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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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rule scales, 3R 4R etc.
I know it's easy enough to lookup what rules with 3R or 16R graduations
are, but what do the 3, 4, 16 and whatever even really mean? What's the story behind this systems or naming convention? |
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