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In order to compensate the thermal deformation of the ball screws due to the heat generated during operation, the ball screws are generally given tension load when the machine tools are assembled and shipped. Although this empirical practice has been widely adopted, the effect of tension load given to the ball screws is not clarified quantitatively. The present paper deals with theoretical and experimental analyses of the effect of the tension load on the thermal deformation of the ball screw and the deviation of the position of the nut. It has been clarified that there exists a position of the nut along the ball screw where its deviation is zero despite the thermal deformation of the ball screw, and this position is determined by the ratio of the rigidities of both supporting brackets. A practical method is also presented to reduce the machining error due to the thermal deformation of the ball screw.

A Study to Suppress Machining Error due to Thermal Deformation of Ball Screw of Machine Tools