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钳工在有毛坯孔的工件上划线时,需要在孔中打进一块木头(或铅)的圆心板,以便找出圆心来划线(主要是划待加工圆周),这是一件很不方便的事情,因为木头的两端要锯成弧形,直径的大小还要恰当。如果我们用附图所示的活动圆心板就很方便了,图中1是本体,两端共有三个调整顶螺2(尖端淬硬),旋转2可以适用于不同直径的毛坯孔。本体上可先备有一个洋冲眼 a,调整2使 a 接近于毛坯孔的圆
When a fitter marks a workpiece with a blank hole, he needs to insert a piece of wood (or lead) in the hole in order to find the center of the circle to be scribed (mainly to the machining circumference) Convenient things, because the ends of the wood to be sawed into a curved, the size of the diameter should be appropriate. If we use the activity of the center of the board shown in the figure is very convenient, the figure 1 is the body, there are three adjustable top screw 2 (tip hardened) at both ends, rotation 2 can be applied to different diameter blank hole. On the body can be prepared with a Yang Chong eye a, adjust 2 to make a hole close to the blank hole