A handbook on the teeth of gears, their curves, properties, and practical construction (1887)
Grant, George B. (George Barnard), 1849-1917 · [Boston] · leaf 57
When the radius 00 is equal to the heightFD, 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 ED to 00 still…
Gearing
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