| 摘要 |
PURPOSE: A round bit is provided to improve work efficiency by reducing tool replacement time and to enable precise rounding work by forming cutting blades in various sizes. CONSTITUTION: A round bit comprises a bit coupling portion(10), a cutting portion, multiple cutting tip coupling portions(22), and cutting tips(30). The bit coupling portion is engaged with a rotary tool rest. The cutting portion for a rounding work is integrally formed on the bottom of the bit coupling portion. The cutting tip coupling portions are formed along a cylindrical tool body(20) under the bit coupling portion, and multiple cutting tips are coupled to the cutting tip coupling portions. Multiple round cutting grooves(32) are formed in the cutting tip coupling portions and cut the edge of a workpiece in a curved shape. The cutting tips are detachably screwed on the round cutting grooves.
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