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 279
ood average number of teeth on taps forUnited States standard threads is given in the following table. With Outside Dia. No. of Flutes Width of Land A 4 6^ i 4 tV t\ 4 f 4 J^ T^ 4 i-i ^ 4 i f 4 h f 4 i 4 3V I 4 i li 4 A too few teeth and too short land very little support is afforded andthis may… … FORMING TOOLS 251 FORMING TOOLS The two types of forming cutters commonly used in the screwmachine are shown in Figs. 5 and 6. The circular forming cutter inFig. 5 is usually cut away from J to -^^ inch below center to givesuitable cutting clearance and the center of the tool post on whichit is…
Machine-shop practice
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