PROPOINT 8712135 User manual

V1.0 8712135
Please read and understand all instructions before use. Retain this
manual for future reference.
USER MANUAL
8 in. BENCH GRINDER WITH PCB
LCD READOUT

8712135 8 in. BENCH GRINDER WITH PCB LCD READOUT V1.0
2 For technical questions call 1-800-665-8685
SPECIFICATIONS
Horsepower 1-1/2 HP
Grinding Wheel Dimensions 8 in. Diameter by 1 in. Thick
Arbor Size 5/8 in.
Grit
36 and 60
No Load Speed 1,800 to 3,450 RPM
Rating (Voltage, Current, Frequency) 120V, 12A, 60Hz
INTRODUCTION
The 8 in. Bench Grinder with PCB LCD readout is used for hand
held grinding, sharpening and cleaning. It has a 1-1/2 HP
induction motor for quiet, smooth performance. The tool rests
are adjustable as are the safety eye shields. The heavy duty
cast iron base is predrilled to bolt the grinder to a workbench.
SAFETY
WARNING! Read and understand all instructions before using
this tool. The operator must follow basic precautions to reduce
the risk of personal injury and/or damage to the equipment.
Keep this manual for safety warnings, precautions, operating or
inspection and maintenance instructions.
HAZARD DEFINITIONS
Please familiarize yourself with the hazard notices found in this
manual. A notice is an alert that there is a possibility of property
damage, injury or death if certain instructions are not followed.
8 in. BENCH GRINDER WITH PCB
LCD READOUT

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DANGER! This notice indicates an immediate and specific
hazard that will result in severe personal injury or death if the
proper precautions are not taken.
WARNING! This notice indicates a specific hazard or unsafe
practice that could result in severe personal injury or death if
the proper precautions are not taken.
CAUTION! This notice indicates a potentially hazardous
situation that may result in minor or moderate injury if proper
practices are not taken.
NOTICE! This notice indicates that a specific hazard or unsafe
practice will result in equipment or property damage, but not
personal injury.
WORK AREA
1. Operate in a safe work environment. Keep your work area
clean, well-lit and free of distractions. Place lights so you
are not working in a shadow.
2. Keep anyone not wearing the appropriate safety
equipment away from the work area.
3. Store tools properly in a safe and dry location. Keep tools
out of the reach of children.
4. Do not install or use in the presence of flammable gases,
dust or liquids.
PERSONAL SAFETY
WARNING! Wear personal protective equipment approved by
the Canadian Standards Association (CSA) or American
National Standards Institute (ANSI).
PERSONAL PROTECTIVE EQUIPMENT
1. Always wear impact safety goggles that provide front and
side protection for the eyes. Eye protection equipment
should comply with CSA Z94.3-07 or ANSI Z87.1 standards
based on the type of work performed.

8712135 8 in. BENCH GRINDER WITH PCB LCD READOUT V1.0
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2. Wear the appropriate type of full-face shield in addition to
safety googles, as the work can create chips, abrasive or
particulate matter.
3. Wear gloves that provide protection based on the work
materials or to reduce the effects of tool vibration.
3.1 Do not wear gloves when operating a tool that can
snag the material and pull the hand into the tool.
4. Wear protective clothing designed for the work
environment and tool.
5. Non-skid footwear is recommended to maintain footing
and balance in the work environment.
6. Wear steel toe footwear or steel toe caps to prevent a foot
injury from falling objects.
PERSONAL PRECAUTIONS
Control the tool, personal movement and the work
environment to avoid personal injury or damage to the tool.
1. Do not operate any tool when tired or under the influence
of drugs, alcohol or medications.
2. Avoid wearing clothes or jewelry that can become
entangled with the moving parts of a tool. Keep long hair
covered or bound.
3. Do not overreach when operating the tool. Proper footing
and balance enables better control in unexpected situations.
SPECIFIC SAFETY PRECAUTIONS
WARNING! DO NOT let comfort or familiarity with product
(gained from repeated use) replace strict adherence to the
tool safety rules. If you use this tool unsafely or incorrectly,
you can suffer serious personal injury.
1. Use the correct tool for the job. This tool was designed for
a specific function. Do not modify or alter this tool or use it
for an unintended purpose.

