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Chapter 28
Definitions

Excerpt

Absolute Gage Tolerancing (pessimistic tolerancing). A policy of tolerancing gages that insures the complete random interchangeability of parts to assemble by applying the gagemaker's tolerances, the wear allowances, the measurement uncertainties and the form controls-all within the workpiece limits of size. This policy featured for GO and NOGO gages by the ASME Y14.43 standard on Dimensioning and Tolerancing Principles for Gages and Fixtures.

Actual Local Size. The value of any individual distance at any cross section of a feature.

Actual Mating Envelope. For an external feature of size, it is the perfect feature counterpart that is the smallest size that contacts the surface at the highest points. For an external cylindrical feature, it would be the minimum circumscribed cylinder. For two parallel planar external opposing surfaces, it would be two parallel planes at minimum separation. For an internal feature of size, it is the perfect feature counterpart that is the largest size that contacts the surface at the highest points. For an internal cylindrical feature, it would be the maximum inscribed cylinder. For two parallel planar internal opposing surfaces, it would be two parallel planes at maximum separation.

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