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close this bookPinned Joints - Course: Techniques of Fitting and Assembling Component Parts to Produce Simple Units. Trainees' Handbook of Lessons
View the document(introduction...)
View the documentPreliminary Remarks
View the documentHints on Labour Safety
View the document1. The Purpose of Pinned Joints
View the document2. Types of Pins
View the document3. Types of Pinned Joints
View the document4. Stresses in Pinned Joints
View the document5. Tools and Auxiliary Accessories
View the document6. The Technological Steps of Making Pinned Joints
View the document7. 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.