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当大工件上有很多地方需要用中心铳沿十字线打中心时,可用一如附图的木块,该木块呈正长方形,在一侧面的正中间开一端正的V形槽,然后用两根橡皮带把中心铳绑在槽中,
When there are many places on large workpieces that need centering along the crosshairs, a piece of wood as shown in the drawing can be used. The block has an exactly rectangular shape with a positive V-shaped groove in the middle of one side and two The root rubber band to tie the center 铳 trough,