Slewing bearings are divided into internal gears and external gears and no gear, which are usually processed by gear hobbing machines or gear shaping machines.

The advantages of external gear slewing bearing: the processing of the external gear is more convenient, the limited space of the slewing bearing can be used to the maximum, fault diagnosis, gear meshing inspection is easy, due to the larger pitch circle diameter of the ring gear, it can be better obtained. Transmission ratio, greatly reducing the circular force and torque on the pinion.

After the heat treatment of the tooth surface and the raceway surface, the quenched and tempered steel of the slewing bearing will change to a certain extent. The formation of tempered martensite greatly affects the structural stress of the workpiece. The ring body of the slewing bearing will shrink to a certain extent, and the poor processing of the slewing bearing will cause significant changes in the size of the part and the size of the blank.