How to improve bearing measurement accuracy and error

1: How to improve the bearing accuracy:
1, the precision spindle bearings and can not meet the requirements, after the bold and the fabrication journal roller to replace the inner ring and ball were measured waxy close to a size for every three groups ball close to 120 ° intervals to take separately, due to a decrease of the surface of a re-processing, but also reduces the surface with a weight, while improving the axial stiffness of a bearing system, while the maximum 3 and minimum three balls close to the equidistant distribution also improve the precision of the axis of rotation, so to meet the instrument's accuracy.
2, bearing in host after installation, such as the measurement of spindle runout, can be found in each of its transfer of measured values have a certain change; continuous measurements, can be found after after a certain rpm, this change will be similar to repeated. Indicators measure the extent of this change for the cycle of rotation accuracy, repeated changes of approximately representative of the required rotation cycle of rotation accuracy of the "quasi-cycle", in the quasi-periodic change in amplitude value within the large, that is, poor circulation rotating accuracy . If proper pre-load spindle, the speed gradually increased to nearly working speed in order to implement bearing the "run" effect,
Can improve the precision of spindle rotation cycle.
2: Bearing error measurement:
In the choice of using bearings, be sure to pay attention to the error range. Do not understand the error standard bearings, leading to the choice of bearing is not working. Here I will briefly explain.
Import bearing measurement error, should the 10% tolerance. Exploits the difference in general measurement error of 10% to 33%, while with the tolerance level increased, the greater the proportion of errors, that is, the smaller the tolerance, the higher the proportion of errors, while the bearing tolerances up to IT5 more difficult to reach 10%. Measurement error does not mean that 10% of test tolerances can be relaxed, but to give some margin of safety to ensure that the standard user acceptance.

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