Cast aluminium gantry router

[Jonathan]

I don't see why you would want to cast a gantry. The open back structure significantly limits stiffness.

But we're not limited to just one beam, so you could get the torsional stiffness by casting two beams in one piece. I'd go for something similar to the gantry design on my last machine:



The Y-axis rails may have to be moved and it would take a fairly big milling machine to mill the rail mounting surfaces.