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Topic Date User

Cam failure discussion 24-Apr-2015 At 2:06:23 PM patto

Message

On 24/04/2015 Macciza wrote:
>Hmm, lets see
>Standard Cam Parallel - T= 4.R.sin(alpha) Alpha is cam angle
>Standard Cam Flared - T= 4.R.sin(alpha-beta) Beta is flare angle.
>Clearly it relies on beta - as beta approaches alpha then it becomes sin(0)
>which is 0

You are using the wrong equation. Plus you are reversing the dependent variables of the equations in a fashion that makes no sense. (T, tension applied to cam is an independent variable) The equation for reaction force is R=f(T,β,α) as given. ie the equation is telling you the reaction force as dependent of tension, flare and cam angle.

The hold or no hold friction circumstance is given by {tan(α) < μ} in both cases!