Southbend sb1015f specifications Tr O U B L E S H O Oti N G

For Machines Mfg. Since 7/09 TR O U B L E S H O OTI N G EVS Toolroom Lathes

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 belt(s).	2.	Tighten/replace the belt as necessary (Page 69).
running.	3.	V-belt pulleys are not properly	3.	Align the V-belt pulleys.
		aligned.
	4.	Worn or broken gear present.	4.	Inspect gears and replace if necessary.
	5.	Chuck or faceplate has become	5.	Rebalance chuck or faceplate; contact a local
		unbalanced.		machine shop for help.
	6.	Gears not aligned in headstock or	6.	Adjust gears and establish backlash.
		no backlash.
	7.	Broken gear or bad bearing.	7.	Replace broken gear or bearing.
	8.	Workpiece is hitting stationary	8.	Stop lathe immediately and correct interference
		object.		problem.
	9.	Spindle bearings at fault.	9.	Rest 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 center line.	3.	Adjust tool height to center line (Page 41).
	4.	Too much play in gibs.	4.	Tighten gibs (Page 66).
Tapered tool	1.	Quill is not retracted all the way	1.	Turn the quill handwheel until it forces taper out of
difficult to remove		back into the tailstock.		quill.
from tailstock quill.	2.	Contaminants not removed from	2.	Clean the taper and bore and re-install tapered tool.
		taper before inserting into quill.
Cross slide,	1.	Gibs are out of adjustment.	1.	Tighten gib screw(s). See (Page 66).
compound, or	2.	Handwheel is loose or backlash is	2.	Tighten handwheel fasteners, adjust handwheel
carriage feed has		high.		backlash to a minimum.
sloppy operation.	3.	Lead screw mechanism worn or out	3.	Adjust leadscrew to remove endplay (Page 66).
		of adjustment.
Cross slide,	1.	Dovetail slides loaded up with	1.	Remove gibs, clean ways/dovetails, lubricate, and
compound, or		shavings, dust, or grime.		readjust gibs.
carriage feed	2.	Gib screws are too tight.	2.	Loosen gib screw(s) slightly, and lubricate bedways.
handwheel is hard	3.	Backlash setting too tight (cross	3.	Slightly loosen backlash setting (Page 66).
to move.		slide only).
	4.	Bedways are dry.	4.	Lubricate bedways and handles.
Cutting tool	1.	Tool holder not tight enough.	1.	Check for debris, clean, and retighten.
or machine	2.	Cutting tool sticks too far out of tool	2.	Re-install cutting tool so no more than 1⁄3 of the total
components vibrate		holder; lack of support.		length is sticking out of tool holder.
excessively during	3.	Gibs are out of adjustment.	3.	Tighten gib screws at affected component.
cutting.	4.	Dull cutting tool.	4.	Replace or resharpen cutting tool.
	5.	Incorrect spindle speed or feed rate.	5.	Use the recommended spindle speed.

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