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2001 Conference Presentations
|Position Error in Assemblies and
Statistical and Deterministic Methods
Jon Wittwer, Brigham Young University
A common misconception in tolerance analysis is that
the circular tolerance zone is the best representation of position error.
While this is true for simple two-dimensional features with
location dimensions that have equal standard deviations, for assemblies
and mechanisms the position error is best described as elliptical.
Both deterministic and probabilistic methods have been used to determine the effects of manufacturing tolerances on position error. This presentation demonstrates the use of the direct linearization method to estimate the position error, and compares this method to other deterministic and probabilistic methods. The generalized Bivariate normal model is shown to be an accurate representation of position error in two-dimensional assemblies and mechanisms.
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