Excessive clamping: In the processing of precision machinery processing, the workpiece often needs to be clamped with auxiliary tools to avoid vibration during the processing of the workpiece. Therefore, when we are carrying clamps, we should select the clamping point according to the support point of the workpiece. At this time, adjust the clamping intensity at the position of the clamp point, and increase the contact area of the fixture as much as possible.

· Knife cutting: Due to the insufficient rigidity of the workpiece or tool, affected by the factors of the cutting force, the thickness of the workpiece deforms, which is called the phenomenon of the knife. The method of dealing with this phenomenon is to increase the sharpness of the blade blade and reduce the size of the blade and the friction resistance of the workpiece.

· Structural material: Because the rigidity and stability of the workpiece are relative, the amount of deformation is also relative to the complexity of the structural shape and the length and width. Therefore The probability of deformation. When designing, pay attention to assumption of the structure of the workpiece in a reasonable range, and the relevant process should be followed.