Many users of precision spindle bearings have reported that the problem of too much noise during the use of angular contact bearings. After research, the editor confirmed that it may be caused by the following reasons: The first reason is that if the bearing is not careful during assembly, it may enter the Some small impurity particles, these impurities will be mixed into the grease of the bearing, causing the precision spindle bearing to generate friction during operation, thus making noise, so high-end bearing manufacturers will complete the assembly process in a dust-free workshop; There is a reason that is easily overlooked, that is, the lubricating grease of the bearing is insufficient. If the grease is insufficient, the bearing will generate a certain cavity, resulting in local oil-free friction, which will make a large noise. Therefore, the precision spindle bearing is in the process of grease injection. Be sure to strictly control the amount of grease injected, and prevent grease leakage during storage; the torque is accurate, and the rotation can be stable!