MasterCraft 055-3500-2 User manual

model no. 055-3500-2
BENCH GRINDER
WITH FLEXIBLE WORK LIGHT
IINSTRUCTION
MANUAL
IMPORTANT:
For your own safety, read and follow all of the Safety Guidelines
and Operating Instructions before operating this bench grinder.

TABLE OF CONTENTS
3
model no. 055-3500-2 | contact us 1-800-689-9928
Specifications
Safety guidelines
Package contents
Assembly preparation
Assembly instructions
Key parts diagram
Operating instructions
Maintenance
Exploded view
Parts list
Troubleshooting
Warranty
4
5
6
7
9
10
11
12
14
15
16
18
TABLE OF CONTENTS

WARNING!
DANGER!
Read, understand and observe all instructions in this manual before using or operating the tool for which
it is written and supplied. Ensure that anyone who is to use the tool has read and understood the instructions
provided.
Failure to observe any of the following instructions could result in severe personal injury to tool user and
bystanders or cause damage to tool and property!
• Always wear safety glasses complying with OSHA/ANSI requirements Z87.1.
• Wear a mask or respirator when dust is generated.
• Keep bystanders out of the work area while operating the tool.
• WARNING! Always ensure that the work area is clear of any flammable materials, liquids or gasses,
because the use of this tool may create sparks.
• Wheel guards and eye shields must be properly adjusted and tightened.
• During each start-up, stand to one side of the grinder and switch it on. Let the grinder operate at
full speed for approximately one minute so that any undetected flaws or cracks will become
apparent.
• Use only 40 W (max.) bulbs on the work light.
• Use only 8” wheels suitable for 3450 RPM or over.
• Keep guards in place and working properly.
• Keep hands clear of grinding wheels.
• Always make sure wheels are properly mounted.
• Secure the tool when working to prevent unexpected movement.
• Never reach behind or beneath the grinding wheels.
• Unplug from power supply before adjusting or servicing. The grinding wheels continue to rotate
after the tool is switched off. Always allow wheels to stop before adjusting or servicing.
• To avoid electric shock, DO NOT use in damp conditions or expose to rain.
• When fitting a new grinding wheel, always check that the stated maximum RPM meets or
exceeds that stated on the grinder. Also check the new wheel for damage, such as flaws or
cracks. If the wheel appears satisfactory, fit it to the grinder.
• When a new grinding wheel has been fitted, stand to one side of the grinder and switch it on.
Let the grinder operate at full speed for approximately one minute so that any undetected flaws
or cracks will become apparent.
• Use only accessories that are recommended by the manufacturer for your model.
• DO NOT attempt to cut anything with the grinding wheel.
• Grounded tools must be plugged into an outlet that has been properly installed and grounded
in accordance with all local codes and ordinances. Never remove the grounding prong from
the plug or modify it in any way. Do not use adaptor plugs. If in doubt as to whether the outlet is
properly grounded, consult a qualified electrician.
• Do not use the tool when tired or under the influence of drugs, alcohol or medication.
• Do not wear gloves, neckties, jewellery or loose clothing when using tool. Keep hair tied back.
• Ensure the power switch is off prior to plugging in the tool.
• WARNING! Replace cracked grinding wheels immediately.
• Do not overtighten spindle nuts.
• Spacing between tool rests and wheels should be set to 1/8” or less; hold workpiece firmly
against tool rest.
• Service on these tools should only be performed by an authorized, qualified technician.
• Failure to comply with these warnings may result in serious personal injury
• There is a risk of injury due to accidental starting; do not use this tool in an area where children
may be present.
!
SPECIFICATIONS
5
model no. 055-3500-2 | contact us 1-800-689-9928
Model： 055-3500-2
Motor： 120 V AC, 60 Hz, 4.8A, 3/4 HP
Wheel Size： 8 x 1" (20.3 x 2.5 cm) with 5/8" (1.6 cm) arbour
Speed： 3450 RPM (no-load)
Wheels: 36- and 60-grit
Weight: 29 lb 2 oz (13.2 kg)
4
SPECIFICATIONS
SAFETY GUIDELINES

