precision bearings requirements

Since the accuracy of precision bearing itself in less than 1μm, thus requiring its mating parts (shafts, bearing housings, end caps, ring, etc.) have a high dimensional accuracy and shape accuracy, especially with the surface to control the accuracy and bearing the same level, and this is a crucial point, but also the most easily overlooked.
Must also pay attention to match the mechanical precision bearing manufacturer  it is not the above requirements, often makes precision bearings in the bearing after installation error occurs several times larger than the original, or even 10 times more errors, fully become a precision bearings, because the match machine the error components are often not simply added to the error of the bearing, but on multiple amplified with different additions.