Generation of manufacturing tolerancing with ISO standards

Current developments in tolerancing with ISO standards for the purpose of defining parts now call for new methods to analyze these three-dimensional specifications and to generate manufacturing specifications with ISO standards. In this pursuit, the proposed method has been based on a graphical representation of part features, process plans and functional requirements defined with an ISO standard that includes datum reference frames. A simple iterative procedure determines the ISO specifications of each phase according to the workpiece set-up. This algorithm uses a vectorial representation of the tolerance zone that corresponds to degrees of freedom imposed by each set-up surface. The presentation is limited to the machining process alone. An application on a 3D milling machine will also be displayed.