Left work rest
Right work rest
Plain eye shield assembly
Magnify eye shield
Left eye shield support
Right eye shield support
Bracket
Flat washer D6
Hex bolt M6X14
Spark deflector
Star-head screw+flat washer M5X10
Flat washer D8
Hex bolt M8X8
1
1
1
1
1
1
2
2
2
2
2
4
4
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6
PACKAGE CONTENTS
Description Qty
7
PACKAGE CONTENTS
• Always wear eye protection that complies with a recognized standard (CSA or ANSI;
for example: ANSI Z87.1)
• Wear a mask or respirator when dust is generated.
• Keep bystanders out of the work area while operating the tool.
• WARNING! Always ensure that the work area is clear of any flammable materials, liquids or gases,
because the use of this tool may create sparks.
• Do not wear loose clothing or jewellery. Keep hair tied back.
• WARNING! Replace cracked grinding wheels immediately.
• Do not overtighten spindle nuts.
• Adjust tool rests whenever necessary to maintain a distance of 1/8” (3.2 mm) from the grinding
wheel.
• NEVER grind on the side of the wheel. Grind on the face of the wheel only.
• NEVER apply pressure to the workpiece when the grinding wheel is cold. Allow the wheel to warm
up by applying the workpiece gradually.
• NEVER use the grinder without the wheel guards. Keep thumbs and fingers away from the wheel.
In the event of a malfunction or short circuit, grounding provides the path of least resistance for
electrical current, and reduces the risk of electric shock for the operator. This tool is equipped with
an electric cord that has 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 will not fit the outlet, have the proper outlet installed
by an electrician.
IMPROPER CONNECTION of the equipment grounding conductor can result in increased risk of electric
shock. The conductor with the green insulation (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 you do not completely understand the
grounding instructions, or if you are not sure if the tool is properly grounded.
This tool is intended for use on a circuit that has
align outlet that looks like the one illustrated. The
original tool has a grounding plug that looks like
the plug illustrated.
Before You Start Safety
Before You Start – Electrical
ASSEMBLY PREPARATION
3-Pronged Plug
Properly Grounded
3-Hole Receptacle
Grounding Prong

Before attempting to use this grinder, it must be properly mounted to a workbench or grinding stand.
Fit the eye shield to the mount rod. Mount
the left and right shield rods to the inside
of the wheel guards using hex bolts.
Using two long bolts, washers, lock-washers and
nuts, as shown (not supplied), secure the grinder
to the workbench.
NOTE:
CAUTION!
The eye shield should move freely when being adjusted, but stay in place when the screw is tightened.
Bench grinders vibrate. Grinder movement during high-speed rotation may cause injury or damage to the
workpiece or operator. Mount the grinder securely to a sturdy workbench or grinding stand.
!
model no. 055-3500-2 | contact us 1-800-689-9928
Total Length of Cord in Feet (meters)Ampere Rating
1
2
8
Workbench
Flat washer
Hex nut
Bolt
Flat
washer
Attach the left eye shield mounting rod to the bench
grinder using the bracket, flat washer and bolt supplied.
3
USE ONLY THREE-WIRED EXTENSION CORDS that have 3-pronged plugs and 3-holed outlets that
accept the tool’s plug. Repair or replace damaged or worn cords immediately.
Be sure your extension cord is properly wired and in good condition. Do not use damaged extension
cords. Always replace a damaged extension cord.
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 table below shows the correct size to use according to the cord length and the amperage draw
of the tool (specified on the nameplate). When in doubt, use the next heavier gauge. The smaller the
gauge number, the heavier the cord. (AWG = American Wire Gauge).
Use a separate electrical circuit for your tools. This circuit should not be less than a #12 gauge wire,
and should be protected with a 15 A time-lag fuse. Before connecting the motor to the power line,
ensure the switch is in the OFF position and the electric current is rated the same as the current
stamped on the motor’s nameplate. Running at a lower voltage will damage the motor and is not
covered by warranty.
Minimum Gauge for Extension Cords (AWG)
(when using 120 volts only)
Use of Extension Cords
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ASSEMBLY PREPARATION
ASSEMBLY INSTRUCTIONS
More Than Not More Than 25’(7.6m) 50’(15m) 100’(3 0.4m) 150’(4 5.7m)
0 6 18 16 16 14
6 10 18 16 14 12
10 12 16 16 14 12
12 16 14 12 Not Recommended

