I have been puzzling over the issue of alignment/squaring of a gantry router (though originally I came up with the idea for a lathe), and had the following idea. Instead of precisely truing the physical frame, why not calibrate the XYZ system, using feedback, so it can simply compensate for any out-of-square conditions? This way one could concentrate on strength and rigidity/stability of the router, and allow for adjustment in software. Any thoughts?
John