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Ring resizing?
On Feb 13, 1:17*am, Peter W. Rowe
wrote: On Thu, 12 Feb 2009 22:06:52 -0800, in rec.crafts.jewelry Jeweller wrote: If you do decide to resize by cutting and putting a piece in, one finger size is equal to 1.1mm In Australian ring sizes (assumed by your addy), that's correct (I assume. *but didn't look it up...) * But in U.S. sizes, one full size is 2.5 millimeters. If one is being very precise, I think it's actually 2.54 mm... *And then, since you cut the shank open to insert the piece, you can add another .25 mm to make up for the width of the saw cut. * Again, for real precision, remember that this length of stock is most accurately measured on the inside of the ring, at the finger or mandrel surface. *But actually measuring it on the inside is a pain in the backside. *Most people mark the ring, and the stock, on the outside surface. For fractions of a size, or a size or even two, the result is the stock is very slightly shorter, so the ring ends up a little bit tighter than the desired size. *That's perfect, since it allows you to clean up the solder and the addition, and mallet the ring properly round again, and the slight stretching that causes then gives you the desired end size. *But if you're making a ring more than maybe a size and a half, or two sizes, larger, you start to need to measure longer than that theoretical 2.5 mm per size, or the ring will end up significantly too small. *Practice will teach you how much to adjust. * The other way to do this which avoids the math is simply to cut the shank, slide it up a ring mandrel to the desired size, making sure the shank stays flush to the madrel while doing this. *Then use a divider to measure the resulting gap and mark your sizing stock to cut the needed insert piece. Peter From looking at the picture you've posted, the bezel surounding the agate is not holding the stone in place. I can see gaps on the outer edges which means you could probably soak the ring in a product called " Atack " and that will release the stone without hurting the agate at all. Agates are around 71/2 on the hardness scale so you wont hurt the the polish in any way. This would be the easiest way to approach this job as anyone not familiar with soldering the ring in wet sand or water most often overheats the shank and makes more problems then they'd like. Mark |
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