High precision, high productivity turning center
The turning center Kummer K250 has been designed from the start to fully release the accuracy, acceleration and speed potential of linear motors. The LINEAR SLIDES KINEMATICS concept LSK enables up to 10 m/s² accelerations, respectively, on compact strokes of 250 mm x 100 mm, up to 60 m/ min rapid traverses for submicron repositioning accuracy ! The machine standard configuration essentially features an ultra light direct drive mobile suspended spindle headstock mounted on an ultra rigid 7 ton base composed of a steel-framed chassis filled with water based concrete.
The mobile mass therefore only accounts for 2,5% of the machine total weight.
- Unproductive time reduced by over 50%.
- Integrated and thermally stabilized linear motors.
- Direct measurement of the slide movements by a single ruler with 2 cursors (resolution 0,01 µm).
- No residual faults from the ball screws.
Several mobile direct drive spindles are available, according to the requirements of the specific machining solution. The speed range goes from 8’000 rpm to 12’000 rpm. The spindle can be equipped with steel or ceramic precision ball bearings or hydrostatic bearings.
The most frequent applications
- Technical characteristics
K250 Type Single or double spindel turning machine Guideways High precision central-lubricated preloaded roller bearings Drives Linear motors Acceleration 10 m/s² Rapids 60 m/min (on 250 mm stroke) Slides motion measuring Direct reading on optical scale. Water and chip exclusion guaranteed by air flow. Measurement resolution 0,01 μm Workheads from 8000 to 12000 rpm
Ball or hydrostatic bearings
Numerical control Siemens 840D Floor space 4'250 x 3'215 mm (manual loading configuration) Weight Approx. 7’000 kg Options and accessories - Profiler for axial and radial profiles
- High frequency (HF) spindle
- Spindle for additional grinding
- In-process or post-process measurements