Abstract
This paper presents a design of iterative learning contouring controller (ILCC) by considering actual contour error compensation (ACEC) to enhance the contouring performance of CNC machine tool feed drive systems. The proposed control iteratively modifies NC programs for each drive axis to reduce the contour error. Hence, the proposed controller can be directly applied to commercial CNC machines currently in use without any modification of their original controllers. The effectiveness of the proposed method has been experimentally verified through linear motor CNC machine tools with a non-smooth rhombus trajectory. Experimental results have shown that the maximum and mean contour error was reduced by 90.56% and 79. 34%, respectively, as compared to the originally equipped controller.
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