A handbook on the teeth of gears, their curves, properties, and practical construction (1887)
Grant, George B. (George Barnard), 1849-1917 · [Boston] · leaf 55
t=12, and sin. F=:.25, we have a=^, sothat the common involute, Fig, 28, is limitedto the addendum ab=^^, and the additionalbc=^ of the full addendum must be cut off orgot out of the way by rounding off as muchof it as would interfere with a twelve-toothpinion. This additional five-eighths is not… … pitchline* Action ofCorrected Involute Tooth The only true correction, the only devicethat will allow of a full addendum of unity,retain the true involute for any part of it, andpermit a rack to run in a pinion of less thanthirty-two teeth, would be to correct the racktooth by rounding over the…
Gearing
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