrically malfunction or
break down, grounding provides a low resistance path to carry electricity away
from the user.
5. Double insulated tools are equipped with a polarized plug (one blade is
wider than the other). This plug will fit in a polarized outlet only one way. If
the plug does not fit fully in the outlet, reverse the plug. If it still does not
fit, contact a qualified electrician to install a polarized outlet. Do not
change the plug in any way. Double insulation eliminates the need for the
three wire grounded power cord and grounded power supply system.
6. Avoid body contact with grounded surfaces such as pipes, radiators,
ranges, and refrigerators. There is an increased risk of electric shock if your
body is grounded.
7. Do not expose power tools to rain or wet conditions. Water entering a power
tool will increase the risk of electric shock.
8. Do not abuse the Power Cord. Never use the Power Cord to carry the tools
or pull the Plug from an outlet. Keep the Power Cord away from heat, oil,
sharp edges, or moving parts. Replace damaged Power Cords immedi-
ately. Damaged Power Cords increase the risk of electric shock.
9. When operating a power tool outside, use an outdoor extension cord
marked “W-A” or “W”. These extension cords are rated for outdoor use, and
reduce the risk of electric shock.
PERSONAL SAFETY
10. Stay alert. Watch what you are doing, and use common sense when oper-
ating a power tool. Do not use a power tool while tired or under the influ-
ence of drugs, alcohol, or medication. A moment of inattention while operat-
ing power tools may result in serious personal injury.
11. Dress properly. Do not wear loose clothing or jewelry. Contain long hair.
Keep your hair, clothing, and gloves away from moving parts. Loose
clothes, jewelry, or long hair can be caught in moving parts.

SKU 91674 For technical questions, please call 1-800-444-3353. Page 4
12. Avoid accidental starting. Be sure the Power Switch is off before plugging
in. Carrying power tools with your finger on the Power Switch, or plugging in
power tools with the Power Switch on, invites accidents.
13. Remove adjusting keys or wrenches before turning the power tool on. A
wrench or a key that is left attached to a rotating part of the power tool may result
in personal injury.
14. Do not overreach. Keep proper footing and balance at all times. Proper
footing and balance enables better control of the power tool in unexpected
situations.
15. Use safety equipment. Always wear ANSI approved eye protection. Dust
mask, non-skid safety shoes, hard hat, or hearing protection must be used for
appropriate conditions.
TOOL USE AND CARE
16. Do not force the tool. Use the correct tool for your application. The correct
tool will do the job better and safer at the rate for which it is designed.
17. Do not use the power tool if the Power Switch does not turn it on or off.
Any tool that cannot be controlled with the Power Switch is dangerous and must
be replaced.
18. Disconnect the Power Cord Plug from the power source before making any
adjustments, changing accessories, or storing the tool. Such preventive
safety measures reduce the risk of starting the tool accidentally.
19. Store idle tools out of reach of children and other untrained persons. Tools
are dangerous in the hands of untrained users.
20. Maintain tools with care. Keep cutting tools sharp and clean. Properly
maintained tools with a sharp cutting edge are less likely to bind and are easier
to control. Do not use a damaged tool. Tag damaged tools “Do not use”until
repaired.
21. Check for misalignment or binding of moving parts, breakage of parts, and
any other condition that may affect the tool’s operation. If damaged, have
the tool serviced before using. Many accidents are caused by poorly main-
tained tools.

