Handbook for machine designers, shop men and draftsmen (1916)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 126
. 16 the pitch and base circles are shown, the latter -beingdetermined by the angle of obliquity, a. The manner in which theinvolute profile is generated involves the equality of any arc of thebase circle and the corresponding tangent. This implies that thebase circle arc spanning one tooth and… … Fig. 16.—Gaging gear teeth with the vernier caliper. If the base circle is larger than the root circle the tangent will bethe maximum dimension over two teeth. With large obliquities,as in some systems, the base circle falls within the root circle and insuch cases it may be necessary to gage over…
Machine design
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