1. orifice:
　　(1) inner throttle to external throttle and instant mounting, table displays the upper and lower chamber pressure. Easy maintenance, in particular, can easily be cleaned on a regular basis, this is an internal restrictor can not be compared.
　　(2) throttle. Throttle than the theoretical values of β is between 1.2~1.5, and based on years of experience with 1.25 is a plus. Maintenance required spindle bearing geometry before and after the geometric precision, accuracy, coaxiality and taper and roundness is strictly controlled, to ensure that the beta value. E value is determined according to the machine′s load capacity (eccentricity of the spindle and bearing geometric centre), β-value best.
　　(3) the oil cavity are not loaded when the spindle, the outlet oil column must be consistent (observation), if not, change throttle aperture method should be taken, changing its flow. 4 cavities, for example, bottom, left, or right cavity between the oil column in 20~25mm, small hole diameter is 0.25~0.4mm.
　　2. thin-film feedback throttle:
　　Thin-film feedback throttle bearing stiffness is great, but the machine running also often hold w, napping, and so on. Film feedback it is essential that film, believe that in practice, Bush holds the leading causes of death, napping is: ① thin films induced by plastic deformation; ② slow feedback. When containing mutations, when films were still did not respond, shaft and Watts have friction; ③ film fatigue. Thin film using long fatigue deformation or change feedback parameters.
　　Increase film thickness and use some fatigue-resistant material, can achieve good results. Are generally adopting a rigid film, preload, reserved slot. In particular by: 1.4mm to 4mm thick film thickness of rigid film, following mat 0.05mm thick foil, spindle adjustment to a higher 0.05mm than the ideal location. Aim when the spindle force (wheel weight, cutting force), returns to exactly the ideal Centre.
　　3. improvement of oil supply system:
　　Static pressure in FAG bearings and oil system, in addition to the coarse filter and the fine filter, the rest of the components have a protective effect on hydrostatic bearing. On the basis of the original system to improve the fuel supply system.
　　(1) after the throttle plate and pressure gauge outlet pressure relay (in front of the accumulator), so as to allow the operator to see the cavity pressure and the size of the inlet pressure. When the pressure difference is greater than a certain value, in order to immediately shut down to avoid bearing lock. For example: import pressure 2MPa, oral 1.2~1.6MPa, down from 1.2MPa downtime.
　　(2) to increase the digital testing device:
　　Static pressure of FAG bearings 0.04~0.05mm clearance between spindle and bearing, in the course of the oil have a certain resistance, testing the resistance of the change, you can tell the gap size. A spindle pole, bearing on the other pole, measure its resistance to change. After this signal processing to the photoelectric alarms and control systems, amplifiers, control spindle motor start-stop in order to avoid the shaft friction with w.