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 277
Fig. 269.—Gear hobbing machine set for helical gears. 266 METHODS OF MACHINE SHOP WORK interference with one another which, from the illustration, mightbe inferred to take place. … Fig. 270.—Floor plate gear cutting machine, templet system.
Machine-shop practice
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