After I solved the problem with my focuser which is of friction construction I got a new problem. When I increased the friction force to get rid of the slip of the focuser the load on the stepper motor got to high. I need a new stepper motor with higher torque. I have not solved that yet.
But under meantime I have updated my gear box calculator how to optimize the ratio to it:
http://www.astrofriend.eu/astronomy/...box-ratio.html
I did a massive rewritten of the code, hope I got everything correct now.
/Lars