Abstract
Recently, various precision parts are produced by ultra-precision machining. For the ultra-precision machining, the precise rotation accuracy, high-bearing stiffness and thermal stability are required to the spindle of the ultra-precision machine tool. Thus, the water driven spindle was developed in previous research. This spindle has the rotor driven mechanism by water flow and has water hydrostatic bearings. However, in the case of actual ultra-precision machining, the rotational speed changes under the influence of cutting forces. This degrades the surface quality of the workpiece. In order to solve this problem, the mathematical model of the water driven spindle is developed and the rotational speed control system is proposed. Effectiveness of this proposed rotational speed control system was verified by simulation tests.
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