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 56
d PRECISION WORK AND WORKMANSHIP 45 they satisfy the test, the correctness of the sixty-degree anglesis obviously proven. OTHER METHODS OF ORIGINATING ANGLES There is in the machine shop a surprising lack of appliancesfor making pieces of which the surfaces are to have variousangles with one… … Fig. 2q.—Two-disc method of originating angles. In the absence of provisions of this sort, when correct anglesare required other than those supplied by the milling machineprotractors, it is necessary to resort to various expedients.One such expedient is shown in Fig. 29, which shows a…
Machine-shop practice
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