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  1. wagnergear

    Boston Gear - why helix angle changes and the pitch diameter doesn't?

    For a 12DP worm and wheel. 1 thread worm / mating gear 4.766 degree, 60T 5.000 PD 2 thread worm / mating gear 9.466 degree, 60t 5.000 PD 4 thread worm / mating gear 18.433 degree, 60T 5.000 PD. Thanks for the help
  2. wagnergear

    Boston Gear - why helix angle changes and the pitch diameter doesn't?

    Sorry, I was talking about the worm wheel,
  3. wagnergear

    Boston Gear - why helix angle changes and the pitch diameter doesn't?

    In the Boston gear Catalog, in the worms and worm gears section, they have single, double and four threads. All with the same pitch diameter but very different helix angles. Doesn't the helix angle change the P.D.? Thanks

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