Grease life refers to the time that the bearing can work normally under the condition of proper amount of grease lubrication. Factors affecting life include: Grease quantity Grease type Bearing type Speed u200bu200bTemperature Mounting, operating and environmental conditions. The decisive factor in the life of the bearing set in most practical applications of super precision bearings is the life of the grease. The effect of bearing fatigue life is relatively small. can be found in Figure 5. Figure 5 applies to high-speed greases. Adverse operating and environmental conditions must be considered in the application, including moisture, vibration, or airflow within the bearing. In variable speed operation with different durations, the total grease life can be calculated by the following formula: Here, qi is the working time ratio, and F10i is the grease life at a specific speed in the tachometer. kf u003d 1 for FD, N10 and N19 kf u003d 2 for NN30 NNU49 kf u003d 0.75 for spindle bearings with a contact angle of 15 (C) kf u003d 0.90 for spindle bearings with a contact angle of 25 (E) kf u003d 2.50 for At 2344/2347n u003d rotational speed dm u003d average bearing diameter. Grease distribution run-in: The first correct operation of a grease-lubricated bearing has a great impact on the performance and service life of the bearing. For even grease distribution, intermittent start-stop operation is recommended. This prevents the contact surfaces from overheating and causing damage. During shutdown, the temperature between the bearing elements is regulated so that no preload damage occurs. We recommend installing temperature sensors as close as possible to the bearing outer ring to monitor temperature changes during grease break-in and subsequent continuous operation. Sustained temperature rise due to excessive preload must be avoided in all cases. Grease run-in is complete when the bearing temperature stabilizes. The run-in process should initially start and stop at half the maximum speed. Figure 6 recommends a grease break-in procedure for open and sealed spindle bearings. The grease quantity table 4 and the grease running-in process chart 6 are all provided with plastic shrink wrap cards made in DIN A5 format for workshop use. The running-in process consists of several start-stop operations performed at different speeds and durations, and the pause time after each run is particularly important. The number of start-stop cycles required depends on factors such as bearing size, number of bearings, limiting speed and bearing environment. If necessary, start-stop operation with longer running time and shorter pause time should be carried out until the temperature stabilizes. Minimal Oil Lubrication: FAG spindle bearings require only a small amount of lubricating oil. Assuming that all rolling and sliding contact surfaces are immersed in oil, the required oil volume is approximately 100mm3/h. Minimal oil quantity lubrication minimizes frictional power losses. When the spindle speed exceeds the speed range under grease lubrication, oil lubrication can be used. The standard lubrication method today is oil-air lubrication. The bearing table lists the limiting speeds achievable with minimum oil quantity lubrication. Lubricating oil according to ISO VG68 + EP standard, which means a nominal viscosity of 68 mm2/s at 40°C and an appropriate amount of extreme pressure additives. Practice has proved very suitable. Figure 7 gives guidelines for oil quantities when lubricating with minimum oil quantities. However, the flow of lubricating oil inside the bearing has a great influence on the amount of oil required.