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M1109 Combo Lathe/Mill
This section covers the most common lathe problems. DO NOT make any adjustments until the lathe is
disconnected from power and all moving parts have come to a complete stop.
Motor & Electrical
SYMPTOM
Motor will not
1. Incorrect lathe operation.
start.
2. Main power switch is OFF.
3. Emergency switch is pushed in.
4. Circuit breaker or fuse is at fault.
5. No voltage or open connection.
6. Motor is at fault.
Fuses or circuit
1. Short circuit in line cord or plug.
breakers trip
open.
2. Short circuit in motor or loose connections.
3. Incorrect fuses or circuit breakers in power
supply.
Carriage hard to
1. Chips have loaded up on bedways.
move.
2. Bedways are dry and in need of lubrication.
3. Longitudinal stops are interfering.
4. Gibs are too tight.
Machine is loud
1. Excessive depth of cut.
when cutting.
2. RPM or Feed Rate wrong for operation.
Overheats or
3. Dull cutters.
bogs down in the
cut.
Bad surface fin-
1. Wrong RPM or feed rate.
ish.
2. Dull tooling or tool not centered correctly.
3. Too much play in gibs.
Gear change
1. Gears not aligned in headstock.
levers will not
shift into posi-
tion.
Can't remove
1. Quill had not retracted all the way back into
tapered tool
the tailstock.
from quill.
Troubleshooting
POSSIBLE CAUSE
-41-
CORRECTIVE ACTION
1. Use the spindle direction ON/OFF lever.
2. Turn the main power switch ON at the back of the
lathe.
3. Rotate emergency switch so it pops out.
4. Seek an electrician to troubleshoot and repair the
shop power supply.
5. Test circuit, replace wires and connections as
required.
6. Replace motor.
1. Inspect cord or plug for damaged insulation and
shorted wires.
2. Inspect all connections on motor for loose or
shorted terminals or worn insulation.
3. Install correct fuses or circuit breakers.
1. Frequently clean away chips that load up during
turning operations.
2. Lubricate bedways and handles.
3. Check to make sure that stops are floating and not
hitting the center stop.
4. Loosen gib screw(s) slightly.
1. Decrease depth of cut.
2. Refer to RPM Feed rate chart for appropriate rates.
3. Sharpen or replace cutters.
1. Adjust for appropriate RPM and feed rate.
2. Sharpen tooling and/or center tool correctly.
3. Tighten gibs.
1. Rotate spindle by hand until gear falls into place.
1. Turn the quill handwheel until it forces taper out
of quill.
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