Station 08Station 08
Commutator Turning
Commutator turning gives the brush contact surface its final roundness and surface finish. Runout left here becomes brush bounce, sparking and reduced brush life in the finished motor, which is why turning is the process most closely tied to motor lifetime.
Precision turning is the process Bocadar's engineering team describes as its specialty. Machines use three-axis servo feeds and diamond tooling; runout after turning is ≤0.008 mm TIR with a surface finish of Ra ≤0.8 μm, measured between centres.
Stations in this process
- Commutator turning
- Controls: Runout, surface finish
08
Machines for this step
Station 08
Station 08| Model | Cycle time | Runout | Surface finish |
|---|---|---|---|
| Three-Servo Commutator Turning MachineBKD-CT-03 | 10.0 s | ≤0.008 mm | Ra ≤0.8 μm |
| Automatic Commutator Turning MachineBKD-CT-01 | 12.0 s | ≤0.012 mm | Ra ≤1.2 μm |
Related articles
Published 2026-09-05
Commutator turning: why runout decides brush life
What runout is, how it is measured, what causes it upstream of the turning station, and what a servo turning machine can and cannot correct.
By Chen Guoqiang
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