Here is what I have...
I still have a few parts to place on the Z axis, but I believe I have drawn all the parts I need to cut.
I will be using my old flimzy CNC to cut the aluminum parts and drill the holes in the Steel tubes.
I am considering either this 3/4 X 0.5 high lead acme srew, or this 5/8 X 0.2 ballscrew , both from Roton. Considering the advantages of ballscrew, the 5/8 ballscrew option seems attractive, but at over 42 inches, I am worried the ballscrew might whip at higher speeds. I hope to get rapids of over 300 IPM.
With the acme screw being thicker and having a higher lead, I am leaning towards the acme screw with the threaded mount nut. The thicker ballscrews are out of my price range.
Any input here is appreciated.