Chicago Electric 90287 User manual

DRILL BIT SHARPENER
Model 90287
SET UP AND OPERATING INSTRUCTIONS
Visit our website at: http://www.harborfreight.com
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright©2003 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. Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein. Tools required for
assembly and service may not be included.
For technical questions or replacement parts, please call 1-800-444-3353.
Cover revised 09j

Page 2 For technical questions, please call 1-800-444-3353. SKU 90287
SAVE THIS MANUAL
Keep this manual for the safety warnings
and precautions, assembly, operating,
inspection, maintenance and cleaning
procedures. Write the product’s serial number
in the back of the manual near the assembly
diagram (or month and year of purchase if
product has no number). Keep this manual
and the receipt in a safe and dry place for
future reference.
IMPORTANT SAFETY
INFORMATION
In this manual, on the labeling, and
all other information provided with
this product:
This is the safety alert
symbol. It is used to alert
you to potential personal
injury hazards. Obey all
safety messages that follow
this symbol to avoid possible
injury or death.
DANGER indicates a
hazardous situation
which, if not avoided, will result
in death or serious injury.
WARNING indicates a
hazardous situation
which, if not avoided, could
result in death or serious injury.
CAUTION, used with
the safety alert
symbol, indicates a hazardous
situation which, if not avoided,
could result in minor or moderate
injury.
NOTICE is used to
address practices not
related to personal injury.
CAUTION, without the
safety alert symbol, is
used to address practices not
related to personal injury.
General Power Tool Safety Warnings
WARNING Read all safety warnings
and instructions. Failure to follow the
warnings and instructions may result
in electric shock, re and/or serious
injury.
Save all warnings and instructions
for future reference.
The term ″power tool″ in the warnings
refers to your mains-operated (corded)
power tool or battery-operated
(cordless) power tool.
Work area safety1.
Keep work area clean and well lit.a. Cluttered or dark areas invite accidents.
Do not operate power tools inb. explosive atmospheres, such as in
the presence of ammable liquids,
gases or dust. Power tools create
sparks which may ignite the dust or
fumes.
Keep children and bystandersc. away while operating a power tool.
Distractions can cause you to lose
control.
Electrical safety2.
Power tool plugs must match thea. outlet. Never modify the plug in
any way. Do not use any adapter
plugs with grounded power tools.
Unmodied plugs and matching outlets
will reduce risk of electric shock.
Avoid body contact with groundedb. surfaces such as pipes, radiators,

Page 3For technical questions, please call 1-800-444-3353.SKU 90287
ranges and refrigerators. There is an
increased risk of electric shock if your
body is grounded.
Do not expose power tools to rainc. or wet conditions. Water entering
a power tool will increase the risk of
electric shock.
Do not abuse the cord. Never used. the cord for carrying, pulling or
unplugging the power tool. Keep
cord away from heat, oil, sharp
edges or moving parts. Damaged
or entangled cords increase the risk of
electric shock.
When operating a power toole. outdoors, use an extension cord
suitable for outdoor use. Use of a
cord suitable for outdoor use reduces
the risk of electric shock.
If operating a power tool in a dampf. location is unavoidable, use a
Ground Fault Circuit Interrupter
(GFCI) protected supply. Use of a
GFCI reduces the risk of electric shock.
Personal safety3.
Stay alert, watch what you area. doing and use common sense when
operating a power tool. Do not use
a power tool while you are tired or
under the inuence of drugs, alcohol
or medication. A moment of inattention
while operating power tools may result
in serious personal injury.
Use personal protective equipment.b. Always wear eye protection. Safety
equipment such as dust mask, non-
skid safety shoes, hard hat, or hearing
protection used for appropriate
conditions will reduce personal injuries.
Prevent unintentional starting.c. Ensure the switch is in the off-
position before connecting to power
source and/or battery pack, picking
up or carrying the tool. Carrying
power tools with your nger on the
switch or energizing power tools that
have the switch on invites accidents.
Remove any adjusting key or wrenchd. before turning the power tool on.
A wrench or a key left attached to a
rotating part of the power tool may result
in personal injury.
Do not overreach. Keep propere. footing and balance at all times. This
enables better control of the power tool
in unexpected situations.
Dress properly. Do not wear loosef. clothing or jewelry. Keep your hair,
clothing and gloves away from
moving parts. Loose clothes, jewelry
or long hair can be caught in moving
parts.
Only use safety equipment that hasg. been approved by an appropriate
standards agency. Unapproved
safety equipment may not provide
adequate protection. Eye protection
must be ANSI-approved and breathing
protection must be NIOSH-approved for
the specic hazards in the work area.
Power tool use and care4.
Do not force the power tool. Usea. the correct power tool for your
application. The correct power tool will
do the job better and safer at the rate
for which it was designed.
Do not use the power tool if theb. switch does not turn it on and off.
Any power tool that cannot be controlled
with the switch is dangerous and must
be repaired.
Disconnect the plug from the powerc. source and/or the battery pack from
the power tool before making any
adjustments, changing accessories,
or storing power tools. Such

