Grizzly G0836 Owner's Manual page 42

Mill/Drill Operation
Symptom Possible Cause
Control Panel FWD- 1. Machine in "FAULT" mode (Fault indicator
REV switch does
light illuminated).
not work.
2. Shorted/disconnected wiring.
Tool loose in 1. Cutting tool not fully drawn up into spindle
spindle.
taper.
2. Debris on cutting tool or in spindle taper.
3. Taking too big of cut.
Breaking tools or 1. Spindle speed/feed rate too fast for depth
cutters.
of cut, cutting tool size, or workpiece
material.
2. Cutting tool too small.
3. Taking too big of a cut.
4. Improper or no cutting lubricant/cutting tool
getting too hot.
5. Spindle extended too far down.
Workpiece vibrates 1. Table locks not tight.
or chatters during
2. Workpiece not secure.
operation.
3. Spindle speed/feed rate too fast.
4. Spindle extended too far down.
Table is hard to 1. Table locks tightened down.
move.
2. Chips loaded up on ways.
3. Ways are dry and need lubrication.
4. Table limit stops interfering.
5. Gibs too tight.
Bad surface finish. 1. Spindle speed/feed rate too fast.
2. Dull/incorrect cutting tool.
3. Wrong rotation direction of cutting tool.
4. Workpiece not secure.
5. Spindle extended too far down during or at
beginning of operation.
6. Table locks not tight.
Threads not 1. Cutting edge chipped on cutting tool.
smooth.
2. Cutting tool not centered.
3. Chip packing.
4. Galling (adhesion between surfaces).
Cutting results not 1. Table travel inconsistent.
square.
Spindle speed 1. Shorted/disconnected wiring/plugs.
readout does not
display reading.
2. Spindle speed sensor has gone bad.
3. Spacing between sensor and scale
incorrect
-40-
Possible Solution
1. Turn spindle speed dial OFF to clear fault, then
select FWD or REV (Page 4).
2. Inspect circuit boards, wiring connections. Replace/
repair as necessary.
1. Tighten drawbar (do not overtighten) (Page 28).
2. Clean tool and spindle taper.
3. Lessen depth of cut and allow chips to clear.
1. Reduce spindle speed (Page 29); reduce feed rate;
take lighter cut.
2. Use larger cutting tool and slower feed rate.
3. Reduce depth of cut and allow chips to clear.
4. Use proper lubricant for operation.
5. Fully retract spindle and lower headstock. This
increases rigidity.
1. Tighten table locks (Page 26).
2. Properly clamp workpiece on table or in vise.
3. Reduce spindle speed (Page 29); reduce feed rate.
4. Fully retract spindle and lower headstock. This
increases rigidity.
1. Release table locks (Page 26).
2. Frequently clean away chips that load up during
milling operations.
3. Lubricate ways (Page 36).
4. Adjust table travel limit stops out of the way
(Page 27).
5. Adjust gibs (Page 42).
1. Reduce spindle speed (Page 29); reduce feed rate.
2. Sharpen/replace cutting tool; select better tool for
operation.
3. Check for proper direction of cutting tool rotation.
4. Properly clamp workpiece on table or in vise.
5. Fully retract spindle and lower headstock. This
increases rigidity.
6. Tighten table locks (Page 26).
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 coolant; reduce tapping speed.
1. Adjust gibs (Page 42).
1. Inspect circuit boards, sensors, plugs, and wiring
connections. Repair/replace as necessary.
2. Test/replace as necessary.
3. Adjust spacing between sensor and scale.
Model G0836 (Mfd. Since 09/17)