what Spur Gear to Match Worm ??
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  1. #1
    C.M. Guest

    Default what Spur Gear to Match Worm ??

    Greetings. I have a 3/8 inch worm with 16 TPI. It's a multistart too but don't see that being an issue to my question. What matching spur gear should i be ordering to mesh with this worm ? Thanks in advance for your time in responding.

  2. #2
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    Spur gears, having straight teeth, do not mesh with worms, especially muti start worms. The simple reason for this is the worm teeth are on a helix angle which increases in angle for more than a single start.

    If it is two start and appears to be 16 TPI, it is really 8TPI lead. Could also be metric.

    The nearest diametral pitch (tooth size) to have teeth that would fit in 16 TPI would be 50.265 DP, a non standard size tooth.

    John Oder

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    Take it to the local specialist shop (Motion Industries ? McMaster Carr? Grainger?), toss it on the counter and ask them to suggest a proper gear to give you the desired ratio.

    You can specify a bore, or an unfinished hub.

    Might as well have your shopping list ready, as to couplings, shafting, sprockets, etc.

  4. #4
    C.M. Guest

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    OK thanks guys. After some research of my own, I've decided it would be nuts to pursue this. I'm far better off finding a matching set.

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    If you get stuck, I may be able to hob you a worm and wheel to match.
    Peter


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