FAG super-precision bearing product features

Achieve FAG accuracy level P4S: In rough terms, the bearing accuracy basically covers the DIN/ISO or ABEC standards. However, FAG's super-precision bearings exceed this range. In addition to the tolerances required to achieve P4 or higher accuracy levels, there are other properties that are not included in these standards. All important product performances of FAG super-precision bearings are in line with the P2 accuracy class. The same applies to the running accuracy and parallelism of FAG bearings produced according to the P4S standard. Therefore, the standard FAG super-precision bearings can be used in the design of bearing arrangements with the highest accuracy. (See tolerances for single row FAG spindle bearings, page 144)

  Suitable material: FAG super-precision bearings are made of high-performance materials. High material fatigue life and wear resistance are achieved through special heat treatment processes, so that under normal circumstances the bearings can operate in infinite life. The Cronidur 30 is particularly important material, and X-life ultra-precision bearings are made of it. Its unprecedented fatigue strength and corrosion resistance dramatically increase bearing life, allow higher contact stresses, allow higher rotational speeds, and significantly increase lubricant life. Today, for spindle bearings, hybrid bearings, for example made of steel bearing rings and ceramic rolling elements, have become a standard product. Ceramic rolling elements are also used in cylindrical roller bearings. The ceramic material used is silicon nitride, which can give full play to typical ceramic characteristics. With steel
  Compared to rolling elements, there are more advantages, such as: • Excellent frictional properties between steel and ceramics, greatly reducing 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 bearing's motion performance. • The ceramic ball has a low coefficient of thermal expansion. In the course of work, 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 rotational speeds.

  Lubrication Grease plays an important role in the entire bearing system. The use of grease lubrication or oil lubrication has a great influence on the system cost. The Schaeffler Group's goal is to allow and prioritize grease lubrication even at maximum speed. Lubricants must undergo a rigorous verification procedure before use. Calculations and suitability tests for specific application requirements, such as the temperature performance and running-in performance of high-speed rotating spindles, are very important throughout the entire process. The result of this complex process is that the technical parameters of the lubricant to be validated 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 so that they can be interchanged with other similar products on the market. FAG has the world's most mature and comprehensive range of high-precision bearings for machine tool spindles, representing the highest level of performance. FAG can provide bearings for almost all spindle designs on the market. Therefore, the choice of spindle bearings can meet most of the requirements of specific applications. The contact shape, material selection, surface quality, and lubricant feed characteristics of these types of bearings have the following advantages: • High accuracy • Excellent high-speed performance • High stiffness • Good seismic