[Jewelry making - Article 00547] - Re: [Orchid] Making micro mosaics

[JoJu428]

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>      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? 

    Dear Karen, Both things happen when you "deform" the strip into a
    circle. Thus the neutral zone, 1/2 way in the thickness is the
    diameter you would actually get if you calculate using the formula
    C=2piR or C=pi times D (2R=D). In the example you gave C=25.4mm (or
    1 inch) Thus D=25.4 divided by 3.14 (pi) or 8.09 mm. If you had a
    stone that measured exact 8.09 mm it would not fit into the opening
    but would rest on the bezel. 

    The following example will explain how to obtain the length of bezel
    material needed for any size stone. Assuming you have a 4mm stone
    and you want to cut a length of bezel material to exactly embrace
    your stone. For calculation purposes you are going to use a 1mm
    thick bezel material (obviously too thick for so small a stone, but
    makes for easier calculations). If you used the formula C (orL for
    length)=D X Pi your 4mm stone would not fit into the opening. You
    have to make adjustment for the compression that occurs to the inner
    section of the bezel. You must add the thickness of the bezel
    material to the size of the stone. Thus L=4mm+1mm X 3.14 or 5x3.14
    to get 15.7mm as length of bezel needed. The outside diameter would
    be 6mm or 4mm+ 2x the wall thickness. II--------II <----wall of
    cylinder stone 

    Rereading this I am aware that it may be a bit confusing and I will
    happily send you a diagram which would make this clearer if you
    like, since Orchid does not allow including one into the e-mail. I
    also have made up a chart showing the length of material needed for
    various size stones using different bezel thicknesses and can send
    that to you. I'm sure you will get many responses to this, but I HTH
       Joe Dule 


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