[origamimavin]

I picked up the KL23H276-30-8A steppers. They may not as much torque, but from some of the back and forth here, they seem to be a solid option.

I'll check into the HTD series belts. I saw the XL belts are good up to 1/4 hp, and that's pretty much where my machine would be. Having something that can handle more would certainly be more ideal.

I went with acme rods mostly because of cost, but also because I couldn't find ball screws for a reasonable price that would match my linear movements. Hopefully they'll at least get my started, and I can upgrade them later in the future if I need to. The project has also scaled up a bit from my initial expectations of when I started this project and began buying parts. Sometimes I just need to step back and remember that this is my 1st CNC build and is still a learning process. I built a 3D printer about 4 years ago, so I thought I'd be ready for a build like this, but didn't realize all the nuances and how everything works together. I've really learned a lot.

But now that I have the 282 oz/in motors with the 10tpi acme screws, what would the most ideal gear ratio (if gearing is used) to drive it? I don't want to do direct drive inline because it'll make the motors stick out the back and sides too far. Also, how much current will I need the 48v psu to be to drive these 4 motors?

Attached are images of what I'm planning the machine to look like. I still need to upgrade the 3D model from the nema 17's to 23's, but most else is there.

Attachment 275396

[ger21]

I'd try a 2:1 reduction on all axis.

[origamimavin]

I'd try a 2:1 reduction on all axis.

Even on the Z?

[ger21]

Yes. Small pulleys are cheap, you can try some different ratios and see what works best.

If you don't have the screws yet, you'd be better off going with a .2 or .25 lead, which will be much more efficient than the single start screws. You'd gear these 1:1, and get the same effect as the 1:2 gearing with the single start screws, but have more power due to better efficiency.
3/8 X .200 Right Hand Hi-Lead Lead Screws & Nuts for Power Transmission - Roton Products, Inc.
3/8 X .250 Right Hand Hi-Lead Lead Screws & Nuts for Power Transmission - Roton Products, Inc.
3/8 X .375 Right Hand Hi-Lead Lead Screws & Nuts for Power Transmission - Roton Products, Inc.

[H500]

I am using the 282s on all 3 axes of my sx3 mill. Direct drive on x and y, 2-1 reduction on the 115lb z axis.