Rivista Italiana di Gemmologia #2: Available NOW in English - September 2017; See Gemological Articles below for full details!
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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Sat Aug 12, 2017 8:17 pm 
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My pick would be the Compear 133 (PC 05.101)

GR


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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Sat Aug 12, 2017 11:36 pm 
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Gem Ranger wrote:
My pick would be the Compear 133 (PC 05.101)

GR


Gem Ranger, can you tell me where I can find that design?


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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Sat Aug 12, 2017 11:42 pm 
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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.....


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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Sun Aug 13, 2017 2:52 am 
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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.


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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Sun Aug 13, 2017 10:10 am 
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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)


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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Sun Aug 13, 2017 2:27 pm 
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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.
Image
Image

cut with no modifications in cristinite:
Image
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...


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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Sun Aug 13, 2017 10:22 pm 
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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.........


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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Tue Aug 22, 2017 5:39 am 
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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

I'll let the render in topaz speak for itself.


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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Tue Aug 22, 2017 11:42 pm 
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Shifter55 wrote:
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
I'll let the render in topaz speak for itself.


wow, indeed! thanks, I will definitely give that one a try!


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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Thu Aug 24, 2017 5:55 pm 
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Can I get a Smith Bar modified for Quartz?

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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Thu Aug 24, 2017 8:44 pm 
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lse138 wrote:
Can I get a Smith Bar modified for Quartz?

http://web.archive.org/web/200909070655 ... hbar.shtml

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.


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 Post subject: Re: From the GPU - post your GemCAD design requests here!
PostPosted: Fri Aug 25, 2017 9:11 am 
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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.

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