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 159
pulley drive are given in Figs.136, 163, 181, 182, 183, 216, and 217. THE CONE-PULLEY BELT SHIFTER For the miUing machine the constant speed drive, as explainedat length in the chapter on milling, has peculiar fitness and in 148 METHODS OF MACHINE SHOP WORK all applications it provides a… … Fig. 126.—Mechanical belt shifter for cone pulley belts. is too simple, cheap and adaptable a thing to be discarded andmanufacturers are beginning to turn their attention to it again.When proportioned in the manner that has been explainedits most serious original defects—too large speed intervals…
Machine-shop practice
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