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Gemstones, Minerals & Fossils
Lapidary
Facet design alteration
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<blockquote data-quote="SneakyCuttlefish" data-source="post: 241390" data-attributes="member: 3340"><p>Hi all. Bit of a technical one so I am not expecting many replies. I have taken this design - <strong> <a href="http://www.facetdiagrams.org/database/files/pc16006.html" target="_blank">http://www.facetdiagrams.org/database/files/pc16006.html</a> - </strong></p><p>and have modified the crown angles in GemCad to suit a topaz. I chose this design because it best matches a rather tricky and quite large piece of rough I am working with. </p><p></p><p>Original design is RI 1.54 and I have changed it to suit an RI of 1.61 for topaz.</p><p></p><p>The result has yielded a number of crown angles that are below the the critical angle and many of these angles are in decimal integers. My facet head on the machine isn't accurate enough to match these angles with any kind of accuracy. Is it ok to round up and down for the close ones? Is this even going to work or am I just wasting good rough?</p><p></p><p>I have checked the design in GemRay and it seems relatively good. Is this software reliable?</p></blockquote><p></p>
[QUOTE="SneakyCuttlefish, post: 241390, member: 3340"] Hi all. Bit of a technical one so I am not expecting many replies. I have taken this design - [b] [url]http://www.facetdiagrams.org/database/files/pc16006.html[/url] - [/b] and have modified the crown angles in GemCad to suit a topaz. I chose this design because it best matches a rather tricky and quite large piece of rough I am working with. Original design is RI 1.54 and I have changed it to suit an RI of 1.61 for topaz. The result has yielded a number of crown angles that are below the the critical angle and many of these angles are in decimal integers. My facet head on the machine isn't accurate enough to match these angles with any kind of accuracy. Is it ok to round up and down for the close ones? Is this even going to work or am I just wasting good rough? I have checked the design in GemRay and it seems relatively good. Is this software reliable? [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Facet design alteration
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