I finally managed to finish the CNC conversion of the HBM BF-25 machine ! (Ooh well, still some homing-switches and emergency-buttons to wire, and my 4th axis, but everything comes along fine now) After some calculations about motor steps per revolution, and movement in millimeter of the spindles per rotation, I got the machine calibrated !
Click here to see a movie of the calibrated X-axis
Click here to see a movie of the calibrated Y-axis
Click here to see a movie of the calibrated Z-axis