| Condition | Cause | Solution |
|---|---|---|
| Surface is speckled visually and the speckles are clusters of tiny pits when viewed through a microscope. Further development leads to a corrugated surface. | Electric current passes through bearing, and sparks are generated to fuse the raceway surface. | Avoid flow of electric current by averting current with a slip ring or insulation bearing. |
- Inner ring of cylindrical roller bearing
- Raceway surface is corrugated by electric pitting
Photo 5
- Rollers of tapered roller bearings
- Electric pitting at middle of rolling contact surfaces
Photo 6
- Magnified (x400) pitting of roller shown in Photo 5
- Nital etchant develops a white layer on the cross section
Explanation of magnified photo 6
