In Geometric Dimensioning and Tolerancing (GD&T) there has been a long-standing conflict between the worlds of specification and measurement. The goal of specification is to ensure that components will function; the goal of measurement is to ensure that manufactured components meet those functional requirements. The conflict often arises when design specifications are not easily assessed by available measurement technologies and procedures.
This conflict has been elevated with the release of ASME Y14.5-2018 and a new fundamental rule “s”: