Indentations from Particles Causes and Countermeasures

How:

1. Solid contaminants can be introduced into a bearing via the seals or lubricant. After constant rotation, particles will be pressed into raceways and causes indentation.

Possible source of particles:

1. Dust and metal debris exist in bearing assembly or operating environment.

Indentations resulting from particles:

Indentations by soft metal debris

Indentations by hardened steel debris

Example of SEM/EDS elemental analysis:

Countermeasures:

1. 1. Improve the cleanliness of entire environment to reduce the possibility of particle intrusion.
2. 2. Use adequate sealing to protect the bearing.