now it works and i feel really embarassed to tell the mistake. i used port 13 pin number 1

, just switched the colums. i still had the order from motor outputs in mind, first the pins, then the port.
so anyway, thanks all for your help, now it is working perfect and my mill is complete. it is a 330kg artec zx45 mill, which i bought partely converted to cnc. yesterday evening i made my first steel chips

michael