Wearring, Collin; Karl, Dennis P. (1995, ASQC) Variation Systems Analysis, St. Clair Shores, MI
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Geometric dimensioning and tolerancing (GD&T) enhances communication between product engineers and manufacturing engineers. The GD&T symbols or specifications that appear on a design decrease the likelihood of harmful variations during product fabrication. In a computer simulation of 5,000 parts, 99% of the items passed inspection when GD&T specifications were followed. The rate dropped to about 20% when specifications were not available to control features and positions of the parts. Such computer modeling can quantify the effect of variation on inspection and assembly.
Design,Manufacturing,Standards and specifications,Tolerances