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2. Keep hands and fingers away from the grinding area. Any
part of body coming in contact with moving parts could
cause injury.
3. Never use a tool with a cracked or worn grinding wheel.
Change the grinding wheel before using. Use only flanges
supplied with the grinder.
4. Before using the tool on a workpiece, test the tool by running
it at the highest no-load speed for at least 60 seconds in a
safe position. Stop immediately if there is any abnormal
vibration or wobbling that could indicate poor installation of
the grinding wheel. Check the tool to determine the cause.
5. Do not start the tool when the grinding wheel is touching
the workpiece.
6. Never force the tool. Excessive pressure could break the tool,
resulting in damage to your workpiece or serious personal
injury. If your tool runs smoothly under no load, but does
not run smoothly under load, then excessive pressure is
being used.
7. Do not allow the tool’s motor to overload and/or overheat
by taking work breaks.
8. This tool will not stop moving immediately. Do not leave
the tool unattended until it has come to a complete stop.
9. Never touch the grinding wheel or workpiece during or
immediately after use. The grinding wheel or workpiece will
be too hot to be touched by bare hands.
10. Clean dust and debris from beneath the grinding
wheels frequently.
11. Do not stand directly in front of the machine when turning it
ON. Always stand off to the side of the machine and do not
allow any part of your body to be in line with the wheel’s path.
12. Do not grind magnesium or aluminum, as a fire may result.

8712135 8 in. BENCH GRINDER WITH PCB LCD READOUT V1.0
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13. Make sure the bench grinder is on a firm, level surface and
properly secured to avoid injury from unexpected movement.
Firmly clamp or bolt the bench grinder to a support surface
to prevent slipping or sliding during the operation.
14. Do not use a grinding wheel that vibrates when used. If
dressing the wheel does not solve the vibration, replace it.
Also inspect the machine for other causes of vibration such
as worn bearings or a bent shaft. Repair or replace broken
components immediately before reusing the machine.
GRINDING TOOL PRECAUTIONS
1. Only use a grinding wheel of the recommended size
(see Specifications)
1.1 Only use a grinding wheel with the correct arbor size
and shape that matches the grinder’s spindle.
2. Ensure the grinding wheel has a clean edge. Check the
grinding wheel for wear or chipping and replace if necessary.
3. Never install more than one grinding wheel at a time unless
the tool and wheels are designed for that purpose.
4. A large amount of sparks will be created when working with a
grinding wheel. Hold the workpiece so that sparks fly away
from you and other persons or flammable materials. Have a
fully charged fire extinguisher present in the event of a fire.
5. Do not subject the grinding wheel to any lateral pressure as
it may damage the tool or cause it to kickback.
KICKBACK PRECAUTIONS
Kickback is a sudden reaction to a pinched or snagged
workpiece caught in the grinder. The workpiece can be ejected
and inflict a serious injury on the user or a bystander. Kickback
can also damage the tool.
Kickback can be avoided by taking proper precautions:

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1. Maintain a firm grip on the workpiece and position your body
and arms to allow you to resist a kickback. Kickback can propel
the material in the direction of the grinding wheel’s rotation.
2. If kickback occurs, the workpiece may impact the users or
bystander’s body, causing a serious injury.
3. Use special care when working on corners, sharp edges or
flexible material.
4. Only use grinding accessories designed for the tool.
POWER TOOL PRECAUTIONS
1. Do not allow the tool to run without load for an extended
period of time, as this will shorten its life.
2. Do not cover the air vents. Proper cooling of the motor is
necessary to ensure normal life of the tool.
3. Avoid unintentional starts. Ensure the switch is off when
connecting to the power source.
4. Disconnect the power source before installing or servicing
the tool.
5. Only use accessories that are specifically designed for use
with the tool. Ensure the accessory is tightly installed.
6. After making adjustments, make sure that any adjustment
devices are securely tightened.
7. Remove adjusting keys and wrenches before turning the
tool on. A wrench or a key that is left attached to a rotating
part of the tool increases the risk of personal injury.
8. Never force the tool. Excessive pressure could break the
tool, resulting in damage to your workpiece or serious
personal injury. If your tool runs smoothly under no load,
but does not run smoothly under load, then excessive
pressure is being used.
9. Do not touch an operating motor. Motors can operate at
high temperatures and can cause a burn injury.

8712135 8 in. BENCH GRINDER WITH PCB LCD READOUT V1.0
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10. Only use an accessory that exceeds the No Load Speed
rating (see Specifications).
ELECTRICAL SAFETY
WARNING! To reduce risk of electric shock, be certain that the
plug is connected to a properly grounded receptacle.
1. Disconnect tool from power source before cleaning,
servicing, changing parts/accessories or when not in use.
2. Protect yourself against electric shocks when working on
electrical equipment. Avoid body contact with grounded
surfaces. There is an increased chance of electrical shock if
your body is grounded.
3. Do not expose tool to rain or wet conditions. Water entering
a power tool will increase the risk of electric shock.
4. Do not disconnect the power cord in place of using
the ON/OFF switch on the tool. This will prevent an
accidental startup when the power cord is plugged into
the power supply.
4.1 In the event of a power failure, turn off the machine as
soon as the power is interrupted. The possibility of
accidental injury could occur if the power returns and
the unit is not switched off.
5. Do not alter any parts of the tool or accessories. All parts
and accessories are designed with built-in safety features
that may be compromised if altered.
6. Make certain the power source conforms to requirements
of your equipment (see Specifications).
7. When wiring an electrically driven device, follow all
electrical and safety codes, as well as the most recent
Canadian Electrical Code (CE) and Canadian Centre for
Occupational Health and Safety (CCOHS).

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8. This device is only for use on 120 V (single phase) and is
equipped with a 3-prong grounded power supply cord
and plug.
8.1 DO NOT remove the ground prong from the plug. This
will render the tool unsafe.
9. DO NOT use this device with a 2-prong wall receptacle.
9.1 Choose an available 3-prong power outlet.
9.2 Replace 2 prong outlet with a grounded 3-prong
receptacle, installed in accordance with the CE Code
and local codes and ordinances.
WARNING! All wiring should be performed by a
qualified electrician.
POWER CORD
1. Insert the power cord plug directly to the power supply
whenever possible. Use extension cords or surge protectors
only when the tool's power cord cannot reach a power
supply from the work area.
1.1 When operating a power tool outside, use an outdoor
extension cord marked W-A or W. These cords are rated
for outdoor use and reduce the risk of electric shock.
1.2 Use in conjunction with a Ground Fault Circuit
Interrupter (GFCI). If operating a power tool in a damp
location is unavoidable, the use of a GFCI reduces the
risk of electric shock. It is recommended that the GFCI
should have a rated residual current of 30 mA or less.
2. Do not operate this tool if the power cord is frayed or
damaged as an electric shock or surge may occur, resulting
in personal injury or property damage.
2.1 Inspect the tool's power cord for cracks, fraying or
other faults in the insulation or plug before each use.
2.2 Discontinue use if a power cord feels more than
comfortably warm while operating the tool.