10 11
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No. Qty.Description
1 Lamp on/off switch
Lamp
Spark deflector
Plain eye shield
Grinding wheel 36#
Left work rest
2
3
4
5
6
No. Qty.Description
7 Switch
Magnify eye shield
Grinding wheel 60#
Right work rest
Base
8
9
10
11
1
1
2
1
1
1
1
1
1
1
Water tray
12 1
1
1
8
11 12
9
10
2
3
4
5
6
7
Start-up
Shut-down
This Mastercraft Bench Grinder is ideal for use in sharpening chisels, axes and other woodcutting
tools. It is also useful for repairing tips on screwdrivers and drill bits or for removing excess metal burrs
from pieces of cut metal.
With the proper accessories, this tool can be used for cleaning metal surfaces using a wire brush or
for buffing and polishing using a cloth wheel.
The rocker I/O power switch is located on the front of the grinder.
TM
Press the side marked “I”to turn the grinder on.
Press the side marked “O”to turn the grinder off.
KEY PARTS DIAGRAM
OPERATING INSTRUCTIONS

• Always keep the workpiece moving across the face of the grinding wheel. Grinding continuously on
the same spot on the wheel will cause grooves to be worn into the wheel. The wheel may crack or
become damaged more easily, and grinding of other objects will be difficult.
• If the workpiece becomes hot, dip it into water or oil to cool it.
• Always grind on the face of the wheel (around the diameter), NEVER on the sides. Side pressure on
grinding wheels can cause cracking and damage.
• If the face of the grinding wheel is worn unevenly, becomes grooved, or is no longer smooth and flat,
the wheel should be reshaped with a dressing tool (not supplied).
• If the diameter of the grinding wheel is no longer round, the wheel should be reshaped with a dressing
tool or replaced.
• If the surface of the wheel becomes loaded and dull with workpiece material, the wheel should be
cleaned with a dressing tool.
• After reshaping, always readjust the tool rests and spark arrestors.
model no. 055-3500-2 | contact us 1-800-689-9928
WARNING!
IMPORTANT!
CAUTION!
Turn the power off and remove the plug from the outlet before changing the grinding wheels. When
turning the grinder on with a newly installed wheel, DO NOT STAND IN FRONT OF THE GRINDER. Stand
to the side and allow the grinder to run for at least one minute before proceeding to use it.
Do not overtighten the spindle hex nut, because this may cause the wheel to crack.
DO NOT INSTALL OR USE A DAMAGED GRINDING WHEEL. The force of rotation may cause a damaged
wheel to fly apart, and could injure operators or bystanders.
!
1. Use a screwdriver to loosen the wheel cover screws and push counter-clockwise to remove the
wheel cover.
2. Fit an appropriately sized wrench on the spindle hex nut.
3. Loosen the wheel nut in a clockwise direction for the left side and a counter-clockwise direction
for the right side.
4. Remove the outer flange and grinding wheel. To remove the hex nut, turn the wrench and nut until
the wrench is resting on the workbench behind the tool.
5. Inspect the new wheel carefully to ensure there are no cracks, chips or other damage.
6. Wipe the flange surfaces clean, and install the new wheel, flange and the spindle hex nut.
7. To install a new grinding wheel, reverse the above procedure.
8. Be sure the grinding wheel and outer flange are properly seated on the spindle shaft.
9. Replace the wheel cover and reposition the tool rest.
To change the wheel to a wire wheel, first assemble the spacer, then follow the steps above to change
the wheel.
Check power cord
Check wheels for cracks
Check moving parts for alignment and binding issues
Dress grinding wheels
Replace grinding wheels
Clean and vacuum dust
Replace work-light bulb
Before each use
Before each use
Before each use
As needed
As needed
As needed
As needed
Maintenance Required Frequency
Installing or Changing the Wheel
Installing or Changing the Wire Wheel
Installing or Changing the Wheel
Work-light Bulb Replacement
When grinding, metal objects become heated quickly. It is important to keep moving the object back
and forth across the face of the grinding wheel and to cool the object frequently using the coolant tray.
When the light bulb is worn out and will no longer work, purchase a replacement bulb. To replace,
gently push the light bulb into the socket and turn clockwise. Uses Max 40 W anti-vibration light bulb.
Note:
12 13
MAINTENANCE MAINTENANCE

