| 摘要 |
<p>There is provided a cutting insert capable of boring or drilling without the formation of a prepared hole in a workpiece. A cutting edge includes a cutting edge portion extending from the outer peripheral side to the center axis side of a cutting tool body when the cutting insert is attached to a mounting seat , reaching a first plane including the center axis, and traversing from one side to the other side of a second plane which is perpendicular to the first plane and which includes the center axis.</p> |
