The combination of reasonable load capacities with 10,000 rpm maximum speed makes the model 4R a first choice for most high-accuracy applications. The stator’s generous mounting surfaces provide for an extremely rigid assembly, while the compact structure allows an installation where conventional spindles will never fit. Specifications (at 150 psi) Load Capacity Ultimate Working Radial 440 N 220 N Axial 1780 N 890 N Tilt 45 N-m 23 N-m Stiffness Radial 120 N/micrometer Axial 350 N/micrometer Tilt 0.45 N-m/microradian Error Motion Radial < 25 nanometers Axial < 25 nanometers Tilt < 0.1 microradian Total Weight 85 N Rotor Weight 34 N Rotor Inertia 0.0052 kg-m2 Maximum Speed 10,000 rpm Air Consumption < 55 L/min English Specifications

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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.