Grizzly G0795Z, Owner'S Manual

Page: 41 / 64

Model G0795Z (Mfd. Since 06/17)
-39-
Symptom Possible Cause Possible Solution
Control Panel
Forward and
Reverse buttons
do not work. 1. Machine not in "Mill/Drill Mode."
2. Shorted/disconnected wiring.
1. Rotate "Mill/Stop/Drill" switch to ”Mill" or "Drill" mode
( Page 26).
2. Inspect circuit boards, wiring connections. Replace/
repair as necessary.
Tool loose in
spindle. 1. Cutting tool not fully drawn up into spindle
taper.
2. Debris on cutting tool or in spindle taper.
3. Taking too big of cut.
1. Tighten drawbar (do not overtighten) ( Page 24).
2. Clean collet and spindle taper.
3. Lessen depth of cut and allow chips to clear.
Breaking tools or
cutters. 1. Spindle speed/feed rate too fast for depth
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.
1. Reduce spindle speed (
Page 25); 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.
Workpiece vibrates
or chatters during
operation. 1. Workpiece not secure.
2. Spindle speed/feed rate too fast.
3. Spindle extended too far down. 1. Properly clamp workpiece on table or in vise.
2. Reduce spindle speed (
Page 25); reduce feed rate.
3. Fully retract spindle and lower headstock. This
increases rigidity.
Table is hard to
move. 1. Table locks tightened down.
2. Chips loaded up on ways.
3. Ways are dry and need lubrication.
4. Table limit stops interfering.
5. Gibs too tight.
1. Release table locks ( Page 23).
2. Frequently clean away chips that load up during
milling operations.
3. Lubricate ways ( Page 35).
4. Adjust table limit stops out of the way (
Page 23).
5. Adjust gibs ( Page 40).
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.
1. Reduce spindle speed (
Page 25); 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 23).
Threads not
smooth. 1. Cutting edge chipped on cutting tool.
2. Cutting tool not centered.
3. Chip packing.
4. Galling.
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.
Cutting results not
square. 1. Spindle not exactly 90° to table.
2. Table travel inconsistent. 1. Tram spindle ( Page 42).
2. Adjust gibs (
Page 40).
Spindle speed
readout does not
display reading. 1. Shorted/disconnected wiring/plugs.
2. Sensor has gone bad.
3. Spacing between sensor and scale
incorrect
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.
Mill/Drill Operation