Thermal Deformation and Its On-Line Compensation of Hydrostatically Supported Precision Spindle

Abstract The heat generation of hydorstatic oil bearings causes unsteady-state thermal deformation of spindle during rotation even though the temperature of oil supplied is strictlly controlled. A method is proposed in this paper to compensate such unsteady-state thermal deformation of hydrostatically supported precision spindle employing a feed-forward control scheme based on real time computer simulation of the thermal deformation process. A control system for compensation of tool-work relative displacement was constructed which consisted of personal computers and a piezoelectrically driven micro positioning mechanism. The test result presented proved that the system is effective.