Page 4 For technical questions, please call 1-800-444-3353. SKU 90287
preventive safety measures reduce
the risk of starting the power tool
accidentally.
Store idle power tools out of thed. reach of children and do not allow
persons unfamiliar with the power
tool or these instructions to operate
the power tool. Power tools are
dangerous in the hands of untrained
users.
Maintain power tools. Check fore. misalignment or binding of moving
parts, breakage of parts and any
other condition that may affect the
power tool’s operation. If damaged,
have the power tool repaired before
use. Many accidents are caused by
poorly maintained power tools.
Use the power tool, accessoriesf. and tool bits etc. in accordance
with these instructions, taking into
account the working conditions and
the work to be performed. Use of
the power tool for operations different
from those intended could result in a
hazardous situation.
Service5.
Have your power tool serviced by aa.
qualied repair person using only
identical replacement parts. This will
ensure that the safety of the power tool
is maintained.
Sharpener Safety Warnings
Be careful of bits when sharpening. Bits1. will become hot. Handle with care; allow
tips to cool before storing.
Sharpening head may become hot2. while using. This is a normal result of
operation.
Maintain labels and nameplates on3. the tool. These carry important safety
information. If unreadable or missing,
contact Harbor Freight Tools for a
replacement.
Avoid unintentional starting. Prepare to4. begin work before turning on the tool.
Do not leave the tool unattended when5. it is plugged into an electrical outlet.
Turn off the tool, and unplug it from its
electrical outlet before leaving.
This product is not a toy. Keep it out of6. reach of children.
People with pacemakers should7. consult their physician(s) before use.

to heart pacemaker could cause
pacemaker interference or pacemaker
failure.
WARNING: Handling the cord on this8. product will expose you to lead, a
chemical known to the State of California
to cause cancer, and birth defects or
other reproductive harm. Wash hands
after handling. (California Health &
Safety Code § 25249.5, et seq.)
The warnings, precautions, and9. instructions discussed in this instruction
manual cannot cover all possible
conditions and situations that may occur.
It must be understood by the operator
that common sense and caution are
factors which cannot be built into this
product, but must be supplied by the
operator.
SAVE THESE
INSTRUCTIONS.

