Cyclopedia of mechanical engineering; a general reference work. Editor-in-chief Howard Monroe Raymond. Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing (1908)
American School (Chicago, Ill.), Raymond, Howard Monroe · Chicago American Technical Society · leaf 412
Fig. 05. Idle Gear. In Fig. 67, gear E drives gear F, and F drivesG, that is, F is both a driven and driving gear. Let E have 25teeth, F 30 teeth, and G 50 teeth, and let shaft C make 100 R. P.M. Then fiora the rule given above, ll.P.M.of A=100X|| X li-In this equation the number of teeth of F (30)… … Fiij. 60.the numerator and denominator of the fraction, and will thereforecancel each other, so that the equation becomes R. P. M. of A = 100 X f^ Therefore, the speed of A depends only upon the number of teethin E and G. Gear F is called an idle gear or idler. It should benoticed, however, that A…
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