Generic NEMA 23 printed axis

by PacManFan, published

Generic NEMA 23 printed axis by PacManFan Dec 8, 2012
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Hello Everyone! I made a NEMA 23 sized version of my Generic printed axis. I'm currently using this for the Z-Axis on my CNC mill. It's Rock-Solid. I use 8mm rods and LM8UU Linear bearings in the slider.


I posted the coupler I created to attach the NEMA 23 motor to the threaded rod here: http://www.thingiverse.com/thing:41003
Parts List:

  • Small section of rubber tubing to go over the threaded rod.
  • 608 skate bearing
  • 5 mm x 25mm long bolts + nuts
  • 1/4 threaded rod + matching nuts
  • 8mm or 5/16 rails,
  • 4x lm8uu linear bearings
  • anything else I forgot to mention...

Assembly should be fairly straightforward, The only tricky part I encountered was aligning the threaded rod through the nut on the underside of the slider. Make sure the indentation of the nut on the bottom section of the slider can fit the nut properly. I used a dremel-like tool to clean mine up so everything aligned properly.

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This is amazing, but I would strongly advise making the threaded rod free on one end. Otherwise, the system is mechanically over-constrained, and if the threaded rod gets bent, you're SOL when it comes to precision. Other than that, this is absolutely fabulous.

Actually, just removing the end bearing for the threaded rod would do the trick just fine.

Yea! Looks great but the .STL files don't look right and Yes? where is the NUT Holder??
This is exactly what I was looking for

The actuation nut is intended to be held in place by a ziptie, which is fairly common in 3D printed carriages.

Thanks mate!
This is going to fit perfect on my CNC mill.

Does anybody have videos from it shooting?

looks great but i can't find the stl file for the nut holder wich screws on the bottm part.tx

The top slide as uploaded uses LM6UU bearings it appears. I was able to export the STL from the SCAD file but had to also make changes to the code to fix some issues with Repetier complaining about the mesh. Basically the cutout for the rails had a problem. I've sent the code change to PacManFan in hopes he can correct those two issues... but until fixed just know that you'll need to likely do the same to get good results from a print.

Looks great. How fast linerar motion can this handle? How long does it take to go a full travel length at maximum safe speed? Looks like 8 or so inches travel distance in the picture there. Can it do a A to Z travel in 1/2 a second? 1/4? Or more like every 2?

I assume this can be adjusted based on the threaded rod.

Thanks, looks great.

Dude, you can make this go as fast as you want, but you'll be paying a pretty price for those servomotors. Steppers just can't do that kind of performance.

Like you had mentioned, it is really determined by the thread of the rod and maximum speed of the motors. I've had my 5/16 20tpi threaded rod up to 200 mm/s pretty reliably, your results may vary.