Spur and bevel gearing; a treatise on the principles, dimensions, calculation, design and strength of spur and bevel gearing, together with chapters on special tooth forms and methods of cutting gear teeth (1914)
New York, The Industrial press; [etc., etc.] · leaf 19
dot line — calledthe pitch line.^ As teeth are generally proportioned, this Hnefalls nearly, but not quite, midway between the tops and bottomsof the teeth, the inequality being due to the space left at the 4 SPUR GEARING bottom of the teeth for clearance. The diameter of the pitchcylinder is… … Fig. 4. Method of obtaining Involute Tooth-curves being the name of a curve described by the end of a cord as itis unwound from another cur\e. For example, to draw aninvolute, wind a cord around a circular disk of any convenientmaterial, and make a loop in the outer end of the cord. Laythe disk…
Gearing
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