Question for a engineer

[Josh_K]

O.K. here is an engineering question for a real engineer.

The part is an inverted "U" or "C" shaped rocker for a Ford crossover steering that I am making. The tubing that is taking all the torsion twist force is a 4130 1.75" o.d. .500" wall.

Now, most every one know that a tube is stronger that a solid bar. But my exact question is at what point does the wall get to thin or thick and when does strength become a loss.

Another way of asking this is; what is the optimum wall thickness?

Tosional forces only affect this part and the center I.D. is 1".

Thanks

Josh

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