%0 Journal Article %A F. Sebaa and A. Cheikh and M. Rahou %D 2010 %J International Journal of Industrial and Manufacturing Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 41, 2010 %T A Contribution to 3D Modeling of Manufacturing Tolerance Optimization %U https://publications.waset.org/pdf/6049 %V 41 %X The study of the generated defects on manufactured parts shows the difficulty to maintain parts in their positions during the machining process and to estimate them during the pre-process plan. This work presents a contribution to the development of 3D models for the optimization of the manufacturing tolerances. An experimental study allows the measurement of the defects of part positioning for the determination of ε and the choice of an optimal setup of the part. An approach of 3D tolerance based on the small displacements method permits the determination of the manufacturing errors upstream. A developed tool, allows an automatic generation of the tolerance intervals along the three axes. %P 464 - 468