Читать книгу The Handyman's Book of Tools, Materials, and Processes Employed in Woodworking - Paul N. Hasluck - Страница 136

The advantages of a bit whose working size can be altered with ease are apparent, and there are a number of such bits on the market. Fig. 406 shows one of the simplest, Anderson’s, this being made in three sizes—5/16 in. to 9/16 in., 9/16 in. to 1 in., and 1 in. to 2 in. Fig. 407 shows Steers’, this being made in three sizes, 5/8 in. to 1 3/4 in., 7/8 in. to 3 in., and 7/8 in. to 4 in., whilst extra cutters for other sizes can be obtained. Clark’s patent bit (Fig. 408) is made in four sizes, 1/2 in. to 1 1/2 in., and 7/8 in. to 3 in., 4 in., and 5 in. respectively. Anderson’s is a cheap bit, the two others being somewhat expensive, though only in first cost, and being thoroughly reliable they obviate the need of a great number of separate bits.

Fig. 405.—Method of Obtaining Accurate Horizontal Boring.