A Simpler and More Formal Geometric Tolerancing Model

A model of tolerances and its graphical language is presented by giving new definitions to the size, form, orientation and location tolerances. Contrary to the ISO tolerancing, this model warrants: (1) the global tolerancing of the part even if non-tolerance is indicated thanks to the general tolerances of the model (2) the geometrical deviations limited by the tolerances are independent of one another, and (3) any graphical indication permitted by the language has a meaning on any surface.One simple mechanism is toleranced using the proposed model and language.