Grizzly G0844 Owner's Manual page 35

Wood Lathe Operation
Symptom Possible Cause
Bad surface finish. 1. Dull tooling or wrong tool used for task.
2. Tool height is not
centerline.
3. Spindle speed is wrong.
4. Excessive vibration.
Excessive vibration 1. Workpiece is mounted incorrectly.
upon startup
(when workpiece is
2. Workpiece warped, out of round, or flawed.
installed).
3. Lathe is resting on an uneven surface.
4. Spindle speed too fast for workpiece.
5. Workpiece hitting stationary object.
6. Tailstock or tool rest not securely clamped
to lathe bed.
7. Belt pulleys are not properly aligned.
8. Motor mount bolts are loose.
9. Belt is worn or damaged.
10. Spindle bearings are worn or damaged.
Chisel grabs or digs 1. Wrong chisel/tool being used.
into workpiece.
2. Chisel/tool too dull.
3. Tool rest height not set correctly.
4. Tool rest is set too far from workpiece.
Tailstock moves 1. Tailstock mounting bolt/hex nut is loose.
under load.
2. Bed or clamping surface is excessively oily
or greasy.
Spindle lacks 1. Belt is slipping.
turning power or
2. Pulleys loose.
starts up slowly.
3. Workpiece too heavy for spindle.
Quill will not move 1. Keyway is not aligned with quill lock lever.
forward when
handwheel is turned
DRO doesn't give 1. Shorted/disconnected wiring/plugs.
reading; reading
incorrect.
2. Variable-speed potentiometer at fault.
3. DRO speed sensor at fault.
4. Circuit board at fault.
Model G0844 (Mfd. Since 2/18)
⁄ " above spindle
1
8
Possible Solution
1. Sharpen tooling, select correct tool for operation.
2. Adjust tool rest so tool is
centerline.
3. Adjust for appropriate spindle speed (Page 23).
4. Troubleshoot possible causes/solutions in this table.
1. Remount workpiece, making sure that centers are
embedded in true center of workpiece.
2. Cut workpiece to be concentric, or use a different
workpiece.
3. Adjust feet to eliminate wobble.
4. Reduce spindle speed (Page 23).
5. Stop lathe and fix interference problem.
6. Check lock levers and tighten if necessary (Pages
18–19).
7. Align belt pulleys (Page 35).
8. Tighten motor mount bolts.
9. Replace belt (Page 34).
10. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
1. Use correct chisel/tool.
2. Sharpen or replace chisel/tool.
3. Correct tool rest height (Page 19).
4. Move tool rest closer to workpiece.
1. Tighten mounting bolt/hex nut.
2. Clean bed or clamping surface to remove excess
oil/grease.
1. Tighten/adjust belt (Page 34).
2. Tighten pulley set screw; re-align/replace shaft,
pulley set screw, and key.
3. Remove excess material before remounting; use
lighter workpiece.
1. Align quill keyway and quill lock lever and slightly
tighten lever to engage keyway.
1. Inspect wiring connections on circuit boards,
sensors, and plugs. Replace/repair as necessary.
2. Test/replace if at fault.
3. Test/replace if at fault.
4. Inspect/replace if at fault.
⁄ " above spindle
1
8
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