Model knife review the specific installation location is under the die stamping parts of the structure of different shapes and reasonable arrangement, in order to check die accuracy, often under the die stamping parts of the structure and shape layout of two or more of the model knife, which makes model Knife different positions of its tilt angle is different, so people in the design of a mold inspection is usually first determine the model of a knife in the prosecution of a specific location, as shown in Figure 1 in accordance with the X, Y coordinate system to process a model knife. And we found that the production of poor flexibility in this way, if he feels that the original design is not ideal but want to move about the location of a knife model, then the model for a knife because of its inclination to change the model must be re-processing of a knife. In order to overcome this shortcoming, we have a knife in the processing model, when the original X, Y coordinate system into to the baseline as shown in Figure 1 for the new benchmark in the establishment of a user-defined coordinate system, so the location of a knife can be a flexible model has changed .