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PROBLEM /
FAULT
Machine does
1. Emergency stop button
not start or a
engaged or at fault.
circuit breaker
2. Variable speed dial in
trips.
OFF position or at fault.
3. Spindle direction switch
turned to "0" or at fault.
4. Blown fuse.
5. Incorrect power supply
voltage.
6. Power supply circuit
breaker tripped or fuse
blown.
7. Wiring open/has high
resistance.
8. Motor brushes at fault.
9. On/Off switch at fault.
Machine
1. Feed rate/cutting speed
stalls or is
too fast.
underpowered.
2. Wrong workpiece
material.
3. Machine undersized for
task.
4. Motor overheated.
5. Computer board at fault.
6. Motor speed dial at fault.
7. Timing belt slipping.
8. Motor brushes at fault.
9. Pulley/sprocket slipping
on shaft.
Machine has
1. Motor or component
vibration or
loose.
noisy operation.
2. Pulley loose.
3. Motor fan rubbing on fan
cover.
4. Motor bearings at fault.
5. Cutting tool chattering.
6. Workpiece or chuck at
fault.
Bad surface
1. Wrong spindle speed or
finish.
feed rate.
2. Dull tooling or wrong tool
selection.
3. Tool height not at spindle
centerline.
4. Too much play in gibs.
Tapered tool
1. Quill not fully retracted
difficult to
into tailstock.
remove from
2. Contaminants not
tailstock quill.
removed from taper
before inserting into quill.
TROUBLESHOOTING
EN
PROBABLE CAUSE
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
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.
1. Adjust for appropriate spindle speed and
feed rate.
2. Sharpen tooling or select a better tool for the
intended operation.
3. Adjust tool height to spindle centerline.
4. Tighten gibs.
1. Turn quill handwheel until tapered tool is
forced out of quill.
2. Clean taper and bore, then re-install tool.
130
cover;
replace
loose/
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