Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 764
VYvViWraftVA-KAVV-- … both in section. The step C holds the tan to its work, and it is obvious that, as the tooth B enters,it will cut the thread to its own diameter, the rest of the teeth on that step merely following friction-less until the front tooth on the next step takes hold. Thus, to sharpen the tap equal to…
Mechanical engineering -- Dictionaries
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