Volumetric positioning error is an important index that influences the machining accuracy of five-axis machine tools. Although the available compensation methods, including hardware and software compensation, provide approaches to improve the volumetric positioning accuracy of five-axis machine tools, the cost-effect ratio of these methods is usually not acceptable for most users. Based on the volumetric error model of a five-axis machine tool and the sag error compensation function together with the table multiplication function in Siemens 840D system, a novel volumetric positioning error compensation method is proposed in this paper. The experiments show that the proposed compensation method can effectively improve the machining accuracy of the machine tool with really low cost, which shows good perspective in manufacturing industry.
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This project is financially supported by the National Key Scientific and Technological Project (grant no. 2017ZX04002001).
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