I have measured .05mm (approx 2 thou) backlash on the X axis of my SX3. I have adjusted the gibs and checked the stepper shaft coupling and there has been no change. I thought that given there is a double ballnut there would be some way of adjusting the backlash there but it is not obvious to me how to do it.
I have attached a photo of the assembly. With the unit assembled as shown there is a small but easily detecable amount of play between the two halves of the ballnut if you hold one and twist the other. Can anyone advise me if/how this can be adjusted and any other things I might do to improve the backlash.