Damage Condition
Balls become free from the ball slide due to broken plastic ball re-circulation parts.
Possible Causes
- Ball re-circulation disabled by abnormal wear caused by lubrication failure and intruded particles (Clogged ball re-circulation path)
- In a case of butting rail specification, a ball re-circulation part collided with the rail at the rail butting position because of excessive misalignment of rails in lateral and vertical directions
- Feed sped exceeded the permissible speed
Countermeasures
- Review the lubricant and lubrication system
- Improve sealing function
- Improve butting accuracy (Lateral and vertical aligning accuracy at butting position)
- Review the feed speed. Focus at linear guide with high speed end cap
Damaged Ball Recirculation Parts
Part: End cap of Ball Slider
Symptom: Balls are free
Cause: End cap is damaged by excessive misalignment at the butting position of two rails. Ball slide operated at high speed in excess of permissible feed speed
Source: NSK
