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