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Onsite Measurement of Sphericity Based on HighPrecision Sphere Grinder
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LIU Bing1,2,XU Liming1,2,CHAI Yundong1,XU Kaizhou1,LI Dongdong1
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(1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China)
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Abstract A new method of onsite measuring sphericity was proposed based on highprecision sphere grinding machine. The measuring basis and the automatic measuring instruments were setup based on the sphere grinding machine. The radius variation as well as corresponding longitude and latitude values of the measuring points evenly distributed over sphere were measured. The mathematical models of the spherical center coordinate and the least square radius were established based on the least square method. The least square sphere was then fitted by the measured values. The comparison charts of the measured sphere and the least square sphere were drawn. The onsite measurement of sphericity was achieved and the result shows the feasibility comparing with traditional micrometer based measuring method.
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Received: 23 January 2010
Published: 27 January 2011
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