I recently bought a king pdm 30 mill from a guy in town here and am looking to convert it to cnc. I have cnc experience at the shop I work at but I would like to have this unit at home to do small projects. I have looked at lot into stepper drivers and BOBs. I am looking at an mx3660 but don't know exactly what servos I should be running. also I do not have a serial port of this computer, are there more options as for USB. I have a good handle on making the ball scew conversion. Its just the electronics side that has me asking a lot of questions. open to any suggestions.