使用的刀具外形必须正好与要切削螺纹的轮廓一致，即三角形刀具必须用于三角形螺纹等等。
The form of the tool used must exactly coincide with the profile of the thread to be cut, i. e. , triangular tools must be used for triangular threads, and so on.
在切削实验中，可对切屑厚度、刀具磨损及螺纹等的形貌进行观察并测量其尺寸。
In cutting experiments, it can be observed and measured that the chip thickness, the tool wear, the screw thread teeth, and so on.
常见的共轭曲面包括齿轮的齿面、空间凸轮的工作面和螺旋面等，其中螺旋面被广泛应用于螺纹、蜗杆、螺杆泵及金属切削刀具等领域。
The common conjugate surface includes tooth surface of gear, working surface of solid CAM, helicoidal surfaces existing in spiral burr, worm, chip flute of cutters, and so on.
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