-72-
Model G0782 (Mfd. Since 10/15)
Symptom
Possible Cause
Possible Solution
Entire machine
vibrates upon
startup and while
running.
1. Workpiece is unbalanced.
2. Workpiece is hitting stationary object.
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.
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.
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.
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.
Tapered tool
difficult to remove
from tailstock quill.
1. Quill not fully retracted into tailstock.
2. Debris not removed from tool taper before
inserting into quill.
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.
Cross slide,
compound rest, or
carriage feed has
sloppy operation.
1. Gibs are out of adjustment.
2. Handwheel has excessive backlash.
3. Leadscrew mechanism is worn or out of
adjustment.
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.
Cross slide,
compound,
or carriage
handwheels hard to
move.
1. Bedways are dry and in need of lubricant.
2. Ways are loaded with shavings, dust, or
grime.
3. Gibs are too tight.
4. Backlash setting is too tight.
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).
Cutting tool
or machine
components vibrate
excessively during
cutting.
1. Tool holder is not tight enough.
2. Cutting tool sticks too far out of tool holder;
lacks support.
3. Workpiece is deflecting.
4. Workpiece is unbalanced.
5. Gibs are out of adjustment.
6. Cutting tool is dull.
7. Spindle speed or feed rate is incorrect.
1. Tighten tool holder.
2. Re-install cutting tool so no more than
1
⁄
3
of total
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).
Summary of Contents for G0782
Page 116: ......
