This paper describes with precision the steps adopted for the development of a digital functional assistance process for tolerancing, developed in collaboration with the RENAULT automobile group. This process is based on the formalization and digital integration of U.A.C.s. (Use Aptitude Conditions). Moreover, it uses the TTRS and the pseudo-TTRS model which then provides a tolerancing model that can be digitized and craft rules used, enabling capitalization on know-how in the tolerancing field. These steps are illustrated by a real case study.

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