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Human sweat liquid acid a colorless or light yellow with a salty taste is weak, it PH values for the 5~6 in addition to containing sodium, potassium, calcium, magnesium salt, also contain a small amount of urea, lactic acid, citric acid and other organic acids when sweat and metal to metal contact, will form a layer of sweat liquid film on metal the surface membrane, sweat will cause the electrochemical action on metal, metal corrosion
In some special conditions, join the small amounts of solid lubricant grease, such as the addition of 3~5% 1 MoS2 can reduce wear, improve the compressive resistance ability, for the high temperature, high vacuum, elegant, corrosion resistance, radiation resistance, and very low temperature and other special conditions, the solid lubricant is added into the engineering plastic or powder metallurgy material in, can be made with thrust ball bearing parts and self-lubricating properties, such as adhesive bonding in the solid lubricant, raceway, cage and rolling body, form a lubricating film to reduce friction and wear, have a certain effect
Viscosity is an important characteristic of lubricating oil, oil film thickness and friction surface forming flow viscosity affects the lubricating oil of lubricating oil working temperature, the viscosity of the general thrust ball bearing is bearing 12-15cst higher speed should be selected lower viscosity, the heavier the load should be selected high viscosity commonly used lubricating oil machinery oil, high speed machine oil, turbine oil, compressor oil, transformer oil, cylinder oil etc.
Oil drip lubrication for quantitative supply of lubricating oil to bearing parts, oil drop weight every 3-8 seconds a drop for the Yi, excessive amount of oil will cause the bearing temperature increased
Thrust ball bearings installed in the host computer is completed, such as measuring the radial thrust ball bearing spindle runout, can be found in every round of measurements have some changes; continuous measurement, can be found after a certain speed, this change will be repeated approximation. A measure of the degree of this change index for cyclic rotation accuracy, change required to approximate repeats a few representative cycle of rotation accuracy of "cycle", in the quasi period quantity change of high amplitude, is the circular rotation accuracy is poor.
If the thrust ball bearing spindle to pre load the appropriate, will gradually rise to close to the speed of speed, in order to implement bearing "break in" effect, can improve the circulation of the spindle rotation precision.
2 a method of improving the accuracy of thrust ball bearing
Factory production of precision instruments, the spindle with 6202 / P2 type bearing and its accuracy can not meet the requirements, after the bold shaft neck and in its production to replace the inner ring raceway, and the steel ball are waxy density measurement, in size every three particle group, each group of steel ball and close to 120 ° spaced apart, because reduce the weight of machined surface, and reduced the weight of mating surfaces, but also increased the shaft bearing system stiffness, while the maximum three tablets with a minimum of three ball nearly equidistant distribution, but also improve the precision rotary shaft, and meet the requirements of the precision of the instrument.

Comprehensive checking method of installation accuracy 3 thrust ball bearing
The Timken bearing load thrust ball bearings, check order installation accuracy are as follows (the axis of the lathe of 60 - 100mm as an example):
(1) the measuring shaft and bearing seat hole size, to determine with precision bearings, with the following requirements:
The inner ring and shaft adopt interference, interference of 0 ~ +4 μ m (at light load, high accuracy is 0); outer ring and bearing seat hole by clearance, clearance is 0 ～ +6 μ m (but bearing in the free end of the contact angle of angular contact ball bearing, can also increase the gap); shaft and hole surface roundness error below 2 m, Timken bearing end the spacer parallel degree below 2 m, the inner surface of the end face of the shaft shoulder external jump under 2 μ m; bearing seat hole shoulder axis of the beating of under 4 μ m; spindle front cover end face the axis of the beating under 4
(2) fixed end bearing on the shaft.
Will wash with kerosene clean bearing a thorough cleaning, for grease lubrication, the organic solvent containing 3% ~ 5% of grease into the bearing cleaning, reoccupy gun will grease filled bearing (accounting for 10% of the volume of the bearing space ~ 15%); heating temperature 20 ～ 30 ℃ bearing make, use press the bearing in the shaft end; the locking sleeve on the shaft and to the appropriate pressure against the end face of the bearing so that the axial location; the spring balance tape in Timken bearing outer ring, pre load imposed by checking method of starting torque measurement is greatly change (even bearing right, but because the fit or cage deformation, pre load also could change).