Re: Jaw Motion with Servo?

The tendons across the back of your hand (driven by
muscles in your fore-arm) only tug, but your fingers
rotate.

On the old railways, a taught wire actuated the
rotation of semaphore signals.

'nuff said?

redbrickhat wrote:
> I'm trying to rotate the jaw of a plastic model open and closed using
> an RC servo and connecting rod.
>
> My question: since the axis of rotation of both the jaw and the servo
> arm are not aligned, is it possible to create a motion such that when
> the servo arm rotates, the jaw also smoothly rotates around its own
> axis?
>
> Can I create such a motion by using just a single rod connected to a
> ball link on the jaw and to a ball link on the servo arm?
>
> It seems to me that when the RC servo arm rotates, it can only create a
> linear tugging motion with respect to the jaw, not a rotating motion
> around the jaw axis.
>
> I don't know much about the physics of mechanisms yet, or how to design
> such things as cranks or cams, so any feedback will be appreciated.
>
> Thank you.

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