| 摘要 |
A tool and method for cutting a circular opening and retaining the cut portion. The tool comprises a shaft having at least one cutting thread and at least one tapping thread, or at least one cutting thread and at least one male screw thread, or only at least one tapping thread, or only at least one male screw thread, or a cutting tip and at least one tapping thread, or a cutting tip and at least one male screw thread, and a cutting member having at least one cutting bit radially displaced from the shaft. The shaft and the cutting member have a mutual rotational axis. An alternative tool has a spaced distance on the shaft between the cutting member and the at least one cutting thread and at least one tapping thread, or the at least one cutting thread and at least one male screw thread, or the at least one tapping thread, or the at least one male screw thread, or the cutting tip and at least one tapping thread, or the cutting tip and at least one male screw thread. The tool is either one integral piece or it is assembled from at least two separate pieces adapted to fit together. The at least one cutting bit can be saw teeth or grit particles. A method of using the tool by inserting the shaft into an existing pilot hole or drilling a pilot hole, and by maintaining the shaft within the pilot hole while cutting the circular opening.
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