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51
32
31
4
4
6
30
15
50
34
35
41 42 38 43 44 45 46 46 48 49
403938
35
34
33
37
36
52
47
14
29
28
11
12
13
27
8
26
17
23
25
24
21 19
18
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12
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10
8
7
6
9
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3
2
1
20
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EXPLODED VIEW
15
PARTS LIST
No. Qty.Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Star-head screw M5X48
Left wheel guard cover
Hex nut, I type M16 left
Wheel flange
Grinding wheel 36#
Star-head screw+spring washer M5X10
Left wheel guard plate
Hex flange nut M5
Plain eye shield assy.
Left eye shield support
Bracket
Flat washer D6
Hex bolt M6X14
Spark deflector
Star-head screw+flat washer M5X10
Star-head screw+flat washer M5X155
End cap
Strain relief 6P4
Wave spring retainer D40
Cord & plug
Lamp assy
Flat washer D12
Bearing
Stator
Rotor
Hex flange nut M5
No. Qty.Description
3
1
1
4
1
6
1
6
1
1
2
2
2
2
2
4
2
1
2
1
1
1
2
1
1
4
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
Right wheel guard plate
Right eye shield support
Magnify eye shield assy.
Grinding wheel 60#
Hex nut, I type M16
Right wheel guard cover
Left work rest
Flat washer D8
Hex bolt M8X8
Hex bolt M8X20
Capacitor
Star-head screw+flat washer+
spring washer M4X8
Rubber washer
Star-head screw+ big flat washer M5X1 6
Cord bushing
Toothed lock washer D4
Base
Switch plate
Switch
Star-head screw M4X8
Coolant tray clip
Coolant tray
Base cover
Right work rest
Star-head screw M5X51
Spring washer D8
1
1
1
1
1
1
1
4
4
2
1
3
4
4
1
2
1
1
1
4
1
1
1
1
3
2

model no. 055-3500-2 | contact us 1-800-689-9928
Service on these tools should only be performed by an authorized, qualified
technician.
Motor will not start.
Motor will not
start-fuses or circuit
breakers tripping or
blowing.
Motor overheats.
Motor stalls
(resulting in blown
fuses or tripped
circuit).
Machine slows when
operating.
Wavy condition on
surface of workpiece.
16 17
TROUBLESHOOTING TROUBLESHOOTING
SYMPTOM PROBABLE CAUSE
PROBABLE CAUSE
CORRECTIVE ACTION
1. Low voltage.
2. Open circuit in motor or loose
connections.
3. Blown fuse or breaker.
1. Check power source for proper voltage.
2. Inspect all lead connections on motor for
loose or open connections.
(Send for servicing)
3. Change fuse or reset breaker.
(send for servicing)
1. Short circuit in line, cord or
plug.
2. Short circuit in motor or loose
connections.
3. Incorrect fuses or circuit
breakers in power line.
1. Motor overloaded.
2. Extension cord too long and of
insufficient gauge (weight).
1. Short circuit in motor or loose
connections.
2. Low voltage.
3. Incorrect fuses or circuit
breakers in power line.
4. Motor overload.
1. Feed rate too great.
1. Machine vibrating.
2. Workpiece not being held
firmly.
3. Wheel face uneven.
4. Wheel is too hard.
1. Inspect cord or plug for damaged
insulation and shorted wires.
2. Inspect all connections on motor for loose
or shorted terminals and/or worn insulation.
3. Install correct fuses or circuit breakers or
switch tool to an appropriately sized circuit.
1. Reduce load on motor.
2. Utilize an extension cord of appropriate
gauge and length or plug tool directly into
outlet.
1. Inspect connections on motor for loose or
shorted terminals or worn insulation.
(Send for servicing)
2. Correct low voltage conditions (for example:
improper extension cord length and/or
gauge).
3. Install correct fuses or circuit breakers or
plug tool into an appropriate circuit, matched
to an appropriate fuse or breaker.
4. Reduce the load on the motor.
1. Reduce the rate at which the workpiece is
fed into the working area of the tool
(grinding wheel).
1. Ensure machine is securely mounted on a
solid surface.
2. Use a holding device to firmly retain the
workpiece.
3. Dress the grinding wheel.
4. Use softer wheel, or reduce the feed rate.
Lines on surface of
workpiece.
Burning spots or
cracks in the
workpiece.
Wheel dulls quickly,
grit falls off.
Wheel clogs and
workpiece shows
burn marks.
SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
1. Impurity on surface of wheel.
2. Workpiece not being held
tightly.
1. Improper type of grinding
wheel.
2. Improper feed rate.
3. Coolant required.
1. Feed rate is too aggressive.
2. Wheel is soft.
3. Wheel diameter too small.
4. Bad wheel dressing.
5. Defective wheel bonding.
1. Wheel is too hard.
2. Feed rate is too slow.
3. Bad wheel dressing.
4. Coolant required.
1. Dress the grinding wheel.
2. Use a holding device to more firmly retain
the workpiece.
1. Try wheels with softer bond or coarser grit.
2. Slow down the rate at which the workpiece
is fed into the wheel.
3. Introduce coolant.
1. Decrease feed rate of workpiece into
grinding wheel.
2. Select a grinding wheel with a harder bond
of material.
3. Replace wheel.
4. Dress the wheel.
5. DO NOT USE – return wheel to point of
purchase.
1. Select a grinding wheel with a softer bond
of material.
2. Increase the feed rate of the workpiece into
the grinding wheel.
3. Dress the wheel.
4. Introduce coolant.

