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Operation
Symptom
Possible Cause
Tool loose in
1. Cutter/tooling loose.
spindle.
2. Cutting tool not fully drawn up into spindle
taper.
3. Debris on cutting tool or in spindle taper.
4. Taking too big of a cut.
Breaking tools
1. Spindle speed/feed rate too fast for depth of
or cutters.
cut, cutting tool size, or workpiece material.
2. Improper or no cutting fluid/cutting tool getting
too hot.
3. Dull/incorrect cutting tool.
4. Cutting tool too small.
5. Spindle extended too far down.
6. Taking too big of a cut.
Table hard to
1. Table locked.
move.
2. Chips loaded up on ways.
3. Table ways and leadscrews need lubrication.
4. X- and Y-gibs too loose.
5. Table limit stops interfering.
Headstock
1. Headstock locked.
hard to raise or
2. Column ways and leadscrew need
lower.
lubrication.
3. Z-axis gib too tight.
Workpiece or
1. Table not locked.
tool vibrates or
2. Workpiece loose.
chatters during
3. Cutter/tooling loose.
operation.
4. Spindle speed/feed rate too fast.
5. X-, Y-, or Z gib(s) too loose.
6. Spindle extended too far down.
7. Chuck or cutter at fault.
Bad surface
1. Spindle speed/feed rate too fast.
finish.
2. Workpiece loose.
3. Table not locked.
4. Dull/incorrect cutting tool.
5. Wrong rotational direction of cutting tool.
6. Spindle extended too far down.
Cutting results
1. Table or headstock travel inconsistent.
not square.
Threads not
1. Cutting edge chipped on cutting tool.
smooth.
2. Cutting tool not centered.
3. Chip packing.
4. Galling (adhesion between surfaces).
Model G0935 (Mfd. Since 04/21)
Possible Solution
1. Secure cutter/tooling (Page 29).
2. Tighten drawbar (Page 31).
3. Clean cutting tool and spindle taper.
4. Lessen depth of cut and allow chips to clear.
1. Reduce spindle speed (Page 31)/reduce feed rate/
take lighter cut.
2. Use proper cutting fluid for operation.
3. Sharpen/replace cutting tool.
4. Use larger cutting tool and slower feed rate.
5. Fully retract spindle and lower headstock to increase
rigidity.
6. Lessen depth of cut and allow chips to clear.
1. Loosen table lock handles (Page 27).
2. Frequently clean away chips during operations.
3. Clean/lubricate table ways and leadscrews (Page 37).
4. Adjust gibs (Page 43).
5. Adjust table limit stops out of the way (Page 27).
1. Loosen headstock lock handle (Page 28).
2. Clean/lubricate column ways and leadscrew
(Page 37).
3. Adjust gib (Page 43).
1. Tighten table lock handles (Page 27).
2. Use correct holding fixture and reclamp workpiece.
3. Secure cutter/tooling (Page 29).
4. Reduce spindle speed (Page 31)/reduce feed rate.
5. Adjust gib(s) (Page 43).
6. Fully retract spindle and lower headstock to increase
rigidity.
7. Replace unbalanced chuck; replace/resharpen cutter;
use correct depth of cut.
1. Reduce spindle speed (Page 31)/feed rate.
2. Use correct holding fixture and reclamp workpiece.
3. Tighten table lock handles (Page 27).
4. Sharpen/replace cutting tool; select better tool for
operation.
5. Check for proper direction of cutting tool rotation.
6. Fully retract spindle and lower headstock to increase
rigidity.
1. Adjust gib(s) (Page 43).
1. Replace cutting tool.
2. Center cutting tool.
3. Use spiral point/spiral fluted taps; reduce number of
flutes to provide extra chip room.
4. Use proper cutting fluid; reduce tapping speed.
-41-
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