high speed bearing Improve Accuracy

After the high speed ‍bearings installed in the host, such as measuring spindle radial runout, measured values ​​can be found in each of its revolutions have some change; continuous measurements, can be found after a certain number of revolutions, the repetition of this change will be approximately appears. precision spindle bearings‍ Indicators to measure the extent of this change is cyclic rotation accuracy, approximately repeated changes in the number of revolutions required precision rotation cycle on behalf of "quasi-periodic" values ​​vary within a large amplitude quasi-periodic, cyclic rotation accuracy is poor .

If properly pre-load on the spindle, the speed gradually increased to nearly the speed of work to implement the "run-in" the role of the bearing can improve the accuracy of the spindle rotation cycle.

6 Install accuracy calibration method

After the angular contact ball bearing into the spindle, install precision calibration sequence is as follows (with shaft diameter of 60 100mm ordinary lathe for example):

(A) measuring the shaft and housing bore size, to determine with precision bearings, with the following requirements:

Take the inner ring and the shaft interference agricultural bearings‍ fit, the amount of interference 0 ~ + 4μm (at light load, when precision is 0); take the outer ring and the bearing bore clearance fit, clearance volume 0 ~ + 6μm (but at the free end of the bearing when using angular contact ball bearings, but also increase the gap); shaft and housing bore surface roundness error in 2μm or less, face parallelism bearing spacer used in the 2μm or less, the end face of the shaft shoulder end foreign beating in 2μm or less; retaining shoulder of the housing bore axis beating 4μm below; cover the front end face of the spindle axis beating 4μm or less.