Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 7
r teeth that theyshall transmit the same uniform motion be-tween the rotating cylinders, as would beapparently transmitted by friction. These cylinders are imaginary in actualpractice, although they are one of theprincipal elements of the theory, and theyare called the axoids, or pitch cylinders… … Tooth action With the above conditions given we candeduce the following law: THE LAW OF TOOTH CONTACT. The common normal to the tooth curves mustpass through the pitch point. That is, in Fig. 2, if the tooth curves ODand 0 d are to transmit the same motionbetween the pitch lines pi and PL aswould…
Gearing
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