Filings splash during the cutting of metal. The cutting of CNC precision machining PA parts is different from that of metal. It is like the process of pencil sharpening, with scraps winding around the cutter. During the process, scraps accumulate and temperature rises, and PA scraps will melt and adhere to the cutter. It is difficult to clean. The common solution is slowing down the cutting speed, lifting the cutter intermittently and adding coolant liquid. However, during the processing of PA, the scrap is filiform and tangled, and it cannot be washed away by the coolant liquid. Blower gun is more effective than coolant liquids. And we use high pressure blower gun to blow constantly to prevent the conglutiantion of nylon filament with the cutter.