[Texasbowhunter]

I am building a CNC and am up to the gantry and have it fabricated...One thing I was aware of at time I fab'ed it was the way it was to be fabricated...I have secured 2 each 3 x 2-.188 wall steel rectangular tubes 53 " long together to create a 4x3 tube assembly...This thing is solid/heavy...The weight of the steel only is 50lbs a bit more than I expected...I kind of guessed at the weight before i looked it up per foot as going to be about 35-40lbs...Even so I probably would have done it anyway ...
So, I guess what I'm asking is this out of realm? There will be 2 ea. Nema 24 motors powering this gantry.
Nema 24 stepper CNC motor with a step angle of 1.8degrees and a size of 60x60x100mm. It has 4 wires, draws 4.2A per phase and has a holding torque of 4.2Nm(594.77oz.in).

Thanks for any InSite you may lend
Paul

[pippin88]

What ball screws? Rotational inertia has as much impact (for smaller screws) or more impact (for larger screws 25mm and above) than weight of the moving parts.

Basically most people worry about weight of moving parts too much

Build you machine stiff and proper. Motors will be fine. If not, motors are easy to upgrade.

[Texasbowhunter]

Thanks Pippin for the vote of confidence!
The Ball Screw size are the SFU2010 working in conjunction with the HGW20CC Rails and Carriages...X2 of course or at least in this design and build...
Paul