Manufacturing error of cycloidal gear is the key factor affecting the transmission accu-racy of robot RV reducer.The digitized measurement method of manufacturing errors of cycloidal gear is proposed based on a gear measuring center using one-dimensional probe,which can quickly and accurately measure the manufacturing error of cycloidal gear.The theoretical tooth profile model and error measurement model of cycloidal gear were established,and the theoretical trajec-tory of the probe is calculated.Applying the precision measurement principle,the NURBS fitting of actual tooth profile and the optimal matching between actual and theoretical tooth profiles are adopted.Thus,the mathematical model of the accurate calculation and processing of manufactu-ring error is constructed,and the actual manufacturing error of the cycloidal gear is obtained by optimization iterative solution.The actual gear profile of cycloidal gear is measured on domestically JB45 gear measuring center,and the accuracy and effectiveness of the method are verified.
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