American machinists' handbook and dictionary of shop terms : a reference book of machine shop and drawing room data, methods and definitions (1914)
Colvin, Fred H. (Fred Herbert), 1867-1965, Stanley, Frank A. (Frank Arthur), b. 1874 · New York : McGraw-Hill book company ; London : Hill · leaf 81
le. A gage as shown in Fig, 4 willhelp both to get the angle and to grind them central. This gives theusual lip edge of 59 degrees. Fig. 5 shows how you can see if bothlips are ground alike, but does not give the angle. Fig. 6 is a sug-gestion by Professor Sweet of relieving the drill back of the… … FIG. 9 FIG. 6 Grinding Twist Drills the drill. This does away with the tendency to draw into the work.Fig. 7 shows how this is done. It is sometimes necessary to thin the point of the drill to get bestresults. This requires care in grinding but can be done as shownin Fig. 8. The best all-around…
Machine-shop practice
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