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Model G0750GV (Mfd. Since 03/18)
-67-
Lathe Operation
Symptom
Possible Cause
Possible Solution
Entire machine
vibrates upon
startup and while
running.
1. Workpiece is unbalanced.
2. Loose or damaged V-belt(s).
3. V-belt pulleys are not properly aligned.
4. Worn or broken gear present.
5. Chuck or faceplate is unbalanced.
6. Gears not aligned in headstock or no
backlash.
7. Broken gear or bad bearing.
8. Workpiece is hitting stationary object.
9. Spindle bearings at fault.
1. Re-install workpiece as centered with the spindle
bore as possible.
2. Re-tension/replace the V-belt(s) as necessary
(
Page 73).
3. Align V-belt pulleys.
4. Inspect gears, and replace if necessary (
Page 49).
5. Re-balance chuck or faceplate; contact a local
machine shop for help.
6. Adjust change gears and establish backlash
(
Page 47).
7. Replace broken gear or bearing.
8. Stop lathe immediately and correct interference
problem.
9. Reset spindle bearing preload or replace worn
spindle bearings (
Page 77).
Bad surface finish.
1. Wrong spindle speed or feed rate.
2. Dull tooling or poor tool selection.
3. Tool height not at spindle centerline.
4. Too much play in gibs.
1. Adjust for appropriate spindle speed and feed rate
(
Page 46).
2. Sharpen tooling or select a better tool for the
intended operation.
3. Adjust tool height to spindle centerline (
Page 44).
4. Tighten gibs (
Page 70).
Tapered tool difficult
to remove from
tailstock quill.
1. Quill is not retracted all the way back into
the tailstock.
2. Contaminants not removed from taper
before inserting into quill.
1. Turn the quill handwheel until it forces the tapered
tool out of quill.
2. Clean the taper and bore, then re-install tool.
Cross slide,
compound rest, or
carriage feed has
sloppy operation.
1. Gibs are out of adjustment.
2. Handwheel is loose or backlash is high.
3. Leadscrew mechanism worn or out of
adjustment.
1. Adjust gibs (
Page 70).
2. Tighten handwheel fasteners, adjust handwheel
backlash to a minimum (
Page 69).
3. Adjust leadscrew to remove end play (
Page 70).
Motor & Electrical (Cont.)
Symptom
Possible Cause
Possible Solution
Machine has
vibration or noisy
operation.
1. Motor or component loose.
2. Bit chattering.
3. V-belt(s) worn or loose.
4. Motor fan rubbing on fan cover.
5. Motor mount loose/broken.
6. Pulley loose.
7 Machine incorrectly mounted.
8. Motor bearings at fault.
9. Workpiece or chuck at fault.
1. Inspect/replace damaged bolts/nuts, and retighten
with thread locking fluid.
2. Replace/sharpen bit; index bit to workpiece; use
correct feed rate and cutting RPM; retract tool
holder and position workpiece closer.
3. Inspect/replace belts with a new matched set
(
Page 73).
4. Fix/replace fan cover; replace loose/damaged fan.
5. Tighten/replace.
6. Re-align/replace shaft, pulley set screw, and key.
7. Tighten mounting bolts; relocate/shim machine.
8. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
9. Center workpiece; replace defective chuck.
Summary of Contents for G0750GV
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