An alternative to traditional mechanical components is a hydrostatic system in which the slides, bearings, and other points of contact are separated by a thin layer of oil under pressure. This system, the patented PM Flow Controller, eliminates all metal-to-metal contact and virtually eliminates wear because components are "floating" on a very thin film of oil.
The PM Flow Controller is a self-contained mechanical device and thus does not require an electronic controller or an external pressure feedback device for operation. The PM Flow Controller maintains an almost steady-state of the hydrostatic gap in the hydrostatic pathways necessary to support a load regardless of grinding or cutting stress, the weight of a workpiece, or its location, by varying the pressure and flow of oil to the pocket.
The PM Flow Controller makes it possible for machine builders to easily integrate custom hydrostatic systems into both new and existing machines.
Features of Hydrostatic Linear Motor Guides
• Friction-free at low speed, very low friction at higher speed • Moves smaller than 0.1 micro-m possible • No friction change when reversing direction, allowing for precise positioning • No slip-stick effect at slow speed • Floats on oil pockets independent of speed and load without any contact, so wear is not possible • No precision loss, even under 24 hour operation at full load and maximum speed • No variation of friction as with balls • A hydrostatic system operates like a damper; excellent damping results in better workpiece surface and tool life • Less sensitive to chips and other debris
Technical Features
• The magnetic force of the motor is countered close to the motor fixture by wear free hydrostatic pockets, resulting in reduced bending stress and bending deformation in the slide and guideway • Low production cost because no surfaces need to be ground to close tolerances • Ideal for horizontal and vertical slides with large acceleration and speed
Hydrostatic Leadscrews
- Speed comparable to a linear motor
- Very low friction when machining, virtually frictionless
during positioning
- Steps in the 0.1 micron range are... DetailsPDF
Application: Hydrostatic Linear Motor Guide
Linear motors are used on high-speed machine tools with high acceleration and slide speeds. For slides with linear motors, HYPROSTATIK has developed hydrostatic guideways... 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
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 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.... DetailsPDF
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PDF data sheet: Hydrostatic Linear Motor Guide (240.320)
