## Mechanical design/Math rotating bars

## Mechanical design/Math rotating bars

(OP)

Hello all,

I can't find the ralation between the movement of 2 bars that go in opposite directions that I need to find for a mechanism. I need to find the distance that the bar B will travel if I pull from the hole on bar A (see image).

Thank you!

I can't find the ralation between the movement of 2 bars that go in opposite directions that I need to find for a mechanism. I need to find the distance that the bar B will travel if I pull from the hole on bar A (see image).

Thank you!

## RE: Mechanical design/Math rotating bars

This is simple geometry.

You are actually interested in the movement of the hole in the end of "B" aren't you?

= = = = = = = = = = = = = = = = = = = =

P.E. Metallurgy, consulting work welcomed

## RE: Mechanical design/Math rotating bars

## RE: Mechanical design/Math rotating bars

## RE: Mechanical design/Math rotating bars

## RE: Mechanical design/Math rotating bars

## RE: Mechanical design/Math rotating bars

John R. Baker, P.E.(ret)Irvine, CA

Siemens PLM:

The secret of life is not finding someone to live withIt's finding someone you can't live without

## RE: Mechanical design/Math rotating bars

So, recalling that C^2 = A^2 + B^2 - 2 ABcos(theta) and you know C, you know A, you know theta you can calculate "B", the distance from the first pivot to the place along the slot the pin is. Knowing all three lenghts you can calculate all three angles; in this case the remaining 2 of which you are interested in only one.