Hi there,

You're right, reverse engineering is acceptable method.. but only on basis of accurate measurements. Now you've described your calibration setup then I've got no issues as regards your positioning/backlash results.

However, as I mentioned and manual confirms backlash compensations not the way to go really... don't know what your planning to make but I would try and devise a mechanical method of getting the backlash out.. there should be a few mechanical solutions up at cnc zone.. would make your life a lot easier in the long run

what length is the axis screw... have you thought of replacing it with an industry part of ebay or the like... smaller lengths are usually pretty cheap...