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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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History of drill sizes
You might also not that even though everything they have uses metric screws/bolts, there is not a single metric drill bit or tap/die that is metric.
Paul |
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