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  1. #1
    LMMasterMariner's Avatar
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    Hob for Free Hobbing of Worm Gears

    Made hob from hexagonal bar of 304 stainless steel diameter 24 mm.
    I know it's not tool steel but it will do the job in phosphorous bronze.
    First turned one part of the bar to 24.0 mm and then turned to 20.5 mm at 3 spots.
    Threaded with TR3 insert and made trapezoidal thread 24mm x TR3.
    One part of it will be used as worm and another part is a hob.
    Good thing is that this bar is hexagonal, so I could easily place it
    in 4 way toll post and turn it for 60 degrees each time for milling.
    12 mm cobalt end mill used for milling.
    No milling machine, nor rotary table on board.

    Very simple job which was completed in 3 hours.

    Will use this worm and one of worm gears (30, 32, 36, 40 teeth, still have to make them)
    and some of the gears from the last picture in one of my next projects = lathe power cross feed.

    Regards
    LMMasterMariner
    Attached Thumbnails Attached Thumbnails Hob for Free Hobbing of Worm Gears-1.jpg   Hob for Free Hobbing of Worm Gears-2.jpg   Hob for Free Hobbing of Worm Gears-3.jpg   Hob for Free Hobbing of Worm Gears-4.jpg   Hob for Free Hobbing of Worm Gears-5.jpg  

    Hob for Free Hobbing of Worm Gears-6.jpg  

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  3. #2
    LMMasterMariner's Avatar
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    The drawing
    Attached Thumbnails Attached Thumbnails Hob for Free Hobbing of Worm Gears-hob-cutting-2.jpg  

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    Paul Jones (03-15-2018), rossbotics (09-12-2017), Seedtick (09-11-2017), VegeKev (03-13-2018), yves78 (03-13-2018)

  5. #3

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    like it.thanks for sharing

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    Content Editor DIYer's Avatar
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    Thanks LMMasterMariner! We've added your Worm Gear Hob to our Machining category,
    as well as to your builder page: LMMasterMariner's Homemade Tools. Your receipt:




  7. #5
    H.L
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    Quote Originally Posted by LMMasterMariner View Post
    Made hob from hexagonal bar of 304 stainless steel diameter 24 mm.
    I know it's not tool steel but it will do the job in phosphorous bronze.
    First turned one part of the bar to 24.0 mm and then turned to 20.5 mm at 3 spots.
    Threaded with TR3 insert and made trapezoidal thread 24mm x TR3.
    One part of it will be used as worm and another part is a hob.
    Good thing is that this bar is hexagonal, so I could easily place it
    in 4 way toll post and turn it for 60 degrees each time for milling.
    12 mm cobalt end mill used for milling.
    No milling machine, nor rotary table on board.

    Very simple job which was completed in 3 hours.

    Will use this worm and one of worm gears (30, 32, 36, 40 teeth, still have to make them)
    and some of the gears from the last picture in one of my next projects = lathe power cross feed.

    Regards
    LMMasterMariner
    Muito boa ideia...


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