Grizzly G0740 owner manual Lathe Operation, Symptom Possible Cause Possible Solution

Lathe Operation

Symptom	Possible Cause		Possible Solution
Entire machine	1.	Workpiece is unbalanced.	1.	re-install workpiece as centered with the spindle
vibrates upon				bore as possible.
startup and while	2.	loose or damaged V-belt(s).	2.	re-tension/replace the V-belt(s) as necessary (see
running.				Page 79).
	3.	V-belt pulleys are not properly aligned.	3.	align the V-belt pulleys.
	4.	Worn or broken gear present.	4.	inspect gears, and replace if necessary.
	5.	Chuck or faceplate is unbalanced.	5.	re-balance chuck or faceplate; contact a local
				machine shop for help.
	6.	gears not aligned in headstock or no	6.	adjust change gears and establish backlash.
		backlash.
	7.	broken gear or bad bearing.	7.	replace broken gear or bearing.
	8.	Workpiece is hitting stationary object.	8.	stop lathe immediately and correct interference
				problem.
	9.	spindle bearings at fault.	9.	reset spindle bearing preload or replace worn
				spindle bearings.
Bad surface finish.	1.	Wrong spindle speed or feed rate.	1.	adjust for appropriate spindle speed and feed rate.
	2.	Dull tooling or poor tool selection.	2.	sharpen tooling or select a better tool for the
				intended operation.
	3.	tool height not at spindle centerline.	3.	adjust tool height to spindle centerline (see Page
				48).
	4.	too much play in gibs.	4.	tighten gibs (see Page 77).
Tapered tool difficult	1.	Quill is not retracted all the way back into	1.	turn the quill handwheel until it forces the tapered
to remove from		the tailstock.		tool out of quill.
tailstock quill.	2.	Contaminants not removed from taper	2.	Clean the taper and bore, then re-install tool.
		before inserting into quill.
Cross slide,	1.	gibs are out of adjustment.	1.	adjust gibs (see Page 77).
compound rest, or	2.	handwheel is loose or backlash is high.	2.	tighten handwheel fasteners, adjust handwheel
carriage feed has				backlash to a minimum (see Page 76).
sloppy operation.	3.	leadscrew mechanism worn or out of	3.	adjust leadscrew to remove end play (see Page
		adjustment.		77).
Cross slide,	1.	Dovetail ways loaded with shavings, dust,	1.	remove gibs, clean ways, lubricate, and re-adjust
compound, or		or grime.		gibs.
carriage feed	2.	gib screws are too tight.	2.	loosen gib screw(s) slightly (see Page 77), and
handwheel hard to				lubricate bedways.
move.	3.	backlash setting too tight.	3.	slightly loosen backlash setting (see Page 76).
	4.	bedways are dry.	4.	lubricate bedways/ball oilers.
Cutting tool	1.	tool holder not tight enough.	1.	Check for debris, clean, and re-tighten.
or machine	2.	Cutting tool sticks too far out of tool holder;	2.	re-install cutting tool so no more than 1⁄3 of the total
components vibrate		lack of support.		length is sticking out of tool holder.
excessively during	3.	gibs are out of adjustment.	3.	adjust gibs at affected component (see Page 77).
cutting.	4.	Dull cutting tool.	4.	replace or resharpen cutting tool.
	5.	incorrect spindle speed or feed rate.	5.	use the recommended spindle speed and feed rate.

-74- Model G0740 (Mfg. Since 11/12)