Ball Screw RCA: Indentations

 

Damage Condition

  • Indentations on the raceway at each ball location similar to the deformation caused by a Brinell Hardness Tester (Brinelling)
  • Indentations on a raceway caused by contamination or metal particles

Possible Causes

  • High-energy impacts or improper handling of the products at installation or in transit will easily cause this damage
  • Caused by contamination or intruded metal particles

Countermeasures

  • Adequate installation and handling
  • Improve sealing capability
  • Filter the lubrication oil


Indentation 1

Part: Screw shaft
Symptom: Indentations on a raceway
Cause: Indentations caused by excessive impact load or by contamination or intruded metal particles

Indentation 2

Part: Screw shaft
Symptom: Indentations on a raceway
Cause: Indentations caused by excessive impact load or by contamination or intruded metal particles
Source: NSK