There are many classifications of CNC special-purpose machine tools. As far as the current Chinese market is concerned, the few main CNC special-purpose machine tools can have the following categories: 1. CNC stator curve grinder, 2. CNC internal grinding machine, 3. CNC Rotor groove grinder, 4. High-precision CNC servo valve sleeve grinder, 5. CNC ball-end grinding super-precision machine, 6. High-precision hydraulic valve sleeve grinder, 7. Deburring machine for precision parts, etc. There are many other types of CNC machine tools. There are also many innovative CNC machine tool models according to the sound field models of various CNC machine tools from different manufacturers. But in fact, for the use of these innovative models, users still need to make some investigations. After all, the new and innovative CNC machine tools still have certain instability in terms of technical stability and maturity compared with some classic machines. Not a professional in time, properly understand the classification of CNC special machine tools and the advantages and disadvantages of each category