Abstract
The objective of this study is to clarify the optimum direction of tool revolving axis where the machining error of the surface geometrically becomes the minimum in 5-axis machining. This paper describes the geometric calculation method of mashined surface and the relationship between shape of machined surface and position of cutting edge. In the result of the analysis, both the best and the worst orientation were found at very small tilting angles. In the worst case, the trajectory of cutting edge generates the complicated surface, because of the stationary point of velocity along feed direction which locates inside of the machined region rather than outside in the best case.
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