Andrew Ayre wrote: > Hi Rayh, > > Can you tell me or point me to a website that describes the process for > measuring backlash? Thanks. Assuming the screws are mounted on a machine, you put a dial indicator (preferably one that reads out in .0001" units -- they call that a "tenths reading" indicator) across the slide and step the control back and forth, seeing how many units you need to move the CNC control before the axis actually moves. If you want to know the backlash on a ballscrew and nut set sitting alone on a table, you'd have to build some sort of test rig to evaluate it. You'd need to hold the screw rigid and prevent the nut from turning, and then apply force to the nut and read linear free play with the dial indicator.
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