Slewing bearings carry crane and excavator loads, and the races are hardened before finishing. This clip shows a PCBN insert machining a hardened bearing ring.
What the clip shows
- Large bearing ring, hardened before turning
- PCBN insert on a curved, interrupted surface
- Race surface left for the finishing operation
Why this insert suits the cut
Bearing steel hardens to a level where carbide edges fail quickly. PCBN holds the edge through the interrupted contact of a bearing race, where the insert crosses holes and grooves.
Where this part is used
Slewing rings are used on cranes, excavators and wind turbine yaw systems. The race finish decides bearing life and noise.
What to send with an inquiry
- Ring diameter and race hardness
- Interruptions: holes, grooves, split lines
- Roundness and surface requirement