High-speed precision bearings are primarily used in high-speed rotating applications with relatively light loads, where high precision, high rotational speeds, low temperature rise, low vibration and a certain service life are required. They are often installed in pairs as support components for high-speed electric spindles and serve as key components for the high-speed electric spindles of internal surface grinders.

The service life of high-speed precision bearings is closely related to their installation; the following points should be noted:

1. Bearings should be installed in a dust-free, clean environment. Bearings must be carefully matched, and the spacer rings used must be ground. Whilst ensuring that the inner and outer rings and spacer rings are at the same height, the parallelism of the spacer rings should be controlled to within 1 µm;

2. Bearings must be thoroughly cleaned prior to installation. During cleaning, the inner ring’s taper should face upwards; the bearing should rotate freely by hand without any resistance. After drying, apply the specified quantity of grease; for oil mist lubrication, a small amount of oil mist lubricant should be applied;

3. Specialised tools must be used for bearing installation to ensure even force distribution; striking is strictly prohibited;

4. Bearings should be stored in a clean, well-ventilated environment free from corrosive gases, with a relative humidity not exceeding 65%. For long-term storage, anti-rust measures should be applied at regular intervals.

To improve the actual fitting accuracy during the installation of precision bearings, it is essential to use measurement methods and tools that do not cause deformation of the bearings. Precise measurements must be taken of the mating surfaces of the inner bore and outer diameter of the precision bearings. All relevant inner and outer diameter measurement parameters should be recorded, and a comprehensive analysis of the data should be conducted. Based on this, the dimensions of the bearing mounting locations on the shaft and housing bore should be precisely machined. When measuring the corresponding dimensions and geometric shapes of the mating shaft and housing bore, this should be carried out under the same temperature conditions as those used for measuring the precision bearings.

To ensure a high standard of actual fit, the surface roughness of the surfaces on the shaft and housing bore that mate with the precision bearings should be as low as possible.

When carrying out the aforementioned measurements, two sets of markings should be made on the outer circumference and inner bore of the precision bearing, as well as on the corresponding surfaces of the shaft and housing bore, on both sides adjacent to the assembly chamfer. These markings should indicate the direction of the maximum deviation, so that during actual assembly, the maximum deviations of the mating surfaces are aligned in the same direction. In this way, after assembly, the deviations on both sides are partially offset.

The purpose of making two sets of orientation marks is to allow for a comprehensive consideration of deviation compensation. This not only improves the rotational accuracy of each end bearing but also partially eliminates the coaxiality errors between the bearing bores and the journal ends. Surface hardening measures applied to the mating surfaces, such as sandblasting or inserting a precision mandrel of slightly larger diameter into the bore once, are all conducive to improving the fitting accuracy.