Chapter 24
Statistical Tolerancing and Its Specificity


Readers will learn:

1. To prepare a tolerance stack-up analysis on a fixed fastener assembly to calculate a wide variety of unknown factors, such as interference problems.

2. The rules for beginning a tolerance stack-up analysis.

3. How to choose and work the route of pertinent factors∕numbers.

4. To calculate the inner and outer boundaries for geometrically controlled factors.

5. How to create a “numbers chart” with all pertinent factors.

6. To prepare a summary of Gap Analysis.

7. How to calculate a Statistical Tolerance using Root Sum Square, Root Sum Square with a correction factor and Monte Carlo methodologies.

8. How to predict “natural tolerance” (the amount of assembly tolerance likely to be consumed by manufacturing.

9. How to increase part tolerances to take advantage of statistical predictions.

10. How to reintegrate increased tolerances back into the assembly.

11. How to specify a statistical tolerance on the part drawing.

12. A glossary of statistical terms.

  • -Some Useful Definitions When Geometric Tolerances are Used
  • -Symbology for SPC Formulas
  • -Arithmetic Mean; Normal Distribution of Tolerance and the Standard Deviation; Statistical Probability for Tolerance Stack-Up Analysis for Positional Geometric Tolerances
  • -Calculating a Standard Deviation
  • -Predicting the Amount of Tolerance to be Consumed by Manufacturing
  • -Charts and Tables

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