Thomas, Hugh Kerr · New York : McGraw-Hill Book Co. · leaf 61
hn Younger has supphed the followmg means of obtam-ing the value of /?. The length of the worm ^ is a multiple n of the circularpitch P, and it contains in its length a certain number ofthreads n of which it is most important to take the fullest pos-sible advantage. In order to ensure this, it is… … Fig. 20. Let A B in Fig. 20 be the length of the worm = g^; AC is theoutside circumference of the worm. From the point A, ADis drawn so that the angle DAC =a. From B, the line BEis drawn perpendicular to AD. The distance A E is the lengthof the arc of the worm which must be subtended by the…
Gearing, Worm
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