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 274
equal to that of the gear to be cut. In action, thehob is adjusted at an angle, as shown in the plan view of Fig. 267,such that the tangent to the helix is parallel with the teeth GKAR CUTTING 263 to be cut. At the beginning of the cut the hob is presented tothe side of the blank. The feed is… … Fig. 267.—Principle of the bobbing process of gear cutting. that of a rack, the result is to produce conjugate forms in thegear just as the reciprocating tool of the same profile producesconjugate forms. By suitable adjustments, with means for which the machinesare provided, helical gears may be…
Machine-shop practice
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