Calculation: 0.5 / tan(49) = 0,43464336890811333110004781935197 = 0.435 it has taken some time but there is my awnser lol
Dont have the pavilion good yet but im coming close, first time working with 3d in my programming language i like it but its painstaking work.. my programming language is official not for 3d drawing
That will be it. But that's why I cheated and use the calculator. No real urge to relearn trigonometry this decade.
But it is not the correct measurement...
If i take the 41* gemcad has P/W = 0.435 (0.5 / tan(90 - 41) = 0,4346)
But... If i remove all settings for the 41* my new settings wil be 42.1* if i export it in gemcad then... P/W = 0.443 Lets recalculate again
P/W = 0.435 Calc: (0.5 / tan(90 - 41.0) = 0,4346)
P/W = 0.443 Calc: (0.5 / tan(90 - 42.1) = 0,4517) <-- Is NOT correct!!!
Im almost thinking that my first calculation was correct and that gemcad is using the 0.1" for its Girdle?! But it aint! Hehehe why am i doing this lol But i need to calculate all angles for and positions and... for my machine.
Last edited by Nena (24 August 2016 12:21 am)
No. Your Gem CAD is having a bad day.
P/W =0.452 as per calculations. Just checked.
Hehehe its... dunno what to say verry strange! I see that my calculation is correct but why GemCad say's 0.443 is verry verry strange! Did you checked in GemCad?! The next thing is calculating meetpoints... Having fun... NOT lol hehehe!
Last edited by Nena (24 August 2016 12:50 am)
Did you checked in GemCad?!
Thanks! GemCad BUG lol When i can calculate the meetpoints i could build up the stone easily, but this takes some time i think. using all the angles and calculate the meetpoints. An head breaker! And not shure how to but ill give i try! Or do you know the calculation?
Last edited by Nena (24 August 2016 01:13 am)
If i am correct. This should be the meetpoint from the angles that i have. The last angle 41* gives the total height off the pavilion. The second 42.1* is larger that the height of the pavilion so that will be de widest facet of them all but it wil be cutted first. Than should the picture as drawed be correct.
The red lines are marking the meetpoint. Pavilion width is still 1". The drawing is half of the pavilion thats why you see 0.5".
If this is correct i can go on!
These calculations are not every day's work. On the lapidary machine you can set your angle just at the marked point, not mutch calculations have to be done, but if you want to draw a gemstone it is doing math...
I hope i did it correct
i think i got my meetpoint!
0.5 / tan(90 - 42.1) = 0,4517
0.5 / tan(90 - 41.0) = 0,4346
My new triangle wil be at 42.10*
Meetpoint Width: tan(47.9) * 0,4346 = 0,4809
Meetpoint Height: 0,4517 - 0,4346 = 0,0171
Meetpoint width coordinate is from center of the pavilion. The meetpoint height is from pavilion bottom.
I thought i calculated these correct! (Almost, i should measure from top to bottom) Ill try again...
Last edited by Nena (24 August 2016 04:17 am)
Don't understand this meetpoint width as I thought it was being kept 0.5. Where's this width if not that?
But I am having trouble with your diagram.
Me to , the above diagram isnt correct! I think i know how i need to get the meetpoint, its a complexer calculation then i thought... I need to calculate a width from the removed triangle. And when the width is even/crossing the width of 2 of the 42.1 facets. It shoult be possible!
I Need somthing to do with the cutted angle. If the cut is larger then the stone it shoult give the meetpoint, but how i going to solve this one??? Dont know
The 0.102" did i took from Gemcad. I Need to calculate that specific point for completing my drawing.
Last edited by Nena (24 August 2016 08:22 pm)
I did found a drawing solution but its not rock solid (i think) i cant use the information to draw a another gem. But it does give a perfect reflexion when i look at the given degrees.
With these lines i drawed i could build up a diamond cut but it wont work for a other drawing i think. I need a calculation of the degrees positioning a meetpoint. At this way i didnt use the cutting degrees to get my meetpoint. This example uses only the symmetric of the drawing.
If you got a idea, please tell me!
Last edited by Nena (25 August 2016 01:27 am)
I'm thinking. Not long seen diagram and it's near midnight.
Actually now after.
