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Thread: "Impossible" screw - video

  1. #1
    Jon
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    "Impossible" screw - video

    "Impossible" screw. Bonus points for using a carrot to demonstrate how the trick works!

    4:26 video:



    Previously:

    MagRevolver magazine screw holder Kickstarter - photos
    Correct way to drive a screw - GIF
    1871 automatic screw-making machine - video and photo

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  2. The Following 14 Users Say Thank You to Jon For This Useful Post:

    aphilipmarcou (Dec 29, 2018), brianp (Jul 17, 2020), Corm (Dec 30, 2018), Frank S (Dec 24, 2018), hegefer (Dec 24, 2018), LMMasterMariner (Dec 25, 2018), MIGuy (Dec 29, 2018), ranald (Dec 29, 2018), rlm98253 (Dec 24, 2018), Seedtick (Dec 24, 2018), thehomeengineer (Dec 29, 2019), Toolmaker51 (Dec 28, 2018), Tule (Dec 25, 2018), UncleBob (Dec 25, 2018)

  3. #2

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    Wow! Brilliant!

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    Supporting Member CharlesWaugh's Avatar
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    CharlesWaugh's Tools
    I just made one with an angle grinder and a file.
    Works great!
    I can't wait to amaze my friends and confound my enemies tomorrow. (except... I don't have any enemies to confound)
    Charles Waugh
    www.charleswaugh.com
    "Any tool is just a kit, to be modified as needed for the job at hand"

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    Supporting Member Bony's Avatar
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    Mmm I must be trying too hard, had 3 attempts very carefully using exact specs, collets and rotary table on a milling machine. It wants to work, but doesn't quite. Maybe I should just use an angle grinder and file.

    One more try before I give up.

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    Supporting Member CharlesWaugh's Avatar
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    CharlesWaugh's Tools
    Confession:
    MIne worked great about ten times with a couple of different people (quite confounding for them and deeply gratifying for me!)

    Then, it crapped out!

    It would lock up on one end but not the other.

    Red face, grumpy show-off, etc. ensued.

    :-)
    Charles Waugh
    www.charleswaugh.com
    "Any tool is just a kit, to be modified as needed for the job at hand"

  7. #6
    Supporting Member Bony's Avatar
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    Same here, I think the locking works fine for a few times then the threads wear enough for them to engage again, which is exactly what I found. Annoying as I haven't had the gratitude yet.

    Did you use M5 thread? I tried M101.25 then M50.8 twice, with the same result. Maybe a courser pitch may prevent engagement for longer. I silver soldered some knurled brass knobs on each end of the threaded rod so that the join between them was unable to be seen even if the nut was screwed to either end.

    Looked great but simply allowed more force to be applied to the threads so they locked even fewer times before engaging again. Grrrrrr.

    Tony

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    Supporting Member ranald's Avatar
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    Quote Originally Posted by Bony View Post
    Same here, I think the locking works fine for a few times then the threads wear enough for them to engage again, which is exactly what I found. Annoying as I haven't had the gratitude yet.

    Did you use M5 thread? I tried M101.25 then M50.8 twice, with the same result. Maybe a courser pitch may prevent engagement for longer. I silver soldered some knurled brass knobs on each end of the threaded rod so that the join between them was unable to be seen even if the nut was screwed to either end.

    Looked great but simply allowed more force to be applied to the threads so they locked even fewer times before engaging again. Grrrrrr.

    Tony
    OK . It was a turn ip for the carrot. I must try when back home.

  9. The Following User Says Thank You to ranald For This Useful Post:

    aphilipmarcou (Dec 29, 2018)

  10. #8
    Supporting Member aphilipmarcou's Avatar
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    Very cunning..... I am trying to think of a practical use (on some machine etc) other than confusing friends....

  11. #9
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    They're kinda spendy, but Lee Valley tools sells one in one of these sets:
    Trick Bolts - Lee Valley Tools



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