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 763
t six full threads at the other end of the tap. By this means, there being no clear-ance in the thread, the tap will work very steadily, and will tap a hole in which the tap itself willbe a neat fit, while all the holes tapped will be of exactly one size. By giving the tap a long taperit will work… … than one-quarter of its length. The plug-tap should be made in like manner, and tapered off forabout four threads from the end. A very good plan of easing the friction of the tap is to tile a flatplace along the tops of the teeth, extending along each tooth nearly to the edges. On taps for…
Mechanical engineering -- Dictionaries
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