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I have a simple linear translation stage that is driven by a screw, and I would like to attach a stepper motor to the screw drive. The axis of the screw and the axis of the motor are approximately colinear. The issue is that, as the screw turns it recedes away from (or advances towards) the motor. The spacing between the motor shaft and the screw drive can change by as much as 10 mm. A diagram of the problem and an example of the type of stage are shown below.

How can I couple the stepper motor to the screw drive in a way that allows for this expansion/contraction of the space between the two?

The problem

Translation stage

Chris Mueller
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1 Answers1

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All you need is a sliding base that can keep the motor from counter-rotating. You could use a linear carriage or a shaft and a linear bearing to create the sliding platform.

You attach the fixed end or shaft to the screw drive housing, either directly or via an intermediary like screwing both to lumber, and then you mount the motor on the moving platform. Couple the motor and screw drive together with any ordinary coupling mechanism; flanges, flexible couplings, etc.

Don't forget end stops and making the wiring long enough. First prototype phase is typically where you break all your expensive equipment.

Chuck
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