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Periodic and thorough maintenance and inspection are indispensable to drawing full performance from bearings and lengthening their useful life. Besides, prevention of accidents and down time by early detection of failures through maintenance and inspection greatly contributes to the enhancement of productivity and profitability. Cleaning Before dismounting a bearing for inspection, record the physical condition of the bearing, including...
It is important for enhancing productivity and profitability, as well as for accident prevention that abnormalities in bearings are detected during operation.Representative detection methods are described in the following section. 1）Noise checking Since the detection of abnormalities in bearings from noises requires ample experience, sufficient training must be given to inspectors. Given this, it is recommended that specific persons b...
In selecting bearings, the most important thing is to fully understand the operating conditions of the bearings. The main factors to be considered are listed below: 1.Installation space Bearing can be installed in target equipment When a shaft is designed, its rigidity and strength are considered essential; therefore, the shaft diameter, i.e., bore diameter, is determined at start.For rolling bearings, since wide variety with different ...
Bearings with diameters between 36 and 169 in. typically cost a lot and have long lead times, forcing end users to keep spare bearings on hand or face extensive downtime should a bearing fail. Therefore, it can make sense to replace a bearing before it degrades. Bearings removed this way often make good candidates for repair or refurbishment. But what qualifies a bearing as repairable? How are repairs carried out? And what kind of resul...
Massive rotors in hydroelectric generators, large ball mills, rolling mills, large electric motors, and steam and gas-turbine generators normally operate with great efficiency on oil films in sleeve and thrust bearings. But trouble arises when rotational speed is too low, as it is at starting and stopping, to generate a complete oil film. Then frictional drag and wear increase with metal-to-metal contact between the bearing and rotating...
Caged balls offer several benefits, ranging from minimized wear to reduced maintenance. Let’s look deeper into caged balls, their benefits, and design tips for success. Caged balls are widely deployed in motion systems throughout industry. Whether used in ball bearings, linear guides, or ballscrew actuators, caged balls bring both performance and practicality. The addition of the cage minimizes wear, reduces noise, and extends mainten...
For instrument bearings, certain special considerations should be emphasized: Heavy press fits should be avoided. Accuracy of mounting surfaces should be equal to accuracy of mating bearing surface. Misalignment for low torque and running accuracy should not exceed 1/4°. Loading across the bearing during assembly should be avoided. Axial positioning: Accurate axial positioning of the shaft relative to the housing requires shoulder...
Scoring and wiping are two common causes of oil-film bearing failure. Scoring is characterized by circular parallel grooves on the bearing lining surface and are heavier at the load zone. Wiping results in the displacement of babbitt from one location to another. If you see air-moving equipment, chances are oil-film bearings lie at the heart of centrifugal and axial fans. Serious damage can result to the entire unit should these bearing...
How long will a bearing last? Standardized life equations help to answer. Relative effects of contamination and lubrication condition on bearing life with different load levels. Experience shows seemingly identical rolling bearings operated under identical conditions may not last the same amount of time. In most cases, it is impractical to test a statistically significant number of bearings, so engineers rely on standardized bearing-lif...
Approximately 27,000 ceramic tiles cover the exterior of the NASA Space Shuttle—a reusable spacecraft that carries astronauts in a low orbit around Earth. Acting as a thermal barrier to the 1,650°C generated by atmospheric re-entry, the tiles illustrate the impressive resistance of ceramic materials. The impressive properties of ceramics are also being used in bearings. Ceramics are primarily used in bearings due to the material’s ...
