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| Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Oil Rig Drills
Oil rigs seem to be capable of drilling holes inches in diameter and thousands of feet deep. They can keep these holes amazingly straight or deliberately curve them. How do they do this and what does the drill head look like? Jim |
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