Development of big company rivering bend went Japan a kind of new method that machines a mould, its efficiency raises 3 times than in the past. Use when rough machining " law of machine gun cutting " , adopt high speed feed namely, and the method of a kind of treatment with lesser approach. Use when finish machining " excess load machines a method " . Both union, make the bear of cutting tool is reduced, treatment is stable, cutting tool life is lengthened, treatment efficiency rises greatly. When using high speed feed to undertake rough machining, every tine feed is its cutting tool 2 ～ 3mm. This company machines a method newly to this kind already patent application. CNC Milling