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 73
Fig. 45.—Construction of precision worm wheels. When a precision worm wheel is to be originated the blankfor it is made in the manner shown in Fig. 45, the rim being inhalves as shown and the two halves being secured together bytaper pins of which there are at least four and sometimes more.The… … Fig. 46.—Appearance of worm wheel teeth when halves are reversed. will meet this requirement is itself a precision job of which,however, details are not here given. The worm wheel blank being placed in position on the bob-bing machine the teeth are cut, following which the rings areseparated,…
Machine-shop practice
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