抄録
Vibration induced by the residual unbalance of a spindle system that consists of a spindle and a tool holder is an important subject to accomplish higher efficiency and higher accuracy in a die machining with a machining center. Experiments have been made to examine the possibility of the measurement of a tool unbalance under the residual unbalance of the spindle system using both a balancing machine of one's own making and a higher speed machining center. It is demonstrated that the phase angle of the tool unbalance can be measured correctly. It is difficult, however, to measure the magnitude of the unbalance.
