I hope I don't cause a disturbance in the flow by asking an "on topic" question!
When would a sub-spindle be needed? Can it also be used as a tailstock?
What is the C axis? I'm guessing it's the rotational positioning of the sub-spindle or is it the live tooling axis?
Can a radial thread be put in with live tooling? I'm thinking it would require an encoder on the tooling drive. Machine dependent?
Thanks, Dave