8x4 Build based on plans by Joescnc Hybrid R&P

[GrahamWhite]

So this is the progress so far

The Y axis to X are not finished yet, still have more support for the gantry to be fitted.
The plans called for ACME lead screw on the Z but after hunting for the elusive 1/2"-8 2 start bar across the planet, I gave up and bought a ball screw 16mm 05 lead off of ebay with the mounts and coupler.
I'm hoping they are similar - the acme was a 1/4" lead per turn where as the ball screw is 5mm - not sure how that will affect the Z performance at all?
I will be running the 4Nm 23 motors at 68-70vdc as Jazzcnc suggested so there should be enough extra oomph I hope to compensate for the Z?
Now onto a redesign of my Z to allow for the ball screw mounts