synchronisation problem when using M3 command

If you are using Axis does the graphical preview appear correct?

Is it always the Y axis that has the problem?

If this is a 4-axis board you could switch the Y axis to the 4th channel and see if that helps (you just need to alter the parallel port pin numbers in the HAL file)

devlies wrote:

But still when M3 S1 is used the Y axis seems correct and when M3 S1000 is used the Y seems to fail ? It feels like the linux or the computer has calculation problems with high M3 S values. But still trying and thanks a lot.....

This is easy to test, change the pwmgen.0.scale value so that S1 = full speed. Then I suspect that you will see exactly the same effect at S1 as you see now at S1000.

I am convinced that if there was an interaction between spindle speed and the Y-axis in the software that it would have been noticed by now...