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The easiest way to measure the backlash is with a dial indicator and manual jogging. There are a lot of vids on youtube about it.

To find out if you had lost steps, just program and run in the air...

Have a look in your code to see the start and finish positions of your circles. It seems that they may be different.

As for backlash, yes ballscrews do have backlash if they are not preloaded, you...

Yes correct but don't be too diappointed because the slaving works well, as you'll see in the video and remember this is just a Beta version of the plug-in.
I mention my view on this this in the...