Hi-I lost my jewelers ruler and I thought instead of buying a new one (only come in packs of 10 through Rio)I'd try another method-I have a ring mandrel and rize sizer-the crazy keychain looking one, but I know there's another way to transfer the size onto the metal. Any suggestions?

Isabella

If you are looking for what length of metal to cut to form a certain size ring, you just need the circumference of the size ring you are making. There are lots of tables in books and on the web that can provide the circumference for a given ring size. Just remember that you need to add the thickness of the metal to the circumference to get the ring to close properly.

Here is an example of one such table on the web: http://www.marchenoir.com/ringsize.html

Looking up a size 6 ring for example, the circumference is 52mm. If you were using 18 gauge metal which is 1.02 mm thick, you'd cut a ring blank that is 53.02 mm (52 mm + 1.02 mm).

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Jim

Thanks Jim! I knew I was missing something!

I believe you will get more accurate results of determining cut length if you add the thickness of the ring shank (or any border strap) to the diameter of the ring size (or whatever) before you multiply times Pi (3.14).

QUOTE: Originally posted by MonsterSlayer I believe you will get more accurate results...

What a polite way of saying "You botched that one Jim!" [:)]

Circumference is equal to pi (3.14) times the diameter. So, if you need a size 6 ring, the diameter would be 16.4 (from the table in my post above). Multiplying by 3.14 we get 51.5 mm. But that would be in inside of the ring. Now if you were using 18 gauge metal your ring would be 1.02 mm thick. The diameter of the outside of the ring is the inside diameter plus the thickness, or 16.4 mm + 1.02 mm, which equals 17.42. Multiplying by pi (3.14) we get 54.64 mm.

So as you see, my above post was out there some where. Sorry for the bad advice Isabella. And John, thanks for being so delicate with my mistake.

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Jim

I suggest going to the resource center on the contenti site and downloading the pdf for ring blank sizing... it is easy to read, and the website has other good reference ingo too:
http://www.contenti.com/resources/index.html

Randi

Wow.. Glad Im dislexic...
I do the string, wire tape anything
cut it a little large make shape it into a C let it over lap a little.
saw through the overlap. joint is clean.
solder it then make it round.
normally i make them a hair small then as I round them I enlarge them to the size I want.


NO MATH for me[:D]

D

I was just planning on posting this same question...I knew I'd seen formulas before, but couldn't find them now that I'm ready to try a ring made with sheet metal! Though I do like your way best, d_leo_lion!

Hey metal workin' gurus ... I could use some help with a similar question ...

I want to make an anticlastic ring. How do I account for the shrinkage that the anticlastic forming will cause so that the ring will fit? Also, I'm guessing I should make a pattern, cut out the metal, then solder the ends of the metal together before forming ... is that how you would do it? I don't know if it matters, but I use a steel sinusoidal stake with a delrin hammer for forming and a delrin stake and steel hammer for planishing. Thanks in advance for your help!!!

Mollie