Page 5For technical questions, please call 1-800-444-3353.SKU 90287
GROUNDING
TO PREVENT
ELECTRIC SHOCK
AND DEATH FROM INCORRECT
GROUNDING WIRE
CONNECTION:
Check with a qualied 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 t
the outlet, have a proper outlet
installed by a qualied
electrician.
Double Insulated Tools: Tools with
Two Prong Plugs
Outlets for 2-Prong Plug
Tools marked “Double Insulated” do1. not require grounding. They have a
special double insulation system which

complies with the applicable standards
of Underwriters Laboratories, Inc., the
Canadian Standard Association, and the
National Electrical Code. (See Outlets
for 2-Prong Plug.)
Double insulated tools may be used in2. either of the 120 volt outlets shown in the

2-Prong Plug.)
Extension Cords
Grounded1. tools require a three wire
extension cord. Double Insulated
tools can use either a two or three wire
extension cord.
As the distance from the supply outlet2. 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 Table A.)
The smaller the gauge number of the3. 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 Table A.)
When using more than one extension4. cord to make up the total length, make
sure each cord contains at least the
minimum wire size required. (See Table
A.)
If you are using one extension cord for5. more than one tool, add the nameplate
amperes and use the sum to determine
the required minimum cord size. (See
Table A.)
If you are using an extension cord6. outdoors, make sure it is marked with the

is acceptable for outdoor use.
Make sure the extension cord is properly7. wired and in good electrical condition.
Always replace a damaged extension

electrician before using it.

Page 6 For technical questions, please call 1-800-444-3353. SKU 90287
Protect the extension cords from sharp8. objects, excessive heat, and damp or
wet areas.
RECOMMENDED MINIMUM WIRE
GAUGE FOR EXTENSION CORDS*
(120/240 VOLT)
NAMEPLATE
AMPERES
(at full load)
EXTENSION CORD
LENGTH
25’ 50’ 75’
100’ 150’
0 – 2.0 18 18 18 18 16
2.1 – 3.4 18 18 18 16 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 - - -
TABLE A * Based on limiting the line
voltage drop to ve volts at
150% of the rated amperes.
Symbology
Double Insulated
Canadian Standards Association
Underwriters Laboratories, Inc.
V~ Volts Alternating Current
AAmperes
n0xxxx/min. No Load Revolutions per Minute
(RPM)
SPECIFICATIONS
Required Power 120 V~, 60 Hz, 70 W
Speed 1,600 RPM
Capacity 9/64” to 25/64” (3.6 – 10 mm)
UNPACKING
When unpacking, check to make the unit
is intact and in working order. If any parts are
missing or broken, please call Harbor Freight
Tools at the number on the cover of this
manual.

Page 7For technical questions, please call 1-800-444-3353.SKU 90287
OPERATION
Properly Sharpened Bits
Figure 1 — Parts of the Bit
Center Point Cutting Edge
Trailing Edge
Your bit is properly sharpened when it
has the following characteristics.
A sharp point in the center of the bit.1.
Two sharp and equal cutting edges.2.
Two trailing edges that are slightly lower3. than the cutting edges.
Sharpening Procedure
1. and plug in.
Select a clean bit to be sharpened and2. match its size with one of the holes in the
head.
Figure 2 — Putting Bits into Sharpener
Twist until
locked in
place
3. Put the bit into the appropriate hole and
twist until it locks into place. See Figure
2.
Figure 3 — Tilt the Bit
Tilt out
slightly
4. Lean the bit towards the number on the
outside of the hole. See Figure 3.
Turn the unit on while exerting a slight5. downward pressure onto the bit.
Turn unit off after about 5-10 seconds.6.
Examine bit according to the7. “Sharpening Troubleshooting” section,
below.

Page 8 For technical questions, please call 1-800-444-3353. SKU 90287
Sharpening Troubleshooting:8.
If the tip of the bit is turning blue, it isa. overheating. Reduce the amount of
pressure and sharpening time. Cool bit
in water between sharpening.
If one edge is longer than the other,b. and the point is not centered, sharpen
the shorter side for a little less time. To
prevent this from happening, sharpen
both sides the same amount of time,
using the same amount of pressure.
If you are sharpening a broken (ratherc. than a dull bit) and the time required to


grinder.
CAUTION9. : Do not touch the end of the
bit after it is sharpened. The bit will
become hot!
Repeat the above steps to the other side10. of the bit. Sharpen both sides the same
amount of time, using the same amount
of pressure.
Repeat the above steps as necessary to11. sharpen bit.
Adjusting the Grinding Wheel
1. right to raise the wheel. This will give you
an aggressive cutting action. This is also
useful when you are working with short
bits.
2. the left. This is desirable when you wish

longer and require more repetitions.