SKU 91674 For technical questions, please call 1-800-444-3353. Page 5
22. Use only accessories that are recommended by the manufacturer for your
model. Accessories that may be suitable for one tool may become hazardous
when used on another tool. SERVICE
23. Tool service must be performed only by qualified repair personnel. Service
or maintenance performed by unqualified personnel could result in a risk of injury.
24. When servicing a tool, use only identical replacement parts. Follow
instructions in the “Inspection, Maintenance, And Cleaning” section of this
manual. Use of unauthorized parts or failure to follow maintenance instructions
may create a risk of electric shock or injury.
GROUNDING
WARNING!
GROUNDEDTOOLS:TOOLS WITHTHREE PRONG PLUGS
1. Tools marked with “Grounding Required” have a three wire cord and three prong
grounding plug. The plug must be connected to a properly grounded outlet. If
the tool should electrically malfunction or break down, grounding provides a low
resistance path to carry electricity away from the user, reducing the risk of elec-
tric shock. (See Figure A, next page.)
2. The grounding prong in the plug is connected through the green wire inside the
cord to the grounding system in the tool. The green wire in the cord must be the
only wire connected to the tool’s grounding system and must never be attached
to an electrically “live” terminal. (See Figure A.)
3. Your tool must be plugged into an appropriate outlet, properly installed and
grounded in accordance with all codes and ordinances. The plug and outlet
should look like those in the following illustration. (See Figure A.)
Improperly connecting the grounding wire can result in the risk of electric shock.
Check with a qualified electrician if you are in doubt as to whether the outlet is
properly grounded. Do not modify the power cord plug provided with the tool.
Never remove the grounding prong from the plug. Do not use the tool if the
power cord or plug is damaged. If damaged, have it repaired by a service facility
before use. If the plug will not fit the outlet, have a proper outlet installed by a
qualified electrician.

SKU 91674 For technical questions, please call 1-800-444-3353. Page 6
FIGURE A
SYMBOLOGY
Double Insulated
CanadianStandards
Association
Underwriters
Laboratories,Inc.
Volts Alternating Current
Amperes
No Load Revolutions
per Minute (RPM)
noxxxx/min.
A
V ~

SKU 91674 For technical questions, please call 1-800-444-3353. Page 7
FIGURE B
DOUBLE INSULATED TOOLS: TOOLS WITH TWO PRONG PLUGS
4. Tools marked “Double Insulated” do not require grounding. They have a special
double insulation system which satisfies OSHA requirements and complies with
the applicable standards of Underwriters Laboratories, Inc., the Canadian
Standard Association, and the National Electrical Code. (See Figure B.)
5. Double insulated tools may be used in either of the 120 volt outlets shown in the
following illustration. (See Figure B.)
EXTENSION CORDS
1. Grounded tools require a three wire extension cord. Double Insulated tools
can use either a two or three wire extension cord.
2. As the distance from the supply outlet increases, you must use a heavier gauge
extension cord. Using extension cords with inadequately sized wire causes a
serious drop in voltage, resulting in loss of power and possible tool damage.
(See Figure C, next page.)
3. The smaller the gauge number of the wire, the greater the capacity of the cord.
For example, a 14 gauge cord can carry a higher current than a 16 gauge cord.
(See Figure C.)
4. When using more than one extension cord to make up the total length, make
sure each cord contains at least the minimum wire size required.
(See Figure C.)
5. If you are using one extension cord for more than one tool, add the nameplate
amperes and use the sum to determine the required minimum cord size.
(See Figure C.)

