位置公差,无论是定向公差,定位公差,还是跳动公差,都是研究几何要素相互之间关系的,或者说是研究被测要素与基准要素之间关系的。基准是确定被测要素的方向和位置的依据,离开了基准,要素之间就没有确定的几何关系,被测要素的位置就无从谈起。位置公差 Position tolerance, whether it is directional tolerance, positioning tolerance, or beating tolerance, is to study the relationship between geometric elements, or to study the relationship between the measured element and the reference element. Benchmark is to determine the direction and location of the measured elements of the basis, leaving the benchmark, there is no definite geometric relationship between the elements, the location of the measured elements can not talk about. Position tolerance