Abstract
Machining accuracy of machine tools relies on accuracy of the relative motions between workpiece and cutting tool. In case of the ultra-precision cutting, depth of cut is several micrometers. In addition, if the machining of high hardness materials is carried out, ratio of the cutting thrust force becomes large. Therefore, high thrust stiffness is necessary for the machine tool in particular. This study designed the spindle for ultra-precision machine tools. The designed spindle achieves high stiffness with the water hydrostatic bearings. In addition, it is expected that the higher bearing stiffness reduces dimensional error of machined workpiece. For preventing surface damage of the spindle parts, DLC coating is applied on a spindle rotor and inner surfaces of the casing. This paper presents feature and calculated performances of designed spindle.
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