Three-dimensional metrology with the virtual fitting gauges

The metrology implemented in several classical software equipping the coordinate measuring machines, does not correspond to the standardized tolerancing by zones, virtual conditions and perfect datum features fitted outside the matter. On the basis of these concepts and by generalizing them, a conceptual model of "fitting virtual gauges" is presented. On a part presenting two positional tolerances, the plans of inspection according to the traditional metrology and according to the metrology by fitting gauges, are compared from the point of view of their simplicity and their potential results. A fitting gauges based software is under development. It will make it possible "to save" a certain number of parts declared not conform by traditional threedimensional metrology.