“Where others give up, we begin.”
Subcon CNC Cylindrical and Bore Grinding
For Ultra-Precision machining spindles, the spindle shaft is a key component. Any shape or alignment error would later affect the spindle error, and with guaranteed spindle errors under 12 nm for our ASD-Px e.g., this means that CNC cylindrical external grinding is one of our key technologies. But not only the bearing faces of a shaft need to have exceptionally small shape and alignment tolerances and near-mirror surface finish. The better the spindle tapers, the better the tool change repeatability, run-out and balance. To achieve a dynamic tool run-out of under 0.3 micron and a tool change repeatability of less than 200 nm requires a total taper run-out of under 50 nm in our production. Same applies to the central bore of a shaft that allows to accomodate the draw-bar. With 20 mm in diameter and 210 mm in length bore grinding itself is already very challenging, but should this bore more than 5 micron eccentric to the radial bearings, the spindle would not be able to reach top speed, because the dynamic imbalance would cause the shaft to bend and would ruin the well-optimized rotor dynamics.
Thus, cylindrical and bore CNC grinding is one of our manufacturing expertises.
If you’ve been told that the grinding work you asked for can’t be done, ask us!
Machining Capabilities
2 x Studer S31 (improved with Levicron Spindles)
- CNC cylindrical external/internal center grinding machine
- Z: 1,000 mm
- Center Height: 160 mm
- Wheels / Spindle Heads (turret-configuration):
- D 500 mm
- D 400 mm
- Internal Bore Grinding Spindle
- Work head accuracy: < 0.2micron
- In-process Measure Control Heads: 2 x diameter, 2 x axial face
- Ambient temperature control: < 0.5 °C
- Machine coolant temperature control: < 0.1 °C
- Customized Air Bearing Fixtures
2 x Precitech FreeForm 700 (improved with Levicron Spindles)
- Ultra-Precision CNC cylindrical bore grinding machine
- Oil-Hydrostatic Guides, Aerostatic Motor Spindles
- Swing Capacity: 700 mm
- Controller Resolution: 32 pm
- Grinding Spindle: Levicron ASD-H25, max. 60,000 rpm
- Work-holding Spindle: Levicron ASD-Px
- Ambient temperature control: < 0.5 °C
- Machine coolant temperature control: < 0.1 °C
- Customized Air Bearing Fixtures
Achievable Tolerances (see production drawing)
- Dimensional, external diameter: 0.7 micron
- Dimensional, internal diameter: 0.4 micron
- Dimensional, length. 1 micron
- Roundness: 50 nm
- Cylindricity: 0.7 micron
- Flatness: 0.5 micron
- Squareness: 0.5 micron
Your contact
Get in touch with us to find out how we can make your grinding work possible
