The development of POSA aerostatic precision torsion is an important milestone for POSA to break through the traditional design structure. The R&D team uses gas pressure to obtain 1/1000 of the characteristics of ordinary lubricating oil, analyzes and calculates the structural optimization design of the internal air pressure flow channel of the torsion, and in the rotation and setting department Equipped with a load-bearing rigid air film between them. Demand for localization of components and other processing processes.