| 摘要 |
<p>The countersink to form a conical chamfer at the mouth of a bore hole has a conical chamfering head, on which three separate cutting plates are arranged, symmetrically, the cutting plates being fastened to the chamfering head, but removable and changeable. A compatible sharpening device permits the introduction and mounting of the cutting plates, wherein the sharpening device has the same form or shape as the countersink, so that it is easy to resharpen the cutting plates to their original specifications.</p> |
