CNC machine tools in order to adapt to the durable, stable, easy to tune, and other requirements may change in recent years, machine clip indexable cutting tool has been widely used, the number reached 30 percent in a 40% overall CNC tool, metal removal accounts for 80% to 90% of the total. 
From the cutting process can be divided into: 
     (A) turning tools, particularly round, bore, thread, cutting tools and other 
     (2) milling tool. 
     (3) drilling tools, including drills, reamers, taps, etc.; 
     (4) boring tool 
CNC tool compared with the general machine tools used in cutting tools, there are many different requirements, mainly has the following characteristics: 
     (1) rigidity (especially roughing tool), high accuracy, low vibration and thermal distortion; interchangeability for quick tool change; 
     (4) The tool should be able to reliably breaker or volume shavings, chips in order to facilitate the exclusion; 
     (3) high life, cutting stable and reliable; 
     (4) easy to adjust the size of the cutter, in order to adjust the time to reduce the tool change;