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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

7. Undoing Pinned Joints

Pins in through holes can be driven out by several blows onto a drift (of a nominal diameter somewhat smaller than that of the pin). Apply the blows in the opposite direction of driving in the pin. Make sure that there is a larger hole in the support through which the pin can slip.

Figure 24 Undoing a pinned joint with a drift

Pins that are flush with the surface of the workpiece and have seized up or pins in blind bores must be removed by drilling. Use a drill of the nominal diameter of the pin.

Figure 25 Removing pins with a drill

To remove grooved drive studs, apply a flat chisel sideways between the head of the grooved drive stud and the surface of the component part, and by a few hammer blows, lift the drive stud and remove it with a pair of tongs.

Figure 26 Undoing a grooved drive stud joint

When you remove pins from joints, make sure always to place the joint on a pad or other support that will not slip.

How can you remove a pin from a through hole?