Technical Difficulties:  

1) High size requirements: key parts position, parallelism, flatness, perpendicularity, symmetry, profile are within 0.003mm;

2) The assembly is difficult, and the assembly accuracy is high. A total of forty-five machines are processed, and the assembly size is large, and the tolerance is within 0.003mm;

3) The whole set of tooling processing technology includes CNC, grinding, turning, electrical processing, boring and grinding processing