Southbend SB1224 instruction sheet Troubleshooting, Symptom Possible Cause Possible Solution

Model SB1224 I N S T R U C T I O N S Mfg. Since 1/11

Troubleshooting

Symptom

Possible Cause

Possible Solution

The chuck key	1.	Jaws poorly positioned.	1.	Re-install jaws in correct order and position.
is hard to turn,	2.	Lack of lubrication; rust, burrs, metal	2.	Disassemble, de-burr, clean, and re-lubricate chuck
or it binds
		chips, or contaminants inside chuck.		with chuck grease.
at some jaw
	3.	Jaw guides, scroll gear, or pinion	3.	Replace damaged parts, or replace chuck.
locations.
		distorted, worn, or broken.
Chuck mounts	1.	Chuck is loose or cocked on spindle; gap	1.	Remove chuck then clean and dress all mating
or seats		between spindle/chuck mating.		surfaces of spindle & chuck.
incorrectly;	2.	Chuck is too large for lathe.	2.	Install smaller lathe chuck so spindle and bearings
gap exists
				will not become overloaded and vibrate.
between chuck
	3.	Lathe spindle is loose.	3.	Check and adjust lathe spindle end-play and
and spindle;
				bearing preload.
chuck vibrates
during	4.	Camlock studs are at fault.	4.	Remove chuck and inspect/adjust/replace camlock
operation				studs for wear or damage as required. Re-install
without a				chuck with registration marks aligned.
workpiece	5.	Lathe spindle is loose.	5.	Check and adjust lathe spindle end-play and
installed.
				bearing preload. Adjust as required.
	6 .	Poor chuck/spindle taper fit causes	6 .	Isolate component at fault by installing a different
		radial or axil runout from chuck shifting		chuck. If problem persists, lathe spindle may be at
		when camlocks are tightened.		fault. If problem goes away, chuck may be at fault.
	7.	Chuck is distorted or cracked.	7.	Replace chuck.
Workpiece	1.	Workpiece is too long for jaw clamping	1.	Use tailstock, rests, and outboard spindle support;
has runout;		only.		use slower spindle speeds.
clamping	2.	Workpiece is improperly clamped or is	2.	Remove jaws, then clean, de-burr, and re-install.
accuracy or
		misaligned.
repeatability is
	3.	Jaws are positioned in the wrong jaw	3.	Re-install jaws in their correct guides.
poor; turning
results are		guides.
poor.	4.	Top jaws are loose or improperly seated	4.	Remove jaws, clean jaw teeth and guides, then re-
		in their master jaws.		install jaws using the correct torque for fasteners.
	5.	Chuck is loose; mounting is off center or	5.	Refer to troubleshooting for chuck mounting
		improperly seated.		incorrectly.
	6.	Lathe spindle, tailstock, or cross slide is	6.	Align lathe components.
		misaligned with lathe bed.
	7.	Lathe bed is twisted.	7.	Place shims under lathe to level bed ways.
The workpiece	1.	Workpiece requires additional support	1.	Use tailstock, rests, and outboard spindle support.
slips in the		in addition to chuck jaws.		Use slower spindle speed.
jaws.	2.	Incorrect jaw or workpiece clamping	2.	Re-position jaws and workpiece for maximum scroll
		position.		gear and jaw engagement. Verify that workpiece is
				not too large or heavy for chuck.
	3.	Two-piece jaw is loose; top jaw	3.	Remove jaws, clean mounting surfaces, and re-
		improperly seated in master jaw.		install with the correct cap screw torque.
	4.	Insufficient pinion and scroll gear	4.	Lubricate chuck, and re-tighten the chuck key.
		torque.
	5.	Jaws or jaw screws bind before full	5.	Service the chuck as described in this document.
		clamping force is achieved.
	6.	Cutting overload.	6.	Reduce cutting depth or feed rate.
	7.	Jaw teeth worn; 2-piece jaw is loose.	7.	Have jaws reground, replace jaws, or replace chuck.

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