Development of a Motion Accuracy Measurement System of NC Machine Tools

• Published in: Journal of the Japan Society for Precision Engineering, Contributed Papers Vol. 71; no. 8; pp. 1000 - 1004
• Main Authors: USHIO, Masaki, USHIJIMA, Hidefumi, KOUYA, Masahide, NARAHARA, Hiroyuki, SUZUKI, Hiroshi
• Format: Journal Article
• Language: English; Japanese
• Published: Tokyo The Japan Society for Precision Engineering 2005; Japan Science and Technology Agency
• Subjects: Interpolation accuracy; Multi-axis CNC machine tools; On machine measuring device
• ISSN: 1348-8724; 1881-8722
• DOI: 10.2493/jspe.71.1000

The measurement device has been developed which could measure various kinds of dynamic accuracy of multi-axis NC machine tool in this study. The DBB device has been widely used to examine a circular motion and also to estimate an assembly error of machine tool. Grid scale encoder device is a commercially available device which can be used for accuracy checking of the several kinds of two dimensional interpolation in the non-contact mode. The laser interferometer is the basic equipment for measuring positioning errors in a single motion and measuring data are used to compensate them. In case of multi-axis NC machine tool, it is important to estimate the interpolation accuracy under simultaneous multi-axis controlling in which tool motion will be much more complicated compared with that of three axis NC machine tool. The methods of testing and evaluating the accuracy and repeatability of positioning of NC machine tool axes are specified by ISO 230-6. On the other hands, the methods of them which can be applied for multi-axis NC machine tool is not specified and the standardized measuring device is not realized. The purpose of this study is to develop the on machine measuring device and the measuring methods which can examine the interpolation accuracy of multi-axis machine tool under the no-load condition.