Simple mechanism to translate linear to rotational motion?

Discussion in 'Architecture & Engineering' started by Syne, Sep 29, 2016.

  1. Syne Sine qua non Valued Senior Member

    Messages:
    3,515
    I am looking for a simple (fewest moving parts) mechanism to translate a linear input force to a 180 degree rotation. Does a scotch yoke like mechanism provide much lever advantage, or is it really only efficient at translating rotational motion to linear?
     
  2. Google AdSense Guest Advertisement



    to hide all adverts.
  3. spidergoat pubic diorama Valued Senior Member

    Messages:
    54,036
  4. Google AdSense Guest Advertisement



    to hide all adverts.
  5. Syne Sine qua non Valued Senior Member

    Messages:
    3,515
    Nice resource, but doesn't answer my question. I know I can use a scotch yoke like mechanism, but only if the linear input force has enough lever advantage on the rotational motion.

    I plan to build a mockup to test...since I'm not finding any answers.
     
  6. Google AdSense Guest Advertisement



    to hide all adverts.
  7. Syne Sine qua non Valued Senior Member

    Messages:
    3,515
    Won't work as originally designed. It seems it only has enough lever advantage over about 45 degrees of rotation.

    Something like this might have worked:


    Except I only have from the rotation pivot up to work with for the linear engagement, instead of being able to engage all sides of the pivot.

    I also debated using a rack and pinion, but again, I'm not sure if it offers enough lever advantage.
     
    Last edited: Sep 30, 2016
  8. iceaura Valued Senior Member

    Messages:
    30,994
  9. Syne Sine qua non Valued Senior Member

    Messages:
    3,515
    Thanks for the links...maybe they will inspire other solutions.

    But yeah, too many moving parts in the first, and my pivot needs to keep a constant distance from my linear plane, so the second will not work either.

    Well...maybe if I use the pivot on the Sarrus linkage's translating member I can almost get 180 degrees.

    Thanks.
     
    Last edited: Oct 6, 2016
  10. Watcher Just another old creaker Registered Senior Member

    Messages:
    373
    Sounds like you have quite a few limits on you design space. I think we'll need your spec or requirements to be able to respond in a useful way.
     
  11. Syne Sine qua non Valued Senior Member

    Messages:
    3,515
    I've already designed a custom scotch yoke that should work. The slot just had to be sort of hockey stick shaped to provide the needed mechanical advantage.
     

Share This Page