A handbook on the teeth of gears, their curves, properties, and practical construction (1887)
Grant, George B. (George Barnard), 1849-1917 · [Boston] · leaf 53
t cusp (^ of Fig. 27 ;but beyond that, when it is on the secondbranch (^ JR, the flank curve is inside the rackface, and the action is impracticable. There will also be an actual interferencewith the first branch, When the point ofcontact is on the second branch, the rackface will cross the first… … a circle P 8 with respect to the rack, but onthe wheel will trace out the segmental flank0 Q R D. If the pin A is carried by an arm on theother side of the rack pitch line, the face ofthe pinion tooth will be drawn, but, as theform of the face is very simple, the utilityof the instrument is…
Gearing
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