Abstract
Recently, in a spindle of precision machine tools, higher rotational speed, larger stiffness and higher accuracy of motion have been strongly required to achieve higher geometrical and dimensional accuracy of machined parts. This kind of spindle is usually supported by aerostatic journal bearings and reducing the run-out of a spindle in rotation becomes important for accuracy. Therefore, in this paper, the run-out of a spindle with roundness error supported by two aerostatic journal bearings with feed holes is numerically investigated. It was found that there were two run-out modes, translatory and conical modes, which were varied by the relative position of feed holes between two bearings.
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