Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 43
the primary line of action is asgreat as the circular pitch, for otherwise, asin the figure, the gears will not be in continu-ous primary action. The rule for internal interference, simplystated, is that the diameters of the pitch linesmust differ by the sum of the diameters ofthe lines of action… … Internal,interference if both teeth have faces, and by six teeth ifone face is omitted. Fig. 62 shows the secondary contact in thecase of a standard internal gear of twenty-four teeth working with a pinion of twelveteeth, and it is to be noticed that the teethnearly coincide between the two points…
Gearing
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