Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 173
et, Fig. 514, is made with a conical shaft, around which is filed a half-round groove, the one edge ofwhich becomes thereby sharpened, so as gradually to enlarge the hole after the first penetration of theworm, which, from being smaller than in the common gimlet, acts with less risk of splitting.… … BORING TOOLS. 171 gradually drawn iuto the work, as iu the gimlet, and the two angles or lips are sharpened to cut at theextreme ends, and a little up the sides also. The same kind of shaft is sometimes made as in Fig. 516, with a plain conical point, with two scoringcutters and two chisel edges,…
Mechanical engineering · Mechanics · Engineering
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