ok... so did more test and here are the results
- exchanged the drives and same result.
- re-done the wiring between drives and interface board (to avoid misconnection or inverted pulse)
- changed feedrate of the test program and noticed that x and y where also getting some shift at some feedrate.
- the did a test full speed (5000mm/min). result is no visible shift
- so basically the lower the steps per min are and the more drift I get.this is why at 50 microteps it was not as obvious as now.
previously with the original JNC-40 USB interface card, it was crashing a lot but at least there was no shift like now.
could it be the CSMIO interface card? if so why?
i have no more idea on what is the issue...
thanks.
renaud
as a summary of my setup:
my motor specs:
http://00353cf.netsolhost.com/motors/Stepper_Motors/Hybrid_Steppers/85_110mm/86BYGH450.pdfmy driver specs:
http://www.leadshine.com/UploadFile/Down/MA860Hm.pdfmy interface:
http://www.cs-lab.eu/en/upload/pdf/User_Manual_CSMIOIPM_EN_rev1_2.pdf