A handbook on the teeth of gears, their curves, properties, and practical construction (1890)
Grant, George B. (George Barnard), 1849-1917 · Lexington, Mass., Lexington Gear Works · leaf 53
When the radius OCis equal to the heightED, as in Fig. 33, the flank will be a straightdiameter OF. … When the radius is less than the height, asin Fig. 34, the flank will be a convex lobe. As an undercurved 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 EDio OC still…
Gearing
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