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		Pinned Joints - Course: Techniques of fitting and assembling component parts to produce simple units. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 17 p.)
			(introduction...)
			Preliminary Remarks
			Hints on Labour Safety
			1. The Purpose of Pinned Joints
			2. Types of Pins
			3. Types of Pinned Joints
			4. Stresses in Pinned Joints
			5. Tools and Auxiliary Accessories
			6. The Technological Steps of Making Pinned Joints
			7. Undoing Pinned Joints

4. Stresses in Pinned Joints

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.

Figure 14 Stresses in Pinned Joints

1 friction, 2 shearing, 3 external forces

Identify stresses to which pins in joints are exposed.
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