Natural diamond tools currently used mainly for copper and copper alloy and gold, silver, rhodium and other precious non-ferrous metals? Ultra-precision parts and special mirror finish? Such as VCRs disk, optical flat mirror, a polygon mirror and the secondary mirror, and other surfaces. But its crystalline anisotropy? The tool is expensive. Natural diamond tools currently used mainly for copper and copper alloy and gold, silver, rhodium and other precious non-ferrous metals? Ultra-precision parts and special mirror finish? Such as VCRs disk, optical flat mirror, a polygon mirror and the secondary mirror, and other surfaces. But its crystalline anisotropy? The tool is expensive. Performance depends on the content of PCD diamond grains and cobalt? Tool life for carbide (WC substrate) 10 to 500 times the tool. Mainly used for a variety of non-ferrous metals such as turning aluminum, copper, magnesium and its alloys, tungsten carbide and wear highly plasticized fiber materials, metal matrix composites, wood and other non-metallic materials. When cutting speed, feed rate and depth of cut depends on the processing conditions and the hardness of the workpiece material. Synthetic polycrystalline diamond compact (PDC) and application performance close to PCD tools? Mainly used in non-ferrous metal, carbide, ceramics, non-metallic materials (plastic, hard rubber, carbon rods, wood, cement products, etc.), composite materials and other cutting? Gradual replacement carbide cutting tools. Because diamond particles bonded to ask some residual metal and graphite? Bonding metal to which the state or were coalescing vein-like distribution will reduce tool wear and life. Besides the presence of solvent metal residues? Direct contact with the solvent metal and diamond surface. Reduce (PDC) antioxidant capacity and tool heat temperature? So cutting tool is not stable enough. Thick diamond tool manufacturing process complicated? Because of the low melting point between diamond and metals and their alloys with high interfacial energy. Diamond is difficult to be generally low melting point solder alloy infiltration. Weldability is poor? Difficult to produce complex geometries tool? So TDF welding tool can not be applied in high speed milling. Diamond coated tools can be applied to high-speed machining? The reason is that in addition to diamond coated tools have excellent mechanical properties outside? Diamond coating process capable of producing any complex shape cutter? For high-speed machining aerospace materials such as aluminum, titanium and difficult to process non-metallic materials such as graphite electrodes.