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 50
er-ence will generally set a limit to the diameterof the smallest pinion with which a rack toothhaving the given addendum will work, with-out bearing on the second branch of thepinion flank. The diametral pitch being unity, a the ad- THE NORMAL THEORY OF THE GEAR TOOTH CURVE. dendum EX, Fig. 25, 5,… … Interference ofSegmental Teeth 32. Therefore, the common involute systemcannot have an addendum of unity on an in-terchangeable set having gears with less thanthirty-two teeth. When the set includes 12teeth, as is usual, the addendum must beshortened, or the points must be roundedover, as at…
Gearing
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