The most common problems with a lathe spindle are vibration, noise and surface finish.
Vibration is caused by runout. Look first at your workholding and your material. Ensure the chuck body or collet nose runs true; that your jaws are bored correctly; that your material isn’t running out. If you are bar feeding make sure the liner fits the material properly. If you still have a problem check runout of the hydraulic closer, the brake disc and all adapters.
If you haven’t fixed noise by addressing vibration above then the most likely cause is the drive belt. Make sure tension is correct; that the belt is in good condition; that shaft alignment is good and the belt isn’t forced against a pulley flange.
If you have a surface finish problem that hasn’t been solved by the above then check the application: speeds, feeds, tool tip alignment, coolant flow, etc. also check machine alignments.
For more lathe spindle symptoms please view the troubleshooting table below. For reference, the spindle drivetrain consists of the following:
- Chuck or Collet
- Spindle Shaft
- Non-Contact Encoder Ring
- Non-Contact Encoder Read-Head
- Hydraulic Actuator
- Coolant Collector