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PROBLEM /
PROBABLE CAUSE
FAULT
Machine does not
1. Emergency
start or a circuit
breaker trips.
2. Variable speed dial
3. Spindle
4. Blown fuse.
5. Incorrect
6. Power supply circuit
7. Wiring open/has high
8. Motor
9. On/Off switch at fault.
Machine stalls or
1. Feed
is underpowered.
2. Wrong
3. Machine undersized
4. Motor overheated.
5. Computer board at
6. Motor speed dial at
7. Timing belt slipping.
8. Motor
9. P u l l e y / s p r o c k e t
Machine has
1. Motor or component
vibration or noisy
operation.
2. Pulley loose.
3. Motor fan rubbing on
4. Motor
5. Cutting
6. Workpiece or chuck
TROUBLESHOOTING
EN
stop
button engaged or at
fault.
in OFF position or at
fault.
direction
switch turned to "0" or
at fault.
power
supply voltage.
breaker
tripped
or
fuse blown.
resistance.
brushes
at
fault.
rate/cutting
speed too fast.
workpiece
material.
for task.
fault.
fault.
brushes
at
fault.
slipping on shaft.
loose.
fan cover.
bearings
at
fault.
tool
chattering.
at fault.
39
SUGGESTED REMEDY
1. Release the emergency stop button.
Press On button to reset; replace if not
working properly.
2. Turn variable speed dial past "0".
Ensure dial has correct voltage.
Replace if faulty.
3. Turn spindle direction switch to "F" or
"R". Ensure dial has correct voltage.
Replace if faulty.
4. Replace fuse/ensure no shorts.
5. Ensure correct power supply voltage.
6. Ensure circuit is sized correctly and
free of shorts. Reset circuit breaker or
replace fuse.
7. Check/fi x broken, disconnected, or
corroded wires.
8. Remove/replace brushes.
9. Replace switch.
10. Test/repair/replace.
1. Decrease feed rate/cutting speed.
2. Use correct type/size of metal.
3. Inspect and replace if at fault.
4. Use sharp bits; reduce feed rate/depth
of cut.
5. Clean motor, let cool, and reduce
workload.
6. Test and replace if at fault.
7. Tension/replace belt; ensure pulleys
are aligned.
8. Remove/replace brushes.
9. Replace loose pulley/shaft.
10. Test/repair/replace.
1. Inspect/replace damaged bolts/nuts,
and retighten with thread locking fl uid.
2. Realign/replace shaft, pulley, setscrew,
and key.
3. Fix/replace fan cover; replace loose/
damaged fan.
4. Test by rotating shaft; rotational
grinding/loose shaft requires bearing
replacement.
5. Replace/sharpen cutting tool; index
tool to spindle centerline; use correct
feed rate and cutting RPM.
6. Properly secure or center workpiece in
chuck or faceplate; replace defective
chuck.
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