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G5963 Surface Grinder -21-
This section covers the most common processing problems encountered in grinding and what to do about
them. Do not make any adjustments until surface grinder is unplugged and moving parts have come to a
complete stop.
TROUBLESHOOTING
SYMPTOM
Motor will not start.
Motor will not start; fuses or
circuit breakers blow.
Motor overheats.
Motor stalls (resulting in
blown fuses or tripped cir-
cuit).
Machine slows when oper-
ating.
Wavy condition on surface
of workpiece.
Lines on surface of work-
piece.
Burning spots or cracks in
the workpiece.
Wheel dulls quickly, grit falls
off.
Wheel clogs and workpiece
shows burn marks.
POSSIBLE CAUSE
1. Low voltage.
2. Open circuit in motor or loose
connections.
1. Short circuit in line cord or plug.
2. Short circuit in motor or loose
connections.
3. Incorrect fuses or circuit break-
ers in power line.
1. Motor overloaded.
2. Air circulation through the motor
restricted.
1. Short circuit in motor or loose
connections.
2. Low voltage.
3. Incorrect fuses or circuit breakers
in power line.
4. Motor overloaded.
1. Feed rate too high.
2. Depth of cut too great.
1. Machine vibrating.
2. Grinding wheel not balanced.
3. Wheel is too hard.
4. Vertical slide loose.
1. Improper cross feed
2. Improper feed rate.
3. Impurity on wheel surface.
4. 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. Feed rate too fast.
3. Wheel is too soft.
4. Bad wheel dress.
5. Defective wheel bonding.
1. Wheel is too hard.
2. Feed rate too slow.
3. Bad wheel dress.
4. Coolant required.
CORRECTIVE ACTION
1. Check power line for proper voltage.
2. Inspect all lead connections on motor for loose or open connec-
tions.
1. Inspect cord or plug for damaged insulation and shorted wires.
2. Inspect all connections on motor for loose or shorted terminals or
worn insulation.
3. Install correct fuses or circuit breakers.
1. Reduce load on motor.
2. Clean out motor to provide normal air circulation.
1. Inspect connections on motor for loose or shorted terminals or
worn insulation.
2 Correct the low voltage conditions.
3. Install correct fuses or circuit breakers.
4. Reduce load on motor.
1. Slow down the rate of movement of the sliding table into wheel.
2. Reduce depth of cut by raising vertical adjustment.
1. Make sure machine is level and on a solid surface.
2. Balance the wheel.
3. Use softer wheel, or reduce the feed rate.
4. Adjust gibs on vertical slide.
1. Use smaller cross feed increments per wheel pass.
2. Vary the rate of movement of the sliding table into wheel.
3. Dress Wheel again
4. Check vice or chuck for tightness to the table.
1. Try a wheel which is soft or a coarser grit.
2. Slow down the rate of movement of the sliding table into wheel.
3. Add optional coolant system or introduce coolant by hand.
1. Raise wheel to reduce depth of cut.
2. Slow down the rate of movement of the sliding table into wheel.
3. Wheel too soft for the material being ground, select harder bond.
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 sliding table into wheel.
3. Dress the wheel.
4. Add optional coolant system or introduce coolant by hand.