3-Year Limited Warranty
This Mastercraft product is guaranteed for a period of 3 years from the date of original retail purchase
against defects in workmanship and materials, except for the following component:
Component A: Accessories, which are guaranteed for a period of 1-year from the date of original retail
purchase against defects in workmanship and materials.
Subject to the conditions and limitations described below, this product, if returned to us with proof of
purchase within the stated warranty period and if covered under this warranty, will be repaired or
replaced (with the same model, or one of equal value or specification), at our option. We will bear the
cost of any repair or replacement and any costs of labour relating thereto.
These warranties are subject to the following conditions and limitations:
a) a bill of sale verifying the purchase and purchase date must be provided;
b) this warranty will not apply to any product or part thereof which is worn or broken or which has
become inoperative due to abuse, misuse, accidental damage, neglect or lack of proper
installation, operation or maintenance (as outlined in the applicable owner’s manual or operating
instructions) or which is being used for industrial, professional, commercial or rental purposes;
c) this warranty will not apply to normal wear and tear or to expendable parts or accessories that
may be supplied with the product that are expected to become inoperative or unusable after a
seasonable period of use;
d) this warranty will not apply to routine maintenance and consumable items such as, but not limited
to, fuel, lubricants, vacuum bags, blades, belts, sandpaper, bits, fluids, tune-ups or adjustments;
e) this warranty will not apply where damage is caused by repairs made or attempted by others
(i.e. persons not authorized by the manufacturer);
f) this warranty will not apply to any product that was sold to the original purchaser as a
reconditioned or refurbished product (unless otherwise specified in writing);
g) this warranty will not apply to any product or part thereof if any part from another manufacturer is
installed therein or any repairs or alterations have been made or attempted by unauthorized persons;
h) this warranty will not apply to normal deterioration of the exterior finish, such as, but not limited
to, scratches, dents, paint chips, or to any corrosion or discolouring by heat, abrasive and
chemical cleaners;
i) this warranty will not apply to component parts sold by and identified as the product of another
company, which shall be covered under the product manufacturer’s warranty, if any.
Additional Limitations
This warranty applies only to the original purchaser and may not be transferred. Neither the retailer nor
the manufacturer shall be liable for any other expense, loss or damage, including, without limitation,
any indirect, incidental, consequential or exemplary damages arising in connection with the sale, use
or inability to use this product.
Notice to Consumer
This warranty gives you specific legal rights, and you may have other rights, which may vary from
province to province. The provisions contained in this warranty are not intended to limit, modify, take
away from, disclaim or exclude any statutory warranties set forth in any applicable provincial or
federal legislation.
model no. 055-3500-2 | contact us 1-800-689-9928
WARRANTY
18