NSK Bearings rotation sounds with a stethoscope and other tests, there is a strong metal noise, abnormal sound, irregular sound, etc. to clarify abnormalities. Its origins are smooth bad, bad precision shaft or bearing, angular contact ball bearing damage, foreign invasion and so on.

     1, the shaft and the bearing housing tolerances choice and control: NSK bearings are pressed into chamber turned by hand obvious "imperfections" sense, it may be too much tolerance of the shaft or shaft roundness bad. Such as bearings pressed into the bearing chamber should be flexible rotation after no sense block. If significant rotation is not flexible, it indicates that the shaft size is too large, tolerance to downward. So good control shaft and the bearing housing tolerance should also control the roundness, many domestic manufacturers only tolerance control, no roundness control.

     2, the assembly to prevent foreign bodies: Bearing mounted to the rotor can easily do balancing balancing generated when the iron filings into the bearing, so it is best to do before loading the bearing dynamic balancing. There are some manufacturers in order to facilitate assembly, the assembly in the bearing chamber coated with some oil or grease lubricant effect, but the operator is often difficult to control the amount, if the oil or grease in the bearing chamber accumulates more in the bearing rotation is easily along the shaft into the bearing. Bearing chamber preferably not coated with oil or grease, such as non-coated bearings shall not be have to control indoor accumulates.

     3, NSK bearing assembly methods: Because bearings are precision products, such as improper assembly very easy for angular contact ball bearing channel damage, leading to bearing damage. Bearing in the assembly should have a dedicated mold and can not beat the pressed into the shaft when the force only a small circle, the circle can only push a large circle force. Assembly requires the use of pneumatic or hydraulic, press-fit upper and lower mold to remain outside the state level, if inclined bearing channel will lead to damage due to power, leaving the NSK bearing guide ring.

     4, paint rust prevention: paint rust characterized by multiple in sealed-type motor, motor in the assembly sounds good, but put in the warehouse for some time, the motor becomes very abnormal sound, remove the bearing severe rusting. Many manufacturers will be considered a bearing problem, through our continuous publicity, and now the motor plant has been realized mainly insulating paint problems. The problem is mainly because the insulating paint out of the volatile acidic substance at a certain temperature, humidity, corrosive substances formed, the angular contact ball bearing channel NSK Bearings cause corrosion damage.