[Jewelry making - Article 00649] - [Orchid] High Tech from the Dark Ages

[TheWildInside]

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Hey folks,

    I don't know if anyone would be interested in this, but there's a
    wonderful article in the Winter 2007/Volume 22/No.3 issue of
    (American Heritage of) Invention & Techology which is ultimately
    about work hardening metal, but which the article calls shot peening. 


    They begin the story by explaining that the first instance of this
    process (though a closely guarded secret at the time) was in the
    making of Spanish swords. If you were wealthy you would travel to
    Toledo where blacksmiths "had developed blades that were thin and
    lightweight and had beautiful proportions. They also could take and
    hold a keen edge. But most important, they had a characteristic
    unmatched by those from other sword makers: Toledo swords were so
    tough that they could be bent almost double, over and over, without
    breaking. That made them virtually indestructible in battle." 

    The story goes on to explain that it was in the manufacture of
    automobiles that the process used to make these swords was
    "rediscovered". Specifically in the use of steel shot to descale
    springs. 

    If you happen to teach, this would be a wonderful reading
    assignment. The closing paragraph says it better than I: 

        "The serendipitous rediscovery of this millennium-old peening
        process has given engineers a way to design parts that will
        accept higher loads, or to extend their fatigue life safely. The
        explanation of how the process works has led to a better
        understanding of how metals fail. Over the decades this knowledge
        has been the basis for many other improvements and cost savings
        in metal casting, forging, and fabrication technology. That's why
        I think that the basics of shot peening and peen forming should
        be required in all college mechanical, aeronautical, and
        structural engineering curricula." 

    Cool stuff. 

    This is a quarterly publication, so you should find it available on
    newstands for several months. There's a picture of Don Adams on the
    cover using his shoe phone (cover story is about the evolution of the
    cell phone). The title of the article is the subject line of this
    post. (They are online at www.InventionandTechnology.com - but it
    doesn't appear that the most current issue is uploaded yet).
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