圆度是一项控制回转体横截面的形状公差。根据GB1183—80的定义,圆度公差带是在同一正截面上半径差为公差值t的二同心圆之间的区域。圆度误差的测量及其数据处理,国内外多限于采用二点、三点测量和运用圆度仪测量,前者具有精度低,后者具有价格昂贵等缺点。 Circularity is a shape tolerance that controls the cross-section of the rotor. According to the definition of GB1183-80, the roundness tolerance zone is in the same cross-section of the radius difference between the tolerance value of t between two concentric circles. Roundness error measurement and data processing, mostly at home and abroad to use two, three-point measurement and the use of roundness measurement, the former has low accuracy, the latter has the disadvantage of being expensive.