American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 235
ust 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 small as possible is thestrain… … is illustrated in Figs. 3, 4 and 5, where all thecutting edges are 60°. In Figs. 3 and 4 theangle of relief is 3° ; the shaving will con-sequently be wedged off at an angle (E d B,Fig. 3) of 63°, which is the smallest possibleangle. In Fig. 5, where the tool is also 60°,but where the angle of…
Clocks and watches
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