... finite analysis. Y-axis is driven by the servo motor, the ballscrews and double guideways with quick ... response. X axis is driven by 2 servo motors, the pinion-and-rack and linear ... reliable movement. Z-axis is driven by the servo motor, the ballscrews and the linear guideways. 2 ... system 840D features 4-axis control, the advanced digital AC servo system & motors and drive modules with easy ...