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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
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) Handy thing