Technological heredity in spur gear manufacturing

The initial error of a blank or the residual error of machining surfaces are partially corrected and partially inherited by the machining error of the next operation. Locating surface error also exhibits a similar effect on machining error. This article establishes the degree of heredity of the preceding machining error and the locating surface error on the machining error of the corresponding operation. The object under investigation was a spur gear being produced under mass-production conditions. Both the integral and the partial effects of the input residual error of the machining and locating surfaces have been established by one factorial and two factorial correlational analysis, which analysis shows that in turning and gear machining operations, the degree of heredity of the input locating surface error on the machining error of the corresponding operation is much greater than that of the input machining surface error. A flow chart of the heredity of machining errors in spur gear manufacturing operations has been developed. (C) 1999 Elsevier Science S.A. All rights reserved.