Study on Compensation Mechanisms for Thermal Deformations of Machine Tools by Means of Added Piezo-electric Element (2nd Report): Compensation Coefficient

This paper shows : that the geometrical analysis leads to a physical meaning of the compensation coefficient Ki ; how the compensation coefficient Ki and Ci are influenced by changing the thermal capacity and material of the column part, through several experiments. As a result, Ki is the product of an equivalent length from the heat source neiborhood decided by machine shape and the coefficient of linear expansion of material. The experimental value of Ci disappears with the progress of time.