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1. Precision bearings match mechanical requirements
Bearing the same precision bearings, precision within 1μm, thus requiring its mating parts (shaft, bearing housing, end caps, snap ring, etc.) have high dimensional accuracy and shape accuracy, especially with the surface accuracy control level, this point is crucial, and also the most overlooked.
Must also pay attention to the precision bearings to match parts to reach above requirements, often several times larger than the original bearing error precision bearings after installation, even 10 times higher than the error, not become a precision bearings, the reason is to match the machine member error is often not simply superimposed to the error of the bearing, but at different multiples of the amplified plus go.
2. Precision bearings with
In order to ensure the bearing after installation does not produce too large deformation, must do:
(1) the vertical degree of the roundness of the hole of the shaft with the seat and a shoulder block in accordance with the accuracy of the bearing corresponding to requirements.
(2) is necessary to accurately calculate the amount of interference with the rotating rings, but also the right with the amount of accurate calculation of the fixed ring.
The rotating rings blanch the amount of interference to the extent possible should be made smaller. Ensure the working temperature under the influence of thermal expansion, as well as maximum speed of centrifugal force, so as not to cause the tight-fitting surface of the peristaltic or sliding. Fixed ferrule size and bearing size based on the work load, select a very small gap with interference fit, too loose or too tight is not conducive to maintaining the original precise shape.
(3) If the bearing at high speed operation, and higher operating temperature, should pay special attention to rotating rings can not be too loose to prevent eccentric vibration, as well as fixed ferrule with not a gap, so as to prevent the ferrule in deformation under load and excite the vibration.
(4) take small interference fit condition fixed circle to match the surface of both the high shape accuracy and smaller roughness, or cause installation difficulties and demolition more difficult, and will also need to consider the spindle thermal elongation .
(5) using the paired two angular contact ball bearing spindle, most of the load lighter, the amount of interference with such large internal axial preload will significantly larger and adversely affected. Spindle double row cylindrical roller bearings and tapered roller bearing spindle, its load is relatively large, so the fit interference is also relatively large.
3. Improve the actual accuracy of the method
In order to improve the the actual accuracy when the bearing mounting must not bearing deformation measurement methods and measuring tools, the actual size of the mating surfaces of the bearing bore and cylindrical precision measurement, the measurement of the inner and outer diameters the project to be measured, and make a comprehensive analysis of the measured data, this data, the precision worthy of bearing shaft and housing bore size of the installation site. When the actual measurement with the corresponding size and geometry of the shaft and housing bore should be in the same temperature conditions in the measuring bearing.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NA5906 NSK | 30 | 47 | 23 |
| NA5905 NSK | 25 | 42 | 23 |