EC and trap help

[rockysalamander]

I've been trying to find a way to help with this. I think the 1st dibs pics may help. So, you can use your actual measurements of your ECs and see if the proportions are similar. Just remember than the bezel measurement suggested below include the metal.

BLUE = EC, Orange=Traps, Red=bullet (to the tip)

Picture on the LEFT. From the side, the width of the top stone is 2.12Xwith width of the traps+bezel. Width means east to west in this photo on the left. The EC is 2.19xwider than the bullet is long to the tip.

Picture on the RIGHT. From the top, the height EC is 1.64 times the height of the traps (metal + diamond). The EC is 3.52xtaller than the bullet is wide.

 

[diamondseeker2006]

This is great, @rockysalamander! Can you figure out the size the traps need to be to have these proportions?

I honestly think the traps selected are too big in every direction N-S and E-W, considering they aren't bezeled yet.

 

[rockysalamander]

This is great, @rockysalamander! Can you figure out the size the traps need to be to have these proportions?

I honestly think the traps selected are too big in every direction N-S and E-W, considering they aren't bezeled yet.

If she can post her ECs dimensions, I can do the actual math.

 

[Emeraldsaremyfavorite]

@rockysalamander- wow, thank you! It’s been a while since I have taken a math class and have little kids so let me see if I have this. My side is 2.06 EC to the traps, top- length view is 1.67- sound right?? My main EC measures 10.46 x 8.04. Traps 6.25, east west- 3.9

 

[Emeraldsaremyfavorite]

These are of course without bezel

 

[Emeraldsaremyfavorite]

And I know he exact dimensions of MB EC- 9.98 x 8.04

 

[Emeraldsaremyfavorite]

How thick is the average bezel? One like the picture attached? If these measurements are correct... the traps are too big when you add say .75 bezel

 

[Emeraldsaremyfavorite]

Also... we are comparing my EC and traps flat... not on an angle

 

[Emeraldsaremyfavorite]

@rockysalamander can you let me know if these calculations I did are right? I need to let David know if these traps just won’t work, thank you sooo much!

 

[rockysalamander]

Here's how the numbers work. Sorry for the delay.

Your EC = 10.46 x 8.04
Traps = 4.93 top to bottom; 4.90 width at top
Bullets = 4.78 top to bottom; 1.39 at top

When you set a bezel, the wall thickness is between .8-1mm. You cut away about 1/2 that to make the seat for the stone. So, each side of a bezel adds .4-.5 mm or a total of .8-1 mm. So, the Traps would be ~.8 to 1 mm less if you subtract the width of the bezel.

(using .8 below as DK bezel's are very delicate)
Your EC = 10.46 x 8.04
Traps = 4.13 top to bottom; 4.10 width at top
Bullets = 3.98 top to bottom; .59 at top

 

[meely]

Here's how the numbers work. Sorry for the delay.

Your EC = 10.46 x 8.04
Traps = 4.93 top to bottom; 4.90 width at top
Bullets = 4.78 top to bottom; 1.39 at top

When you set a bezel, the wall thickness is between .8-1mm. You cut away about 1/2 that to make the seat for the stone. So, each side of a bezel adds .4-.5 mm or a total of .8-1 mm. So, the Traps would be ~.8 to 1 mm less if you subtract the width of the bezel.

(using .8 below as DK bezel's are very delicate)
Your EC = 10.46 x 8.04
Traps = 4.13 top to bottom; 4.10 width at top
Bullets = 3.98 top to bottom; .59 at top

Nice calculations but to the stupid amongst us (me) what does it mean - how off are those proportions?

From a visual perspective I am also in camp traps are too big and bullets are too long.

 

[rockysalamander]

what does it mean - how off are those proportions?

Can you explain? I'm not sure how to answer this. The math is exact. I used the inspo to develop a proportion and applied to her EC. While they may be off by .2 or so (low res photos), it does demonstrate that the traps in the inspo are basically square (if you ignore the taper). The traps in the Cad are 6.25*3.9. So, they are much wider than tall.

