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Thread: Sizing of cast rings?

  1. #11
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    You result will be the clincher, Josef.

  2. #12
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    Wow, I would not expect anyone to cast rings just for testing, thanks a lot!
    Will be exciting to see the results!

    /Andreas

  3. #13
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    Just to add more to the confusion, when measuring - for instance - hot hands, or "time of the month" can make a difference of a size or two.

  4. #14
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    Click image for larger version. 

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    Raw castings trees

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    the wax model, 18 ct white gold, and platinum rings cut from the tree

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    The wax for comparison size N

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    Platinum raw casting M (ish)
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    White gold M(ish) bit of a wobbly cast that one !

  5. #15
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    Click image for larger version. 

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    Both rings with the inside cleaned up ready for hallmarking

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    Platinum M 1/2


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    White gold M 1/2

    Hope this helps

  6. #16
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    So Josef, the rings became about one size smaller after casting, but removal of metal when polishing the inside caused them to end up a half size smaller.

    This is what you predicted at the outset, when you said the wax should be a half size bigger than needed. However the The models made with a 3D printer are rougher than wax and need more finishing. So it is possible that rings cast from wax might need to start three quarters of a size bigger.

    Also heavier rings will shrink more, so will need a further estimated allowance.

    Thank you for clarifying the problem for us. I hope I have summarised it correctly. Dennis.

  7. #17
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    That Josef is a really useful demonstration of the debate, thank you for taking the time to do it, document it and share!!

    Very much appreciated

  8. #18
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    Hi Dennis that sounds about right,but I still would only go half a size on average size grown rings as depending on which direction the rings are grown on the machine the grow lines effect it differently,I dont have a formula for this it just seems to work out ok. But if you need to make the ring to a certain dimension say for example a 3mm band its better to have a bit of meat on it to finish to the correct thickness so I would add a bit to the outer dimensions

  9. #19
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    No problem Tabby glad to help. I just hope the ring fits Icarleug If Im in doubt I always go bigger at least she can put it on then get it resized as opposed to not putting it on and getting it resized !

  10. #20
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    Sep 2014
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