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(Solved): The bell-crank lever shown is used to change the direction and magnitude of a force. The pin at B h ...
The bell-crank lever shown is used to change the direction and magnitude of a force. The pin at has a diameter of in., and the pins at and have diameters of ksi in the link , and the ultimate shear stress is in the pins. What is the allowable load if the factor of safety is 3.5 ?
Expert Answer
Use ABC as a free body At point B moment is zero ?M_B = 0 F_(AD)*12 - P*8 = 0 F_(AD) = (2/3)*P In x direction total force balance equation ?F_x = 0 ; B_x + p = 0 B_x = -P In y direction total force balance equation ?F_y = 0 ; B_y - F_AD = 0 Res...