M1107 Bench grinder
Troubleshooting
This section covers the most common problems and corrections with this type of machine. WARNING! DO NOT make any adjustments until power is disconnected and moving parts have come to a complete stop!
PROBLEM | POSSIBLE CAUSE | CORRECTIVE ACTION | |||
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Motor will not start; fuses | 1. | Open circuit in motor or loose | 1. | Inspect/repair all lead connections on motor for loose or open | |
or circuit breakers blow. |
| connections. |
| connections. | |
| 2. | Start capacitor is at fault. | 2. | Replace start capacitor. | |
| 3. | Short circuit in motor or loose | 3. | Inspect all connections on motor for loose or shorted terminals or | |
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| connections. |
| worn insulation. | |
| 4. | Incorrect fuses or circuit breakers | 4. | Install correct fuses or circuit breakers. | |
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| in power supply. |
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Motor overheats, stalls | 1. | Motor overloaded. | 1. | Reduce load on motor. | |
(resulting in blown fuses or | 2. | Short circuit in motor or loose | 2. | Inspect connections on motor for loose or shorted terminals or | |
tripped circuit). |
| connections. |
| worn insulation. | |
| 3. | Depth of cut too great. | 3. | Slow down the rate of movement of the workpiece into wheel. | |
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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 is not held in place | 2. | Use a holding device to firmly retain the workpiece. | |
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| firmly. |
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| 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 | 1. | Impurity on wheel surface. | 1. | Dress the grinding wheel. | |
2. | Workpiece not being held tightly. | 2. | Use a holding device to firmly retain the workpiece. | ||
workpiece. | |||||
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Burning spots or cracks in | 1. | Improper type of grinding wheel. | 1. | Try a wheel that 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. | |
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Wheel dulls quickly, grit | 1. | Depth of cut too great. | 1. | Slow down the rate of movement of the workpiece into wheel. | |
2. | Wheel is too soft. | 2. | Wheel too soft for the material being ground, select harder | ||
falls off. | |||||
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| 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 | |
shows burn marks. |
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| bond. | |
| 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. | Wrong material is being ground. | 4. | Grind ferrous metals only. | |
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MAINTENANCE
