hi rich. I do not understand anything of this , I checked today on the set  step 400m/mi  my Machine on Y and X axis , machine can not overcome on two axes at a distance 76.2mm 3 " loses on 2 axes  0.31mm ,my question.?  if  I cut the same parts Y-axis cut me  ok  hole ok  bath the  X axis is  long over 0.25 i. After all, on two axes does not overcome the distance 76.2mm, and is the same difference 0.31mm.I'm already stupid, I do not know what I think

OK have you double checked the Pulse wideth and Polarity settings, the G540 HAS a spec on that as well.

NOW back to the real question. IF you repeat the test move 10  times in a row will it repeat itself EACH time without error ( move the same exact distance)

(;-) TP

I've done it already and it is the same, practically nothing has changed  with  the  2  axis  Y and X the  same  error  0.31mm   on distance 76.2 the machine  only moves 75.89mm

more and more I'm convinced! gecko 540 can not be set  perfect!  I called today to MACH3, I said all , that guy had nothing more to say

OK , IF the machine will repeat itself exactly each test I can NOT see where it is a PC or drive problem or noise problem.

IF all the data is correct AND it shows a progressive error with distance travelled  that ONLY leaves one area that can be wrong.

Ray had the idea early on with the distance testing.

(;-) TP

ok of course I will try to see what will be. Thank you for your help