SKU 91674 For technical questions, please call 1-800-444-3353. Page 8
6. If you are using an extension cord outdoors, make sure it is marked with the
suffix “W-A” (“W” in Canada) to indicate it is acceptable for outdoor use.
7. Make sure your extension cord is properly wired and in good electrical condition.
Always replace a damaged extension cord or have it repaired by a qualified
electrician before using it.
8. Protect your extension cords from sharp objects, excessive heat, and damp or
wet areas.
RECOMMENDED MINIMUM WIRE GAUGE FOR EXTENSION CORDS*
(120 VOLT)
NAMEPLATE
AMPERES
(At Full Load) EXTENSION CORD LENGTH
25 FEET 50 FEET 75 FEET 100 FEET 150 FEET
0 - 2.0 18 18 16 16 16
2.1 - 3.4 18 18 16 14 14
3.5 - 5.0 18 18 16 14 12
5.1 - 7.0 18 16 14 12 12
7.1 - 12.0 18 14 12 10 -
12.1 - 16.0 14 12 10 - -
16.1 - 20.0 12 10 - - -
FIGURE C *Based on limiting the line voltage drop
to five volts at 150% of the rated amperes.
SPECIFIC SAFETY RULES
1. Maintain labels and nameplates on the Sharpener. These carry important infor-
mation. If unreadable or missing, contact Harbor FreightTools for a replacement.
2. Always wear ANSI approved safety impact eye goggles and heavy work gloves
when using the Sharpener. Using personal safety devices reduce the risk for
injury. Safety impact eye goggles and heavy work gloves are available from Har-
bor FreightTools.
3. Maintain a safe working environment. Keep the work area well lit. Make sure
there is adequate surrounding workspace. Always keep the work area free of ob-
structions,grease,oil, trash, and other debris. Do notuseapowertoolin areas near
flammable chemicals, dusts, and vapors. Do not use this product in a damp or wet
location.

SKU 91674 For technical questions, please call 1-800-444-3353. Page 9
4. Always keep the extension cord away from moving parts on the tool.
5. When holding a tool to be sharpened (ie. chisel), always maintain a firm grip
on the tool with both hands to resist starting torque.
7. Avoid unintentional starting. Make sure you are prepared to begin work before
turning on the Sharpener.
8. Do not force the Sharpener. This tool will do the work better and safer at the
speed and capacity for which it was designed.
9. Do not sharpen with liquids. This tool is designed for dry sharpening only.
10. Never leave the Sharpener unattended when it is plugged into an electrical
outlet. Turn off the tool, and unplug it from its electrical outlet before leaving.
11. Always unplug the Sharpener from its electrical outlet before performing any
inspection, maintenance, or cleaning procedures.
12. Be careful of Bits when sharpening. Bits will become very hot (and sharp)during
the sharpening process. Allow them to cool before touching or storing.
13. Sharpening head may become hot during use. This is a normal condition and
no cause for alarm. Be careful when handling.
14. This tool should only be used on a flat, sturdy surface, capable of supporting
the Sharpener, any tools or accessories used, and the pressure exerted dur-
ing use.
15. WARNING! Some dust created by power sanding, sawing, grinding, drilling,
and other construction activities, contain chemicals known (to the State of Califor-
nia) to cause cancer, birth defects or other reproductive harm. Some examples of
these chemicals are: lead from lead-based paints, crystalline silica from bricks and
cement or other masonry products, arsenic and chromium from chemically treated
lumber. Your risk from these exposures varies, depending on how often you do this
type of work. To reduce your exposure to these chemicals:work in a well ventilated
area, and work with approved safety equipment, such as those dust masks that are
specially designed to filter out microscopic particles.
(California Health & Safety Code 25249.5, et seq.)
16. WARNING! People with pacemakers should consult their physician(s) before
using this product. Electromagnetic fields in close proximity to a heart pacemaker
could cause interference to or failure of the pacemaker.

SKU 91674 For technical questions, please call 1-800-444-3353. Page 10
UNPACKING
When unpacking, check to make sure all the parts shown on the Parts List on page 14
are included. If any parts are missing or broken, please call Harbor Freight Tools at the
number shown on the cover of this manual as soon as possible.
ASSEMBLY AND OPERATING INSTRUCTIONS
NOTE: For additional information regarding the parts listed in the following pages, refer
to the Assembly Diagram on page 15.
CAUTION: Always make sure the Power Cord (6) of the Sharpener is unplugged
from its electrical outlet prior to making any adjustments to the tool.
FIGURE 1 FIGURE 2
Knob(28)
AdjustingWheel(26)
Working Table (27)
Grinding Wheel (20)
Top View
AngleTable(30)
Angle Fence (30)
Screw (31)
Switch (5)
AdjustingScrew (26)
Number
Chisel Position

