I have been thinking about designing a 5 axis CNC router and I was wondering about designing an AB head rather than the standard AC head. I know, designing any CNC machine is a whole can of worms and it's far more likely that nothing sees the light of day than a machine gets finished, BUT, I do have a question.

Does anyone have links to images or videos of a purely AB CNC machine in operation? One that does not use a C axis at all (i.e. no rotation about the Z axis).
Would Mach4 be able to operate such a setup? I'd imagine an AC setup is more common.

Thanks for any input,

Malachi