Paper Universal Joint

Sun, 29 Aug 2010

ijustgolf pointed out that the two axis joint model was very similar to a universal joint. 

The universal joint is a mechanism used to take rotary motion round a corner. Based loosely on the two axis joint model I've put together this simple version.

I'll be making it up into a download in the next day or so.

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Comments (5)

  • Shelley Noble August 30, 2010 at 6:24 am

    Mez. More. Izing. Jaw on

    Mez. More. Izing. Jaw on floor.

  • ijustgolf August 30, 2010 at 3:36 pm

    Yes…   this is going in the

    Yes…   this is going in the right direction….    now whether the 2 mating 'rooftops' used in conjunction to transfer rotory motion around a corner would be the next piece of research.. 

    hows this for an idea…   instead of the simple one-angle mating joint, what if the joint was composed of mating 'four-point' pieces..   kinda like fingers..   this design would allow both radial and rotory motion..

    ..just an idea….


    i also wanted to properly introduce myself since i've been spending alot of time on your site..  my name is also Robert (my friends call me Gum, mostly because there are too many roberts)..  i presently work as a prepress technician/graphic engineer at a print shop here in New Jersey..  one of the products we make here at the shop is writing pads..  which uses that white padding compound used in all of your designs.. i also worked for many years as a land surveyor instrument person..   so i may be uniquely qualified in the area of paper engineering..


    i am presently in the process of designing and building my first automata…   i chose to do the Seattle Swing Bridge..   when completed, i expect this model to open close traffic gates, open and close a pair of bridge leaf lock pins, hoist and lower one of the spar towers and swing open and close the 2 bridge leaf structures…    all while rotating a single crank handle in one direction….

    is it possible i bit off more than i could chew?!?..

    keep up the GREAT work…..      Gum 

    • Deal August 30, 2010 at 4:24 pm

      I don’t know if you are

      I don't know if you are chewing too much or not, Gum. But that sounds like a lot for one automaton to do. How large a footprint will this puppy have? However large it is, I sure would like to see it working.

    • robives August 30, 2010 at 7:34 pm

      Gum, what materials are you

      Gum, what materials are you using for your automata? Don't forget to take pictures of development!

  • ijustgolf August 30, 2010 at 8:32 pm

    hi and thanx….
    just like

    hi and thanx….

    just like all of the other automata that i've built and seen, mine will use nothing more than card stock and white padding compound (Elmer's)..   one of the things i'm noticing is that this project (more than likely) will involve building parts that aren't even in the final product, just things that help me build other things..   i've tested several gear configurations, a few crank-to-crank connections all why honing in on the elusive final design..   

    i know this might sound a little stupid but..  so far, the swing bridge is set to use; cranks, rods, levers, cams, hinges, gears, bellcranks and pivot shafts..  after seeing this updated blog on the universal joint, i might even use that somewhere in the design..  i was a little ticked that i couldn't squeeze in a worm gear though (thats another mechanism that i've been toying with)…

    and yes, i was one of those people who actually put together that paper clock..  that experience alone tells me that doing multiple tasks isn't out of the question..

    rob, once i saw how you connected the two axle pieces, it all made sense..  great job!!

    as for the scale of my project, we typically use press sheets here that are 17" x 23"..   figure the leaf spans are about 8 to 10 inches each with another 3 or 4 inches of connecting roadwork on either end..   and for the sake of me not losing ALL of my hair, unlike the actual bridge, mine will be flat as a pancake, no 'hump' in the middle like the real one…     not that it could'nt be done


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