Grizzly G4003G owner manual Operation and Work Results

Troubleshooting

Operation and Work Results

Symptom	Possible Cause		Possible Solution
Entire machine	1.	Workpiece is unbalanced.	1.	Reinstall workpiece so it is as centered with the
vibrates exces-				spindle bore as possible.
sively upon	2.	Worn or broken gear present.	2.	Inspect gears and replace if necessary.
startup and while	3.	Chuck or faceplate has become unbalanced.	3.	Rebalance chuck or faceplate; contact a local
running.				machine shop for help.
	4.	Spindle bearings at fault.	4.	Tighten or replace spindle bearings.
Cutting tool or	1.	Tool holder not tight enough.	1.	Check for debris, clean, and retighten.
machine com-	2.	Cutting tool sticks too far out of tool holder;	2.	Reinstall cutting tool so no more than 1⁄3 of the total
ponents vibrate		lack of support.		length is sticking out of tool holder.
excessively dur-	3.	Gibs are out of adjustment.	3.	Tighten gib screws at affected component.
ing cutting.	4.	Dull cutting tool.	4.	Replace or re sharpen cutting tool.
	5.	Incorrect spindle speed or feed rate.	5.	Use the recommended spindle speed.
Can't remove	1. Quill had not retracted all the way back into the		1.	Turn the quill handwheel until it forces taper out of
tapered tool from		tailstock.		quill.
tailstock quill.	2.	Debris was not removed from taper before	2.	Always make sure that taper surfaces are clean.
		inserting into quill.
Cross slide, com-	1.	Gibs are out of adjustment.	1.	Tighten gib screw(s).
pound rest, or	2.	Handwheel is loose.	2.	Tighten handwheel fasteners.
carriage feed has	3.	Lead screw mechanism worn or out of adjust-	3.	Tighten any loose fasteners on lead screw mecha-
sloppy operation.		ment.		nism.
Cross slide,	1.	Gibs are loaded up with shavings or grime.	1.	Remove gibs, clean ways/dovetails, lubricate, and
compound rest,				readjust gibs.
or carriage feed	2.	Gib screws are too tight.	2.	Loosen gib screw(s) slightly, and lubricate
handwheel is				bedways.
hard to move.	3.	Backlash setting too tight (cross slide only).	3.	Slightly loosen backlash setting by loosening the
				locking screw and adjusting the spanner ring at the
				end of the handle.
	4.	Bedways are dry.	4.	Lubricate bedways and handles.
Bad surface fin-	1.	Wrong RPM or feed rate.	1.	Adjust for appropriate RPM and feed rate.
ish.	2.	Dull tooling or poor tool selection.	2.	Sharpen tooling or select a better tool for the intend-
				ed operation.
	3.	Too much play in gibs.	3. Tighten gibs.
	4.	Tool too high.	4.	Lower the tool position.
Inaccurate turn-	1.	Headstock and tailstock are not properly	1.	Realign the tailstock to the headstock spindle bore
ing results from		aligned with each other.		center line.
one end of the
workpiece to the
other.
Chuck jaws won't	1.	Chips lodged in the jaws.	1.	Remove jaws, clean and lubricate chuck threads,
move or don't				and replace jaws.
move easily.
Carriage won't	1.	Gears are not all engaged or broken.	1.	Adjust gear positions or replace.
feed, or hard to	2.	Gibs are too tight.	2.	Loosen gib screw(s) slightly.
move.	3.	Loose screw on the feed handle.	3.	Tighten.
	4.	Lead screw shear pin has sheared.	4. Correct for cause of shear pin breakage, and replace
				shear pin.
Tailstock quill will	1.	Quill lock lever is tightened down.	1.	Turn lever counterclockwise.
not feed out of
tailstock.
-36-				G4003G Gunsmith's Lathe