This study presents a simple methodology for capturing power consumption by acceleration and deceleration of feed drive on a vertical three-axis milling machine only using a High Speed Power Meter (HSPM). Because of configurations of axes and inertia, not only feed rate but also acceleration power consumption varies in each axis. Acceleration of feed drive brings about peak power and additional energy consumption. Peak power and additional energy consumption by feed rate can be estimated by 2^ order polynomial according to change of feed rate. For evaluation of developed model, some zigzag tool paths with different workpiece orientations were tested.