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Operation and Work Results
Symptom
Possible Cause
Entire machine
1. Workpiece is unbalanced.
vibrates exces-
sively upon
2. Worn or broken gear present.
startup and while
3. Chuck or faceplate has become unbalanced.
running.
4. Spindle bearings badly worn.
Cutting tool or
1. Tool holder not tight enough.
machine com-
2. Cutting tool sticks too far out of tool holder;
ponents vibrate
lack of support.
excessively dur-
3. Gibs are out of adjustment.
ing cutting.
4. Dull cutting tool.
5. Incorrect spindle speed or feed rate.
Can't remove
1. Quill had not retracted all the way back into the
tapered tool from
tailstock.
tailstock quill.
2. Debris was not removed from taper before
inserting into quill.
Cross slide, com-
1. Gibs are out of adjustment.
pound rest, or
2. Handwheel is loose.
carriage feed has
3. Lead screw mechanism worn or out of adjust-
sloppy operation.
ment.
Cross slide,
1. Gibs are loaded up with shavings, dust, or
compound rest,
grime.
or carriage feed
2. Gib screws are too tight.
handwheel is
hard to move.
3. Backlash setting too tight (cross slide only).
4. Bedways are dry.
Bad surface fin-
1. Wrong RPM or feed rate.
ish.
2. Dull tooling or poor tool selection.
3. Too much play in gibs.
4. Tool too high.
Inaccurate turn-
1. Headstock and tailstock are not properly
ing results from
aligned with each other.
one end of the
workpiece to the
other.
Chuck jaws won't
1. Chips lodged in the jaws.
move or don't
move easily.
Carriage won't
1. Gears are not all engaged.
feed.
2. Gears are broken.
3. Loose screw on the feed handle.
-44-
Troubleshooting
Possible Solution
1. Reinstall workpiece so it is as centered with the
spindle bore as possible.
2. Inspect gears and replace if necessary.
3. Rebalance chuck or faceplate; contact a local
machine shop for help.
4. Replace spindle bearings.
1. Check for debris, clean, and retighten.
2. Reinstall cutting tool so no more than 1/3 of the total
length is sticking out of tool holder.
3. Tighten gib screws at affected component.
4. Replace or re sharpen cutting tool.
5. Use the recommended spindle speed.
1. Turn the quill handwheel until it forces taper out of
quill.
2. Always make sure that taper surfaces are clean.
1. Tighten gib screw(s).
2. Tighten handwheel fasteners.
3. Tighten any loose fasteners on lead screw mecha-
nism.
1. Remove gibs, clean ways/dovetails, lubricate, and
readjust gibs.
2. Loosen
gib
screw(s)
bedways.
3. Slightly loosen backlash setting by loosening the
locking screw and adjusting the spanner ring at the
end of the handle.
4. Lubricate bedways and handles.
1. Adjust for appropriate RPM and feed rate.
2. Sharpen tooling or select a better tool for the intend-
ed operation.
3. Tighten gibs.
4. Lower the tool position.
1. Realign the tailstock to the headstock spindle bore
center line.
1. Remove jaws, clean and lubricate chuck threads,
and replace jaws.
1. Adjust gear positions.
2. Replace.
3. Tighten.
G0492 12" X 36" Combo Lathe/Mill
slightly,
and
lubricate
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