8712135 8 in. BENCH GRINDER WITH PCB LCD READOUT V1.0
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2.3 Have the power cord replaced by a qualified
service technician.
3. Keep all connections dry and off the ground to reduce the
risk of electric shock. Do not touch plug with wet hands.
4. Prevent damage to the power cord by observing the
following:
4.1 Do not pull on the cord to disconnect the plug from
an outlet.
4.2 Keep the power cord clear of the tool and the tool's
work path while in operation. The cord should always
stay behind the tool.
4.3 Keep cord away from heat, oil, sharp edges or
moving parts.
5. Do not allow people, mobile equipment or vehicles to pass
over unprotected power cords.
5.1 Position power cords away from traffic areas.
5.2 Place cords in reinforced conduits.
5.3 Place planks on either side of the power cord to create
a protective trench.
6. Do not wrap cord around the tool as sharp edges may cut
insulation or cause cracks if wound too tight. Gently coil
cord and either hang on a hook or fasten with a device to
keep cord together during storage.
UNPACKING
WARNING! Do not operate the tool if any part is missing.
Replace the missing part before operating. Failure to do so
could result in a malfunction and personal injury.
Remove the parts and accessories from the packaging and inspect
for damage. Make sure that all items in the parts list are included.

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ASSEMBLY & INSTALLATION
Numbered references in parenthesis (#1) refer to the included
Parts List. Letter references in parenthesis (A) refer to the
included Identification Key. Dashed numbers in parenthesis
(Fig. 1-1) refer to a specific point in an illustration or image.
TOOL REST AND EYESHIELD ASSEMBLY
COMPONENTS
A 3/8-16 x 3/4 in. Hex Bolt, 4 each
B 3/8 in. Flat Washer, 6 each
C Tool Rest Bracket (left & right),
2 each
D Too l Rest (left & right), 2 each
E 5/16 in. Flat Washer, 2 each
F 5/16-18 x 1 in. Knob, 2 each
G #10-24 x 1/2 in. Pan Head Screw,
4 each
H Upper Eyeshield Bracket, 2 each
(left and right)
I Eyeshield, 2 each
J Lower Eyeshield Bracket, 2 each
K 3/8 in. Lock Washer, 2 each
L 1/4-20 x 3/8 in. Knob, 2 each
M Spark Guard (left and right),
2 each
N 3/8-16 x 1/2 in. Knob, 2 each
TOOL REST ASSEMBLY
1. Place tool rest (D) over tool rest bracket and secure in position
with 5/16 in. flat washer (E) and 5/16-18 x 1 in. knob (F).
2. Attach tool rest bracket to the bottom of the left wheel
guard using two 3/8-16 x 3/4 in. hex head bolts (A) and two
3/8 in. flat washers (B). Tighten bolts finger tight.
Fig. 1

8712135 8 in. BENCH GRINDER WITH PCB LCD READOUT V1.0
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3. Position tool rest so that distance between tool rest and
grinding wheel is less than 1/16 in. Reposition angle of tool
rest if necessary. Secure all knobs and bolts.
4. Mount right tool rest in a similar manner.
EYESHIELD ASSEMBLY
The left upper eyeshield bracket is stamped with an ‘L’ for
identification.
1. Attach spark guard (M) to left wheel guard using 3/8-16 x
1/2 in. knob (N), 3/8 in. flat washer (B) and 3/8 in. Lock
washer (K).
2. Mount left upper eyeshield bracket (H) to eyeshield (I)
using two #10-24 x 1/2 in. pan head screws (G) and lower
eyeshield bracket (J).
3. Slide 1/4-20 x 3/8 in. knob (L) through hole at top of left
spark guard (M) into upper eyeshield bracket (H) and
secure in position.
4. Locate eyeshield in desired position for protecting operator
and secure all knobs and bolts.
5. Mount right eyeshield assembly in a similar manner.
DUST COLLECTION HOSE
DANGER! Empty the shop vacuum of all flammable material
before connecting the vacuum to the grinder. Hot sparks from
the grinder may ignite flammable materials in the shop vacuum.
The dust collection hose attaches to the sides of a T-connector.
Slide the T-Connector’s flanges over the exhaust ports on the
left and right wheel guards. Attach the shop vacuum hose to
the collection hose.
MOUNT TOOL ON A PEDESTAL
The hardware to mount tool is not included. The pedestal must
be secured to the floor to prevent it from tipping over.

