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 118
ht iron or steel, the drill should be flooded mtlia cutting compound or lubricant. Ordinary machine oilcan be used for this purpose or a less expensive substi-tute can be found in good soapy water. Brass, copperand cast iron should always be drilled dry. It is advisable many times to employ what is… … Leaol Hofe---Fig. 137—A lead hole made by a smaller drill will guide a larger drill 137. In case of a hole being drilled on a slightly in-clined surface the lead hole should always be used as theweb of the large drill is so thick that it is difficult to start
Machine-shop practice · Handicraft
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