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A novel extended methodology for chatter suppression in milling process by applying extal forced vi-brations to the workpiece in two orthogonal directions which are the feed and cross-feed directions.Both the regen-erative and forced chatter suppression during the milling process of flexible workpieces are investigated.Here,the workpiece is subject to a sinusoidal periodic force in the feed direction to disrupt the regenerative effect.Additional-ly,to minimize the forced chatter,the workpiece is subject to the periodic excitation force in cross-feed direction. This force is proportional to the magnitude of the estimated cutting force in cross-feed direction and has a phase op-posite to the cutting force to minimize the vibration amplitudes.The effectiveness of the proposed method is evalu-ated numerically and experimentally,for the spindle speed located in both the local minima and local maxima of the stability lobe diagram.The numerical simulations indicate significant suppression effect in terms of vibration am-plitudes,resulting in suppression of both the regenerative chatter and the forced chatter.Experiments were con-ducted by using a workpiece-mounted active stage composed of flexure hinges and driven by piezoelectric actuators. The experimental results agree qualitatively with the numerical simulations.The proposed method indicates a re-markable vibration reduction effect for both regenerative and forced chatters.