For Machines Mfg. Since 3/11

TR O U B L E S H O OTI N G

16-Speed Gearhead Lathe

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 80).

 

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 is unbalanced.

5.

Re-balance chuck or faceplate; contact a local

 

 

 

 

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. 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 centerline.

3.

Adjust tool height to centerline (see Page 49).

 

4.

Too much play in gibs.

4.

Tighten gibs (see Page 77).

 

 

 

 

 

 

 

 

 

 

Tapered tool

1.

Quill is not retracted all the way

1.

Turn the tailstock handwheel until it forces the

difficult to remove

 

back into the tailstock.

 

tapered tool out of 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.

Adjust gib screw(s) (see Page 77).

compound, or

2.

Handwheel is loose or backlash is

2.

Tighten handwheel fasteners, adjust handwheel

carriage feed has

 

high.

 

backlash to a minimum (see Page 75).

sloppy operation.

3.

Leadscrew mechanism worn or out

3.

Adjust leadscrew to remove end play (see Page 76).

 

 

of adjustment.

 

 

 

 

 

 

 

 

 

 

 

 

Cross slide,

1.

Dovetail slides loaded with

1.

Remove gibs, clean ways/dovetails, lubricate, and

compound, or

 

shavings, dust, or grime.

 

re-adjust gibs.

carriage feed

2.

Gib screws are too tight.

2.

Loosen gib screw(s) slightly, and lubricate bedways

handwheel is hard

 

 

 

(see Page 77).

to move.

3.

Backlash setting too tight (cross

3.

Slightly loosen backlash setting (see Page 76).

 

 

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 13 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.

Adjust gib screws at affected component (see Page

cutting.

 

 

 

77)

 

4.

Dull cutting tool.

4.

Replace or resharpen cutting tool.

 

5.

Incorrect spindle speed or feed rate.

5.

Use the recommended spindle speed.

-87-

Page 93
Image 93
Southbend SB1053F Turn-X owner manual Tr O U B L E S H O Oti N G

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