Geometry and position error measuring system of CNC machines based on LabVIEW

YE Huaichu1, LI Zhiqiang2, WANG Pengxiang1, CHEN Huan1,ZHAO Wenhong2
(1. Zhejiang Institute of Metrology, Hangzhou 310013, China;
2. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310000, China)

Abstract: To achieve the precision measurement of form and position errors of NC, torsion spring and marble leveling rule were applied in measuring the straightness of the guide way, and the grating scale of HEIDENHAIN were adopted for position error measuring. The virtual instrument based on LabVIEW were developed for further processing, to which the measuring datas were collected through data acquisition card. A geometry and position error measuring system of CNC machines based on LabVIEW was proposed. The system was capable in measuring the straightness of guide way, the position precision and repetitive position precision.Under the same parameter value, the result compare to the data of the measurement with laser interferometer，which adopt the way of statistical analysis in GB/T17421.2-2000.Experiment results show that it is available with high precision and high resolution.
Key words: NC; straightness accuracy; positioning accuracy; repeat positioning accuracy; measurement system