Methods of machine shop work : for apprentices and students in technical and trade schools (1914)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York : McGraw-Hill · leaf 213
^^y ^/ |y|| j|z bI lIn I ywl 5Pli |(ilililMii.,i,:iii!iiiiiii,if IL, ys … Fig. 184.—\arious forms of drilling jigs. variety of forms, a few of which are shown in Fig. 184. Theobject of a drill jig is to guide the tool, the laying-out of theholes being done once for all on the jig, uniformity of spacing DRILLING 203 in the work being thus assured. To insure permanence of…
Machine-shop practice
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