This paper examines the scaling of the machine tool type air bearing spindles and investigates the concern that error motions may not scale with the overall size scaling of the spindle. If a scaled down spindle, or miniature machining spindle, does not improve in accuracy over a traditional size spindle, then there may be an optimum size for the machining spindle. Therefore, this paper speculates on how to estimate the optimum size air-bearing spindle for ultra-precision machining.
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