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?
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