Construction and attributes of hydrostatic center bearings
• Only one radial bearing • Moment and axial forces are carried by an axial bearing • Integrated clamping piston and rotating oil union for a hydraulic collet. The clamping piston is driven with hydrostatic oil and released with springs. • Extremely minimal friction (results in minimal warming during continuous operation, and more of the motor drive force applied to the workpiece). • Any minimal heat buildup is immediately carried out of the spindle via oil and is cooled at the hydraulic unit. • No vibration (as can result from balls in bearings) provides for extremely silent operation. • Excellent damping of oscillations created by machining operations, resulting in very good surface finish, improved cutter life (especially beneficial when turning hard materials). • Very high axial and radial stiffness (high dimensional accuracy when finishing; inaccuracies from pre-machining are quickly equalized; excellent roundness of finished diameters even with interrupted cuts). • RPM-independent stiffness and loadability (workpiece speeds of 0 to max. RPM are possible). • Wear-free because there is no contact between surfaces. • No loss of accuracy under maximum loads. • No sensitivity to dirt because the bearings are continuously cleaned. • Gap seals are backed up with purge air to protect the hydrostatic system from cutting fluids. • The spindle is supplied with a customized hydraulic power unit with oil cooling capability and integrated bearing protection in the event of power failure. • Can be driven by belt or gear drive. • Static and dynamic bearing forces from cutting or unbalance can be monitored by measuring pressure in the hydrostatic pockets.
Technical Details
Working speed: 0-3000 RPM Duty at 3000 RPM: approx. 3.0 kW Max. pump duty: 3.5 kW Pump pressure: 63 bar Max. oil flow, bearing: 18 l/min Max. oil flow, clamping cylinder: 8 l/min Max. oil temp. increase at 3000 RPM: 12 deg. C Spindle passage: 115 mm
Hydrostatic Universal Bearings
- Frictionless even at minute revolutions
- Transmits minute rotating motion
- No backlash when reversing direction
- Slip-stick effect is eliminated DetailsPDF
Hydrostatic Lathe Spindles
- Very low friction will heat the spindle only slightly. Nearly all motor power gets to the
workpiece. Heat that is generated is moved immediately out of the spindle... DetailsPDF
Hydrostatic Linear Motor Guide
The PM Flow Controller makes it possible for machine builders to easily integrate custom hydrostatic systems into both new and existing machines. DetailsPDF
CBN Hydrostatic Grinding Spindle Systems
This is an example of a hydrostatic spindle designed for high speed grinding with CBN grinding wheels. The small bearing diameter in combination with high surface speed allows... DetailsPDF
HSK Master Setting Gauges
To guarantee accurate and repeatable machine accuracy, various other components in the total machining process need to be correctly and accurately positioned. The Center Height... DetailsPDF
KM Master Setting Gauges
To guarantee accurate and repeatable machine accuracy, various other components in the total machining process need to be correctly and accurately positioned. The Center Height... DetailsPDF
Capto Master Setting Gauges
To guarantee accurate and repeatable machine accuracy, various other components in the total machining process need to be correctly and accurately positioned. The Center Height... DetailsPDF
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PDF data sheet: Hydrostatic Center Bearings (240.435)
