At this point the dial gauge extension is positioned exactly at a right Angle to the front face of the pinion head.

达到此点时，百分表加长杆正好与小齿轮头部的前面成直角。

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The gearing machine tool of the model Y3150E is modified and a new milling head is designed to cut the envelope tooth of the pinion using allelomorph method.

对Y3150E型滚齿机进行改造，设计出一新型的铣削头，利用对偶法加工小齿轮的圆弧包络线齿形；

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