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 142
ompany, is shown inFig. ii6. The lead screw to be tested passes through thehollow spindle and is gripped in a chuck by which it may beturned by a covered worm gear and the crank at the left, anindex wheel and stationary zero enabling the screw to be turnedan exact number of revolutions. The screw… … Fig. h6.—Measuring errors of pitch of lead screws. finger on the carriage, the screw is given such a number of turnsas would, were the screw without error, advance the carriagean exact inch. This being done, a one-inch end-measure rodis placed between the finger points on the carriage and…
Machine-shop practice
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