The mathematical formulas for roundness measurement has been descussed firstly based on the tri-probe error separation technique.
详细推导出三测头误差分离原理用于测量工件圆度误差的数学公式；
The error separation technique of the sphericity is derived from that of the roundness, and analyzed in theoretically, due to the lack of the on-site measurement of the sphericity.
针对球度误差没有实现在位测量的问题，将圆度误差分离技术引伸到球度误差分离技术，并在理论上进行了探讨。
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