Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 130
The cutting edgesare usually ground to an angle of sixty degreesto the center line of the drill; for brass work theangle should be fifty degrees. The manner in which a lathe tool cuts metal is shown in anoutline which represents a tool feeding a cut along a piece ofwrought iron. The removed metal,… … Twist drill. 94 FORM—LATHES Joshua Rose, in determining the proper shape of a cutting tool,for use in a lathe or a planer, is where it shall have the rake, or
Inventions · Inventors
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