Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional mechanic .. (1919)
Yates, Raymond F. (Raymond Francis), 1895- ed · New York, The Norman W. Henley Pub. Co. · leaf 71
iderably largerthan the gauge of the drill. When a drill is to be used for drilling brass or cast 68 Model Engineering iron, it should not be sharpened in the ordinary manner.The lip of the drill should be ground off as shoA\Ti in Fig.47. Aside from the advantage of cutting faster, thisprevents the… … b^ck £J^& rig. 44—A twist drill with the names of the various parts the procedure in boring the holes in the brass plate. Thelarge center hole shall be the first one drilled. It wouldbe very bad practice to start drilling this hole with a%-inch drill, as the web of such a drill is so broad…
Machinery
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