Author(s)

G. Holroyd, C. Pislaru & D.G. Ford

Abstract

Identification of damping elements in a CNC machine tool drive G. Holroyd, C. Pislaru & D.G. Ford Precision Engineering Centre, University of Huddersfield, UK Abstract An understanding of the dynamic characteristics of a machine tool is a vital element in the control of the machine which has a direct affect on the precision of the machining which can be undertaken. The ways in which energy is dissipated, such as friction and damping, have a significant effect on the dynamic behaviour. This paper outlines an approach to investigating the dynamic characteristics of an axis drive on a CNC milling machine. The torsional behaviour of the motor, belt drive and ballscrew coupled with the axial movement of the table or saddle and the ballscrew nut were considered. The mechanical elements of the drive were modelled as point inertias coupled by springs and dampers using Matlab / Simulink. The undamped natural frequencies and their likely mode shapes were determ

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