[Jewelry making - Article 00847] - Re: [Orchid] Ring around the rosie

[Brian]

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>     Is there a chart that indicates the length of metal I would
>     have to saw out for a particular ring size? And, should the length
>     be exact, or longer/shorter than denoted? 

    It's maths up to a point. Calculate the circumference from the
    diameter: it's a formula. You could make up a spread sheet and show
    each size in both dia and circumf. 

    But you must add a little extra for the physical effects of bending
    a strip of metal to a ring shape. People differ in their ways of
    calculating this, but a simple way would be to make the ring a
    little too small and stretch it up.

>     Is there a chart that would enable me to figure out total
>     surface weight without actually weighing something? For example, a
>     1 x 1 inch of whatever gauge sterling silver always weighs X grams. 

    It's also called density and specific gravity. Silver (fine) has a
    density of (approx) 10.5 grams per cubic centimetre. 

    Silver = 10.5 g/cm3
    Wax = 1 g/cm3 (approx)

    So take a 1" cube of wax and weigh it. That SAME SIZE would weigh
    10.5 times in silver. 

>     Are there any pitfalls I need to avoid when making a
>     ring/hollow ring? 

    Yes. Make a little hole for the acid pickle to exit out of. 

Brian
Auckland NEW ZEALAND
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