| 摘要 |
A cylindrical cutter comprises a base, a generally cylindrical wall, and at least one cutting tooth formed at least partially in the cylindrical wall. The cylindrical wall includes a rim. The cutting tooth has a tapered portion extending beyond the rim. The tapered portion includes a root and a free end. The root of the tapered portion is joined to the cylindrical wall at the rim and has a thickness equal to the cylindrical wall thickness. The tapered portion has an overall taper angle from the free end to the root of at least 3°.
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