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The Mandrel

A piece of steel tubing (S), No. 10 gage, ¾ inch in diameter, 11½ inches long, will be required for the mandrel. Get a blacksmith, if a machine shop is not convenient, to put a fixed center (1) in one end, and a removable centering member (2) in the other end.
On this mandrel place a collar (3), held by a set screw, and alongside of it a pair of pulleys, each 1½ inches wide, one of them, being, say, 2 inches in diameter, and the other 3 inches. This mandrel is held in position by means of the posts of the frame which carry the split journal bearings. This form of bearing will make a durable lathe, free from chattering, as the bolts can be used for tightening the mandrel whenever they wear.
Fig. 244. Mandrel. Fig. 244. Mandrel.

The center point (1) is designed to rest against a metal plate (4) bolted to the wooden post, as shown in the large drawing.

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