?The CLU operate the drive mechanisms of the
8.3.1 Numerical Control (NC)
machine, receives feed back signals concerning the actual position and velocity of each of the axes, and signals the completion of operation.
?CLU控制机器驱动原理，接受关于每个轴实际位置
及速度的反馈信号，发出操作完成信号。
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?The DPU sequentially reads the data. When each line
8.3.1 Numerical Control (NC)
has completed execution as noted by the CLU,
another line of data is read. Geometric and kinematic data are typically fed from the DPU to the CLU and CLU then governs the physical system based on the data from the DPU.
?DPU 接着读取数据。当执行完每条线后，CLU做
上记号，再读取另外一条线段。几何数据和运动数据由DPU传递给CLU ，然后CLU 根据来自DPU的数据控制物理系统。
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8.3.1 Numerical Control (NC)
?Numerical control was developed to overcome the
limitation of human operates, and it has done so.
发展数控加工主要为了克服手工操作者的局限，它
也确实做到了这一点。
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?
8.3.1 Numerical Control (NC)
?Numerical control machines are more accurate than
manually operated machines, they can produce parts more uniformly, they are faster, and the long-run tooling costs are lower. The development of NC led to the development of several other innovations in manufacturing technology:
?
数控机床比手工操作机器更加精确，生产的零件更加一致，它们速度比较快，长期运行加工成本更低。数控机床的发展导致制造技术（领域中）其它几项创新的发展。
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8.3.1 Numerical Control (NC)
?Electric discharge machining ?Laser-cutting
?Electron bean welding
?电火花加工 ?激光加工 ?电子束焊接
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