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 71
turned upon it. A number of smaller discs b, equal innumber to the divisions required are made—such discs beingabout the easiest of all things to make of a high degree ofaccuracy and uniformity. The diameters of the ledge a and ofthe discs h are so calculated that, when the discs are placed… … Fig. 42.—Second method of originating index plates. ORIGINATING INDEX WORM WHEELS In a very common form of gear cutting machine the indexingof the gear teeth is dependent upon a large worm wheel mountedupon the shaft which carries the blank operated upon, andthere is the same necessity for…
Machine-shop practice
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