1. The scale and accuracy of the scales (such as drill bit, re -cutter, key slot milling cutter, and round knife) directly affects the scale accuracy of the workpiece.

2. The shape accuracy of the shape of the molding tool (such as the molding car, the forming milling cutter, the formation sand wheel, etc.) will directly affect the shape and accuracy of the workpiece.

3. The blade shape error of the blade shape of the blade (such as the gear roller, the flower keys, the tooth knife, etc.) will affect the shape accuracy of the processing surface.

4. General knives (such as car knives, scoop knives, milling cutters), the production accuracy has no direct effect on the processing accuracy, but the tool is easy to wear.