The rectangular stator of the model 4B allows the choice of six different mounting surfaces, two of them offering lowest-possible centerline height. Although it is more challenging to integrate a frameless motor with a model 4B, a belt-drive arrangement is ideal for many low-to-moderate-torque applications. 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 80 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.