RIMAC BETAMATIK Kollektor-Glimmerfräsmaschine
Key-Way Milling Machine – Horizontal

The RIMAC BETAMATIK is a specialised collector mica milling machine for the manufacture and repair of electric armatures and commutators. It is used for the precise milling or undercutting of the mica insulation between the individual copper lamellae of a collector.

The mica joints are detected by a laser optical system. A stepper motor then automatically positions the armature from lamella to lamella. The milling cutter is automatically raised during the return stroke. According to the data sheet, the machining time is approximately 0.8 to 1.3 seconds per lamella.

The machine can process armatures up to a diameter of 100 mm, collectors up to 70 mm in diameter and shafts up to 500 mm in length. The maximum milling length is 60 mm. The milling spindle reaches 8,000 rpm.

The machine, originally purchased around 1983/1984, was extensively modernised and mechanically overhauled in 2005. Among other things, a new control cabinet with a Siemens S7 PLC, a touchscreen control panel, laser optics, new sensors, a reinforced spindle with belt drive, new solenoid valves, new cabling and a protective enclosure with safety monitoring were installed.

An interesting specialised machine for electric motor manufacturers, armature winding workshops, commutator manufacturers and repair workshops.

Technical specifications:
Year of manufacture: 1984
Modernisation: 2005
Maximum armature diameter: 100 mm
Maximum collector diameter: 70 mm
Milling length: 0–60 mm
Maximum shaft length: 500 mm
Spindle speed: 8,000 min?¹
Positioning accuracy: approx. 0.01–0.03 mm
Processing time: approx. 0.8–1.3 seconds per lamella
Electrical connection: 380 V / 50 Hz / 3-phase
Required air pressure: 6–10 bar
Milling cutter type: carbide milling cutter Ø 15 mm with 5 mm bore or Ø 10 mm with 3 mm bore
Workpiece positioning: via stepper motor
Mica joint detection: laser optics
Extraction: fitted or provided for

Modernisation in 2005
According to the available documentation, the refurbishment comprised:
new control cabinet with Siemens S7 PLC
new control panel with touchscreen
laser optics including control unit
complete rewiring
new sensors
new, reinforced spindle with belt drive
new solenoid valves
complete mechanical overhaul
repainting
modification or extension of the protective enclosure
safety limit switches on the protective hood
updated operating instructions

Features and functions
automatic detection of mica gaps
automatic step-by-step positioning of the armature
adjustable milling and return speeds
automatic milling cutter lift during return
adjustable milling depth
Pneumatic workpiece clamping and tailstock operation
Enclosed working area with protective hood
Integrated or connected extraction system
Siemens PLC control
Touchscreen operation