Rotation of axis in Mach3
http://www.mycncuk.com/forums/showthread.php/3896-Using-a-webcam-to-align-pcb-registration-marks-%28for-cutting-pcb-outlines%29/page2
: stay hungry, stay foolish :
http://www.mycncuk.com/forums/showthread.php/3896-Using-a-webcam-to-align-pcb-registration-marks-%28for-cutting-pcb-outlines%29/page2