Shop practice for home mechanics, use of tools, shop processes, construction of small machines. Contains a chapter also on theoretical mechanics and on miscellaneous information relative to shop work (1920)
Yates, Raymond F. (Raymond Francis), 1895- · New York, N. W. Henley Pub. Co. · leaf 109
Fig. 128—How a twist drill produces a larger hole than its diameterwhen it is improperly ground erally 60 degrees for ordinary work and when grindingthe drill the little instrument illustrated in Fig. 129 isused to guide the work. Of course it mil be understoodthat such a gauge could not be used on… … Fig. 129—The use of a protractor in grinding a large drill In using the gauge it should be applied to both sides sothat they will both be ground at the proper angle. Theflute of the drill is a valley cut spirally the whole length Drilling and Reaming 109 of tlie drill. The web is that portion in…
Machine-shop practice · Handicraft
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