Another Worm Gear (Globoid 120:1)
thingiverse
Yet another worm gear which happens to be throated. Also globoid, as the driven gear has a dish to it as well. One full rotation of the worm should also offset by one tooth on the driven wheel, and since there's 120 teeth, that means 120:1 reduction. I made this more with cleverness in knowing how to model in Blender rather than using math, so I'd assume there is some error. But I'd also think it's close enough that it's not anything that some 300 or finer grit sandpaper couldn't solve. So this should be a workable gear. Also I'm thinking of doing something based on this, such as a differential. Nothing too clever though.
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