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The cutter is uses the jacking cutting form, the center drill and the jacking cutting fission puts all in one load. The hilt inner cone and the drill rod coordination connects a center drill end to turn on lathe into the drill rod center spiral hole calmly to fasten the knife tube, the center drill gets up the cutting to be calm, and is equipped with a U shape in above to clamp, it was unmistakably the saddle block which cut has cancelled accurately and its extraction.
The opening knife mainly by the jacking cutter body, the fluctuation protective covering, the hilt, the center drill and so on is composed. The opening uses the jacking cutting. After the center drill first works the opening calmly, the trepanning tool tooth starts to cut.