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
BKD-CT-01 · Automatic Commutator Turning MachineStation 08 · Commutator Turning
Cycle time12.0 s
Runout≤0.012 mm
Surface finishRa ≤1.2 μm
Station 08 · Commutator Turning
Automatic Commutator Turning Machine
Model BKD-CT-01
Automatic-loading commutator turning machine for stand-alone cells or line integration where the tightest runout is not required.
- Cycle time
- 12.0 s
- Runout
- ≤0.012 mm
- Surface finish
- Ra ≤1.2 μm
Applicable armatures
- Motor types
- Brushed DC and universal motor armatures
- Armature OD
- 20–55 mm
- Shaft diameter
- 3–10 mm
- Slot count
- 8–24 bars
Specifications
| Parameter | Value | Unit |
|---|---|---|
| Cycle time | 12.0 | s/pc |
| Output | 290 | pcs/h |
| Changeover | 20 | min |
| Spindle speed | 500–2 500 | rpm |
| Tool | PCD / diamond |
| Parameter | Value | Unit |
|---|---|---|
| Runout after turning | ≤0.012 | mm |
| Surface finish | Ra ≤1.2 | μm |
| Parameter | Value | Unit |
|---|---|---|
| Power supply | AC 380 V / 3 ph / 50 Hz | |
| Rated power | 3.0 | kW |
| Air pressure | 0.5–0.7 | MPa |
| Parameter | Value | Unit |
|---|---|---|
| Footprint (L×W×H) | 1 200×1000×1750 | mm |
| Weight | 820 | kg |
| Parameter | Value | Unit |
|---|---|---|
| PLC | Mitsubishi FX3U | |
| HMI | Weinview 7" | |
| Servo axes | 2 |
How it works
- 1The armature is loaded automatically from the conveyor or magazine.
- 2The servo spindle and tool axis perform the turning pass.
- 3Chips are extracted and the armature is unloaded to the next station.
Standard configuration
- Servo drive package and safety guarding with interlocked doors
- PLC with touch-screen HMI, recipe storage per armature model
- One set of tooling for the armature model agreed at order
- Operation and maintenance manual, recommended spare parts list
Options
- Additional tooling sets for further armature models
- Data logging with CSV export or MES interface
- Automatic loading and unloading, conveyor for line integration
- Spare parts package for 12 or 24 months of production
