Hi there!
I am very new here, but not only in EMC, also in English and CNC!
I have built an axis which is 400mm length, driven by trapezoid leadscrew 14x4mm, 1Nm stepper motor and an industrial motor driver. I have plastic nut (zero play), but if I say to EMC jog 1mm or 5mm or 10mm every travel shorter than cca. 0.025 - 0.050mm.
I thought that, maybe the pitch of the leadscrew less than 4mm, but than there have to be more difference after a few turns.
I know, tha 10mm is only two and a half turn, but the leadscrew pitch difference has to be added together, so if after 1mm there is 0.025, than after 2,5 turns the difference is 0,025 but not, it is still 0,0025.
It is like I have a nut which plays a bit on start and stop, but my one is not!