TROUBLESHOOTING
This section covers the most common problems encountered in grinding and what to do about them. Do not make any adjustments until 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. |
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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. | Depth of cut too great. | 1. | Slow down the rate of movement of the workpiece into wheel. |
ating. |
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Wavy condition on surface | 1. | Machine vibrating. | 1. | Make sure machine is securely mounted on a solid surface. |
of workpiece. | 2. | Workpiece not being held firmly. | 2. | Use a holding device to firmly retain the workpiece. |
| 3. | Wheel face uneven. | 3. | Dress the grinding wheel. |
| 4. | Wheel is too hard. | 4. | Use softer wheel, or reduce the feed rate. |
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Lines on surface of work- | 1. | Impurity on wheel surface. | 1. | Dress the grinding wheel. |
piece. | 2. | Workpiece not being held tightly. | 2. | Use a holding device to firmly retain the workpiece. |
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Burning spots or cracks in | 1. | Improper type of grinding wheel. | 1. | Try a wheel which is softer style or a coarser grit. |
the workpiece. | 2. | Improper feed rate. | 2. | Slow down the rate of movement of the workpiece 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. | Slow down the rate of movement of the workpiece into wheel. |
off. | 2. | Wheel is too soft. | 2. | Wheel too soft for the material being ground, select harder bond. |
| 3. | Wheel diameter too small. | 3. | Replace the wheel. |
| 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 workpiece into wheel. |
| 3. | Bad wheel dress. | 3. | Dress the wheel. |
| 4. | Coolant required. | 4. | Add optional coolant system or introduce coolant by hand. |
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!
Disconnect power to the machine when perform- ing any maintenance, assembly or adjust- ments. Failure to do this may result in serious personal injury.
H4378/H4379 Slimline Bench Grinder |