Represents ISO names for geographic locations (US-NC stands for North Carolina in the United States).

代表地理位置的ISO名称(US - NC代表美国北卡罗莱纳州)。

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Jack: We are learning about how to operate a real NC machine, this is new to us.

杰克：我们正在学习如何操作一台真正的数控机床，这对我们来说是新知识。

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It also tells us how to improve the spindle and the control system of CA6140 NC lathe.

阐述了CA6140普通数控车床的主轴系统的改进及机床控制系统的改造。

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