After spending a few months reading and studying... I have finally advanced to the level of "I know what I don't know"... maybe.

I've watched all the videos of the MK4 and think the dual box design gantry may serve my purpose. Here's the pie in the sky.

A multipurpose machine, mill, drill and plasma. Forget the plasma part for this discussion. I would like to bore mild steel 10 - 15 mm plate. I figure I'd probably have to change out the z axis spindle depending on the operation, a lot of details would need to be looked at there but now my question?

Could a dual box design like routercnc MK4 generate the forces needed to drill a steel plate using an annular bit? Holes would be 10 to 20 mm. I've got a need to drill large plates 1200 x 1200 mm.

Further spec's on the machine would be, milling plastic, aluminum, and wood.

Any help on threads, builders etc... would be appreciated.

BTW kudos on the MK4 that is some impressive work.