Precision in Computer Numerical Control (CNC) machining is crucial to manufacturers in their quest to achieve better productivity. During the machining process planning, various factors must be considered, from workpiece design to manufacturing, and finally, to inspection, all of which influence the final quality of the workpiece. In this study, geometric and dimensional errors of fixture's locators, the workpiece datum features' errors in locating a workpiece on a fixture and machine tool geometric errors will be considered in evaluating the accuracy of drilling or milling of a workpiece feature based on the Small Displacement Torsor (SDT) theory. Specifically, the tolerances that are assigned to fixture locators, the workpiece datum feature geometric errors and the machine tool translational and rotational errors are combined in the same model in order to estimate the workpiece machined feature conformity by the mean of the Monte-Carlo tolerance analysis simulation method. This work aims to help fixture designers make better decisions with respect to fixture tolerancing upstream of manufacturing based on a certain predefined confidence level.
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