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为了在有中心孔的轴端面划线,可将尖脚圆规的一只脚改成装配式的(见图)。先用同心尖脚确定尺寸,然后换上球头脚即可。
To mark the end of a shaft with a center hole, change one leg of the pointed compasses to a fitted one (see photo). First concentric tip to determine the size, and then put on the ball-head can be.