数控系统制造商努力使程序中的运动指令尽可能简单。针对常用的运动方式，他们给数控用户提供了插补类型。
理解插补
比方说，在一句指令里主要移动一个直线轴。比方说要运动X轴至编程零点右方1英寸的位置，此时，给出指令X1（假定使用绝对编程方式）。运动过程中，机床会沿着笔直的直线移动（由于只有一个轴运动）。现在希望包含Y轴运动，运动至编程零点Y轴上方1英寸的位置（与X轴一起运动），这是试图用这个命令加工带锥度工件或对工倒角。要使数控系统沿着笔直的直线到达编程终点，必须使X轴和Y轴的运动完全同步。同时，如果运动过程中要进行加工，必须指定运动速率（进给速度）。这种运动需要直线插补。
CNC control manufacturers try to make it as easy as possible to make movement commands within the program. For those styles of motion that are commonly needed, they give the CNC user interpolation types.
Understanding interpolation
Say for example, you wish to move only one linear axis in a command. Say you wish to move the X axis to a position one inch to the right of program zero. In this case, the command X1 would be given (assuming the absolute mode is instated). The machine would move along a perfectly straight line during this movement (since only one axis is moving). Now let’s say you wish to include a Y axis movement to a position one inch above program zero in Y (with the X movement).
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