| Ring size discrepancies in different materials [message #62902] Thu, 28 February 2013 00:29 UTC |
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Hi all just wondering if anyone else has had any size discrepancies in using different materials.
For example I ordered 2 rings, both from the same file 1 FUD and 1 Stainless. But on arrival the FUD shows X but the Stainless is a W.
So I tried another ring, test prints in WSF proved to be the same size as I had made on the file...but the Sterling print came back 2 SIZES smaller!
Effectively it seems I now have to order each model in each size and material to truly know what size it will be...that is, if it prints the same every time? At any rate...I'm not in a position to afford this right now :/
So I'm assuming its shrinkage in the casting process, but I thought I read somewhere this was taken into account and offset?
I know there's a lot of ring makers on here, would be good to hear how they manage this issue, particularly if they are being purchased by customers as one size and its being delivered as a completely different size
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| Re: Ring size discrepancies in different materials [message #62908 is a reply to message #62906 ] Thu, 28 February 2013 03:04 UTC |
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No, .stl.
I think this is perhaps unrelated.
All my WSF/FUD rings seem to come out accurate to my scale used in construction, just as soon as I get the same files done in Sterling or Stainless the inside diameters differ.
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| Re: Ring size discrepancies in different materials [message #62909 is a reply to message #62908 ] Thu, 28 February 2013 04:43 UTC |
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Check the accuracy in the material pages. Some materials are very "random" with no way to get exact prints, while others should be better and then you got a dud. Steel is +-2mm and silver +-0.125mm.
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| Re: Ring size discrepancies in different materials [message #62941 is a reply to message #62909 ] Thu, 28 February 2013 12:54 UTC |
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| stannum wrote on Thu, 28 February 2013 04:43 |
Check the accuracy in the material pages. Some materials are very "random" with no way to get exact prints, while others should be better and then you got a dud. Steel is +-2mm and silver +-0.125mm.
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So you're saying that the the sizes are inconsistent, even when using the same file and material? If so. that's worse than I thought.
1-2mm is quite a discrepancy when it comes to ring sizes, that would explain the Stainless...but why is the Sterling so out? 2 ring sizes is a fair bit more than the 0.125mm stated. 
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| Re: Ring size discrepancies in different materials [message #62949 is a reply to message #62902 ] Thu, 28 February 2013 13:56 UTC |
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Have you emailed service about the shrinkage of your silver ring? Stainless shrinkage is usually from the infusion process, which heats the metal, allowing gravity to take over. So it's harder to control.
The Mad Moder
michael@shapeways.com
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| Re: Ring size discrepancies in different materials [message #63071 is a reply to message #62949 ] Fri, 01 March 2013 23:37 UTC |
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Not yet...just wanted to see if this was a common issue first.
If the discrepancies are consistent then its not so bad as I will adjust sizes for the material, if not, then its a lot of moving goal-posts all of a sudden :/
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| Re: Ring size discrepancies in different materials [message #63182 is a reply to message #62902 ] Mon, 04 March 2013 13:43 UTC |
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Email service, and they will tell if exactly if it's to be expected or not. Stainless is the only material I'd expect major shifts of up to 2mm, and even then I haven't seen that big of a shift on my own items.
The Mad Moder
michael@shapeways.com
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| Re: Ring size discrepancies in different materials [message #63322 is a reply to message #62941 ] Wed, 06 March 2013 01:30 UTC |
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My read of the accuracy between WSF and Silver says there would be .307mm possible difference between a ring size 12. This is .15mm WSF accuracy + .15% * 21.39 + .125mm accuracy of silver. So a size 12 ring could become 11.5 ish. or if it breaks the other way it could be 12.5
I'm doing a fair bit of ring printing right now so I'll try some WSF version of the silver process and see how close they are and report back. Likely will take about a month to collect data. I also suspect polishing will have some affect as well. Not sure I've got the budget to do all the variations but I'll report what I do.
Director 3D Tools
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| Re: Ring size discrepancies in different materials [message #64400 is a reply to message #63322 ] Tue, 19 March 2013 00:51 UTC |
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Thanks for that, be interested to see your results.
I will ask and see what they say.
Its been pretty disappointing as much of my latest orders, although printed well, came into size differences...not just rings, but bezel settings for stones were undersized too 
What I would really like to know is if these discrepancies are CONSISTENT...then I could offset the original file until I get it right. A few fractions of a mm might not seem much to some, but if you are trying to sell these to people as specific sizes, then 2 sizes out may not be acceptable to some?
[Updated on: Tue, 19 March 2013 00:53 UTC]
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