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
willbe well to thoroughly understand modern twist drills andtheir operation. A tw^ist drill and the names of its va-rious parts is sho\ATi in Fig. 127. It will be seen that thecutting or forward edge is slightly higher than the backedge. The difference in this height is called the clearance 108… … 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…
Machine-shop practice · Handicraft
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