The mechanical engineer's pocket-book. A reference-book of rules, tables, data, and formulæ, for the use of engineers, mechanics, and students (1910)
Kent, William, 1851-1918 · New York, J. Wiley & sons · leaf 1190
n-gent to the pitch-circles. In the cut the angle is 20°. From the centersol the pitch-circles draw circles c and d tangent to the line AB. Thesecircles are called base-lines or base-circles, from which the involutes Fand K are drawn. By laying off convenient distances, 0, 1, 2, 3, whichshould each… … Fig. 174. respective base-circles, where a tangent to the involute becomes a radiusof the circle, and the remainders of the tooth curves, as G and H, areradial straight lines. In the involute system the customary standard form of tooth is onehaving an angle of obliquity of 15° (Brown and Sharpe use…
Mechanical engineering
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