Hello everyone,
Its been a while since I cried for help so thought I'd pop in and badger you all. So I've got another wedding ring commission same as before made from 9ct white. This time I would like to get it cast. So I want to make a 5mm wide band court shape but make it a little thicker than 2mm as the customer wants a bit more height. However he doesnt want it as high as 2.5mm. Also he wants it a little more round on the corners etc.
So my plan of action is to solder my 6mm x 2mm d shape silver wire down onto a 0.3mm sheet. cut the excess sheet off and file it back to the size of the wire. Then solder the ring to size, then sand down the sides of the wire to make it 5mm wide with a flat walls on both sides like the court shape. polish then send to casters to get cast in 9ct white gold.
So, how do I calculate how much shrinkage happens when its cast?
I cant get my head around whether its as simple as taking 4% off 2mm and 4% off 5mm to get a rough idea on how much you will loose or whether I have to calculate the overall volume of material....I'm confusing myself now.
Do I make the master to his size S then once its cast just bash it up to an S? Or make it larger to anticipate the shrinkage?
Or do I just make the ring bigger all around and then just take it off once its cast in white gold?
If anyone makes any sense of that then please feel free to answer, if not then I hope you have been amused by my ramblings.
Thanks
Jon
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