I just got a series 2 Bridgeport and am re-doing the controls. I only have single phase in my shop and have 3 VFD's running already and am very familiar with them. What I don't know much about is CNC control of a VFD. I want to be able to do ridgid tapping. Should I use a vector VFD that requires an encoder to operate, and put an encoder on the spindle, or can I add an encoder later and just tie it into the machine control with a standard VFD? Which one will give me more options? I'm leaning towards the vector/encoder VFD type, like this one.
http://cgi.ebay.com/7-5-HP-230V-VECT...d=p3286.c0.m14
I would appreciate you guys thoughts on this.