Re: Jaw Motion with Servo?

On 28 Dec 2005 21:31:31 -0800, "redbrickhat"
<redbrickhat@xxxxxxxxxxx> 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.

Try putting an arm on the jaw axis similar to the servo arm and
connect them with something like a large paperclip that has been
straightned out. The below is not a robltic thing, but you might
get the idea of connecting a servo to another arm.

http://www.geocities.com/zoomkat/t-stat.htm

.

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