Dynamic Stiffness of Machine Tool Feed Driving System : 2nd Report, Experimental Evaluation on the Damping Capacity of Slideway

Abstract

A feed driving model facilitated with a hydrodynamic, a half-floating, or a hydrostatic slideway was prepared and its dynamic stiffness was measured under the condition that when a Coulomb friction acted on the slideway, an exciting force, and a feed rate were varied. It is verified that the previous theory can well explain the experiment, that is, the dynamic stiffness can be estimated quantitatively if an equivalent damping capacity is evaluated from the Coulomb friction during vibration, and that, for a practical application, this friction can be replaced by the one somewhat smaller than the steady friction force measured for a steady feed.