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

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    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?
     
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  3. spidergoat Speak of the Devil Valued Senior Member

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  5. Syne Sine qua non Valued Senior Member

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    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.
     
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  7. Syne Sine qua non Valued Senior Member

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    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

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  9. Syne Sine qua non Valued Senior Member

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    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

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    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

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    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.
     

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