The advanced machinist; a practical and educational treatise, with illustrations (1903)
Hawkins, Nehemiah, 1833- · New York, T. Audel · leaf 212
Fig. 232. Fig. 233. Fig. 234. Fig. 235 shows a device designed for use on a twist drill.To grind twist drills to the proper angle, place the drillparallel and against the left-hand leg, to bring the cuttingedge parallel with the other leg. Note the length of onecutting edge by the graduations, then… … Fig. 235. way round to get the length of the other cutting edge, andcontinue turning the drill and grinding the edges untilthey are the same length. 2IO The Advanced Machinist. TABLE OF SPEEDS The table below gives the revolutions per minutefor drills from r^ inch to 2 inch diameter, as…
Machine-tools · Machine-shop practice
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