top mounted ballscrew, would it work properly ?

[Rory13]

I suspect what Rory meant, was only having a single central ballscrew on the long axis, instead of twin ballscrews with one either side, not an entire machine that runs on a single ballscrew.

Yeap thats what i meant. Reason i m looking for friction coefficients for linear rails is that i d like to compare to alternative methods like some rolling bearings on the steel frame. I suppose the more diy methods would require a bigger motor to overcome the additional friction. Waggon type rails are great but their price is out of the question at the moment. Another question, is configuring different motor for each axis a harder task ? I was thinking about a nema34 for the long axis on a single ballscrew and nema23 for the rest, perhaps movement by belt on Z axis.