Been looking at Gem CAD. It's got me confused - why the culet at 0.0, 0.0, -0.8 (-0.4). It's confusing me and now I doubt that 0.102. I'm done.
Working a few day's with this problem gives also a headache but if im thinking about the upper drawing it could be well perfect. Becouse it is a symmetric shape that is being done on a index. So one of the lines need to be exact from one side to the other side, also by the given degrees. But if i think about that, a drawing that does not have exact symmetric, the light ist breaking at the good spot. Mmmzz it logic but...
If you measure in gemcad, you need to measure at the meetpoint and the tip of the pavilion. It says: 0,20372558 but you need to divide it by 2! Then you get 0,10186279 thats 0.102
If you measure in gemcad, you need to measure at the meetpoint and the tip of the pavilion. It says: 0,20372558 but you need to divide it by 2! Then you get 0,10186279 thats 0.102 wink
I get that. But 0.102 from where? ..................Seconds later. Got it!!!!!
It's not -0.102. It's -0.137. Wrong.
The culet tip should be at -0.870 but it's not, it's at -0.800. The girdle (lower edge) should be at 0.000 but it's at +0.070. So you have to add (or subtract in this case) 0.070 from your figures to put it in the correct place.
0.000 is actually part way down the stone.
Edit: Got totally thrown by that -0.8. Now I know where you are at.
Last edited by Mr Magoo (25 August 2016 11:08 am)
It's not -0.102. It's -0.137. Wrong.
You had it all right! the 0.137 is ok!
I drawed a solid in Autodesk Inventor 2016. What is that a problem to do by the way! Its not realy a program to make high res objects! But here is the awnser Took me a two hour to get it!
Dont know what it is but i cant get it from the buggy gemcad. Had some more troubles with it.
Here are the results of the drawing and finally i can look for the calculation to get the meetpoint! But i think i need to use 3 axis to get my awnser?!
Last edited by Nena (25 August 2016 09:17 pm)
I'm not convinced. I may be getting it all wrong.
In your middle image above I'm thinking -
Not 137 but 117
Not 158 but 102
Not 209 but 155
The above images are correct! I used all calculated messurements. Its 0.137 from the tip of the pavilion! I do not know the exact point after the .137. I let the computer calculate and the above is the awnser in the drawing. I cutted a piece away digital! And there where the results.
This is driving me bonkers...Ahhhhhhhhhhhhhhhhhhh!!!!!!!!!!!
Z = 0.082
Y = 0.102
Length of edge is 0.131.
All fits Gem CAD (assuming we are still on that diagram) -- I'm pretty sure
Check out your distance to meet 0.209 it will be far to big a portion of entire edge.
Length of entire egde/w = 0.663. That section to meet/w = 0.131
That length 0.202/0.131 = 1.541 Waaaayyyyyy toooooo looonnnggg
That's enough for tonight. Head's done in again.
Last edited by Mr Magoo (26 August 2016 12:27 am)
Why doesnt Gemcad use normal messurements from point 0 i have asked my wifes sister, mayby she can help me out! Im certainly that she knows! (I hope). Hehehe thats also why i want to calculate the point not only by drawing lines Ill going to check your findings. Im also not shure anymore.
About the sister from my wife she and her husband are both master of sience... Hope they know
I mayby think i can calculate the meetpoint! :- ) I thought it was extremely complicated but i think i can do it in a realy simple way. I can program it! I first need something else to calculate. I have thinking about for hours and i can get the awnser myself
I think the answer is in Gem CAD. The answer's fit Pythagoras Theorem in multiple ways.
The Z, Yaxis is out because the stone is cut with 0,0,0's already in place. It does not set the girdle to 0.
TBH this has been a great lesson in understanding GC
This has been hilarious lovin it
Wisdom is knowing how little you know
This has been hilarious lovin it
But im almost there, need to do a triangle calculation on the 1.1 degrees (42.1* - 41*) I hope i do it correct! If i got that i can solve all maths of the meetpoints! I HOPE im not shure but!? I do my best!
IF GOT IT!!!
I Now need to make the full calculation, but should i post the calculation?! There are not many people who can do it, and it becomes a danger for GemCad.
Last edited by Nena (26 August 2016 10:40 pm)