Thanks for replying folks. Yes I had a problem with the internal puls generator and deactivated it. The motors ran much smoother, but still there was something, and you'll never guess what. In the heat of things I had forgotten something so stupid that I can't believe it's possible. I forgot to grease the threads for the axis. Can you belive it!! I had oiled everything else but the treads. I was so focused on the correct coil windings and the parameters in the TurboCNC that I forgot the basics. I'm learning the hard way
