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#26

Mr Magoo
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Joined: 04 May 2014
Posts: 210
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23 August 2016 11:52 pm

Nena wrote:

Got it!

Calculation: 0.5 / tan(49) = 0,43464336890811333110004781935197 = 0.435 smile it has taken some time but there is my awnser big_smile lol

Dont have the pavilion good yet but im coming close, first time working with 3d in my programming language smile i like it but its painstaking work.. my programming language is official not for 3d drawing smile

That will be it. But that's why I cheated and use the calculator. No real urge to relearn trigonometry this decade. wink

#27

Nena
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From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
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24 August 2016 12:12 am

But it is not the correct measurement... sad

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 big_smile But i need to calculate all angles for and positions and... for my machine.

Last edited by Nena (24 August 2016 12:21 am)

#28

Mr Magoo
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Joined: 04 May 2014
Posts: 210
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24 August 2016 12:28 am

No. Your Gem CAD is having a bad day.

P/W =0.452 as per calculations. Just checked.

#29

Nena
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From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
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24 August 2016 12:37 am

Hehehe big_smile its... dunno what to say big_smile 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... smile Having fun... NOT lol hehehe!

Last edited by Nena (24 August 2016 12:50 am)

#30

Mr Magoo
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Joined: 04 May 2014
Posts: 210
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24 August 2016 12:51 am

Did you checked in GemCad?!

Yep! smile P/W=0.452

#31

Nena
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From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
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24 August 2016 01:01 am

Thanks! GemCad BUG big_smile 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? big_smile

Last edited by Nena (24 August 2016 01:13 am)

#32

Nena
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From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
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24 August 2016 02:19 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.

degrees_e.jpg

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 big_smile

#33

Nena
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From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
Member
24 August 2016 03:55 am

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)

#34

Mr Magoo
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Joined: 04 May 2014
Posts: 210
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24 August 2016 03:59 pm

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.

#35

Nena
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From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
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24 August 2016 07:30 pm

Me to smile, 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 big_smile

degrees_f.jpg

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)

#36

Nena
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From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
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25 August 2016 12:43 am

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.

degrees_g.jpg

If you got a idea, please tell me! ops

Last edited by Nena (25 August 2016 01:27 am)

#37

Mr Magoo
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Joined: 04 May 2014
Posts: 210
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25 August 2016 01:45 am

I'm thinking. Not long seen diagram and it's near midnight. glasses

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. smile

#38

Nena
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From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
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25 August 2016 02:07 am

Working a few day's with this problem gives also a headache big_smile 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 wink

Greets

#39

Mr Magoo
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Joined: 04 May 2014
Posts: 210
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25 August 2016 10:37 am

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)

#40

Nena
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From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
Member
25 August 2016 09:05 pm

Mr Magoo wrote:

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 big_smile 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?!

degrees_h.jpg
degrees_i.jpg
degrees_j.jpg

Last edited by Nena (25 August 2016 09:17 pm)

#41

Mr Magoo
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Joined: 04 May 2014
Posts: 210
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25 August 2016 10:08 pm

I'm not convinced. I may be getting it all wrong.

In your middle image above I'm thinking - hmm

Not 137 but 117
Not 158 but 102
Not 209 but 155

#42

Nena
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From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
Member
25 August 2016 10:15 pm

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 big_smile digital! And there where the results.

#43

Mr Magoo
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Joined: 04 May 2014
Posts: 210
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26 August 2016 12:14 am

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 smile

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)

1 user likes this post: kawman

#44

Nena
Member
From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
Member
26 August 2016 05:19 am

Hmm,

Why doesnt Gemcad use normal messurements from point 0 big_smile 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 big_smile not only by drawing lines big_smile 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 big_smile

#45

Nena
Member
From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
Member
26 August 2016 10:42 am

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 big_smile

#46

Mr Magoo
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Joined: 04 May 2014
Posts: 210
Member
26 August 2016 05:21 pm

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

#47

AtomRat
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From: Katazone, VIC
Joined: 22 May 2014
Posts: 5,080
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26 August 2016 08:45 pm

This has been hilarious lol lovin it


Wisdom is knowing how little you know

#48

Mr Magoo
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Joined: 04 May 2014
Posts: 210
Member
26 August 2016 10:10 pm

AtomRat wrote:

This has been hilarious lol lovin it

1472209773_meaning.jpg

Meaning???? lol lol

1 user likes this post: AtomRat

#49

Nena
Member
From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
Member
26 August 2016 10:14 pm

Hehehe big_smile

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! big_smile I HOPE im not shure but!? I do my best!

#50

Nena
Member
From: Hoogeveen (NL)
Joined: 03 July 2016
Posts: 216
Member
26 August 2016 10:39 pm

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)


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