23R BLOCK-HEAD®

Designed to support a liquid-mirror telescope lens, the model 23R is an example of the large-scale, special-purpose air bearing Professional Instruments Company builds to solve a customer’s particular problem. When ultra-high accuracy is paramount, regardless of load, our design services will offer you a solution. Specifications (at 150 psi) Load Capacity Ultimate Working Radial 6670 N 3340 N Axial 66700 N 33400 N Tilt 5650 N-m 2830 N-m Stiffness Radial 700 N/micrometer Axial 7000 N/micrometer Tilt 170 N-m/microradian Error Motion Radial < 25 nanometers Axial < 25 nanometers Tilt < 0.1 microradian Total Weight 9800 N Rotor Weight 6200 N Rotor Inertia 1.73 kg-m2 Maximum Speed Application Dependent Air Consumption < 280 L/min English Specifications

Load capacity and stiffness are approximately linear with air pressure.

Ultimate load capacity is measured when metal-to-metal contact is made across the bearing surfaces. Working load capacity is half of the ultimate load capacity. Rotor weight must be included as part of total spindle load.

Axial and tilt loads are supported by the same bearing surfaces. Consequently, a load applied in one mode reduces the other mode proportionally.

High speed or high inertia applications require rotor containment. Maximum speed is dependent on application. Consult Professional Instruments for further information with regard to speed.