Hydrostatic bearing systems – wear-free, precise, with high running smoothness

ZOLLERN offers hydrostatically mounted spindles, rotary tables, guides and bearing components for applications where freedom from wear, a high level of precision and running smoothness are required.
For hydrostatic bearings, moving parts and housing are separated from each other by an oil film, independent of the load or sliding speed. There is no direct contact. Sliding bodies or the like are not used.

Unique restrictor system

With the patented running clearance throttle, ZOLLERN has developed a unique and variable restrictor system, which is directly integrated into the hydrostatic bearing. External regulators, capillaries, hydraulic orifices or multiple pump circuits, as required by other hydrostatic bearing systems, are not required. In addition, there is no need to adjust the throttle system during commissioning. The optimal pocket pressure is therefore always set, regardless of the production tolerances.

Specials
Applications

Turning machines

Hydrostatic workpiece spindles, rotary tables, rotary axes for tool turrets or bearing components for the area of hard turning

  • Very good damping properties
  • Very good concentricity and axial runout accuracy
  • Very high positioning accuracy
  • High achievable surface quality
  • Thermally stable

Milling machines

Hydrostatic milling spindles, rotary tables or bearing components for the area of hard milling

  • High bearing resilience
  • Very good damping properties
  • High achievable surface quality
  • Very high positioning accuracy

Fine boring machines

Hydrostatic spindle units for piston and connecting rod machining in the automotive industry

  • Very high concentricity and axial runout accuracy
  • Exceptionally high damping of vibrations from the machining process
  • High achievable surface quality

Grinding machines

Hydrostatic tool or workpiece spindles, rotary tables as well as bearing components for use in grinding machines

  • Very good damping properties
  • Very high concentricity and axial runout accuracy
  • Very high positioning accuracy
  • Thermally stable

ECM machines

Hydrostatic bearings as sleeve bearings for use in ECM machines

  • Ideal for quickly oscillating movements
  • No deficient lubrication for short strokes
  • No bearing wear
  • High bearing resilience

Measuring machines

Hydrostatic rotary tables for coordinate measuring machines

  • Very high positioning accuracy
  • Drive via torque motor or belt drive

Paper industry

Hydrostatic bearings as breast roll bearing in paper machines

  • Combined radial and axial movement possible
  • Very good damping properties
  • Wear-free

Test applications, special applications

Hydrostatic bearings in cement mills or in test benches

  • High bearing resilience
  • Low friction
Videos

Run-out measurement of a ZOLLERN hydrostatic spindle

Hydrostatic spindles distinguish themselves by high concentricity. By the high resolution of the Lion measuring device 0,2 µm run-out accuracy is verified.

Hydrostatic spindle unit with ZOLLERN clearance compensator

The ZOLLERN clearance compensator ensures optimum pocket pressure in the spindle unit. It is integrated into the fully hydrostatic bearing part of the spindle and the optimum pocket pressure is automatically set within the manufacturing tolerances. The patented clearance compensator is a self-regulating system with fast control behaviour and high rigidity. It is used in spindles as well as in hydrostatic rotary tables and linear guides.

Service

ZOLLERN customer service offers fast spare parts deliveries, technical findings with repair report, high quality repairs by the manufacturer, assembly work worldwide, and commissioning support.

  • Original spare parts
  • Retrofitting, revision and repair
  • Sales force
  • Error analysis on site
  • Maintenance service
  • Commissioning on site
  • ZOLLERN training centre
  • Diagnostics and condition monitoring
  • 24/7 support, service hotline