BKD-CT-03 · Three-Servo Commutator Turning MachineStation 08 · Commutator Turning

Cycle time10.0 s

Runout≤0.008 mm

Surface finishRa ≤0.8 μm

Three-Servo Commutator Turning Machine

Model BKD-CT-03

Three servo axes feed a diamond tool across the commutator for low runout and a fine finish. The machine Bocadar's engineers name as their specialty.

Cycle time: 10.0 s
Runout: ≤0.008 mm
Surface finish: Ra ≤0.8 μm

Applicable armatures

Motor types: Brushed DC and universal motor armatures
Armature OD: 20–60 mm
Shaft diameter: 3–12 mm
Slot count: 8–24 bars

Specifications

Performance
Parameter	Value	Unit
Cycle time	10.0	s/pc
Output	340	pcs/h
Changeover	20	min
Spindle speed	500–3 000	rpm
Tool	PCD / diamond
Commutator OD range	10–35	mm

Precision
Parameter	Value	Unit
Runout after turning	≤0.008	mm
Surface finish	Ra ≤0.8	μm
Diameter repeatability	±0.005	mm

Electrical & pneumatic
Parameter	Value	Unit
Power supply	AC 380 V / 3 ph / 50 Hz
Rated power	4.0	kW
Air pressure	0.5–0.7	MPa

Dimensions & weight
Parameter	Value	Unit
Footprint (L×W×H)	1 300×1100×1800	mm
Weight	950	kg

Control
Parameter	Value	Unit
PLC	Mitsubishi FX5U
HMI	Weinview 10"
Servo axes	3 (spindle + X + Z)

How it works

1The armature is located on centres or a precision collet.
2The spindle runs at the programmed speed while the X and Z servo axes feed the diamond tool.
3A finish pass removes the last stock at low feed for surface quality.
4Chips are extracted and the part 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

Questions

What commutator runout does the machine hold?

≤0.008 mm TIR on the turned surface, measured between centres. What reaches the finished motor also depends on shaft straightness and commutator pressing, which the turning station cannot correct.