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Swivel-head bevel gear
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
The bevel gear mounted on the outside of the drive quill in the swivel head of hydraulic-feed, and/or some types of gear-feed, dia- 87 mond drills. the gear meshes with, and is driven by, a matching gear on the drill-motor shaft.
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Cable tools, английский
The bits and other bottom-hole tools and equipment used to drill boreholes by percussive action, using a rope, instead of rods, to connect the drilling bit with the machine on the surface. see churn drill.
Rod sag, английский
The bending of a long drill string due solely to its own weight. also called rod slack.
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