That said...with a small finger size, the height of the traps may need to be reduced to be able to add the bullet. So, the top width of the trap matching the inspo would be more important to *me* to achieve that proportion. At the least, the match confirms what PS member said...that the proportion of the sides was chunkier.

 

[meely]

Can you explain? I'm not sure how to answer this. The math is exact. I used the inspo to develop a proportion and applied to her EC. While they may be off by .2 or so (low res photos), it does demonstrate that the traps in the inspo are basically square (if you ignore the taper). The traps in the Cad are 6.25*3.9. So, they are much wider than tall.

That said...with a small finger size, the height of the traps may need to be reduced to be able to add the bullet. So, the top width of the trap matching the inspo would be more important to *me* to achieve that proportion. At the least, the match confirms what PS member said...that the proportion of the sides was chunkier.

Ok I get what you are saying. I was just asking how you then apply those calculations to getting the proportions of the DK ring to be the same as the MB ring? I wasn't criticising the math (trust me in no position) just asking what it meant in terms of getting the proportions right because it was still going over my head. Not that it matters its @Emeraldsaremyfavorite ring not mine.
You do a great job with the CADs Rocky.

 

[rockysalamander]

Ok I get what you are saying. I was just asking how you then apply those calculations to getting the proportions of the DK ring to be the same as the MB ring? I wasn't criticising the math (trust me in no position) just asking what it meant in terms of getting the proportions right because it was still going over my head. Not that it matters its @Emeraldsaremyfavorite ring not mine.
You do a great job with the CADs Rocky.

Oh...I did not take it personally. I truly was not sure what you were asking.

{switching to metric...because the math is easier and correct me if this is a rabbit hole}
Think of it this way, imagine looking at a train car. You want to build a 'scale model', but at you don't have room for a whole train car. So, uou measure a window on the big train. The full-size one is 1 m tall and 2 m wide, or 1:2.



In more simple terms, this is like pasting a photo into software and then only changing the size by grabbing the corner (or keeping the length/width the same) vs. grabbing the side and dragging it.

So, on the inspo ring. I measured each of the lines I drew. I just used the default measuring in my graphics program, because the actual units don't matter for this step. I'm just interested in the ratio/proportion. So, that let me relate the sizes of the various elements to the main stone. I just created the proportions between the elements. With those proportions in hand, I used her actual EC measurements since I used the main stone as my basis for expressing the proportions. For example, I took her lenght (8.04 mm) and divided by the proportion of the top of the trap (2.12). So, 8.04 mm/2.12= 4.9 mm.

Did that help or have I gone off the rails?

 

[meely]

Oh...I did not take it personally. I truly was not sure what you were asking.

{switching to metric...because the math is easier and correct me if this is a rabbit hole}
Think of it this way, imagine looking at a train car. You want to build a 'scale model', but at you don't have room for a whole train car. So, uou measure a window on the big train. The full-size one is 1 m tall and 2 m wide, or 1:2.



In more simple terms, this is like pasting a photo into software and then only changing the size by grabbing the corner (or keeping the length/width the same) vs. grabbing the side and dragging it.

So, on the inspo ring. I measured each of the lines I drew. I just used the default measuring in my graphics program, because the actual units don't matter for this step. I'm just interested in the ratio/proportion. So, that let me relate the sizes of the various elements to the main stone. I just created the proportions between the elements. With those proportions in hand, I used her actual EC measurements since I used the main stone as my basis for expressing the proportions. For example, I took her lenght (8.04 mm) and divided by the proportion of the top of the trap (2.12). So, 8.04 mm/2.12= 4.9 mm.

Did that help or have I gone off the rails?

Ha. Yeah get it all apart from he last bit lol never mind.

 

[Emeraldsaremyfavorite]

@rockysalamander thanks so much for doing this! So the current traps are just way too big all around we are gathering.

So I decided to put this project on hold. I found myself staying up way too late, obsessing over details and being tired and crabby with my 3 kids. School is starting and I need to concentrate on them. Hubby is going nuts with all my obsessing so it’s time to put on the breaks and revisit when things calm down a bit. David was more than gracious and understanding.

Will definitely keep you all in the loop when I decide to proceed!