Fig 243. Tool Rest.
A leather belt or strap (Q), 1½ inches wide, formed into a loop, as shown in the perspective view (R), serves as a means for holding the rest rigidly when the wedge is driven in.
The Tool Rest.—This is the most difficult part of the whole lathe, as it must be rigid, and so constructed that it has a revolvable motion as well as being capable of a movement to and from the material in the lathe.
Materials.—Then procure the following bolts:
| 4⅜" | bolts, | 10" | long. |
| 8⅜" | bolts, | 6" | long. |
| 20⅜" | bolts, | 5" | long. |
| 5⅜" | bolts, | 9" | long. |
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.