| 单词 | Morisette expansion reamer |
| 释义 | Morisette expansion reamer [`mär·ǝ´set ik`span·chǝn ´rē·mǝr] MINING ENGINEERING A reaming device with three tapered lugs or cutters designed so that drilling pressure necessary to penetrate rock with a noncoring pilot bit forces the diamond-faced cutters of the reamer to expand outward, thereby enlarging the pilot hole sufficiently to allow the casing to follow the reamer as drilling progresses. |
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