?Question p109）（
8.3.1 Numerical Control (NC)
?Controlling a machine tool using a punched tape or
stored program is known as numerical control (NC).
?用穿孔纸带或存储程序控制机床就是众所周知的数
字控制。
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?NC has been defined by the Electronic Industries
8.3.1 Numerical Control (NC)
Association (EIA) as “a system in which actions are controlled by the direct insertion of numerical data at some point. The system must automatically interpret at least some portion of this data.” The numerical data required to produce a part is known as a part program.@@
?电子工业协会定义NC为“通过在某一点直接插入数
字数据来控制其运动的系统。这个系统至少能自动翻译这些数据的一部分” 。按要求产生的数字数据即我们所知的一部分程序。
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?A numerical control machine tool system contains a
8.3.1 Numerical Control (NC)
machine control unit (MCU) and the machine tool itself. The MCU is further divided into two elements: The data processing unit (DPU) and the control loop unit (CLU).
?数控机床系统包括机床控制单元（MCU）和机床本
身。MCU可进一步分为两个部分：数据处理单元（DPU）和闭环控制单元（CLU）。
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?The DPU process the coded data from the tape or
8.3.1 Numerical Control (NC)
other media and passes information on the position of each axis, required direction of motion, feed rate, and auxiliary function control signals to the CLU.
?DPU(数据处理单元)处理纸带或其它媒介中的编码数
据并将关于每个轴的位置、运动方向、进给速度、辅助功能控制信号等信息传递给CLU(闭环控制单元).
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