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2001 Conference Presentations
|Including GD&T Tolerance Variation in a Commercial Kinematics Application
Dabling, Sandia National Labratories
Previous ADCATS research developed a method for analyzing variation in
2D assemblies using commercial kinematic software. Using
a velocity/variation analogy, Equivalent Variational Mechanisms (EVMs)
were developed to allow a kinematic model to be modified to introduce
dimensional variation. Following
appropriate modeling procedures, the assembly variation can be calculated
using standard kinematic equations.
This presentation describes the work of expanding the 2D research to 3D assemblies. In addition, similar techniques are described for incorporating geometric variation. Geometric variation can contribute significantly to assembly variation through parallelism, perpendicularity, profile, and related form issues.
With these newly developed EVMs, a 3D kinematic assembly can be modified to allow dimensional and geometric variation to be included in a tolerance analysis using commercial software. With the wide availability and use of kinematic/dynamic analysis software as compared to variation analysis software, these methods allow complicated 2D and 3D tolerance analysis to be performed by a wide segment of industry that previously had no such capabilities.
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