|Pinned Joints - Course: Techniques of Fitting and Assembling Component Parts to Produce Simple Units. Trainees' Handbook of Lessons|
Pinned joints are positive joints. The pin engages a snugly fitting pre-worked bore hole. It is kept in place by the friction that is generated between the walls of the bore hole and the pin.
External forces, if any, that act on the component parts of a joint will be transmitted from the wall of the bore hole to the surface of the pin. The pin is exposed to shearing stress by the parts of the joint. When the force is too strong, the pin will shear off just where the parts are joined.
1 friction, 2 shearing, 3 external forces
Identify stresses to which pins in joints are