American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 234
le of thetool y ~R d D the angle of esedpe. ■■ The angle of relief should always be verysmall, because the point of the tool, d, will, inthat case, have its support nearly in a line oppo-site to the force acting upon it. This dependson the angle which the upper surface of the edgemakes with the… … is required in a cutting edge it must be obtainedfrom the upper surface, and not by increasingthe angle of relief. This is shown in Figs. 3,4 and 6, which represent tools for iron andwood, the angle oi relief being exactly the samein both cases. A most important reason forkeeping this angle as…
Clocks and watches
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