1 deep groove ball bearings
    These bearings are generally used to bear radial load, because the clearance is not adjustable, so often used in less precision occasion without pretension, as ordinary drill spindle.
Angular contact ball bearings
    These bearings can withstand radial and axial loads, will cause the internal axial force due to the radial load, and hence into installation, its configuration "back to back", "face to face", "series" and " multi-joint "the pretension can increase the stiffness of the spindle. Such bearing contact angle of 15 °, 25 ° and 40 ° three, where the contact angle of 15 ° B7000CY type high-precision angular contact ball bearings is designed specifically for high-speed grinding spindle special bearings, the bearings in addition to the internal structure design change the outer rings and rolling elements are made of high-quality the electroslag bearing steel manufacturing. Cage materials for phenolic cloth laminated tube, the tolerance grades 5,4 and 2. Therefore, this type of bearing with high rotation accuracy and limit speed, friction, low temperature rise.
3 way thrust angular contact ball bearings
    Usually chosen 230,000 way thrust angular contact ball bearings, contact angle of 60 °, a seat with lubrication holes, two shaft washer, a spacer and two sets of steel ball cage components. After selecting the appropriate spacer height can be so that the bearing assembly having a desired pre-load.
    This kind of bearing can withstand two-way axial load, has a good rigidity, normal lubrication, low temperature rise, high-speed, and ease of assembly and disassembly, as a new structure, used for grinders, lathes, boring, milling, drilling spindle on often use double row cylindrical roller bearings group with.
4 double row cylindrical roller bearings
    Such bearings can withstand greater radial load and allows to have a higher speed. Two roller bearings arranged in a crisscross pattern, the rotation fluctuation frequency doubling of comparable single row bearings, a 70% reduction in the amplitude. Such bearing two forms: NN30/W33 NN30K/W33 two series bearing inner ring with ribs, cups are separable; NNU49/W33 NNU49K/W33 two series bearing outer ring with ribs, within Circle separable, which NN30K/W33 and NNU49K/W33 series of inner ring tapered bore (taper 1:12), compatible with the spindle taper journal axial movement of the inner ring, allows inner ring swell to less small bearing clearance or preload the bearings. The cylindrical bore bearings usually hot charging, made use of an interference fit to reduce the bearing clearance or preload to achieve the purpose. Inner ring the separable NNU49 series bearings, generally in the inner ring is mounted on the spindle and then for raceways finishing, to obtain a high accuracy of rotation of the spindle.
5. Tapered roller bearings
    Both radial and axial loads, double row tapered roller bearings can withstand two-way axial load. Tapered roller sliding friction between the child big end with the inner ring ribs, the ultimate speed tend to be lower than the same size cylindrical roller bearings. The hollow tapered roller bearing available oil cooling roller, so that the temperature rise is reduced, thereby improving the allowed speed. However, this bearing complex manufacturing processes, machine lubrication system requirements are higher, generally used only for the special requirements of horizontal spindle.


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