Dual screws for large router tables

I really wonder why so many people think dual drive screws are
necessary for those large tables. With a properly designed system
only one screw would be required for any system.

I'd put the x and Y screws right on the centers of the machine...no
matter what size the table was. What I'd do to prevent twisting
would be to mount a set of guide bars along the sides of the frame
for the long axis and a set of guide bars close to the router
mounting for the X axis. If Z movement were required, I'd do
something similar for it as well.

I'd support all the guide bars well enough so I wouldn't need to
worry about flex in the middle causing an unwanted change in the Z
depth.

A system built that way could be built just about any size you wanted.

BTW The inletting/copy machine I'm building is designed that way.

Smoke