| 摘要 |
The present invention provides a reamer (10), which has a center axis and includes a single cutting edge (20), provided for a cutting part (14) that is arranged at a leading end side. The reamer (10) includes three guide pads (28, 30, 32) in the cutting part (14). The first guide pad (28) is formed so as to project to the side almost opposite that where the single cutting edge (20) is formed. The second guide pad (30) is arranged in one area (14c) of areas, along a peripheral face of the cutting part (14), that are located between the first guide pad (28) and the single cutting edge (20) and that are directed toward sides opposite each other, and the third guide pad (32) is arranged in the other area (14d). |
