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
be Od f bX THE NORMAL THEORY OF THE GEAR TOOTH CURVE. right angles at 0 with the pitch line, andmeeting it again at/, where Oe f = Oef. The face cycloid ODF forms a flank,OD F\ on the pinion, that is at right angleswith the pitch line at 0, meets it again at F\where OD F=ODF, and which takes… … When the radius OCis equal to the heightED, as in Fig. 33, the flank will be a straightdiameter OF.
Gearing
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