同时，这些刀具的平面角必须始终与螺纹形状的平面角保持一致。

Also, the plane angles of these tools must always be identical to those of the thread forms.

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使用手动和电动工具测量，切割，螺纹和弯管使其成为所需的形状。

Measure, cut, thread and bend pipe to required shape using hand and power tools.

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蜗杆的几何形状类似于机械螺纹，蜗杆的转动与一个渐开线导轨直线移动是相仿的。

The geometry of a worm is similar to that of a power screw.

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