Hi thanks for that wow 3yrs!! I only need mine to last 6 months so that gives me a positive. My whole machine is 3m long but the ball screws will be 2.6m which makes a fare difference to the critical speed
I may rethink the gantry sooner rather than later and swap out the bearings for a better option in time ... Just see how it goes
i did give sagging a fare bit of consideration when I built the table which is why I made the 2 sides as separate load baring structures in there own right and joined with supports from 25mm plyI agree though the expensive pieces I may wish to reuse
thanks for your input :)