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GB1958—80《形状和位置公差检测规定》以最小条件作为评定形状误差的基本原则,但并不排斥其他评定方法,这在标准第10条有明确说明:“最小条件是评定形状误差的基本原则,在满足零件功能要求的前提下,允许采用近似方法来评定形状误差”。在其他评定方法中,最重要的是用最小二乘法评定,因为从误差理论的角度看,最小二乘法比最小条件合理:最小条件仅根据几个极值点(圆度、平面度为四点,直线度为三点)的变动量来确定评定基准的位置,而最小
GB1958-80 “shape and position tolerance testing requirements” to the minimum conditions as the basic principles of shape error assessment, but does not exclude other assessment methods, which is clearly stated in Article 10: "The minimum condition is to assess the basic principles of shape error , To meet the functional requirements of the parts under the premise of allowing the use of approximation method to assess the shape error. Among the other methods of assessment, the most important one is the least-square method because the least-squares method is more reasonable than the minimum conditions from the error theory point of view: the minimum conditions are based on only a few extreme points (roundness, flatness of four points , Straightness of three points) to determine the location of the assessment criteria, and the smallest