非标精密机械零部件加工中常用的小技巧：
Common skills in the processing of non-standard precision mechanical parts:
工件一般都是先定位再夹紧，但对于某些工件，因为夹紧会造成工件变形。因此，对于这样的工件我们首先要夹紧然后再定位，找到6个定位点，并找到限制它的自由度。
Generally, the workpiece is located first and then clamped, but for some workpieces, because clamping will cause workpiece deformation. Therefore, for such a workpiece, we first need to clamp and then locate, find six locating points, and find the degree of freedom that limits it.