Air Bearing Rotation Stage with Large Aperture for Test, Metrology, and Precision Manufacturing

Superior positioning and geometric performance, absolute high-resolution encoders, and a large, ⌀260mm clear aperture makes this air bearing stage a precision instrument for optical alignment, metrology, inspection, calibration, and scanning.

April 1, 2020, – PI (Physik Instrumente), a leader in precision motion control and nanopositioning solutions, announces a new large motorized rotary air bearing added to its existing families of PIglide air bearing rotary stages.


Maintenance-Free Nanopositioning Performance

The A-688 stage provides extremely high resolution and geometric performance. The angular resolution is 0.0015µrad (0.00003 arcsec), and flatness and eccentricity are specified better than 175nm and 300nm, respectively. This is made possible by high resolution, absolute encoders, and low-cogging frameless and slotless torque motors. The A-688 rotary stage can be used in any orientation and with no wear, required maintenance or lubrication, has a virtually unlimited life.


Features & Advantages

  • ⌀260mm clear aperture
  • 77kg load capacity
  • 0.0015µrad max. resolution
  • 500 RPM max.
  • Flatness/Eccentricity <175/300nm
  • Wobble: < 1 µrad
  • Direct drive

Why Air Bearings

Air-bearings have no rolling or sliding elements and deliver frictionless, non-contact motion, resulting in negligible reversal error, better flatness, and minimal wobble and eccentricity.  All these are ideal prerequisites for applications such as inspection and metrology, calibration, and scanning of high-end parts (i.e., infrared and precision optics, turbine blades, shafts and bearings) in industries like aerospace, aircraft, automotive, semiconductors, and photonics.

Specifications, Datasheets, More Information »


Substantial Design and Manufacturing Experience, Standard and Custom Systems

PI designs and manufactures all air bearing products in the USA. PI’s engineering team has hundreds of man years of air bearing design and manufacturing experience. In addition to customized systems for OEMs, PI offers a substantial standard product line of air bearing stages that includes motorized and non-motorized, linear, rotary, spherical, X/XY, voice coil, compact, and large scale systems, as a complement to its existing comprehensive range of piezo nano positioning stages, traditional motorized positioners, and hexapod 6-axis parallel positioning systems. The extreme depth and breadth of motion technologies puts PI in the unique position to cover the whole motion range from finger-tip sized nano-positioners to large scale stages with long travel ranges, through a plethora of different drives and guiding systems that can be tailored to meet the needs of an OEM or customer.

Working with You

PI’s in-house engineered systems and components have enabled customers around the world to increase their productivity and technological advantage for 5 decades. With a large basis of standard precision motion products and proven methodologies, PI can quickly modify existing designs or provide a fully customized OEM solution to fit the exact requirements of the application.

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