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1. Align the tool’s mounting holes with the corresponding
pedestal holes.
2. Slide a flat washer over a 1/4-20 x 1 in. hex head bolt and
insert through the grinder base and pedestal holes.
3. Slide a 1/4 in. flat washer over the end of the bolt and screw
a 1/4-20 in. hex nut onto the bolt end. Tighten until the
space between the tool’s base and pedestal is 1/8 in.
4. Screw a second nut onto the bolt and secure against
the first. This will prevent them from loosening due to
the tool’s vibration.
5. Repeat with other bolt holes.
MOUNT TOOL ON A WOOD WORKBENCH
The hardware to mount the tool is not included.
1. Clean the work area where the tool will be mounted.
2. Position the tool, check that it will be level and there are no
obstructions around it that will interfere with a long
workpiece.
3. Slide a flat washer over a 1/4 x 1 in. wood screw and secure
the grinder in place.
4. Repeat with other bolt holes. Tighten all screws until the
gap between the grinder base and the bench top is 1/8 in.
OPERATION
WARNING! Inspect the grinding wheels before starting the
machine for visible defects such as fissures, cracks or chips. The
wheel may break apart and cause an injury. Replace damaged
grinding wheels immediately (See Care & Maintenance).
CAUTION! Keep your bench grinder clean by removing dust
and grit from working parts, the lower portion of the wheel
guard assembly and the work area surrounding the grinder.
Dust and grit can damage the tool’s internal mechanism.

8712135 8 in. BENCH GRINDER WITH PCB LCD READOUT V1.0
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GRINDING WHEELS
For best grinding results and maintaining good balance, always
keep the wheel(s) properly dressed.
Never force a workpiece against a cold wheel. Use light
pressure until the wheel becomes warm.
We strongly recommend using only balanced wheels on these
grinders. Balanced wheels will add years of life to grinder
bearings and arbor shaft and eliminate the most common
cause of vibration, which will yield more accurate work.
CONTROL PANEL
The control panel contains a digital display and the buttons to
start/stop and adjust the revolutions-per-minute.
Start the grinder with the power ON button (Fig. 2-1). Stop the
grinder with the OFF button (Fig. 2-2).
Set the revolutions per minute to the
maximum speed with the High button
(Fig. 2-3) or lowest speed with the
Low button (Fig. 2-7). Increase or
decrease the speed in 100 RPM
increments by pushing the Up or
Down arrows (Fig. 2-5 or 2-6).
The digital display (Fig. 2-4) will show
the current RPM setting. The display
will flash if the speed cannot be changed when any of the High,
Low, Up or Down buttons are pressed. This may be due to
having already reached the minimum or maximum RPM speed.
Fig. 2

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BASIC GRINDER OPERATIONS
WARNING! Never start the tool with the operator or bystander
in line with the grinding wheel. A damaged grinding wheel
could shatter and the debris may cause an injury.
WARNING! Always wear safety goggles or safety glasses with
side shields during operation of any power tool. If the
operation is dusty, wear the appropriate protective mask.
The bench grinder is equipped with one coarse grinding wheel
(36 grit) and one medium grinding wheel (60 grit). It is the
ideal tool for sharpening tools such as wood chisels, cold
chisels, planer blades, scissors, lawn mower blades, etc.
Because grinders can remove material rapidly, a freshly dressed
wheel and the amount of workpiece pressure applied to the
wheel are keys to efficient grinding. Use the following basic
guidelines to aid in working metals and avoid overheating.
1. Never force the workpiece against the grinding wheel.
Pressing too hard overheats the motor and prematurely
wears down the grinding wheel.
2. Lay the workpiece against the tool rest and ease it into the
grinding wheel. Do not push the point or edge into the
wheel as it may catch and the workpiece may be pulled for
the user’s grasp.
3. Always keep the workpiece constantly moving against the
grinding wheel with light pressure and even motion.
4. Keep the workpiece cool by dipping it in a container of water.
5. Always use the face of the grinding wheel with the wheel
moving downward, into the object being worked.
6. Deburring the edge is done best by using the grinder to
pull burrs from the edge across the bevel angle.
7. Do not grind using the sides of a grinding wheel.

