Thanks for the idea of manual check ,Craig I have been doing it even before your message, but I do not trust it to be very accurate. What about me calculating a deviation on the pass of 1000 mm,as precise as I can, still there would be to some fractions of the mm. Then running a code which will move the machine a mile or two? My tiny error would grow to the point of being a big problem.
I intend to work on 3d carving with very tiny details and the tool paths are going to be extremely long. Essentially I agree this kind of "reverse engineering" measuring should greatly improve my motor settings, but I am still worried. Z axis is the biggest problem as is to short to catch the error with great precision, and deviation here will have a major impact on my 3d carving. I can ask manufacturer for all the info required to calculate, but would you help me to run it through the formula, Craig? There is a poor communication with Chinese factory, but they do respond. If you could list all what is required to calculate I will try to contact them, it may take few days though for them to answer.
Thanks.