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概述了影响经济型数控系统工作精度的因素。应用光电编码器作为滚珠丝杠转角位置检测元件实现了半闭环补偿控制，提高了系统的精度。
Outlines the factors that affect the working accuracy of economical CNC system. The application of photoelectric encoder as the position detecting element of the ball screw angle realizes the semi-closed-loop compensation control and improves the precision of the system.