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Symptom
Possible Cause
Entire machine
1. Workpiece is unbalanced.
vibrates upon
startup and while
2. Workpiece is hitting stationary object.
running.
3. Loose or damaged V-belt(s).
4. V-belt pulleys not properly aligned.
5. Chuck or faceplate is unbalanced.
6. Gears not aligned in headstock or no
backlash.
7. Worn/broken gear or bad bearing.
8. Spindle bearings at fault.
Bad surface finish.
1. Incorrect spindle speed or feed rate.
2. Dull tooling or wrong tool selection.
3. Workpiece is flexing.
4. Excessive play in gibs.
5. Bearing preload needs to be adjusted.
6. Belts are bad.
7. Spindle bearings are bad.
Tapered tool
1. Quill not fully retracted into tailstock.
difficult to remove
from tailstock quill.
2. Debris not removed from tool taper before
inserting into quill.
Cross slide,
1. Gibs are out of adjustment.
compound rest, or
2. Handwheel has excessive backlash.
carriage feed has
sloppy operation.
3. Leadscrew mechanism is worn or out of
adjustment.
Cross slide,
1. Bedways are dry and in need of lubricant.
compound,
2. Ways are loaded with shavings, dust, or
or carriage
grime.
handwheels hard to
3. Gibs are too tight.
move.
4. Backlash setting is too tight.
Cutting tool
1. Tool holder is not tight enough.
or machine
2. Cutting tool sticks too far out of tool holder;
components vibrate
lacks support.
excessively during
3. Workpiece is deflecting.
cutting.
4. Workpiece is unbalanced.
5. Gibs are out of adjustment.
6. Cutting tool is dull.
7. Spindle speed or feed rate is incorrect.
-72-
Possible Solution
1. Re-install workpiece as centered with the spindle
bore as possible.
2. Stop lathe immediately and correct interference
problem.
3. Re-tension/replace the V-belt(s) as necessary
(Page 79).
4. Align the V-belt pulleys.
5. Rebalance chuck or faceplate; contact a local
machine shop for help.
6. Adjust change gears and establish backlash
(Page 50).
7. Replace broken gear or bearing.
8. Reset spindle bearing preload (Page 80) or replace
worn spindle bearings.
1. Use correct spindle speed (Page 45) and feed rate
(Page 47).
2. Sharpen tooling; use correct tool for operation.
3. Change setup to properly support workpiece.
4. Tighten gibs (Page 75).
5. Adjust bearing preload (Page 80).
6. Replace belts (Page 79).
7. Change spindle bearings.
1. Rotate quill handwheel until it forces tapered tool out
of quill.
2. Remove quill from tailstock and drive tool out with a
punch. Carefully deburr bore of quill.
1. Adjust gibs (Page 75).
2. Tighten handwheel fasteners or adjust handwheel
backlash to a minimum (Page 74).
3. Adjust leadscrew to remove end play.
1. Lubricate bedways/ball oilers (Page 67).
2. Remove gibs, clean ways, lubricate, re-install, and
re-adjust.
3. Loosen gibs slightly (Page 75), and lubricate
bedways.
4. Slightly loosen backlash setting (Page 74).
1. Tighten tool holder.
2. Re-install cutting tool so no more than
length is sticking out of tool holder.
3. Use steady or follow rest (Page 40).
4. Balance workpiece.
5. Adjust gibs (Page 75).
6. Replace or resharpen cutting tool.
7. Use recommended spindle speed (Page 45) and
feed rate (Page 47).
Model G0782 (Mfd. Since 10/15)
⁄
of total
1
3
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