Buyers Guide 2021

Focus on: Seals, Bearings & Lubrication Maintenance Matters The calculated life expectancy of any bearing is based on eight assumptions: 1.The bearing is of high quality and has no inherent defects. 2.The bearing is the right one for the job. 3.The dimensions of the parts working with the bearing, such as the shaft and housing seats, are appropriate. 4.The bearing is mounted correctly. 5.The correct lubricant, in the proper quantity, is always available to the bearing. 6.The bearing arrangement is properly protected (sealed). 7.The operating conditions are matched to the bearing arrangement. 8.The recommended maintenance is performed. protect it and the mounting position from contaminants, such as dust, dirt and moisture, until installation work has been completed. This can be achieved by covering or wrapping the bearing and machine components with plastic or foil. The importance of accuracy A bearing will only perform satisfactorily if its associated components are geometrically accurate and if the prescribed tolerances are adhered to. When measuring these, it is important that the components and the measuring instruments are at approximately the same temperature. This is particularly important where large bearings, and their associated components, are concerned. The right tools for the job When performing installation work, gloves should be worn, and carrying and lifting tools specially designed for mounting bearings should be used. Further to keeping operatives safe, using the proper tools will save them time and effort. A good dismount Likewise, there is always the potential to damage an otherwise good bearing during dismounting. Therefore, whenever possible, such operations should be avoided. However, if a bearing must be dismounted and it is intended for re-use: No part of the bearing should be hit directly. The dismounting force must not be allowed to be transmitted through the rolling elements. The bearing must not be heated with an open flame. After the bearing has been dismounted, it must be cleaned with a suitable solvent and dried carefully. All parts of the bearing, and especially the raceways, rolling elements and cage, should be inspected for wear or damage. If the bearing can be reused, it can be protected against corrosion with a thorough coating of grease, oil or an anti-corrosive fluid, and repackaged. As the old saying goes, if you look after your tools, then they will look after you. In the case of bearings, this duty of care begins with their mounting. Mounted correctly, bearings will provide many years of reliable service. *Mark Townsend is SKF’s service engineering manager.