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Model G0765 (Mfd. Since 5/15)
-53-
Lathe Operation
Symptom Possible Cause Possible Solution
Bad surface finish. 1. Wrong spindle speed or feed rate.
2. Dull tooling or wrong tool selection.
3. Tool height not at spindle centerline.
4. Too much play in gibs.
1. Adjust for appropriate spindle speed and feed rate.
2. Sharpen tooling or select a better tool for the
intended operation.
3. Adjust tool height to spindle centerline (see Page
38).
4. Tighten gibs (see Page 57).
Tapered tool difficult
to remove from
tailstock quill.
1. Quill not fully retracted into tailstock.
2. Contaminants not removed from taper
before inserting into quill.
1. Turn quill handwheel until tapered tool is forced out
of quill.
2. Clean taper and bore, then re-install tool.
Cross slide,
compound rest, or
carriage feed has
sloppy operation.
1. Ways loaded with shavings, dust, or grime.
2. Gibs are out of adjustment.
3. Handwheel loose or excessive backlash.
4. Leadscrew mechanism worn or out of
adjustment.
1. Clean ways and relubricate.
2. Adjust gibs (see Page 57).
3. Tighten handwheel fasteners, adjust handwheel
backlash to a minimum (see Page 56).
4. Adjust leadscrew to remove end play (see Page
56).
Cross slide,
compound,
or carriage
handwheels hard to
move.
1. Ways loaded with chips, dust, or grime.
2. Gibs are too tight.
3. Backlash setting too tight.
4. Bedways are dry.
5. Half nut lever engaged.
1. Clean ways and lubricate.
2. Loosen gibs slightly (see Page 57).
3. Slightly loosen backlash setting (see Page 56).
4. Lubricate bedways.
5. Disengage half nut lever for manual feeding.
Cutting tool
or machine
components vibrate
excessively during
cutting.
1. Tool holder not tight enough.
2. Cutting tool sticks too far out of tool holder;
lack of support.
3. Gibs are out of adjustment.
4. Dull cutting tool.
5. Incorrect spindle speed or feed rate.
1. Check for debris, clean, and retighten.
2. Re-install cutting tool so no more than
1
⁄3 of the total
length is sticking out of tool holder.
3. Adjust gibs at affected component (see Page 57).
4. Replace or resharpen cutting tool.
5. Use the recommended spindle speed and feed rate.
Workpiece is
tapered.
1. Headstock and tailstock not properly
aligned.
1. Re-align tailstock to headstock spindle centerline
(see Page 32).
Chuck jaws will
not move or do not
move easily.
1. Chips lodged in jaws or scroll plate. 1. Remove jaws, clean and lubricate scroll plate, then
replace jaws.