This paper describes the analytical results of spindle displacement and excitation current in time and frequency domains, measured during the real-time simulation of regenerative chatter by using a magnetic excitation device. The measured vibration amplitudes were analyzed based on the stability lobes estimated from the spindle system compliance. The chatter frequencies were found to closely approximate the estimated values. In addition, chatter vibrations, the frequencies of which were not predicted, were observed at high cutting stiffness values. A shift in frequency was observed, wherein the chatter started at a higher frequency and shifted to a lower frequency.