American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 235
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… … the angle of wedging off, D d B, is increased to90°. The tool here might better have been87c, 3° being deducted for the angle of relief.This more obtuse angle would work better thanthe acuter one, because in Fig, 5 the edge ofthe tool points into the work and has a tendencyto dig. Thus a change in…
Clocks and watches
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