[Jewelry making - Article 00335] - Re: [Orchid] Making Micro mosaics

[Ian W. Wright]

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    Hi Karen, 

>     Let's say I have a strip of metal that is 1mm thick and precisely
>     1" long.    If I form that into a circle, which circumference is
>     precisely 1" - the outside, the inside, or the mid-point between
>     the two?  In other terms, does the outside surface "stretch" or
>     does the inside surface "compress" when forming the circle? 

    I think you will find that the correct technical answer is that the
    1" circumference is approximately 1/3 of the way out from the inside
    surface. This is because metal tends to stretch more easily than it
    compresses. This is, of course, all pretty theoretical as, in the
    real world, the actual dimensions are affected by a number of
    variables - the accuracy and angle of the cut ends, the evenness of
    the temper of the material etc., etc.  For this reason it is usual,
    except in a very few cases, to make and ring under size and then
    expand it to size. 

Best Wishes,
Ian
Ian W. Wright
Sheffield  UK


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