Grizzly G0793 Owner's Manual page 40

Symptom Possible Cause
Spindle rotates in 1. Phase polarity reversed at incoming power
wrong direction.
connections.
2. Spindle motor or speed/direction switch
wired incorrectly.
Coolant pump 1. Inadequate ammount of coolant in
doesn't work.
reservoir.
2. Emergency stop button engaged/at fault.
3. Master power switch off/at fault.
4. Coolant pump hose clogged with debris.
5. Coolant pump switch at fault.
6. Coolant pump at fault.
Drill Press Operations
Symptom Possible Cause
Tool loose in spindle. 1. Cutting tool is not fully drawn up into
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.
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.
Spindle overheats. 1. Poor spindle bearing lubrication.
2. Spindle bearings too tight.
3. Machine operated at high speeds for
Thread is not 1. Cutting edge chipped on cutting tool.
smooth.
2. Cutting tool not centered.
3. Chip packing.
4. Galling.
Tool Breakage. 1. Wrong tap choice.
2. Improper or no lubricant.
3. Misalignment between tap and pilot hole.
4. Cutting tool/bit is worn.
5. Wrong size pilot hole.
Oil not flowing in oil- 1. Headstock oil low/out.
flow sight glass
2. Headstock oil pump at fault.
-38-
spindle taper.
extended period.
Possible Solution
1. Correct incoming power connections (Page 17).
2. Verify spindle motor (Page 46) and speed/direction
switch wiring (Page 44).
1. Add or change coolant in reservoir (Page 36)
2. Rotate button to reset/replace it.
3. Turn master power switch to ON position/replace it.
4. Clean coolant pump and replace coolant (Page 36).
5. Replace coolant pump switch.
6. Replace coolant pump.
Possible Solution
1. Tighten drawbar.
2. Clean cutting tool and spindle taper.
3. Lessen depth of cut and allow chips to clear.
1. Set spindle speed correctly or use slower feed rate.
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 instead.
1. Tighten table locks.
2. Properly clamp workpiece on table or in vise.
3. Set spindle speed correctly or use slower feed rate.
4. Fully retract spindle and raise table instead.
5. Tighten quill lock lever.
1. Set spindle speed correctly or use slower feed rate.
2. Sharpen cutting tool or select better one for task.
3. Check for proper cutting tool rotation.
4. Properly clamp workpiece on table or in vise.
5. Fully retract spindle and raise table instead.
1. Lubricate spindle bearings.
2. Properly adjust spindle bearing preload.
3. Allow machine to cool.
1. Replace tool.
2. Center tool.
3. Use spiral point/spiral fluted taps and or reduce the
number of flutes to provide extra chip room.
4. Use proper coolant; reduce tapping speed.
1. Select better tap for task.
2. Use proper lubricant for operation.
3. Fix alignment between tap and pilot hole.
4. Sharpen cutting tool/replace.
5. Adjust pilot hole size accordingly.
1. Replace headstock oil (Page 33).
2. Replace headstock oil pump.
Model G0793 (Mfd. Since 02/15)