Model G0776 (Mfd. Since 7/14)
-75-
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 (see
Page 83).
3. Align the V-belt pulleys.
4. Inspect gears, and replace if necessary.
5. Re-balance chuck or faceplate; contact a local
machine shop for help.
6. Adjust change gears and establish backlash (see
Page 53).
7. Replace broken gear or bearing.
8. Stop lathe immediately and correct interference
problem.
9. Reset spindle bearing preload (Page 84) or replace
worn spindle bearings.
Bad surface finish. 1. Spindle speed or feed rate is wrong.
2. Dull tooling or wrong tool selection.
3. Tool height is not at spindle centerline.
4. Too much play in gibs.
5. Spindle bearings are bad.
6. Bearing preload needs to be adjusted.
7. Belts are bad.
8. Workpiece is flexing.
1. Adjust for appropriate spindle speed (see Page 48)
and feed rate (see Page 51).
2. Sharpen tooling or select a better tool for intended
operation.
3. Adjust tool holder so tool is even with spindle
centerline (Page 46).
4. Tighten gibs (see Page 78).
5. Change spindle bearings.
6. Adjust bearing preload (see Page 84).
7. Replace belts (see Page 83).
8. Change setup to properly support workpiece.
Tapered tool
difficult to remove
from tailstock quill.
1. Quill is not retracted all the way back into
tailstock.
2. Debris not removed from tool taper before
inserting into quill.
1. Turn 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 is loose or too much backlash.
3. Leadscrew mechanism is worn or out of
adjustment.
1. Adjust gibs (see Page 78).
2. Tighten handwheel fasteners or adjust handwheel
backlash to a minimum (see Page 77).
3. Adjust leadscrew to remove end play.
Cross slide,
compound,
or carriage
handwheels hard to
move.
1. Ways are loaded with shavings, dust, or
grime.
2. Gibs are too tight.
3. Backlash setting is too tight.
4. Bedways are dry and in need of lubricant.
1. Remove gibs, clean ways, lubricate, and re-adjust
gibs.
2. Loosen gibs slightly (see Page 78), and lubricate
bedways.
3. Slightly loosen backlash setting (see Page 77).
4. Lubricate bedways/ball oilers (see Page 70).
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