Within the context of mechanical parts machining, it is useful to reduce the number of manufacturing sequences required for a workpiece. In the case of milling, we must choose milling machine configuration and a workpiece setup. The collisionsbetween the tool and the finished part are an essential stage to be taken in account; this study is based on the notion of visibility. By comparing those visibilities with the milling machine abilities, it is possible to known if the piece can be machined in only one phase.
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