Bench work in wood: a course of study and practice designed for the use of schools and colleges (1902)
Goss, W. F. M. (William Freeman Myrick), 1859-1928 · Boston, Ginn & company · leaf 70
-^•^^^■^ ^W work, is triangular in section. This form allows the bit to feedrapidly, or very slowly, in accordance with the degree of pres-sure applied to it. The point, or nib, B cuts the fibers aboutthe proposed hole, and the cutting lip C removes the material.The center-bit does not w^ork well… … 92. Expansive Bits are so constructed as to be adjust-able for holes of any size, within certain hmits. There areseveral forms in use, one of which is shown by Fig. 116.This, without the -p^ig^ n^movable cutter C,will bore a hole .f in diameter, thescrew A centeringand feeding it into the work, B…
Woodwork (Manual training)
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