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For Machines Mfg. Since 5/11
Symptom
Entire machine
1. Workpiece is unbalanced.
vibrates upon
startup and while
2. Loose or damaged V-belt(s).
running.
3. V-belt pulleys are not properly
4. Worn or broken gear present.
5. Chuck or faceplate is unbalanced.
6. Gears not aligned in headstock or
7. Broken gear or bad bearing.
8. Workpiece is hitting stationary
9. Spindle bearings at fault.
Bad surface finish.
1. Wrong spindle speed or feed rate.
2. Dull tooling or poor tool selection.
3. Tool height not at centerline.
4. Too much play in gibs.
Tapered tool
1. Quill is not retracted all the way
difficult to remove
from tailstock quill.
2. Contaminants not removed from
Cross slide,
1. Gibs are out of adjustment.
compound, or
2. Handwheel is loose or backlash is
carriage feed has
sloppy operation.
3. Leadscrew mechanism worn or out
Cross slide,
1. Dovetail slides loaded with
compound, or
carriage feed
2. Gib screws are too tight.
handwheel is hard
to move.
3. Backlash setting too tight (cross
4. Bedways are dry.
Cutting tool
1. Tool holder not tight enough.
or machine
2. Cutting tool sticks too far out of tool
components vibrate
excessively during
3. Gibs are out of adjustment.
cutting.
4. Dull cutting tool.
5. Incorrect spindle speed or feed rate.
TROU B LESHOOTI NG
Possible Cause
aligned.
no backlash.
object.
back into the tailstock.
taper before inserting into quill.
high.
of adjustment.
shavings, dust, or grime.
slide only).
holder; lack of support.
13" Heavy 13
Possible Solution
1. Re-install workpiece as centered with the spindle
bore as possible.
2. Re-tension/replace the V-belt(s) as necessary (see
Page 77).
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 gears and establish backlash.
7. Replace broken gear or bearing.
8. Stop lathe immediately and correct interference
problem.
9. Reset spindle bearing preload or replace worn
spindle bearings.
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 centerline (see Page 47).
4. Tighten gibs (see Page 75).
1. Turn the quill handwheel until it forces the tapered
tool out of quill.
2. Clean the taper and bore and re-install tapered tool.
1. Adjust gib screw(s) (see Page 75).
2. Tighten handwheel fasteners, adjust handwheel
backlash to a minimum (see Page 74).
3. Adjust leadscrew to remove end play (see Page 75).
1. Remove gibs, clean ways/dovetails, lubricate, and
re-adjust gibs.
2. Loosen gib screw(s) slightly, and lubricate bedways
(see Page 75).
3. Slightly loosen backlash setting (see Page 75).
4. Lubricate bedways and handles.
1. Check for debris, clean, and retighten.
2. Re-install cutting tool so no more than
length is sticking out of tool holder.
3. Adjust gib screws at affected component (see Page
75)
4. Replace or resharpen cutting tool.
5. Use the recommended spindle speed.
Gearhead Lathe
®
⁄
of the total
1
3
-85-
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