[Jewelry making - Article 00572] - Re: [Orchid] Article: Minimal Metalsmithing

[John Donivan]

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    Wow, I catch a wicked cold for a couple of days, and look what
    happens - an Orchid tornado!! Cool. There was a discussion here long
    ago about the nature of art, and is jewelry art?, and all that, and
    many of the same issues arose as are here now in the "Art Jewelry
    Magazine" fiasco. In a nutshell, it is "tolerance for me". To fire
    Nanz for stating her valid views on any subject related to her job is
    inexcusable - perhaps it's just that they finally found a reason?
    Personally, I think it's because these are people who think there's
    such an animal as "art jewelry" to begin with - like other jewelry
    isn't art? (if any jewelry is art to begin with, which is a whole
    nuther thing) It's an insular world, and it must be sad to live in a
    manufactured reality. But it's a way of pretending to be a big fish,
    I suppose. When you can see that jewelry is jewelry then you can
    grow. 

    More technically: 

>     There is a company that makes seamless wedding rings from powdered
>     metals. They need to be easily resizeable by the jewelers who sell
>     them. To make them they press the metal powder with 40 tons per
>     square inch to achieve 80% of theoretical density pre firing. Then
>     the preforms are placed in a high vacuum to remove water and other
>     contaminates before firing then fired in a controlled reducing
>     atmosphere. At this point they are at 95% of theoretical density.
>     They are pressed again and re fired to further close any pores.
>     After that final firing they achieve 99% of theoretical density
>     which 

    THAT is sintering. OMC is not truly sintered at all. Powder
    metallurgy and sintering are not one and the same - they are only
    related. 

http://www.donivanandmaggiora.com

 
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