With scientific and technological development, the requirements for the material surface properties become higher and higher. In recent scores of years, different gaseous phase deposition technologies have emerged, research and application of surface engineering technology have made very rapid development. With the advantages of precise parts and fittings machining in Chang’an Town during fabrication process, the product quality is excellent. In the following, we will describe characteristics of precise parts and fittings machining in Chang’an Town:
　　1. The precise parts and fittings machining in Chang’an Town has strong adaptability and fine flexibility. It can machine part whose contour and shape are very complex or whose size is difficult to be controlled, such as mould parts, case parts and so on.
　　2. With precise parts and fittings machining, it can machine parts that cannot be machined or are difficult to be machined with ordinary lathe, such as complex curve part described with mathematical model and three-dimensional curved surface part.
　　3. The production automation degree is high, it can reduce the labor intensity of the operators, and is good for automatic production management.
　　4. Production efficiency is high.  
　　5. With precise parts and fittings machining in Chang’an Town, it can machine the part that requires many working procedures after being installed and clamped in place.
　　6. Machining precision is high, machining quality is stable and reliable.
　　7. From the cutting principle, for precise parts and fittings machining in Chang’an Town, end milling or peripheral milling is intermittent cutting mode, is not continuous cutting like lathe turning. Therefore, the requirements for cutter are fairly high, the cutter shall have fine impact resistance, toughness and wear resistance. Under dry cutting conditions, the cutter shall also have fine red hardness.