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Helical interpolation combines the circular interpolation scheme for two axes described above with linear movement of a third axis. This permits the definition of a helical path in three-dimensional space.
螺旋线差补结合了环形差补两轴在第三轴上做线性运动这样来定义空间三维螺旋路径。
Parabolic and cubic interpolation routines are used to provide approximations of free-form curves using higher-order equations.
抛物线差补和立方差补法通过高次高程来实现自由曲线。
They generally require considerable computational power and are not as common as linear and circular interpolation.
这通常需要有强的计算能力，正因如此，他不如直线差补和环形差补常见。
Their applications are concentrated in the automobile industry for fabricating dies for car body panels styled with free-form designs that cannot accurately and conveniently be approximated by combining linear and circular interpolations.
他们主要用于汽车工业中具有自由风格的车身面，而这是线性差补和圆弧差补不能精确容易得到的
The most common application of numerical control is for machine tool control. This was the first application of NC and is today the most important commercially.
数控技术运用于数控机床，这是数控的主要应用。现在主要用于商业。
In this section we discuss the machine tool applications of NC with emphasis on metal machining.
我们仍讨论数控系统特别是金属数控车床。
