Lathe Operation - Grizzly G4003G Owner's Manual

Lathe Operation

Symptom Possible Cause
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 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.
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 the tailstock.
tailstock quill. 2. Contaminants not removed from taper
before inserting into quill.
Cross slide, 1. Gibs are out of adjustment.
compound rest, or 2. Handwheel is loose or backlash is high.
carriage feed has
sloppy operation. 3. Leadscrew mechanism worn.
Cross slide, 1. Dovetail ways loaded with shavings, dust,
compound, or grime.
or carriage 2. Gib screws are too tight.
handwheels hard to
move. 3. Backlash setting too tight.
4. Bedways are dry.
Cutting tool 1. Tool holder not tight enough.
or machine 2. Cutting tool sticks too far out of tool holder;
components vibrate lack of support.
excessively during 3. Gibs are out of adjustment.
cutting. 4. Dull cutting tool.
5. Incorrect spindle speed or feed rate.
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Possible Solution
1. Re-install workpiece as centered with the spindle
bore as possible.
2. Retension/replace the V-belt(s) as necessary (see
Page 73).
3. Align the V-belt pulleys.
4. Inspect gears, and replace if necessary.
5. Rebalance 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 (Page 75) 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 spindle centerline (see Page
37).
4. Tighten gibs (see Page 71).
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 71).
2. Tighten handwheel fasteners, adjust hanhdwheel
backlash to a minimum (see Page 70).
3. Replace leadscrew mechanism.
1. Remove gibs, clean ways, lubricate, and re-adjust
gibs.
2. Loosen gib screw(s) slightly (see Page 71), and
lubricate bedways.
3. Slightly loosen backlash setting (see Page 70).
4. Lubricate bedways/ball oilers (Page 63).
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 gibs (see Page 71).
4. Replace or resharpen cutting tool.
5. Use the recommended spindle speed and feed rate.
Model G4003G (Mfd. Since 1/15)
1 ⁄ of the total
3