Lathe turning – Smithy GN1300 User Manual

Page 89

background image

Lathe Turning

Cause

Solution

• Tool dull

• Sharpen or replace tool

• Tool not ground properly

• Regrind tool

• Tool at wrong angle

• Correct tool position

• Tools not held tightly

• Tighten toolholder

• Wrong cutter for material

• Use correct cutter

• Cutting speed incorrect

• Increase or reduce speed

2. Work has unwanted taper

Cause

Solution

• Work improperly aligned

• Realign centers on work

• Debris in spindle, setup, or tools

• Clean and reset setup, work, or

tool

• Offset tailstock incorrectly positioned

• Correct position of tailstock

• Spindle bearings loose

• Tighten taper bearings to return to

alignment, replace spindle

bearings

3. Machine vibrates

Cause

Solution

• Work mounted wrong

• Remount work

• Speed too high

• Reduce Speed

• Too much pressure at tailstock

• Reduce pressure and increase

lubrication

4. Work stops turning but machine continues to run

Cause

Solution

• Work not mounted securely

• Remount work

• Tools forced into work/ excessive cut

• Reduce force on tools

• Belts slipping

• Tension belts, use belt dressing, or

replace belts

5. Diameter of work is not consistent

Cause

Solution

• Too much flex in workpiece

• Use a follow rest, use tailstock

center

• Too much flex compound rest,

• Tighten gibs, clean ways

cross slide, or carriage

Granite 1300 Series Operator’s Manual

12-3

For Assistance: Call Toll Free 1-800-476-4849