-15-
M1051 6" Bench Grinder
MAINTENANCE
TroubleshootingPROBLEM
Motor will not start; fuses
or circuit breakers blow.
Motor overheats, stalls
(resulting in blown fuses or
tripped circuit).
Wavy condition on surface
of workpiece.
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.
POSSIBLE CAUSE
1. Open circuit in motor or loose
connections.
2. Start capacitor is at fault.
3. Short circuit in motor or loose
connections.
4. Incorrect fuses or circuit breakers
in power supply.
1. Motor overloaded.
2. Short circuit in motor or loose
connections.
3. Depth of cut too great.
1. Machine vibrating.
2. Workpiece is not held in place-
firmly.
3. Wheel face uneven.
4. Wheel is too hard.
1. Impurity on wheel surface.
2. Workpiece not being held tightly.
1. Improper type of grinding wheel.
2. Improper feed rate.
3. Coolant required.
1. Depth of cut too great.
2. Wheel is too soft.
3. Wheel diameter too small.
4. Bad wheel dress.
5. Defective wheel bonding.
1. Wheel is too hard.
2. Feed rate too slow.
3. Bad wheel dress.
CORRECTIVE ACTION
1. Inspect/repair all lead connections on motor for loose or open
connections.
2. Replace start capacitor.
3. Inspect all connections on motor for loose or shorted terminals or
worn insulation.
4. Install correct fuses or circuit breakers.
1. Reduce load on motor.
2. Inspect connections on motor for loose or shorted terminals or
worn insulation.
3. Slow down the rate of movement of the workpiece into wheel.
1. Make sure 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.
1. Dress the grinding wheel.
2. Use a holding device to firmly retain the workpiece.
1. Try a wheel which is softer style or a coarser grit.
2. Slow down the rate of movement of the workpiece into wheel.
3. Add optional coolant system or introduce coolant by hand.
1. Slow down the rate of movement of the workpiece into wheel.
2. Wheel too soft for the material being ground, select harder
bond.
3. Replace the wheel.
4. Dress the wheel.
5. Consult manufacturer of grinding wheel.
1. Wheel too hard for the material being ground, select softer
bond.
2. Increase the rate of movement of the workpiece into wheel.
3. Dress the wheel.