With the development of numerical control technology, the hydrostatic bearing is also widely used in machining centers, CNC machine tool spindle. YTO AG first engine plant, there are many static pressure and static pressure diamond boring head grinder, carried out some exploration and try to repair, and achieved a few experience.
　　1. grinder orifice restrictor
　　1). The internal throttle instead external throttle, and the installation of the upper and lower chamber pressure gauge real-time display. Make maintenance easy, in particular, can easily be cleaned regularly, this is an internal restrictor incomparable.
　　2). Throttle ratio. Throttle than the theoretical value of β is between 1.2 to 1.5, and 1.25 based on years of experience is preferred. Such maintenance, the need for precision spindle geometry before and after bearing geometric accuracy, concentricity, roundness and taper strictly controlled to ensure β values. Determine the value of e (eccentric amount spindle and bearing geometric center) according to the carrying capacity of the machine, so that the best value β.
　　3). Each oil chamber when the spindle is not installed, the oil port of oil each column must be consistent (observation), if not, should be taken to change the restrictor aperture method, changes in the flow rate. In the chamber 4 as an example, generally, the left, the right chamber of the oil column between 20 ~ 25mm, hole diameter 0.25 ~ 0.4mm.
　　2. grinders film feedback restrictor
　　Films feedback throttle bearing stiffness is great, but the machine in operation often appear to hold tile, brushed, lost pressure and so on. The film is the film most critical feedback, practice believes locking bush, brushed the main reasons are: ① film due to plastic deformation; ② slow feedback. When the external load mutation, the film did not react, the shaft and the tile has been friction; ③ film fatigue. Film using a long time, fatigue deformation, the equivalent of changing feedback parameters.
　　Increasing the thickness of the film and to switch some of the material fatigue, can receive good results. Generally rigid film, preload, reserve gap method. Specific approach is: 1.4mm thick film instead 4mm thick rigid film, the inferior vena pad 0.05mm thick aluminum foil, so that the spindle adjusted to the higher position than the ideal position of 0.05mm. The purpose is to force when the spindle (wheel weight, cutting force), the just return to the ideal center.
　　3. Improved grinder oil supply system
　　Hydrostatic bearing oil supply system, in addition to the coarse filter, fine filter, the remaining elements of the hydrostatic bearing has a protective effect. In the original system on the basis of the fuel supply system improvements.
　　1). Then pressure switch and pressure gauge in the throttle plate after the oil outlet (original accumulator front), so allows the operator to see the chamber pressure and the size of the inlet pressure. When the pressure is greater than a certain value, in order to immediately shut down, in order to avoid bearing locking. Such as: inlet pressure 2MPa, export chamber pressure 1.2 ~ 1.6MPa, 1.2MPa lower than would stop.
　　2). Increased digital detection device
　　Between the shaft and bearing hydrostatic bearing clearance 0.04 ~ 0.05mm, during which the oil has a certain resistance value, the resistance change is detected, it is possible that the size of the gap. To the spindle pole, bearing another pole, measure its resistance changes. Send this post to a photoelectric alarm signal processing and control system amplifier, controlling the spindle motor start and stop, in order to avoid friction axis and tile.