[Jewelry making - Article 01145] - Re: [Orchid] Creating a cone

[Lena Marie Echelle]

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    Cones, like rectangles, triangles, etc., are geometric shapes and
    have simple mathematical solutions. There is no reason to suffer
    through experimentation on something like this! One of my favorite
    books on jewelry making is called Contemporary Jewelry, by Philip
    Morton. I got the 1976 edition a few years ago at a library sale for
    $1. 

    He outlines an excellent and very practical way to make cones in the
    appendix of the book. I paraphrase him heRe: 

    Draw a life size profile elevation of the cone (ie. if the cone is
    closed at the small end this "profile elevation" will look like a
    triangle). Get out your dividers and set one point in the top of the
    triangle (the closed end). Open the dividers until they meet the
    bottom edge of the triangle. Start to scribe an arc about four times
    longer than the base of the triangle (or the diameter of the opening
    of the cone). Take the diameter of the cone and multiply it by 3.14.
    This will give you the exact circumference of the opening of the
    cone, and it is how long the arc needs to be. Step off the distance
    by setting the dividers at a small dimension like 2mm along the arc.
    When you get to the correct circumference, use a straight edge to
    connect that point to the original point of the cone. Cut this shape
    out, excluding the original profile elevation, and roll it up to get
    your cone. 

    Obviously, you have to take into account the gauge of your metal and
    all of that. It's a little different if you want a truncated cone
    (like for a crown setting). You start out with a drawing of the
    truncated cone, but use a straight edge to follow the walls up to
    where the lines would meet. That is the point at which you set the
    dividers to draw your arcs. Apart from that, the process is the
    same. 

    Hope this makes sense! If you need drawings let me know and I'll put
    them in my blog. 

Lena Marie Echelle
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