Grizzly G0750G User Manual

Model G0750G (Mfg. Since 11/12)
-69-
Lathe Operation
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 75).
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
problem.
9. Reset spindle bearing preload or replace worn
spindle bearings.
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.
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
45).
4. Tighten gibs (see Page 72).
Tapered tool difficult
to remove from
tailstock quill.
1. Quill is not retracted all the way back into
the tailstock.
2. Contaminants not removed from taper
before inserting into quill.
1. Turn the quill handwheel until it forces the tapered
tool out of quill.
2. Clean the taper and bore, then re-install tool.
Cross slide,
compound rest, or
carriage feed has
sloppy operation.
1. Gibs are out of adjustment.
2. Handwheel is loose or backlash is high.
3. Leadscrew mechanism worn or out of
adjustment.
1. Adjust gibs (see Page 72).
2. Tighten handwheel fasteners, adjust handwheel
backlash to a minimum (see Page 71).
3. Adjust leadscrew to remove end play (see Page
72).
Cross slide,
compound,
or carriage
handwheels hard to
move.
1. Dovetail ways loaded with shavings, dust,
or grime.
2. Gib screws are too tight.
3. Backlash setting too tight.
4. Bedways are dry.
1. Remove gibs, clean ways, lubricate, and re-adjust
gibs.
2. Loosen gib screw(s) slightly (see Page 72), and
lubricate bedways.
3. Slightly loosen backlash setting (see Page 71).
4. Lubricate bedways/ball oilers.
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 re-tighten.
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 72).
4. Replace or resharpen cutting tool.
5. Use the recommended spindle speed and feed rate.

Grizzly G0750G Specifications

General

Brand	Grizzly
Model	G0750G
Category	Lathe
Language	English