The HSR08 is a high precision, direct encoded, worm gear driven rotary stage.  While most high resolution, direct encoded rotary stages use direct drive servo motors, some applications need the at-position stability offered by a stepper motor.  Other applications benefit from the torque amplification of a gear drive, or the ability to support a torsional load without applying power.  In the configuration pictured above, a 0.45° stepper motor achieves a positioning resolution of better than 0.3 arc-sec.  Bidirectional repeatability is better than ±1.0arc-sec.  Low wobble error and high stiffness is achieved by using precision matched, preloaded angular contact bearings in conjunction with a strong body and hub made of 7075 aluminium.  To ensure the top mating surface of the hub is parallel to the plane of rotation a final machining operation is performed after the stage is assembled.  Indicated runout at the outside edge is typically less than 3μm.

NOTE: If you are looking for tighter specs and tolerances, we can customize to your needs.