Grizzly g0747, g0748 owner manual Symptom Possible Cause Possible Solution

Symptom	Possible Cause		Possible Solution
Tool slips in collet.	1.	Collet not fully drawn into spindle taper.	1.	snug up drawbar to fully seat collet.
	2.	Wrong size collet.	2.	use correct collet for tool shank diameter.
	3.	debris on mating surface of collet and	3.	remove oil and debris from mating surface, then
		spindle.		re-install.
	4.	excessive depth of cut.	4.	decrease depth of cut and allow chips to clear.
Tool breakage.	1.	spindle speed too slow or feed rate too	1.	use correct spindle speed (Page 33 or 35) and feed
		fast.		rate.
	2.	tool getting too hot.	2.	use coolant; reduce spindle speed (Page 33 or 35)
				or feed rate.
	3.	excessive depth of cut.	3.	decrease depth of cut and allow chips to clear.
Workpiece chatters	1.	table locks not tight.	1.	tighten all locks on mill that are not associated with
or vibrated during				necessary table movement for the operation.
operation.	2.	Workpiece not securely clamped to table or	2.	Check that clamping is tight and sufficient for
		mill vise.		operation; make sure mill vise is clamped tight to
				table.
	3.	tool not secure or is damaged.	3.	properly secure the tool; replace if damaged.
	4.	spindle speed too fast; feed rate too slow.	4.	use correct spindle speed (Page 33 or 35) and feed
				rate
	5.	gibs too loose.	5.	properly adjust gibs (Page 51).
Table hard to move.	1.	table locks are tightened down.	1.	loosen locks needed for movement.
	2.	Chips have loaded up on ways.	2.	Frequently clean away chips from ways.
	3.	Ways are dry and in need of lubrication	3.	use one-shot oiler to lubricate ways (Page 45).
	4.	gibs too tight.	4.	properly adjust gibs (Page 51).
Bad surface finish.	1.	incorrect spindle speed or feed rate.	1.	use correct spindle speed Page 33 or 35) and feed
				rate.
	2.	dull, damaged or incorrect cutting tool.	2.	use sharp and correct cutting tool for operation.
	3.	Wrong spindle direction for tool.	3.	Check for correct spindle rotation for tool.
	4.	Workpiece not securely clamped to table or	4.	Make sure workpiece is properly clamped to table or
		mill vise.		mill vise; use work holding jig if necessary.
	5.	gibs too loose.	5.	properly adjust gibs (Page 51).
Power feed chatters	1.	Brass bevel gear is not meshed with drive	1.	remove parts from power feed side of X-axis
or grinds during		gear.		leadscrew to ensure bevel gear is properly meshed
operation.				with drive gear; make sure ball handle nut is snug.
	2.	power feed unit at fault.	2.	replace power feed unit.

-50- Model G0747/G0748 (Mfg. Since 8/12)