American machinists' handbook and dictionary of shop terms : a reference book of machine shop and drawing room data, methods and definitions (1914)
Colvin, Fred H. (Fred Herbert), 1867-1965, Stanley, Frank A. (Frank Arthur), b. 1874 · New York : McGraw-Hill book company ; London : Hill · leaf 80
ing-off behind the cuttingedge, twist-drills have longitudinal clearance by decreasing the diam-eter from the point toward the shank, varying from .00025 to .0015per inch of length. This prevents binding and is essential in accuratedrilling. To increase the strength the web is increased gradually… … PIG. I FIG. 2 FIG. 3 Grooves of Twist Drills The shape of the groove affects the power and the shape of thechip and experiments by the Cleveland Twist-Drill Company areinteresting. The groove in Fig. i does not give a good cutting edge,especially near the center, as it does not allow a full curl to…
Machine-shop practice
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