I'm going to try and CNC my LC-30A mill on the cheap. My thoughts at this point are: Use NEMA 34 stepper motors (about 500-900 oz-in) Make suitable brackets etc to mate motors Scales TBD (optical or magnetic?) Stepper driver: Gecko or similar Unknown interface between scales and PC? PC (running Windows and TBD software) CNC feedback will be based on scales not stepper pulses or rotary encoder data, to null effects from ACME screw backlash. The software should display X,Y,Z data, when using the machine manually Goal is to have tolerances of about 1 mil in aluminium (plenty close enough for what I do) Something like this: Does this seem like a sensible approach? What low cost (or open source) PC based CNC software would you guys/gals recommend? Suggestions for interface between scales and PC? Thanks in advance for your ideas and suggestions.