When using an image measuring instrument formeasurement, you may find that the same element of a part may have bothgeometric dimensional tolerances, shape tolerances, and positional tolerances.So, what is the relationship between geometric dimensional tolerances and shapepositional tolerances? This is entirely based on the functional requirements,that is, different tolerance principles are adopted for different requirementsin terms of fitting, assembly interchangeability, and other functional aspects.

Without any relation, it is called the principleof independence;

The principle of relevance refers tosituations where there is a relationship, and is further subdivided intoinclusion requirements, maximum entity requirements, minimum entityrequirements, and reversible requirements.