I'm new to CNC and still getting to grips with converting an old NC machine to run on Mach3 (well, that's what I'm using at present).

Just when I think I know what various boards and components are for I find that I have a gap in my knowledge which I can't get my head round.

My machine seems to work fine with an old PC and a BOB. So what advantage is there to using a motion controller board? What does it do that a BOB won't do?

David