Spring tension pins

These pins are made from spring steel wrapped round to form a slotted tube. Fig. 12.6. The outside diameter is produced larger than the standard-size drilled hole into which it is to be inserted. When inserted in the hole, the spring tension ensures that the pin remains securely in position and caimot work loose. A chamfer at each end of the pin enables it to be easily inserted in the hole, where it can be driven home using a hammer. 

In many applications, it will be useful to describe the nanomeniscus as an equivalent mechanical oscillator and thus to derive a meniscus spring constant. Here, we propose to determine this value in the simple case of a CL pinned on a fiber dipped in a liquid bath. Since the pressure inside the meniscus is zero, the capillary force is simply given by the tension term ... 

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