An annular groove is arranged on an outer circular cylindrical surface of the brake disc.

在刹车盘外环柱面上有环形凹槽。

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For surface point measurement of large scale rotary object, a system based on circular cylindrical coordinate measurement is developed.

针对大型回转体型面测量问题，根据柱坐标机的测量原理，研制了大尺寸回转体型面点坐标及形心轴线测量系统。

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