If you are thinking of converting a BP, Nook industries sell a rolled ball screw conversion for these mills. I have a couple of Excello's (same size as BP) and they use S.E.M. Motors (UK). 26inch/lb 2 to 1 belt reduction. Then you will want to also put a ball screw on the Z. (see the conversion done by IJ Australia) in this forum. Personally I would not convert the knee to CNC other than maybe motorize it for manually moving. You should not need three phase if you put a VFD on the spindle, you get Sph in 3ph out for the spindle motor, I converted mine from the vari-speed pulley to fixed ratio with VFD. and control the spindle from the CNC controller. I used Acroloop Acromill 4 axis card which gives 3 axis and Handwheel. The other way is to look for a small CNC mill that need a retrofit.
Al
__________________
CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E. |