1, INA bearings in the host after installation, such as measuring spindle run out, can be found in each of its transfer of measured values ??have some variation; continuous measurements, can be found after a certain number of revolutions, this change will approximately repeated. Indicators measure the extent of this change cycle of rotation for the accuracy, similar to repeated changes in the number of revolutions required for precision rotation cycle on behalf of the "quasi-periodic" in the quasi-periodic change in amplitude value within the large circle rotation accuracy is poor .If the spindle proper pre-load, the speed gradually increased to close to the operating speed in order to implement INA bearings "run" function, can improve the accuracy of the spindle rotation cycle.
   2, precision instruments factory trial, INA bearing spindle with 6202/P2 type and its accuracy can not meet the requirements, after the bold on the journal and its production to replace thinner ring raceway and the ball close to waxy measurement, in size every three groups, each taking the ball close to 120 ° intervals separated by reducing a heavy machined surface, but also reduce the surface with a weight, while improving the axis of an INA bearing system stiffness, and the largest three particles close to the minimum three balls equally spaced, but also improve the accuracy of the axis of rotation, so the accuracy of the instrument to meet the requirements.



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