The improvement of machining accuracy by applying the new tool path modification scheme is experimentally validated for the case where the proposed scheme is applied to pocketing. By maintaining cutting engagement constant, the cutting force can be regulated approximately constant, thus minimizing the variation of tool deflection, and improving machining accuracy. The semi-finishing path, the path prior to the finishing path, is modified by the proposed scheme such that the engagement angle along the finishing path is regulated at a desired level. This paper presents a new tool path modification scheme, which regulates a constant cutting engagement with workpiece in 2.5D end milling. This varying cutting force naturally leads to the variation of tool deflection, hence impairing machined surface accuracy. In pocketing with contour parallel (CP) paths, the cutter encounters a varying engagement with the workpiece, which causes variation in chip load and cutting forces.
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December 2022
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