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Mill
Symptom
Possible Cause
Tool loose in
1. Tool is not fully drawn up into spindle taper.
spindle.
2. Debris on tool or in spindle taper
3. Taking too big of a cut.
Breaking tools or
1. Spindle speed/feed rate is too fast.
cutters.
2. Cutting tool is too small.
3. Cutting tool getting too hot.
4. Taking too big of a cut.
5. Spindle extended too far down.
Workpiece or tool
1. Table locks not tight.
vibrates or chatters
2. Workpiece not secure.
during operation.
3. Spindle speed/feed rate is too fast.
4. Spindle extended too far down.
5. Quill lock lever not tight.
6. Gibs too loose in table.
Table is hard to
1. Table locks are tightened down.
move.
2. Chips have loaded up on ways.
3. Ways are dry and need lubrication.
4. Table limit stops are interfering.
5. Gibs are too tight.
Headstock is hard to
1. Headstock lock(s) or gib is at fault.
raise.
2. Headstock leadscrew is binding.
3. Gib is too tight.
Bad surface finish.
1. Spindle speed/feed rate is too fast.
2. Dull or incorrect cutting tool.
3. Wrong rotation of cutting tool.
4. Workpiece not secure.
5. Spindle extended too far down.
Cutting results not
1. Table and spindle are not at 90° to each
square.
other.
2. Table travel is inconsistent.
Spindle overheats.
1. Poor spindle bearing lubrication.
2. Spindle bearings too tight.
3. Mill operated at high speeds for extended
period.
Lack of power at
1. Belts are loose.
spindle.
2. Wrong voltage.
Spindle does not
1. Poorly adjusted return spring.
fully retract.
2. Worn return spring.
Spindle switch does
1. Shorted/disconnected wiring.
not work.
-52-
Possible Solution
1. Tighten drawbar.
2. Clean tool and spindle taper.
3. Lessen depth of cut and allow chips to clear.
1. Set spindle speed correctly or use slower feed rate
(Page 34).
2. Use larger cutting tool and slower feed rate.
3. Use coolant or oil for appropriate application.
4. Lessen depth of cut and allow chips to clear.
5. Fully retract spindle and raise table (Pages 30 and
37). This increases rigidity.
1. Tighten table locks (Page 30).
2. Properly clamp workpiece on table or in vise.
3. Set spindle speed correctly or use slower feed rate
(Page 34).
4. Fully retract spindle and raise table (Pages 30 and
37). This increases rigidity.
5. Tighten quill lock lever (Page 37).
6. Tighten gibs (Page 54).
1. Fully release table locks (Page 30).
2. Frequently clean away chips or debris.
3. Lubricate ways (Page 48).
4. Make sure that table limit stops are not in the way.
5. Adjust gibs (Page 54).
1. Loosen/replace lock lever and adjust gib (Pages 37
and 54).
2. Clean and relubricate headstock leadscrew and
gears (Page 48).
3. Adjust gib (Page 54).
1. Set spindle speed correctly or use slower feed rate
(Page 34).
2. Sharpen cutting tool or select one that better suits
the operation.
3. Check for proper cutting tool rotation.
4. Properly clamp workpiece on table or in vise.
5. Fully retract spindle and raise table (Pages 30 and
37). This increases rigidity.
1. Tram the spindle (Page 57).
2. Adjust gibs (Page 54).
1. Replace spindle bearings.
2. Properly adjust spindle bearing preload.
3. Allow mill to cool.
1. Properly tension belts.
2. Correct voltage.
1. Increase return spring tension.
2. Replace return spring.
1. Inspect wiring connections. Replace/repair as
necessary.
Model G0796/G0797 (Mfd. Since 1/18)
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