This drawing, for example, only requires that the size and inner boundary (virtual condition) of the hole be verified. The virtual condition is a single limit requirement. The theoretical design size of the gage pin (1) is 8.0-0.2=7.8. The distance from the axis of the datum simulator to the surface of the gage (2) is 3.9 (7.8/2).
By using an indicator, which is mastered at 3.9 from the datum simulator, variable data may be collected. Recording the distribution of data relative to the inner boundary allows the calculation of the Cpk of the process.
