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cable chain meshing with sprocket

cable chain meshing with sprocket

cable chain meshing with sprocket

(OP)
I have been working with a design for a vertical moving stage to focus a microscope target.  It uses a stepper motor connected to a cable chain and sprocket driving a lead screw and a nut connected to the stage.  Chain and sprockets have a 2:1 ratio and the lead screw has a 1mm pitch.  Anyway, in the end I get about 3 microns per motor step.  

The problem is that when I remove the current from the motor, the sprockets move. It also does this when I turn the sprockets by hand.  I think it is compliance in the plastic coated cable chain (W.M. Berg). I need to get rid of this "lash".  Any thoughts?

 

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