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The impossible sphere

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stigsolbjerg
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The impossible sphere

Postby stigsolbjerg » Sat Aug 18, 2018 11:42 am

Hi i have made a try on a sphere but there i somthing wrong. It is 400 mm diameter, so i took half diameter about 628 mm and made a 10 sided hexagon in side it gave somthing like 120 mm. so i made an orangepeel 120 wide and a curve 628. But it aint wright when i weld i togheter. I cant fit all 10 pieces in. Can anyone help me?
Sorry if i misspelled a lot.

ggeh
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Re: The impossible sphere

Postby ggeh » Sun Aug 19, 2018 10:22 am

need more info like a dxf file and or picture

stigsolbjerg
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Re: The impossible sphere

Postby stigsolbjerg » Sun Aug 19, 2018 11:56 am

Hmm the picture got lost in the first message. Ahhh max 2 mb. Here u see that 5 pieces dont make 180 degree but more
IMG_20180819_175517.jpg

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harrymorley
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Re: The impossible sphere

Postby harrymorley » Sun Aug 19, 2018 12:43 pm

I have a file i drew up for a 3d soccer ball that would make a cool fire pit if youre interested. It looks pretty easy to assemble. There are only two shapes in a soccer ball..hexagons and pentagons. knowing that , I drew 20 hexagons and 12 pentagons with equal length sides. Now you have all the sides. With a soccer ball to look at I think assembly would be relatively simple.

ggeh
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Re: The impossible sphere

Postby ggeh » Sun Aug 19, 2018 2:12 pm

stigsolbjerg wrote:Hi i have made a try on a sphere but there i somthing wrong. It is 400 mm diameter, so i took half diameter about 628 mm and made a 10 sided hexagon in side it gave somthing like 120 mm. so i made an orangepeel 120 wide and a curve 628. But it aint wright when i weld i togheter. I cant fit all 10 pieces in. Can anyone help me?
Sorry if i misspelled a lot.



Making a sphere is beyond my knowledge of being a high-school graduate with a C- average. I guess I don't understand what a ten sided hexagon is. I also dont know how to work in mm's. I tried a circle of a 400mm diameter and divided by 10 and ended up with 36 degree pie cuts, and the outer curved edge of each of the ten pieces would be 123.61mm in length. Are you then going to use a slip-roll or something to get get the desired sphere? Like I said I'm limited in math and don't know if and how this all changes when turning a flat circle into a sphere. But I know there are some really sharp people on this forum that do.

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stigsolbjerg
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Joined: Tue Jul 04, 2017 7:02 am

Re: The impossible sphere

Postby stigsolbjerg » Mon Aug 20, 2018 11:03 am

Hi did som more drawing today, and hope i found the problem, when u use the 123,61 mm and then the lenght of the half cirkel. Stick those toghter at the middel and then use the curve tool to create the sides =wrong. Today i made three more middel lenghts and then the curve is slightli smaller at the ends. So now im gonna cut it out of paper and then beltsand the pieces to fit.

stigsolbjerg
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Re: The impossible sphere

Postby stigsolbjerg » Mon Aug 20, 2018 11:04 am

IMG_20180820_170331.jpg

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rdj357
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Re: The impossible sphere

Postby rdj357 » Mon Aug 20, 2018 11:42 am

Here's what I came up with from an online ball pattern generator after cleaning up the DXF it produced. This is saved in inches so you may have to scale accordingly.

sphere_400_mm.dxf

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Robert Johnson
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DXF
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Re: The impossible sphere

Postby DXF » Mon Aug 20, 2018 12:06 pm

Try this to make a sphere. http://www.gma.org/surfing/imaging/globe.html
I used this method in my Cad to make the domes for this project.
viewtopic.php?f=12&t=6494&hilit=transfer+house

Dave Hanks

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Re: The impossible sphere

Postby BAR M » Thu Aug 23, 2018 10:06 am

Thank you very much Mr. Hanks. That is a very interesting site.

Bob


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