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 35
. The front edge of thethread tool is used to determine the angle of side clearance. Fig. 4shows a section taken along the line a b, Fig. 2. It will be noticedthat line e f is shorter than G H to give clearance to the cuttingedges of the thread tool, and also that G R is equal to H R and e Sis… … TIG. 2
Machine-shop practice
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