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
Fig. 43.—Worm wheel bobbing machine. … Fig. 44.—A hob. concealed by it and mounted on the cutter spindle is a hobwhich does the work. A hob is shown in Fig. 44. It is a cross 62 METHODS OF MACHINE SHOP WORK between a milling cutter and a tap or, otherwise described, itis a worm suitably gashed and relieved to make it a cuttingtool. The…
Machine-shop practice
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