16.3. STATISTICAL TOLERANCING
For our discussion of statistical tolerancing we will use the definitions of limits proposed by Juran and Gryna (1993), which are shown in Table 16.5.
In manufacturing it is common that parts interact with one another. A pin fits through a hole, an assembly consists of several parts bonded together, etc. Figure 16.15 illustrates one example of interacting parts.
Suppose that all three layers of this assembly were manufactured to the specifications indicated in Figure 16.15. A logical specification on the overall stack height would be found by adding the nominal dimensions and tolerances for each layer; e.g., 0.175″ ± 0.0035″, giving limits of 0.1715″ and 0.1785″. The lower specification is equivalent to a stack ...
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