Mill Operation - Grizzly G0768 Owner's Manual

Mill Operation

Symptom Possible Cause
Tool slips in spindle. 1. Tool is not fully drawn up into spindle taper.
2. Debris on tool or in spindle taper.
3. Taking too big of cut.
Breaking tools or 1. Spindle speed/feed rate is too fast.
cutters.
2. Cutting tool too small.
3. Cutting tool getting too hot.
4. Taking too big of a cut.
5. Spindle extended too far down.
Workpiece vibrates 1. Workpiece not secure.
or chatters during
2. Spindle speed/feed rate is too fast.
operation.
3. Spindle extended too far down.
Cross slide table is 1. Chips have loaded up on ways.
hard to move.
2. Ways are dry and need lubrication.
3. Gibs are too tight.
Bad surface finish. 1. Spindle speed/feed rate is too fast.
2. Using dull or incorrect cutting tool.
3. Wrong rotation of cutting tool.
4. Workpiece not secure.
5. Spindle extended too far down.
-80-
Possible Solution
1. Tighten drawbar (Do not overtighten).
2. Clean collet and spindle taper.
3. Lessen depth of cut and allow chips to clear.
1. Set spindle speed correctly (Page 67) or use slower
feed rate.
2. Use larger cutting tool and slower feed rate.
3. Use coolant fluid or oil for appropriate application if
possible.
4. Lessen depth of cut and allow chips to clear.
5. Fully retract spindle and lower headstock. This
increases rigidity.
1. Properly clamp workpiece on table or in vise.
2. Set spindle speed correctly (Page 67) or use slower
feed rate.
3. Fully retract spindle and lower headstock. This
increases rigidity.
1. Frequently clean away chips that load up during
milling operations.
2. Lubricate ways (Page 73).
3. Adjust gibs (see Page 83
1. Set spindle speed correctly (Page 67) or use a
slower feed rate.
2. Sharpen cutting tool or select one that better suits
operation.
3. Check for proper cutting rotation for cutting tool.
4. Properly clamp workpiece on table or in vise.
5. Fully retract spindle and lower headstock. This
increases rigidity.
Model G0768/G0769 (Mfd. Since 8/15)
)
.