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 42
Truncated teeth To avoid this oblique action and at the sameiime allow the use of gears of few teeth, it iscustomary to truncate or cut off the apex ofthe curve, as shown by Fig. 11, by a line,called the addendum line, at an arbitrary dis-tance from the pitch line. The sides of the teeth are then…
Gearing
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