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 214
ying-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 thelocations the holes are bushed with hardened steel bushes.Eventually even hardened bushes wear, but it is then a simplematter to remove the old and… … Fig. 185.—Large boring bar jig. with other operations which locate the work, rather than guidethe tool, are frequently called jigs but are more properlyfixtures. Jigs for large work are frequently seen, such an one from theCincinnati Planer Company being shown in Fig. 185, whichillustrates a jig…
Machine-shop practice
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