The Importance of Following GD&T Specifications


Wearring, Collin; Karl, Dennis P.   (1995, ASQC)   Variation Systems Analysis, St. Clair Shores, MI

Quality Progress    Vol. 28    No. 2
QICID: 12948    February 1995    pp. 95-98
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Article Abstract

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

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