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LAWN MOWER BLADES
1. Ensure there is adequate working space to maneuver
the blade.
2. Sharpen the blade’s beveled side first, then dress the other
side with the grinder or a file.
2.1 Remove any nicks present on the cutting edge. Rest
the blade flat on the tool rest and move the blade side
to side until the edge is nick free.
2.2 Sharpen the bevel. Either adjust the tool rest angle to
match the blade’s bevel angle or hold the blade at the
bevel angle while resting a portion of the blade on the
tool rest for added stability. Remove as little metal as
possible to attain the desired edge. Lightly dress-up
the flat backside of the blade.
2.3 Do not hone the lawn mower blade to a razor-like
sharpness. This increases the likelihood of nicking the
blade and promotes rapid dulling. Use a file or the
bench grinder to slightly dull the cutting edge.
3. After the blade is sharp, check the blade’s balance with an
appropriate shop made jig or commercially available unit.
Balance the blade by progressively removing metal until
balance is attained.
CAUTION! An unbalanced lawn mower blade may cause
excessive vibration, damaging the mower and engine shaft.
SHARPENING SCISSORS
Take the scissors apart, if possible, to make the sharpening
operation easier and safer. Remove material only from the
outside surface and work from the heavy end of the blade
towards the tip. Finish the edge with a whet stone.
SHARPENING TWIST DRILL BITS
Sharpening twist drills can be a tricky operation that even
some experienced mechanics never master.

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Sharpening twist bits freehand will require considerable practice
and dry runs with the grinder OFF to acquire the skill of rotating
the bit while maintaining the original cutting edge angle.
1. Set the grooved tool rest horizontal to the face of the
grinding wheel.
2. Hold the drill shank between the thumb and index finger,
resting the back of the index finger on the tool rest.
3. Be sure that the cutting lip is straight across the face of the
wheel before beginning each stroke
4. When the drill contacts the wheel, push the drill shank
downward and to the left at a slight angle. At the same
time, rotate the drill so the other lip is just visible.
5. Repeat this process on the other lip to sharpen the entire
twist drill.
Consider using a sharpening jig if you anticipate sharpening
numerous bits.
SHARPENING WOOD CHISELS & PLANE IRONS
Sharpening chisels and irons on the bench grinder will produce
razor sharp hollow ground bevels, which must be followed by
honing on a whetstone. Practice the steps below with the
power off before attempting to sharpen a chisel or plane iron.
1. The chisel cutting edge must be free of nicks and be 90° to
the chisel edge. With the tool rest flat, lightly dress the
cutting edge if nicks are present or it’s out of square.
2. Adjust the tool rest’s angle between 25 to 30 degrees in relation
to the grinding wheel’s face. Rest the chisel on the angled tool
rest and move it laterally across the face of the wheel.
3. Occasionally cool the workpiece in water to maintain
its hardness.
4. Continue grinding the cutting edge and bevel until the
bevel length is roughly twice the thickness of the chisel.