Page 9For technical questions, please call 1-800-444-3353.SKU 90287
MAINTENANCE
Changing the Wheel
Change the GRINDING WHEEL (6) if1. grooves or ridges mar the evenness of
the grinding surface.
Figure 4 — Removing the Screws
Adjusting Knob (1)
Screw
(3)
Screw
(3)
2. Remove the two SCREWS (3). See
Figure 4.
Remove the Index Head Assembly (1, 2,3. & 7).
Remove the Wheel Assembly. Make sure4. the SPRING (10) stays in place. Refer
to the Parts Diagram if necessary.
Unscrew the ADJUSTMENT CYLINDER5. (4) from the WHEEL BASE (7) by turning
clockwise.
Pry out the WASHER (5).6.
Pop out the WHEEL BASE (7).7.
Press new WHEEL (6) onto WHEEL8. BASE (7), replace WASHER (5), and
screw CYLINDER (4) back in.
Replace Wheel Assembly onto unit.9.

ADJUSTMENT CYLINDER (4) match the

Replace the DRILL10. INDEX and
SCREWS (3).
Cleaning
Keep the surface of your unit free of grit,1. dirt, and grease. Use soapy water or
non-toxic solvents. Do not use petroleum
based solvents.
Keep the air vents free of foreign matter2. at all times.
Operation Troubleshooting
If the motor turns on, but the wheel does1. not spin, make sure the ADJUSTMENT


as described in “Maintenance, Changing
the Wheel”.
It the motor does not turn on, it needs2.

technician.

Page 10 For technical questions, please call 1-800-444-3353. SKU 90287
PARTS LIST
Part Description Qty
1 Adjusting Knob 1
2 Drill Index 1
3 Round Screw 2
4 Spindle 1
5 Washer 1
6 Grinding Wheel 1
7 Wheel Base 1
8 Spring 1
9 Transmission Shaft 1
10 Dust Cover 1
11 Bearing 1
12 Drill Index Holder 1
13 Motor Housing, Upper 1
14 Motor 1
15 Voltage Regulator 1
16 Switch 1
17 Motor Housing, Lower 1
18 Cord 1
19 Round Screw 2
20 Cord Clamp 1
21 Screw 3
22 Bolt 1
23 Screw 2
24 Washer 2
25 Spindle Adaptor 1
REV 09j

Page 11For technical questions, please call 1-800-444-3353.SKU 90287
ASSEMBLY DIAGRAM
1
2
3
4
5
6
7
8
10
11
12
9
22
23
24
25
13
21
14
15
16
17
18
19
20
3
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Page 12 For technical questions, please call 1-800-444-3353. SKU 90287
LIMITED 90 DAY WARRANTY
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality
and durability standards, and warrants to the original purchaser that this product is free from
defects in materials and workmanship for the period of 90 days from the date of purchase. This
warranty does not apply to damage due directly or indirectly, to misuse, abuse, negligence or
accidents, repairs or alterations outside our facilities, criminal activity, improper installation,
normal wear and tear, or to lack of maintenance. We shall in no event be liable for death,
injuries to persons or property, or for incidental, contingent, special or consequential damages
arising from the use of our product. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation of exclusion may not apply to
you.

To take advantage of this warranty, the product or part must be returned to us with
transportation charges prepaid. Proof of purchase date and an explanation of the complaint

replace the product at our election or we may elect to refund the purchase price if we cannot
readily and quickly provide you with a replacement. We will return repaired products at our
expense, but if we determine there is no defect, or that the defect resulted from causes not
within the scope of our warranty, then you must bear the cost of returning the product.

vary from state to state.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • [phone]
REV 09j