S.Ramesh Babu,

Abstract-- In CNC machine tools, transient temperature variation in the headstock assembly and ball screw system are the major contributors for spindle thermal error. A high-speed ball screw system naturally generates more heat and results in greater thermal expansion, adversely affecting the accuracy of positioning. Consequently, the present study focuses on the development of new thermal error model, to reduce the thermal error in spindle lateral direction (X-Component of the spindle). The proposed novel approach is based on the development of a net thermal error model by the integration of individual error models developed for the headstock assembly and ball screw system. The individual models are developed using multi linear ridge regression technique. The contribution of each heat source on net thermal error is evaluated by the use of net thermal error and the mean thermal error. The developed net thermal erro