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 37
he pitch of the lead screw may be (unless it is frac-tional), but in order to close the nut after moving J inch, the screwmust have some even number of threads per inch. As will be seen by referring to the table, a lead screw with anyeven number of threads per inch is used in a number of cases,… … Fig. 6. — Face-Plate for Multiple Thread Cutting FACE-PLATE FOR MULTIPLE THREAD CUTTING Fig. 6 shows a face-plate fixture used on various numbers ofthreads. On an ordinary driving plate is fitted a plate having, asshown, twelve holes enabling one to get two, three, four or six leadsif required.…
Machine-shop practice
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