-66-
Model G0949G (Mfd. Since 01/22)
Symptom
Possible Cause
Possible Solution
Machine has
vibration or
noisy operation.
1. Motor or component loose.
2. Lathe Incorrectly mounted on stand.
3. V-belt(s) worn, loose, pulleys misaligned, or
belt slapping cover.
4. Pulley loose.
5. Motor mount loose/broken.
6. Spindle loose, improperly installed or
damaged.
7. Bit chattering.
8. Workpiece or chuck at fault.
9. Motor bearings at fault.
10. Gearbox at fault.
1. Replace damaged or missing bolts/nuts or tighten if
loose.
2. Adjust feet, shim, or tighten mounting hardware.
3. Inspect/replace belt with a new belt (
Page 72). Re-
align pulleys if necessary.
4. Secure pulley on shaft.
5. Tighten/replace.
6. Tighten loose spindle, re-install spindle ensuring
mating surfaces are clean, replace spindle if damaged.
7. Replace/sharpen bit; index bit to workpiece; use
correct feed rate and cutting RPM.
8. Center workpiece in chuck or face plate; replace
defective chuck.
9. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
10. Rebuild gearbox for bad gear(s)/bearing(s).
Entire machine
vibrates upon
startup and
while running.
1. Workpiece unbalanced.
2. Workpiece hitting stationary object.
3. Loose or damaged V-belt(s).
4. V-belt pulleys not properly aligned.
5. Worn/broken gear or bad bearing.
6. Spindle bearings at fault.
1. Re-install workpiece as centered with spindle bore as
possible.
2. Stop lathe immediately and correct interference
problem.
3. Re-tension/replace V-belt(s) as necessary (
Page 72).
4. Align V-belt pulleys.
5. Replace broken gear or bearing.
6. Reset spindle bearing preload or replace spindle
bearings.
Bad surface
finish.
1. Incorrect spindle speed or feed rate.
2. Dull tooling or wrong tool selection.
3. Workpiece deflecting.
4. Excessive play in gibs.
5. Material building up on cutting tool.
6. Bearing preload needs to be adjusted.
7. Belts bad.
8. Spindle bearings at fault.
9. Tool height not at center line.
1. Use correct spindle speed and feed rate.
2. Sharpen tooling; use correct tool for operation.
3. Change setup to properly support workpiece.
4. Tighten gibs (
Page 69).
5. Use coolant on tool and workpiece during operation.
6. Adjust bearing preload (
Page 75).
7. Replace belts (
Page 72).
8. Replace spindle bearings.
9. Adjust tool height to center line.
Tapered tool
difficult to
remove from
tailstock quill.
1. Quill not fully retracted into tailstock.
1. Rotate quill handwheel until it forces tapered tool out
of quill.
Tapered tool
will not lock in
quill.
1. Debris not removed from tool taper before
inserting into quill.
1. Remove debris from tapered tool before re-inserting
into quill.
Cross slide,
compound rest,
or carriage feed
has sloppy
operation.
1. Gibs are out of adjustment.
2. Handwheel loose or has excessive backlash.
3. Leadscrew mechanism worn or out of
adjustment.
1. Adjust gibs (
Page 69).
2. Tighten handwheel fasteners or adjust handwheel
backlash to a minimum (
Page 68).
3. Adjust leadscrew to remove end play (
Page 71).
Chuck jaws
will not move
or do not move
easily.
1. Chips lodged in jaws or scroll plate.
2. Dent/ridge in jaw slot of chuck body.
1. Remove jaws, clean and lubricate scroll plate, then
re-install jaws.
2. Stone or file off high spot in jaw slots.
Lathe Operation
Summary of Contents for G0949G
Page 108: ......
