Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 175
he bow, agree in kind with thoseof much larger dimensions, it will be convenient to consider as one group, the forms of the edges of thosedrills which cut when moved in cither direction. Figs. 522, 523, and 524, represent, of their largest sizes, the usual forms of drills proper for the… … Fig. 522 is the ordinary double-cutting drill; the two facets forming each edge meet at an angle ofabout 50 to 70 degrees, and the two edges forming the point meet at about 80 to 100 ; but the watch-makers, who constantly employ this kind of drill, sometimes make the end as obtuse as an angle…
Mechanical engineering · Mechanics · Engineering
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