Tolerance Stack-Up Analysis : Chapter 11

THE THEORY OF STATISTICAL PROBABILITY Topics •Gaussian Frequency Curve •Standard Deviations •Plus or Minus 3 Sigma •Root Sum Square Formula •Steps to Calculate and Apply Statistical Tolerances •Statistical Tolerancing Applied to Plus and Minus Toleranced Assemblies •Statistical Tolerancing Applied to Geometric Toleranced Assemblies •When Best to Allow Statistical Tolerances and When it Should Not Be Allowed •The Logic of Statistical Tolerancing •Modifying the Root Sum Square Formula with a Safety/Correction Factor •Reintegrating the Statistical Tolerance into the Assembly •A Simpler Way? •More Statistical Formulas and Symbols