A handbook on the teeth of gears, their curves, properties, and practical construction (1887)
Grant, George B. (George Barnard), 1849-1917 · [Boston] · leaf 57
d flank, as in Fig. 34, isweak, it is customary to so limit the radiusof the pinion that it shall never be less thanthe height of the originating cycloid. As the proportion of ED to 00 still furtherincreases, the flank is still more undercurved.until when 0C= ^ ED, we have the base, OF, equal to… … If the height of the cycloid is greater thanthe diameter of the pinion. Fig. 35, the flank isa lobe, entirely external to the pitch line; andalthough the contact is still mathematicallyperfect, it is no longer practicable, for it ison the inside of the cycloid, as shown at P.
Gearing
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