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 Post subject: Lapidary noob question
PostPosted: Sun Oct 25, 2020 12:49 pm 
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Is there software available that will determine potential re-cut options for colored stones which were originally fashioned by the legally blind?


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 Post subject: Re: Lapidary noob question
PostPosted: Sun Oct 25, 2020 1:56 pm 
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Barbra, I am not aware of any. I typically will evaluate a stone for recut based on the individual stone particulars. Then if needed can use Gemcad to measure L/W, angle changes, and more to determine a new cutting plan. This process can take some considerable amount of time when dealing with quality gemstone species. I hope someone comes along and points to software that can assist. In the thread about fully automatic faceting a similar discussion about color stones and plotting all the variables comes in play. Whether the stone is a poor commercially cut or as you stated the leagally blind, I would think any software would need assistance inputting stone dimensions and such.

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 Post subject: Re: Lapidary noob question
PostPosted: Sun Oct 25, 2020 2:13 pm 
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Thanks.
I was thinking along the lines of some diamond software that seems to do something like that with spectrographic imaging.
But maybe I dreamt it. :smt117


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 Post subject: Re: Lapidary noob question
PostPosted: Sun Oct 25, 2020 7:16 pm 
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Sarine Technologies makes such a machine for Diamonds. No reason it wouldn't also work on colored stones. But you would have to input your own results profiles as it optimises for diamond proportions.

Han Werner Wild says he has software for colored stone planning form scanned 3-D models, but he isn't sharing.


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 Post subject: Re: Lapidary noob question
PostPosted: Sun Oct 25, 2020 10:57 pm 
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You know, I think I was thinking (or dreaming) of GemCad.


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 Post subject: Re: Lapidary noob question
PostPosted: Mon Oct 26, 2020 2:14 pm 
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Our own member here Rej, has a fantastic program out called GemCutStudio. Runs on Windows and Mac.
I prefer it to GemCAD.

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 Post subject: Re: Lapidary noob question
PostPosted: Mon Oct 26, 2020 3:35 pm 
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Thanks Gene!!!!


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 Post subject: Re: Lapidary noob question
PostPosted: Mon Oct 26, 2020 4:21 pm 
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I prefer Gem Cut Studio by Rej also.

Speaking of Rej. Has anyone heard form him recently? I have been trying to get in touch by email and PM here on this site for about a Month. No response at all yet.


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 Post subject: Re: Lapidary noob question
PostPosted: Mon Oct 26, 2020 4:59 pm 
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For quite a few years I have been using a Sarin that will export scans in GemCad's ASC format, then opening it in GemCad and designing around the scanned gem.

Problems? Scans aren't as precise as you might think. Also, concave features are not scanned/represented properly.

But it is very helpful for recuts, and right now I am working on some pieces of rough I preformed and scanned, then designed around.

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 Post subject: Re: Lapidary noob question
PostPosted: Mon Oct 26, 2020 7:03 pm 
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abeck wrote:
But it is very helpful for recuts, and right now I am working on some pieces of rough I preformed and scanned, then designed around.


Does that help you increase yield? I find that on a well preformed stone I am just really just placing the facets on the stone when I cut and polish them. The problems in the stone are corrected, shape and proportions are all established in the preforming process. Recovery is very high from a close preform. I don't find I can run any of the computer programs to closer tolerances that I can cutting in real life from a good preform.

I was taught by my Idar friends many years ago that all the money is made or lost when preforming. Many of the bigger, better dealers in Idar still insist that with high value rough they preform themselves before giving stones to the cutters to lay the facets on. I also follow this protocol.

I think the real value use for a Sarin machine and planning software is to analyse the rough for sawing, and shaping like they do with diamonds.


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 Post subject: Re: Lapidary noob question
PostPosted: Sun Nov 22, 2020 9:49 am 
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I use GemCutStudio to help plan my recuts for really expensive stones and I also teach the technique for doing this in my new distance learning course, The Science of Gemcutting.

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 Post subject: Re: Lapidary noob question
PostPosted: Sun Nov 22, 2020 9:54 am 
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abeck wrote:
For quite a few years I have been using a Sarin that will export scans in GemCad's ASC format, then opening it in GemCad and designing around the scanned gem.


I'm toying with the idea of trying to get a Sarine scanner 2nd hand. Which model are you using?

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 Post subject: Re: Lapidary noob question
PostPosted: Wed Nov 25, 2020 8:16 pm 
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justinkprim wrote:
abeck wrote:
For quite a few years I have been using a Sarin that will export scans in GemCad's ASC format, then opening it in GemCad and designing around the scanned gem.


I'm toying with the idea of trying to get a Sarine scanner 2nd hand. Which model are you using?


Justin,

Sorry about the delay.

We have a Sarin DiaScan S, purchased in 2005.

Important stuff for me is the ability to export/save in STL (for CAD design work) and GemCad ASC formats.

Ours requires a hardware key, serial port, and an open slot for a special card. If this computer dies, I will be without... Best to make sure what the scanner needs in a computer first if buying used.

Good luck!

Allan

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Matrix 9/Rhino 5, 6, 7 Beta
REVO A (still hanging on...)
B9 Creator Core 5 Series XL
Indutherm MC-15


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