West Coast Drive: Output "shifting" shaft

[PAR_WIG1350]

Originally Posted by Adam.garcia

Since I'm just entering into Mechanical Engineering as an Undergraduate next year at UCLA, I am unfamiliar with the engineering principles and guiding formulas to test shear stress applied at certain conditions, and the shear stress that a screw (I'm thinking #4-40) will withstand before succumbing to failure.

Can anybody please enlighten me, or is this not worth calculating?

screws don't like shear, also, 4-40 is rather small, the amount of shear force the cylinder would apply would be equal to the force the cylinder applies (as in all of the load applied to the screw by the cylinder are shear forces) so that would be (one half of the bore) squared times pi times the system gauge pressure

there may be some additional forces on the screw from the transmission itself, but the shaft should take most of this so it should be negligible.

NOTE: I believe in 2010 AM tried using screws in their shifters and found that they broke a lot more often then pins did.