[Jewelry making - Article 00013] - Re: [Orchid] Finding the center of circle

[JMDesignFIPG]

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Hi Karen.

    I am a goldsmith in the UK and I often have to find the centre of
    discs. The first thing you must buy yourself is a disc centre lining
    tool, they are not expensive probably only a few dollars, they are
    even easy to make for yourself. They are steel and consist of a right
    angle with a straight edge disecting the right angle so that you can
    scribe a line disecting the disc, and by turning the disc around and
    scribing a second line you have a dead centre where the line cross. I
    could send you a photo of my centering tool if you want. My second
    suggestion is for you to make a marking jig, I have made these type
    of jigs to speed up production when needed. Jig making method as
    follows:- 

    1) cut a square of base metal ( copper or brass ) slightly thinner
    than the disc thickness,then pierce out a perfect fit cavity circle
    for your disc size in the square centre. 

    2) rivet the square base metal to a smae size piece of thin tool
    steel ( rivet in each corner ). 

    3) do the geometry and find the centre of one disc, place in cavity
    and drill a hole in the steel 

    4) anneal the whole jig and drop in water when dull red hot, this
    will harden the steel. 

    5) clean up and you have a jig that discs will fit into while you
    can mark dead centre with your pendant drill. 

    Please let me know if you would like detailed sketches. 

I hope this all make sense, good luck, regards James
see my work here if you are interested
http://www.ganoksin.com/orchid/jmdesign.htm
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