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Thread: Dual-threaded rod - GIF

  1. #1
    Jon
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    Dual-threaded rod - GIF

    Dual-threaded rod. Probably not the most practical fastener, and conveniently featured here between both a business and religious advertisement.




    Previously:

    Complex threaded loose nut piece machined from a single part - photo
    80 threads per inch fastener close-up - photo
    Cutting threads with a milling machine - GIF
    Thread rolling cylindrical dies - GIF
    Glass thread forming machine - GIF

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    trigger's Avatar
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    Friggin nice machining!

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    Supporting Member Frank S's Avatar
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    Frank S's Tools
    Quote Originally Posted by trigger View Post
    Friggin nice machining!
    Not only that did you happen to notice how many thread starts there are on the thing? it looks to be in the neighborhood of 2 to 4 TPI with possibly 16 to 20 starts in either direction
    Never try to tell me it can't be done
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    Supporting Member sossol's Avatar
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    sossol's Tools
    Quote Originally Posted by Frank S View Post
    Not only that did you happen to notice how many thread starts there are on the thing? it looks to be in the neighborhood of 2 to 4 TPI with possibly 16 to 20 starts in either direction
    It looks like the first nut made a 420* rotation and the second went a 360*, so that's <0.5 TPI? At what point do you stop calling them threads and start calling them splines?

    Neil

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    Supporting Member IAMSatisfied's Avatar
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    Quote Originally Posted by sossol View Post
    At what point do you stop calling them threads and start calling them splines?

    Neil
    Or you could call it deep, precision knurling...

  7. #6
    Supporting Member Frank S's Avatar
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    Frank S's Tools
    Quote Originally Posted by sossol View Post
    It looks like the first nut made a 420* rotation and the second went a 360*, so that's <0.5 TPI? At what point do you stop calling them threads and start calling them splines?

    Neil
    Well they would never become splines as splines are generally parallel to the length. so I guess they would be teeth instead of threads as in the teeth of a worm gear but with as many starts as there are on that thing it is probably safe to say no worm gear would ever have that many teeth. Maybe those of the Gleeson Torsion helical pinion gears might come close. I have seen some right angle drives using gears cut with 10 to 12 teeth in a spiral called spiral helix
    SO essentially what the bolt has is a spiral helix thread cut with left and right rotation.
    What ever it is the thing is amazing
    Never try to tell me it can't be done
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  8. #7
    Supporting Member Frank S's Avatar
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    Frank S's Tools
    Quote Originally Posted by IAMSatisfied View Post
    Or you could call it deep, precision knurling...
    Does look like knurling doesn't it
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  9. #8
    Supporting Member hemmjo's Avatar
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    hemmjo's Tools
    Makes me want to run down stairs and try it, but I don't have a at least a week to devote to it. Sure would be a test of skills!!!

    I am with Frank, 16-20 starts in EACH direction.

    Dual-threaded rod - GIF-trick-bolt.png

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    Quote Originally Posted by trigger View Post
    Friggin nice machining!
    Look at the bottom end of the threads, I'd bet it was done on a CNC due to the thread tool pull out.
    That, or a really fast and skilled machinist.


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