In this grinding process the end faces of the tapered rollers are pre-ground and finished in one pass.
A very fine surface finish and exact geometry must be achieved
The roller is guided by the end faces within the bearing; a very fine surface finish and exact geometry must be achieved. Reduced undulations on the end face significantly improve the smoothness of the subsequent tapered roller bearing.
In order to achieve this in a short space of time (up to 200 rollers per minute), multi-layered resin grinding wheels with aluminium oxide in grit sizes 180 to 400 are used.