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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Default Puncture through sheet metal for tapping

As an alternative to PEM nuts, steel sheets can be assembled by
puncturing the lower sheet and tapping the short "tube" formed
by the ragged edges. What's the name for this technique ?

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André Majorel URL:http://www.teaser.fr/~amajorel/
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