SKU 91674 For technical questions, please call 1-800-444-3353. Page 11
Sharpening Drill Bits
A drill bit is properly sharpened when it has the following characteristics:
Note: See FIGURE 3.
A. A sharp point in the center of the bit.
B Two, equal sharp cutting edges.
C. Two trailing edges, slightly more concave than the cutting edges.
Note: To determine exact angles of the edges, fit the bit into the Angle Divider
(32) to check specific conformities.
Refer to FIGURES 1 and 2 on page 10, and FIGURE 3 above.
Warning!! The bit will become extremely hot during the sharpening process.
Make sure you wear protective gloves, and have a suitable surface to set hot bits
on when you are finished with them.
1. Place the Sharpener on a flat, sturdy surface. Plug in the unit.
2. Collect a clean bit to be sharpened and match its size to one of the sharpening
holes on the top of the Sharpener.
3. Put the bit into the appropriate hole and twist it until it locks into place.The top of the
wheel is concave so that the bit can be slightly angled toward the number on the
hole on the top of the Sharpener. See FIGURE 2.
Note: To sharpen shorter bits, turn the AdjustingWheel (25) clockwise, to raise the
Grinding Wheel (20). Turning counterclockwise lowers the Grinding Wheel (20).
Warning!! The exposed Grinding Wheel (20) turns when sharpening bits. Make
sure your hands and fingers are clear of it.
4. Turn the unit on while exerting slight downward hand pressure onto the bit. Turn the
unit off after five to ten seconds.
Warning! Do not let the bit overheat.If the tip of the bit begins to turn blue, then it is
overheating. Ifthat happens, reducetheamountof pressure andsharpeningtime. If
necessary, cool the bit in water between sharpening.Make sure it is thoroughly dry
before putting it back in the shapener.
5. Examine the bit with the following things in mind.
a. If one edge is longer that the other and the point is not centered, sharpen the
shorter side for a little more time. To prevent this from happening, sharpen both
sides the same amount of time using equal pressure.
FIGURE 3
Center Point
Cutting Edge
Trailing Edge
Rotation direction of bit

SKU 91674 For technical questions, please call 1-800-444-3353. Page 12
Sharpening Drill Bits (continued)
Using the GrindingWheel (20) to Sharpen Chisels
ALWAYS UNPLUG THE UNIT BEFORE ADDING OR REMOVING ATTACHMENTS.
1. Slide the Working Table (27) onto the front of the unit and tighten the Knob (28) to
hold it firmly in place. See FIGURE 4.
2. For different angles, adjust theAngle Fence (30) byloosening the Screw (31), mov-
ing the Angle Fence (30) to the desired angle, and tightening the Screw (31). See
FIGURE 5.
Note: Most chisels have a flat side that would not be sharpened.
3. Turn on the unit. While wearing work gloves and maintaining a firm grip on the tool,
place the tool to be sharpened against the Angle Fence (30) and gently make con-
tact with the Grinding Wheel (20). Refer to FIGURE 1. Grind the Chisel until a
consistent,sharpedge is achieved. Check your progress every 10 seconds. Do not
over-grind.
Note: If necessary, by turning the Adjusting Wheel (25) clockwise, the Grinding
Wheel (20) raises. Turning counterclockwise lowers the Grinding Wheel (20).
FIGURE 4 FIGURE 5
Working Table
Screw (31)
AngleFence (30)
Note:To avoid kick-back, always grind to the left
Knob(28)
Working Table (27)
b. If the bit you are sharpening is extremely dull to begin with, rough it into shape
on a bench grinder before using the sharpener.
6. Repeat the process on both sides of the bit. Always turn off the unit before re-
moving bits. To sharpen the other side, twist the bit to release it from the hole, turn
it half way around, and lock it back into the Sharpener. Sharpen both sides the
same amount of time using equal pressure.
7. Repeat the above steps as necessary to sharpen bits.
8. When finished, turn off the unit, remove the bit, and unplug the unit.

