The features of the widely-used coordinate measuring arm (CMA) are discussed. A novel technology for quick volumetric error verification of CMA is presented. A modular space frame (MSF) to verify and calibrate the measuring accuracy of CMA is invented, which consists of standard balls, links and bases. An effective verification procedure is developed. Results are presented that show CMA can be verified and calibrated with accuracy of 0.015mm in 5 minutes by using the proposed method.
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