CNC turning accuracy is generally IT11-IT6, and the surface roughness is 12.5-0.8μm. During fine turning, it can reach IT6-IT5, and the roughness can reach 0.4-0.1μm. The productivity of turning processing is high, the cutting process is relatively smooth, and the tools are relatively simple. Scope of application: drilling center holes, drilling, reaming, tapping, cylindrical turning, boring, turning end faces, turning grooves, turning formed surfaces, turning taper surfaces, knurling, and thread turning