1. Workpiece is unbalanced.
startup and while
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
7. Broken gear or bad bearing.
8. Workpiece is hitting stationary object.
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 spindle centerline.
4. too much play in gibs.
tapered tool difficult
1. Quill is not retracted all the way back into
to remove from
2. Contaminants not removed from taper
before inserting into quill.
1. gibs are out of adjustment.
compound rest, or
2. handwheel is loose or backlash is high.
carriage feed has
3. leadscrew mechanism worn or out of
1. dovetail ways loaded with shavings, dust,
2. gibs are too tight.
handwheels hard to
3. Backlash setting too tight.
4. Bedways are dry.
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. re-install workpiece as centered with the spindle
bore as possible.
2. re-tension/replace the V-belt(s) as necessary (see
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.
7. replace broken gear or bearing.
8. stop lathe immediately and correct interference
9. reset spindle bearing preload or replace worn
1. adjust for appropriate spindle speed and feed rate.
2. sharpen tooling or select a better tool for the
3. adjust tool height to spindle centerline (see page
4. tighten gibs (see page 79).
1. turn the quill handwheel until it forces the tapered
tool out of quill.
2. Clean the taper and bore, then re-install tool.
1. adjust gibs (see page 79).
2. tighten handwheel fasteners, adjust handwheel
backlash to a minimum (see page 78).
3. adjust leadscrew to remove end play (see page
1. remove gibs, clean ways, lubricate, and re-adjust
2. loosen gibs slightly (see page 79), and lubricate
3. slightly loosen backlash setting (see page 78).
4. lubricate bedways/ball oilers.
1. Check for debris, clean, and re-tighten.
2. re-install cutting tool so no more than
length is sticking out of tool holder.
3. adjust gibs at affected component (see page 79).
4. replace or resharpen cutting tool.
5. Use the recommended spindle speed and feed rate.
Model G0746/G0749 (Mfg. Since 3/13)
of the total