In the mold production, programmers can greatly improve the efficiency of hsm process. In order to successfully achieve the purpose of high-speed processing and improve the spindle speed and reduce chip load, reducing the turning angle of the tool path to make it more smooth transition and other issues which are important considerations. However, nc programmers and machinists who are just staying on these issues, then they will find that not only will often cause tool breakage, there will be problems on some parameters of the problem, such as span, feed rate and cutting depth.      Any successful machinists and programmers will recognize high-speed machining is an essentially completely different processing methods. Maintain a constant cutting materials      In an optimized system, all operating elements, only lower than the peak capacity requirements they can play a little bit, there is no need to overload a play, which is what we should strive to achieve high-speed processing goals. To avoid damaging the tool during machining, processing speed and feed rate should be kept within the tool path can withstand the peak load. However, during all non-peak load operation, the speed and feed rate should be set in such a way: let the tool which may reach speeds below the speed limit. Throughout the cutting process, we want the tool to work within the scope of their edge threshold. That is, we want to cut material remains constant or maintain a constant state of chip load. If the chip load is unstable, it may occur in two situations: either the process damaged the tool, or is that the process is running too fast