When determining the positioning benchmark and clamping scheme, pay attention to the following three points:

Strive to unify the benchmark of design, technology, and programming calculation. Try to minimize the number of fixtures, and to be able to process all surfaces to be processed after a positioning. Avoid adoption of manual adjustment schemes. The fixture must be opened, and its positioning or clamping mechanism cannot affect the sword in CNC processing (such as a collision). When encountering such situations, you can use a tiger pliers or a bottom plate to draw screws. 4. How to determine the knife is more reasonable? What is the relationship between the workpiece coordinate system and programming coordinate system?

1. The knife point can be located on the processing parts, but note that the point of the knife must be the benchmark or the part where it has been processed. Sometimes after the first process, the knife point is destroyed by CNC processing, which will lead to the second channel, which will lead to the second channel. The process and the latter -to -knife point cannot be found, so when the first process is pairing, pay attention to set up a relative pairing position where there is a relatively fixed size relationship with the positioning benchmark. Original pair. This is usually located on the machine tool or fixture. The principle of its selection is as follows:

It's easy to find positive. Convenient programming. The error of the knife is small. It is easy to check and check during processing.

2. The original point of the workpiece coordinate system is set by the operator itself. After the workpiece is installed, it is determined by the knife. It reflects the distance between the distance between the workpiece and the zero point of the machine. Once the workpiece coordinate system is fixed, it generally does not change. The workpiece coordinate system and programming coordinate system must be unified, that is, during processing, the workpiece coordinate system and programming coordinate system are consistent