钻一个洞，是在中央，这是一个心轴螺栓，使其余的加工操作可以执行。
A hole is drilled in the center and it is bolted to a mandrel so that the rest of the machining operations can be performed.
在电子天平使用地点调整地脚螺栓的高度，使水平仪内的空气泡正好位于圆环的中央。
At the place of installation, level the balance using the leveling feet so that the air bubble is centered within the circle of the level indicator.
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