| 摘要 |
PURPOSE: A hole cutter is provided to efficiently remove broken pieces and chips while a hole is formed at a workpiece. CONSTITUTION: A hole cutter(10) is composed of a cylindrical body unit(20) having an open top, a shaft(70) extended from the lower end of the body unit, a central drill(50) installed at the center of the body unit and protruding into the open top, a plurality of cutting edges(30) formed at the open top at regular intervals, and a plurality of cutting tips(40,41,42,43,44). The cutting tips are coupled with the cutting edge.
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