Parametric Worm Wheel for Threaded rod

thingiverse

The source thing was based on a ball screw, which was the wrong profile for me. I wanted a worm wheel that I could use with a small threaded rod. I changed the profile of the worm gear and tweaked it so that it was shaped for standard threaded rod. Instructions Note that the defaults currently in the scad file took me 6 hours to render into an STL, and then I used a separate step (to be uploaded later) to cut out some holes to keep it light and save plastic and printing time. Although I think the threads should be deeper, the first print actually came out very well and meshed with the threaded rod (SAE #10-24) that I had selected to make a 400:1 speed reduction.