Operation - Grizzly G0726 Owner's Manual

Operation

Symptom Possible Cause
Tool slips in collet. 1. Collet is not fully drawn into spindle taper.
2. Wrong size collet.
3. Debris on collet or spindle mating surface.
4. Excessive depth of cut.
Breaking tooling. 1. Spindle speed/feed rate too fast.
2. Tooling getting too hot.
3. Excessive depth of cut.
Machine is loud 1. Excessive depth of cut.
when cutting;
2. Dull tooling.
overheats or bogs
3. Feed rate too fast.
down in the cut.
Workpiece vibrates 1. Locks not tight.
or chatters during
operation.
2. Workpiece not securely clamped to table or
mill vise.
3. Tooling not secure or is damaged.
4. Spindle speed/feed rate too fast.
5. Gibs are too loose.
Table hard to move. 1. Locks are tightened down.
2. Chips have loaded up on the ways.
3. Ways are dry and in need of lubrication.
4. Gibs are too tight.
Bad surface finish. 1. Wrong spindle speed/feed rate.
2. Dull/damaged tooling; wrong tooling for
operation.
3. Wrong spindle rotation for tooling.
4. Workpiece not securely clamped to table or
mill vise.
5. Gibs are too loose.
X- or Y-axis power 1. Bevel gear is loose.
feed chatters or
2. Power feed unit is at fault.
grinds on operation.
Z-axis power feed 1. Z-axis crank engaged, tripping safety
does not work.
switch.
2. Safety switch/motor at fault.
Knees moves in 1. Machine is wired out of phase.
opposite direction
of button selected.
Model G0726 (Mfg. Since 7/11)
Possible Solution
1. Snug up drawbar.
2. Use correct collet for shank diameter.
3. Remove oil and debris from collet and spindle
mating surfaces, then re-install.
4. Decrease depth of cut and allow chips to clear.
1. Use correct spindle RPM and feed rate.
2. Use coolant; reduce spindle RPM/feed rate.
3. Decrease depth of cut and allow chips to clear.
1. Decrease depth of cut and allow chips to clear.
2. Use sharp tooling.
3. Decrease feed rate.
1. Tighten all locks on mill that are not associated with
movement for the operation.
2. Check that clamping is tight and sufficient for the
operation; make sure mill vise is tight to table.
3. Secure tooling; replace if damaged.
4. Use correct spindle RPM and feed rate.
5. Properly adjust gibs (see Page 52).
1. Fully loosen locks needed for movement.
2. Frequently clean away chips that load up during
operations.
3. Lubricate ways (see Page 46).
4. Properly adjust gibs (see Page 52).
1. Use correct spindle RPM and feed rate.
2. Sharpen/replace tooling; use correct tooling for
operation.
3. Check for proper spindle rotation for tooling.
4. Check that clamping is tight and sufficient for the
operation; make sure mill vise is tight to table.
5. Properly adjust gibs (see Page 52).
1. Tighten ball handle hex nut.
2. Replace.
1. Disengage Z-axis crank.
2. Test/repair/replace.
1. Swap any two of the three incoming power wires
that connect to the machine (Page 22).
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