Abstract
This paper presents a method of micro-vibration control of milling machine heads by use of a vibration absorber. The principle used in this paper is different from that of usual absorbers. An auto-tuning vibration absorber is presented in which the absorber creates anti-resonance state. When the anti-resonance is used, the damping has to be significantly small, so it is difficult to suppress higher modal vibrations. In order to suppress higher modes, an auto-tuning magnetic damper is used. It damps higher modal vibrations, but it also increases the principal vibration. Then a method of optimal auto-tuning control is presented in which both principal and higher modal vibrations are suppressed. Experimental tests are carried out for an actual milling machine, and cutting tests are also performed.