Post subject: Re: From the GPU - post your GemCAD design requests here!
Posted: Sat Aug 12, 2017 11:42 pm
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Joined: Sat Aug 25, 2007 10:06 am Posts: 358
Alex Edwards wrote:
This is how the Mehenge garnet turned out. This is the "Beginner Pear" design by Michiko Huynh. It ended up being .75 ct.
Well that came out lovely, didn't it? Beautiful color, and lights up nice, too! Why isn't that in a setting! The pendeloque that I'm considering with a L/W 1.71 will better optimize the yield from the piece of rough I have, though.....
Post subject: Re: From the GPU - post your GemCAD design requests here!
Posted: Sun Aug 13, 2017 2:52 am
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Joined: Fri Dec 25, 2015 8:31 pm Posts: 276
micra wrote:
I am looking for a pear design for ruby laser rod... I like old fashioned as opposed to modern cuts... about to go dig out the Long and Steele books but thought I'd throw out this request as a possibility also: the Ikeda Acorn (gemology project) with crown and pavilion angles optimized for sapphire. ? Also interested to entertain other suggestions...
Scaling C2 on Ikeda's Acorn from 48 to 55 degrees, and P4 to 38 degrees should give you a better pattern. My BOG VM is a bit unstable right now so I can't really do a full optimisation on the design.
If you have the depth for Utopia but don't want to cut such small barion facets, Superpear 96 is my recommendation, though you will want to scale tier 2 to 39 degrees, and tier C to 37 degrees.
As for Steele's Pendeloque, I'm not sure I follow, is the translation for the first angle in the instructions? I'm only getting a light return of 40% at the angles you gave me, and there is a lot of windowing at the sides of the design.
Post subject: Re: From the GPU - post your GemCAD design requests here!
Posted: Sun Aug 13, 2017 10:10 am
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Joined: Tue Nov 04, 2014 12:12 pm Posts: 180
Here you go Micra - http://www.facetdiagrams.org/database/f ... 05101.html I'd adjust the angles a bit in Gemcad ie. Pav 1 42.40 to 43.36, Cwn A 38.50 to 41.55, obviously letting the other angles adjust accordingly. That gives a nice broad performance curve in Gemray (RI 1.76)
Post subject: Re: From the GPU - post your GemCAD design requests here!
Posted: Sun Aug 13, 2017 2:27 pm
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Joined: Sat Aug 25, 2007 10:06 am Posts: 358
Shifter55 wrote:
micra wrote:
As for Steele's Pendeloque, I'm not sure I follow, is the translation for the first angle in the instructions? I'm only getting a light return of 40% at the angles you gave me, and there is a lot of windowing at the sides of the design.
Yes, for the mains pavilion and crown. Picked recommended design angles for mains for corundum. Doesn't sound too good.
cut with no modifications in cristinite:
really love this design and the outline fits the rough nicely... wonder if there's a better combination of design angles to use for this than 41/37...
Post subject: Re: From the GPU - post your GemCAD design requests here!
Posted: Sun Aug 13, 2017 10:22 pm
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Joined: Sat Aug 25, 2007 10:06 am Posts: 358
Gem Ranger wrote:
Here you go Micra - http://www.facetdiagrams.org/database/f ... 05101.html I'd adjust the angles a bit in Gemcad ie. Pav 1 42.40 to 43.36, Cwn A 38.50 to 41.55, obviously letting the other angles adjust accordingly. That gives a nice broad performance curve in Gemray (RI 1.76)
Thank-you! That's a keeper, very pleasing. I feel a pear phase coming on.........
Post subject: Re: From the GPU - post your GemCAD design requests here!
Posted: Tue Aug 22, 2017 5:39 am
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Joined: Fri Dec 25, 2015 8:31 pm Posts: 276
micra wrote:
Yes, for the mains pavilion and crown. Picked recommended design angles for mains for corundum. Doesn't sound too good. really love this design and the outline fits the rough nicely... wonder if there's a better combination of design angles to use for this than 41/37...
I think I would just go with their angle choices for now... the design does seem to have a nice pattern at tilts of up to 15 degrees for those angles however. The low light return isn't uncommon with L@S designs, but people seem to get nice results with them in materials that aren't very dark...
Also, Robert Strickland uploaded a new pear this month on facet diagrams too, it's similar in shape to Compear but uses a 6-main SRB as a base instead of a 16-way round. http://www.facetdiagrams.org/database/f ... 05129.html
Just add 1 degree to the 3 bars on the pavilion, and cut the little corner facets on the crown at 45.5 degrees. It already cuts well in Quartz, but the slightly higher angles will give a bit more tilt performance.
Post subject: Re: From the GPU - post your GemCAD design requests here!
Posted: Fri Aug 25, 2017 9:11 am
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Joined: Wed Jun 22, 2016 8:23 am Posts: 99 Location: Colorado Springs, CO
Shifter55 wrote:
Just add 1 degree to the 3 bars on the pavilion, and cut the little corner facets on the crown at 45.5 degrees. It already cuts well in Quartz, but the slightly higher angles will give a bit more tilt performance.
Awesome, that's what I figured. I have a perfect Ametrine for it.
Post subject: Re: From the GPU - post your GemCAD design requests here!
Posted: Fri Nov 03, 2017 3:28 pm
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Joined: Wed Oct 14, 2015 8:41 am Posts: 153 Location: Germany
Hi I am looking for a simple Briolette design there are 3 I do like on facetdiagrams.org 01008, 01011 and 02.033 but they are not open. Has anyone something similar to share?
Post subject: Re: From the GPU - post your GemCAD design requests here!
Posted: Sat Nov 04, 2017 9:51 pm
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Joined: Fri Dec 25, 2015 8:31 pm Posts: 276
capcuadrate wrote:
Hi I am looking for a simple Briolette design there are 3 I do like on facetdiagrams.org 01008, 01011 and 02.033 but they are not open. Has anyone something similar to share?
Martin
Here is a one based off the triolette concept in a similar vein to those designs. This should provide a much better lightshow though. Render.
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