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 273
should be-forged square, and should, when centre-drilled, have a deep countersink. The cutting endmust be turned true and smooth, being quite parallel, if to be used for parallel holes, and of the desiredtaper for taper holes. For parallel holes all the cutting is performed by the end face A ; but…
Mechanical engineering -- Dictionaries
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