A Probabilistic View of Problems in Form Error Estimation

[+] Author and Article Information
Tai-Hung Yang, J. Jackman

Department of Industrial and Manufacturing System Engineering, Iowa State University, Ames, IA

J. Manuf. Sci. Eng 119(3), 375-382 (Aug 01, 1997) (8 pages) doi:10.1115/1.2831116 History: Received July 01, 1994; Revised December 01, 1995; Online January 17, 2008


Form error estimation techniques based on discrete point measurements can lead to significant errors in form tolerance evaluation. By modeling surface profiles as random variables, we show how sample size and fitting techniques affect form error estimation. Depending on the surface characteristics, typical sampling techniques can result in estimation errors of as much as 50 percent. Another issue raised in the fitting approach is the metric p selection for the fitting objective. We show that for p = 2 and p = ∞, the selection does not appear to significantly affect the estimation of form errors.

Copyright © 1997 by The American Society of Mechanical Engineers
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