American machinists' handbook and dictionary of shop terms : a reference book of machine shop and drawing room data, methods and definitions (1914)
Colvin, Fred H. (Fred Herbert), 1867-1965, Stanley, Frank A. (Frank Arthur), b. 1874 · New York : McGraw-Hill book company ; London : Hill · leaf 197
As indicated by the diagrammatic sketchFig. 2, the worm wheel A is secured to the main spindle of the spiralhead and rotated by means of the worm shaft and single-threadedworm B. The index plate (having rows of equally spaced holes)remains stationary during the dividing operation, and is fitted… … FiG. I. — BrowTi & Sharpe Dividing Head Arranged forDifferential Indexing dard ratio between the worm B and the worm wheel A is i: 40; andto find the movement of the index crank for any required division,the following formula is employed: The movement of the index crank = ^ where N is the…
Machine-shop practice
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