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 72
ch carries the blank operated upon, andthere is the same necessity for precision workmanship in thisworm wheel as in index plates. A method of constructing theseworm wheels has come down to us from early times and is stillin use. The work is done upon a bobbing machine which it is firstnecessary to… … Fig. 43.—Worm wheel bobbing machine.
Machine-shop practice
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