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Sidearm
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
A short bar connected to, and extending outward at a right angle from, a drill column and on which a small diamond or other type of drill can be mounted. compare crossarm.
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Guide coupling, английский
A short coupling with a projecting reamer guide or pup to which is attached a reaming bit. a guide coupling serves to couple a reaming bit to a reaming barrel.
Starting barrel, английский
A short (12 to 24 inches) core barrel used to begin coring operations when the distance between the drill chuck and the bottom of the hole or to the rock surface in which a borehole is to be collared is too short to permit use of a full 5- or 10-foot-long core barrel.
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