Grizzly G0827 Owner's Manual page 58

Symptom Possible Cause
Machine has 1. Workpiece loose.
vibration or noisy
2. Cutter at fault.
operation.
3. V-belt(s) worn, loose, or misaligned.
4. Motor or component loose.
5. Motor fan rubbing on fan cover.
8. Pulley loose.
7 Arbor bearings at fault.
8. Motor bearings at fault.
9. Gearbox at fault.
Mill Operations
Symptom Possible Cause
Tool loose in 1. Tool 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 too fast for
cutters.
material type or cutting depth.
2. Cutting tool too small.
3. Spindle extended too far down.
4. Cutting tool getting too hot.
Workpiece or tool 1. Table locks not tight.
vibrates or chatters
2. Workpiece loose/improperly secured.
during operation.
3. Spindle speed/feed rate too fast for
material type or cutting depth.
4. Spindle extended too far down.
5. Quill lock not tight.
6. Gibs too loose in table.
Table hard to move. 1. Table locks tightened.
2. Chips loaded up on table ways.
3. Ways dry and need lubrication.
4. Table limit stops interfering.
5. Gibs too tight.
6. X/Y-Axis leadscrews binding.
Table hard to raise. 1. Table lock(s) tightened.
2. Gibs too tight.
3. Z-axis leadscrew binding.
Spindle overheats. 1. Poor spindle bearing lubrication.
2. Mill operated at high speeds for extended
period.
3. Spindle bearings too tight.
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Possible Solution
1. Use correct holding fixture and reclamp workpiece.
2. Replace/resharpen cutter; use correct feed rate.
3. Inspect/replace belts with new matched set
(Page 53). Realign pulleys if necessary.
4. Inspect/replace damaged bolts/nuts, and retighten
with thread locking fluid.
5. Fix/replace fan cover; replace loose/damaged fan.
6. Re-align/replace pulley/shaft, pulley set screw, and
key.
7. Replace arbor housing bearings; replace arbor.
8. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
9. Rebuild gearbox for bad gear(s)/bearing(s).
Possible Solution
1. Tighten drawbar (Page 33).
2. Clean tool and spindle taper.
3. Lessen depth of cut and allow chips to clear.
1. Reduce spindle speed (Page 36) or use slower feed
rate, or a shallower depth of cut, or both.
2. Use larger cutting tool.
3. Fully retract spindle (Page 38) and raise table
(Page 30). This increases rigidity.
4. Use coolant or oil for appropriate application.
1. Tighten table locks (Page 30).
2. Use correct holding fixture and reclamp workpiece.
3. Reduce spindle speed (Page 36) or use slower feed
rate, or a shallower depth of cut, or both.
4. Fully retract spindle (Page 38) and raise table
(Page 30). This increases rigidity.
5. Tighten quill lock (Page 38).
6. Tighten gibs (Page 61).
1. Fully release table locks (Page 30).
2. Frequently clean chips or debris away from ways.
3. Lubricate ways.
4. Move table limit stops out of the way.
5. Adjust gibs (Page 61).
6. Clean and lubricate leadscrews; adjust leadscrew
backlash or decrease bearing preload.
1. Loosen table locks (Page 61).
2. Adjust gibs (Page 61).
3. Clean and relubricate Z-axis leadscrew and bevel
gears (Page 50). Decrease leadscrew bearing
preload.
1. Lubricate spindle bearings.
2. Allow mill to cool.
3. Properly adjust spindle bearing preload.
Model G0827 (Mfd. Since 11/17)