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Tolerancing of assembly mechanisms is a major interest in the product lifecycle. One can distinguish several models with growing complexity, from1-dimensional (1D) to 3-dimensional (3D) (including form deviations), and twomain tolerancing assumptions, the worst case and the statistical hypothesis.This paper presents an approach to 3D statistical tolerancing using a newacceptance criterion. Our approach is based on the 1D inertial acceptancecriterion that is extended to 3D and form acceptance. The modalcharacterisation is used to describe the form deviation of a geometry as thecombination of elementary deviations (location, orientation and form). Theproposed 3D statistical tolerancing is applied on a simple mechanism with leverarm. It is also compared to the traditional worst-case tolerancing using atolerance zone.

A proposition of 3D inertial tolerancing to consider the statistical combination of the location and orientation deviations