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Remove only the material necessary to achieve the desired
bevel angle with a sharp and square cutting edge.
5. This process produces a sharp hollow ground bevel with a
small amount of ‘wire’ burr. Remove this with a final honing
on a whetstone.
REFURBISHING SCREWDRIVER TIPS
Screwdriver tips often get worn or bent out of shape and must
be reshaped by grinding to perform properly.
1. Select a flat-head screw with a slot the same width as the
screwdriver blade tip.
2. Grind screwdriver tip square and remove all gaps, nicks and
twists in the screwdriver blade. Apply only light pressure to
the blade while moving it back and forth across the
grinding wheel face.
3. Turn the screwdriver frequently to keep both sides parallel.
4. If ground correctly, the tip should fit completely into the
screw slot with no visible gaps.
CARE & MAINTENANCE
1. Maintain the tool with care. A tool in good condition is
efficient, easier to control and will have fewer problems.
2. Inspect the tool fittings, alignment and power supply cord
periodically. Have damaged or worn components repaired
or replaced by an authorized technician. Only use identical
replacement parts when servicing.
3. Follow instructions for lubricating and changing accessories.
4. Only use accessories intended for use with this tool.
5. Maintain the tool’s labels and name plates. These carry
important information. If unreadable or missing, contact
Princess Auto Ltd. for replacements.

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6. Wheels should be dressed periodically to maintain grinding
efficiency, especially if they become clogged from grinding
soft metals. Use a grinding wheel dresser to restore the
wheel’s original shape.
6.1 Dress the grinding wheel face only. Dressing the wheel
sides can cause it to become too thin for safe use.
7. Keep all parts in working order. Check to determine that
the guard or other parts will operate properly and perform
their intended function.
8. A guard or other part that is damaged should be properly
repaired or replaced. Do not perform makeshift repairs.
9. Disconnect tool when changing grinding wheels.
10. Replace a cracked wheel immediately and use only the
flanges supplied with the grinder.
11. Replacement wheels must have a minimum rated speed of
3,450 RPM and a maximum diameter of 8 in.
WARNING! Only qualified service personnel should repair the
tool. An improperly repaired tool may present a hazard to the
user and/or others.
WHEEL DRESSING
A grinding wheel may become unbalanced due to irregular
wear or it is loaded with ground material. The grinding wheel
must be trued and dressed.
Truing or dressing the wheel is best done using a star-wheel
dresser, a silicon carbide stick type dresser or a diamond faced
dressing tool.
Dress the wheel by moving the dresser forward on the tool rest
until it just touches the highpoint on the face of the wheel, then
dress the wheel by moving the dresser back and forth across
the wheel face.
Repeat this procedure until the face of the grinding wheel is
clean and the corners of the wheels are square.

8712135 8 in. BENCH GRINDER WITH PCB LCD READOUT V1.0
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CHANGING THE GRINDING WHEELS
WARNING! Use only grinding wheels rated for 3,450 RPM or
higher with a 5/8 in. arbor hole and the appropriate sized bushing.
Never use a grinding wheel rated lower than 3,450 RPM or
attempt to machine an undersized wheel to fit the arbor. The
grinding wheel may fragment during grinding and cause an injury.
1. Prevent the shaft from rotating by placing a wedge
between the wheel and the tool rest.
2. Remove the five bolts (#1) attaching the protective side
cover (#2) to the grinder; then remove the side cover.
3. Facing the front of the bench grinder: to replace the wheel
on the left side, turn the arbor nut (#3) clockwise to loosen
and counterclockwise to tighten.
4. To replace the wheel on the right side, turn
counterclockwise to loosen and clockwise to tighten.
5. Remove the arbor nut (#3), outer flange (#4) and the old
wheel (#5).
6. Install the replacement wheel and outer flange on the shaft.
Make sure the wheel is a tight fit on the shaft.
7. Replace the arbor nut and tighten enough to drive the
wheel and prevent slippage. Excessive tightening can cause
the wheel to crack prior to or during operation.
8. Replace the side cover. Reinsert the three bolts and tighten
the side cover in place.
9. Adjust the tool rest (#14) and spark shield guard (#15)
distance from the grinding wheel. Maintain a separation of
1/16 in. or less as the wheel diameter decreases from use.
10. Adjust the eye shield position over the grinding wheel.
11. Rotate the wheel by hand to check free movement and
proper adjustments.
Many grinding wheels use removable and adjustable arbor
bushings to allow adaptation to various machine arbor
diameters. Save this bushing for future use if not needed to
install the replacement wheel.