m_c: Part of the problem with the old controller, and part of the reason for its demise was the lack of a controllable input - other than through push-button control. I intimated a 0-10/CW/CCW control, but that's a generic wiring for two mills controlled by the single controller - so I'm looking to break commonality and have different solutions for the Starmill (Ana/switched) and the Sieg (Step/Dir). Back of my mind I'm thinking that this might open up rigid tapping vs analogue control (although I think there's an encoder output on the servo controller, also. Either way, Jazz and m_c, thanks, you're giving me confidence in pursuing this (it's also an eye opener to the performance of servos vs steppers)