Effect of a Variable Stiffness-Type Dynamic Damper on Machine Tools with Long Overhung Ram

Abstract

The paper reports the results of an examination into the performance of a variable stiffness-type dynamic damper which is intended to increase the cutting performance of machine tools with a long overhung ram. The spring stiffness of the damper is changed externally by adjusting the position of a damper mass. Investigation is made to establish a condition for tuning the damper to maximum efficency when changes in the length of the ram take place in cutting operations. The demanded damping properties are confirmed through the measurements of frequency and step responses. Therewith, results of cutting tests are presented, illustrating the degree of chatter elimination obtained by use of the damper.