Contribution to the estimation of uncertainties in assembly operations assisted by 3D metrology

Jig -based assembly is a method widely used in the automotive and aerospace industries. Among its advantages, its robustness and its metrological performance (good repeatability) can be mentioned. In addition, even non-specialists can use it; the components are immobilized using stops before finalizing the assembly. Finally, quality is guaranteed through certification of the fixture used. On the other hand, the disadvantages are numerous. In addition to the significant cost of manufacturing and calibrating these jig, they are intended for a specific use; as soon as there is a modification or an alteration of the model or the components, costly modifications must be carried out. For approximately two decades, the development of 3D measurement systems has been impressive. Today, we have access to technologies that allow the simultaneous tracking of a set of targets (>30) within the workspace (up to 100×100 m) with good accuracy (