Expanding Tolerance Analysis for a Robust Product Design Expanding Tolerance Analysis for a Robust Product | Page 9

Expanding Tolerance Analysis for a Robust Product Design

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4.7 Result

Acknowledgements

The precision of the analysis measurement could be helpful
to make a cost-saving decision with more confidence.
In this study, the engineer should apply tighter tolerances to
the top contributors. Doing so could reduce the variation by
35%. This means the number of the tappet shims required to
be produced and maintained in inventories could be reduced
by 35%.

Special thanks and acknowledgement to Mr. Stephen Werst
of Sigmetrix and Mr. Leon Peng of Cybernet Systems.

±0.205

±0.133

References
[1] Peace, Glen Stuart, 1993 Taguchi Methods: A hands on approach,
Addison-Wesley Publishing Company, p. 5
[2] Reference Guide, CREO 2 Tolerance Analysis Extension, Powered by
CETOL Technology
[3] CETOL 6σ Tolerance Analysis Software User Manual, 2014
[4] Vlahinos A. 2007 "Time to Quality: Applying Six Sigma in Design to
Drive Costs Down & Quality Up," Design/Simulation Council's, Product
Lifecycle Management Road Map, CPDA,
[5] Vlahinos A. 2006 "Robust Design Techniques for Evaluating Fuel Cell
Thermal Performance," (ASME paper #2FUELCELL2006-97011)
[6] Vlahinos A. 2004 "Effect of Thickness and Material Variations on SixSigma Performance Targets of a Door Assembly," SAE Journal of Body
and Assembly International
[7] Vlahinos A. 2004, etc "Designing For Six-Sigma Quality with Robust
Optimization using CAE," (SAE paper # 2002-01-2017)

Fig. 20. Tolerance Adjustments

5.0. Summary
Robust design is a multi-discipline process that has been
made substantially easier and more effective with the modern
software tools available. The steps outlined in this paper are
fundamental to a robust design and if followed, can help
engineers design products that are more capable of sustaining
the impact of the many sources of variations.

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