ultra fine rotation

Hi all,
Does anyone know the cheapest way to build a voltage control
rotational stage that has 0.1 mrad resolution and can travel +/- 0.02
rad? The load is about 2 lb.
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Cheap? A lazy suzan (i.e. cheap turntable mechanism) with two levers joined by a stepper motor driven screw thread. The radius arms as long as needed for the desired resolution. Or even a long arm on a flexure (a metal tape hinge) Commercial stepper driver.
Brian Whatcott Altus OK
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Brian Whatcott

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