Metal-work; a handbook for teachers and students (1914)
Adam, Hugh M. [from old catalog], Evans, James Humphrey, [from old catalog] joint author · New York, Longmans, Green and co.; London, E. Arnold · leaf 174
core make it extremely valuablein tool work. Typical examples of case-hardening are setscrew ends, as used in stocks, dies, and lathe-tool holders,spanner ends, and holding parts of tap-wrench. CHAPTERIXVI DEILLING, RIVETING, PUNCHING, SHEARING, AND GRINDING Drilling.—The drilling of small holes is… … Fig. 135. This drill is usually made from a bar of round cast-steel,forged flat at the end, filed or ground as shown, and after-wards hardened and tempered. The angle formed by thecutting edges is usually about 90 degrees, but, as the point ofthe drill must always be in the metal when the extreme…
Metal-work
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