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 123
Fig. 147—A bottoming drill duce a perfectly flat bottom, as sho^vn in B (Fig. 146),what is known as a bottoming drill is employed. Such adrill is illustrated at Fig. 147. This drill can also beused as a counter-bore, as shown in Fig. 148. It is oftennecessary to use such a drill for this purpose in… … Fig. 148—The use of a bottoming drill screw, a counter-sink must be used. Counter-sinks aremade in various angles and several are shown in Fig.150. A flat-headed machine screw properly seated bymeans of a counter-sink is shown at Fig. 151. After con-tinued use, the edges of the counter-sink ])ecome…
Machine-shop practice · Handicraft
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