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Bearing life is too short or the premature loss of accuracy, to a considerable extent because there was no strictly according to the machine tool spindle bearings for installation requirements. In order to ensure the long life of SKF bearings, attention to common issues when we should be installed.
Must be cleaned before installing the bearings, bearings in the factory, in order to protect the Raceway and the rolling surface is corroded, between the raceways and rolling into the rust preventive oil or antirust grease. Therefore, must be cleaned with clean gasoline and kerosene, then coated with clean, quality, or can only be used for high speed and high temperature lubricants. However, some closed FAG bearings and coated with antirust dual-use grease for lubrication of machine tool spindle bearings, cleaning is not required. Effect of cleanliness on the service life of the bearing and vibration noise is very large.
(1) bearing a special orientation: in certain special cases, the shaft shoulder and fillet dimensions the installation dimensions listed in this directory cannot be determined, transitional washers as axial bearing can be used.
(2) the ring bearing spring orientation: NSK bearings subjected to axial loads small, high speed, shaft was shorter and processed into thread on the shaft under difficult circumstances, use rectangular elastic crosspiece positioning section. This method of loading and unloading is easy, the place, made simple.
(3) bearing thrust washer location: relatively short shaft, shaft neck is processed into thread with difficulty, high speed spindle bearings, axial load larger cases, positioning washers may be used, namely with the washer on the shaft end face with two or more screws are positioned, lock washer screw or wire to die to prevent loosening.
(4) the bearing adapter sleeve location: INA bearings speed is not high, bear a smooth little radial load and axial load in spherical roller bearings can be installed with tapered adapter sleeve on the shaft. Set form position nut and lock washer. Nuts lock tight sleeve friction bearing position.
You select the correct grease. Grease is made of base oils, thickeners and additives, different types and different brands of same kind of grease performance varies widely, allows limiting the rotation of different performance is determined by the base oil and grease, bearing lubrication performance thickening agent, thickening agent for water resistance water resistance of decides to grease. Low viscosity base oil suitable for low temperature, high speed, high viscosity suitable for high-temperature, high-load. Mixing of different greases is not, and even if it is the same the grease thickener, also brings bad influence because of different additives.
When you install the inner ring of the bearing, usually from shaft side fixed to the TIMKEN bearings installation when the bearing inner ring, generally by the shaft side fixed bearing positions, while the other side is for nut, lock washer and spring ring fixed. Shaft and axial dimensions of the fixed parts part contacts with bearing inner ring, bearings of all types in the table according to bearing size installation size.
Bearing positions, while the other side is for nut, lock washer and spring ring fixed. Shaft and axial contact parts with KOYO bearings inner ring size, press bearing bearing installation dimensions in the table size to determine.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7212BDF NSK | 60 | 110 | 22 |
| 7212ADF NSK | 60 | 110 | 22 |