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Thread: Hobbing Worm Wheel - Need Help

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    Supporting Member LMMasterMariner's Avatar
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    Hobbing Worm Wheel - Need Help

    Need to know diameter of worm wheel for the following numbers of teeth: 30, 32, 36, 40
    for worm dia 24 mm x metric trapezoidal thread TR3

    Even have plenty round bars of phosphorus bronze in various diameters wouldn't like
    to use hit and miss approach.

    Many thanks in advance / Best regards
    LMMasterMariner

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    Seedtick (09-06-2017)

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    Supporting Member olderdan's Avatar
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    olderdan's Tools
    Quote Originally Posted by LMMasterMariner View Post
    Need to know diameter of worm wheel for the following numbers of teeth: 30, 32, 36, 40
    for worm dia 24 mm x metric trapezoidal thread TR3

    Even have plenty round bars of phosphorus bronze in various diameters wouldn't like
    to use hit and miss approach.

    Many thanks in advance / Best regards
    LMMasterMariner
    Found this in Engineers Handbook which may help.
    Hobbing Worm Wheel - Need Help-screen-shot-09-06-17-12.25-pm.png
    Not sure of your method of cutting these but if free hobbing you need to gash the teeth first.
    I think I would try a test on plastic or alloy to prove, good luck.

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    LMMasterMariner (09-06-2017), Seedtick (09-06-2017)

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    Supporting Member LMMasterMariner's Avatar
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    LMMasterMariner's Tools
    Thanks Olderdan.

    I also found some info in 'Handbook of Machining and Metalworking Calculations' and 'Machinery's Handbook 29th Edition (2012)' which I have in my pdf collection.
    Yes, my intention is to use free hobbing method.
    Already made hob from s.s. 304 24 mm dia hex rod. At the same time on the same rod made worm.
    Here is picture of that and also picture (found on the web) of what hob should be when I finish it.

    Best regards
    LMMasterMariner
    Attached Thumbnails Attached Thumbnails Hobbing Worm Wheel - Need Help-1.jpg   Hobbing Worm Wheel - Need Help-2.jpg  
    Last edited by LMMasterMariner; 09-06-2017 at 07:09 AM.

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    Seedtick (09-06-2017)

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