Grizzly G0776 Owner's Manual page 78

Symptom Possible Cause
Cutting tool 1. Tool holder is not tight enough.
or machine 2. Cutting tool sticks too far out of tool holder;
components vibrate lack of support.
excessively during 3. Gibs are out of adjustment.
cutting. 4. Cutting tool is dull.
5. Spindle speed or feed rate is wrong.
6. Workpiece is deflecting.
7. Workpiece is unbalanced.
Workpiece is 1. Spindle and tailstock are not properly
tapered. aligned with each other.
2. Lathe bed is twisted.
Chuck jaws will 1. Chips are lodged in jaws or scroll plate.
not move or do not
move easily. 2. Dent/ridge is in jaw slot of chuck body.
Spindle lacks 1. Belts are slipping.
turning power or
starts up slowly.
Gear change dials 1. Gears not aligned inside headstock/quick-
will not shift into change gearbox.
position.
Workpiece slips in 1. Chuck jaws do not match workpiece
chuck.
diameter.
2. Cutting force is too high.
3. Speed is too high.
4. Jaws are worn.
Carriage will not 1. Gears are not all engaged.
feed or is hard to 2. Half nut lever is engaged.
move. 3. Screw is loose on feed handle.
4. Carriage lock is tightened down.
5. Chips have loaded up on ways.
6. Ways are dry and in need of lubrication.
7. Gibs are too tight.
8. Gears or shear pin is broken.
9. Feed clutch is slipping.
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Possible Solution
1. Tighten tool holder.
2. Re-install cutting tool so no more than
length is sticking out of tool holder.
3. Adjust gibs (see Page 78).
4. Replace or resharpen cutting tool.
5. Use recommended spindle speed (see Page 48)
and feed rate (see Page 51).
6. Change chucking length or diameter. Use support on
tailstock end.
7. Balance workpiece.
1. Re-align the tailstock to the headstock spindle
centerline (see Page 39).
2. Level lathe (see Page 23).
1. Remove jaws, clean and lubricate scroll plate, then
replace jaws.
2. Stone or file off high spot in jaw slots.
1. Tighten/adjust belts (see Page 83).
1. Rotate spindle by hand with light pressure on the
dial until gear falls into place.
1. Reposition or mold workpiece so that diameter
matches chuck jaw dimensions.
2. Reduce cutting force.
3. Reduce spindle speed (see Page 48).
4. Replace jaws or chuck.
1. Engage gears using gear dials.
2. Disengage half nut lever.
3. Tighten.
4. Check to make sure carriage lock is fully released.
5. Frequently clean away chips that load up during
turning operations.
6. Lubricate bedways/ball oilers.
7. Loosen gib screw(s) slightly (see Page 78).
8. Replace gears or shear pin (see Page 80).
9. Increase clutch spring pressure (see Page 82).
Model G0776 (Mfd. Since 7/14)
⁄ of total
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3