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我们制做一种专门为打深孔的加长钻头。此种钻头同钻杆焊接时,为了准确、方便地定出中心,我们自制了一种简易定中心工装(结构如图所示)。A孔为装入钻头部位。B孔
We made a special drill for deep hole drilling. When this kind of drill bit is welded with the drill pipe, in order to set the center accurately and conveniently, we made a simple centering tool (the structure is shown in the figure). A hole for the drill bit. B hole