Damage Condition
Severe friction resulted in serious wear on the rolling contact surface of raceways.
Possible Causes
- Insufficient lubrication
- Intrusion of contamination
- Poor assemble accuracy (Misalignment)
Countermeasures
- Review the lubricant and lubrication method
- Improve sealing capability
- Take measures against misalignment
Wear 1
Part: Ball nut
Symptom: Serious wear due to severe friction
Cause: Severe wear developed because the grease was completely washed away from the ball nut when overhauling the ball screw
Wear 2
Part: Screw shaft
Symptom: Serious wear due to severe friction
Cause: Abnormal wear was caused because of fine iron contamination
Source: NSK