Error analysis of arc measure by CMMFang Binghong The 41^st Research Institute, CETC, Qingdao 266555Abstract:This paper analyzed the courses of measuring error in arc measurement by CMM（Coordinate Measuring Machine） from four aspects for the increasingly improved desire of manufacturing accuracy. The courses were arc measurement been instead of elliptic arc measurement, part＇s manufacturing errors,the non-corrected gauge probe radius and the sensitivity coefficient of the arc of small central angle. The corresponding solving methods were proposed for the courses. Thus these methods greatly decreased the measurement error, made measurement value more close to true value.[著者文摘]
Key words:normal vector; sensitivity coefficient; the arc of small central angle
