Reaching FAG accuracy class P4S: Roughly speaking, the accuracy of the bearing is basically covered by the DIN/ISO or ABEC standard. But FAG's super-precision bearings go beyond that. In addition to the tolerances required to achieve an accuracy class of P4 or higher, there are other properties that are not included in these standards. All important product properties of FAG super precision bearings conform to the P2 accuracy class. The same is true for the running accuracy and parallelism of FAG bearings produced according to the P4S standard. Therefore standard FAG super-precision bearings can be used in the design of bearing arrangements with the highest precision. (See Tolerances for Single Row FAG Spindle Bearings, page 144) Suitable Materials: FAG Super Precision Bearings are manufactured from high performance materials. High material fatigue life and wear resistance are obtained through a special heat treatment process, so that the bearings can normally operate with unlimited life. Cronidur 30 is a particularly important material, from which X-life ultra-long-life super-precision bearings are made. Its unprecedented fatigue strength and corrosion resistance greatly increase the service life of bearings, allow higher contact stress, higher allowable speeds and significantly increase the service life of lubricants. Today, spindle bearings, such as hybrid bearings consisting of steel bearing rings and ceramic rolling elements, are a standard product. Ceramic rolling elements are also used in cylindrical roller bearings. The ceramic material used is silicon nitride, which gives full play to the typical ceramic properties. Compared with steel rolling elements, there are many advantages, such as: Excellent friction properties between steel and ceramics, which greatly reduces the stress of materials and lubricants in hybrid bearings. The low density of the ceramic reduces the centrifugal force of the rolling elements and improves the motion performance of the bearing. Ceramic balls have a low coefficient of thermal expansion. During the working process, the change of temperature has little effect on the change of bearing preload. The above factors greatly extend the life of the bearing. Therefore, ceramic ball bearings are often used even at low speeds. Lubrication In the entire bearing system, grease plays an important role. Whether you use grease or oil lubrication has a big impact on system cost. The goal of the Schaeffler Group is to allow and prioritize grease lubrication even at maximum speeds. Lubricants must go through a rigorous validation process before they can be used. Calculations and suitability tests for specific application requirements, such as temperature performance and break-in performance of high-speed rotating spindles, are important throughout the process. The result of this complex process is that the technical parameters of the lubricant to be verified are verified, and its exact suitability is guaranteed by continuous testing. FAG spindle bearings are single row angular contact ball bearings with high precision. The dimensions are standardized and therefore interchangeable with other similar products on the market. FAG has the world's most mature and comprehensive product range of high-precision bearings for machine tool spindles, representing the highest level of performance technology. FAG can supply bearings for almost all spindle designs on the market. Therefore, the selection of spindle bearings can meet the requirements of most specific applications. The contact shape, material selection, surface quality and lubricant feed characteristics of this type of bearing have the following advantages: high precision, excellent high-speed performance, high stiffness, and good shock resistance.