SKU 91674 For technical questions, please call 1-800-444-3353. Page 13
Using the Grinding Wheel (20) (continued)
4. When finished, turn off the unit and unplug it from the power source.
Changing the GrindingWheel (20)
MAKE SURE THAT THE UNIT IS SHUT OFF AND UNPLUGGED
BEFORE CHANGING THE GRINDING WHEEL.
1. Take the top section off of the unit by removing the four Screws (13).
See FIGURE 6.
2. Remove the Grinding Wheel (20), the Wheel Base (19), Fixing Plate (21) and the
Adjusting Screw (22). See FIGURE 7.
3. Use two wrenches (not included) to loosen the Grinding Wheel (20) from the
assembly as shown in FIGURE 8. Note: The assembly is reverse threaded so
you will have to exert downward pressure on both sides. Be aware of its position
and exactly duplicate it with the new wheel.
4. Replace the Grinding Wheel (20). Grinding wheels are available from Harbor
Freight Tools. Re-assemble the Grinding Wheel (20), the Wheel Base (19),
Fixing Plate (21) and the Adjusting Screw (22). Replace the assembly and screw
on the top of the unit.
INSPECTION, MAINTENANCE, AND CLEANING
1. WARNING! Make sure the Switch (5) of the Sharpener is in its “OFF” posi-
tion and that the tool is unplugged from its electrical outlet before performing any
inspection, maintenance, or cleaning procedures.
2. BEFORE EACH USE, inspect the general condition of the Sharpener. Check for
loose screws, misalignment or binding of moving parts, cracked or broken parts,
damaged electrical wiring, and any other condition that may affect its safe opera-
tion. If abnormal noise or vibration occurs, have the problem corrected by a
qualified technician before further use. Do not use damaged equipment.
3. Wipe down the unit with a lint free cloth.
4. Make sure the air vents are free of foreign matter at all times.
Reversethreaded
Screw(13)
Adjusting
Screw
(22)
GrindingWheel(20)
WheelBase (19)
RemoveTop
FIGURE 6 FIGURE 7 FIGURE 8

SKU 91674 For technical questions, please call 1-800-444-3353. Page 14
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDEDTHE PARTS LIST AND ASSEMBLY
DIAGRAM INTHIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR
DISTRIBUTOR MAKESANY REPRESENTATIONORWARRANTYOF ANYKINDTOTHEBUYERTHAT
HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS
QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/
ORDISTRIBUTOREXPRESSLY STATESTHATALLREPAIRSAND PARTSREPLACEMENTSSHOULD
BE UNDERTAKEN BY CERTIFIED AND LICENSEDTECHNICIANS, AND NOT BYTHE BUYER. THE
BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE
ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR HER
INSTALLATION OF REPLACEMENT PARTS THERETO.
PLEASE READ THE FOLLOWING CAREFULLY
PARTS LIST
Part No. Description Qty.
1 Screw 4
2 Pad 4
3 Base 1
4 Capacitor 1
5 Switch 1
6 Power Cord 1
7 Motor 1
8 E-Nut 1
9 Fan 1
10 Body 1
11 Washer 4
12 Screw 4
13 Screw 6
14 MaleConnector 1
15 Drive Spindle 1
16 Bearing 1
17 Spring 1
18 Wheel Cover 1
19 Wheel Base 1
20 Grinding Wheel 1
21 Fixing Plate 1
22 AdjustingScrew 1
23 DepthRing 1
24 Guide Block 1
25 Screw 2
26 AdjustingScrew 1
27 WorkingTable 1
28 Knob 1
29 Slider 1
30 AngleFence 1
31 Screw 1
32 Angle Divider 1
33 Screw 1
34 Washer 1
35 Washer 4

SKU 91674 For technical questions, please call 1-800-444-3353. Page 15
NOTE: Some parts are listed and shown for illustration purposes only, and are not avail-
able individually as replacement parts.
ASSEMBLY DIAGRAM