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Here’s a neat idea by telescope maker AstroNutRex: you can make a worm gear by bending some pieces of threaded nylon rod around a circular form. A threaded metal rod is then used as the worm. The resulting contraption probably won’t stand up to heavy loads, however the much reduced gear ratio should be perfect for making minute adjustments to the alignment of large objects such as telescopes. [thanks, David!]


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Comments

  1. Dean W. Armstrong says:

    Cool! Another interesting way some telescope makers make worm gears: they apply partially-set JB weld to the outer rim of the worm wheel, then put a nylon rod in the goo and let it set. The JB weld doesn’t stick very well to the nylon. I think I have read another way is to drive the nylon worm and worm wheel very carefully during the gooey phase and you get a perfect match between the two gears.

    1. Matt Mets says:

      Oh, awesome. I guess that is the same thing as casting, except with a moving mold? Cool stuff!

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