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I have an old trunk in my backyard The trunk is 18 ft height and the diameter at the top is 2.8 ft
I think I am obsessed with the geometry of truncated Icosahedron (These and all others Platonics and Archimedians geometric solids) but for this project, I will built a ...
The first step was to cut 70 straws (Struts) with 5.5 inches each and cut 60 straws (Struts) with 4.8 inches each. I made a small device to ...
I bent and made holes in both sides of all 130 straws
I assembled the first pentagon with the short straws (4.8”) inside and the long straws (5.5”) outside.
I then assembled 11 other pentagons (total 12 pentagons) all the same.
The first assembly step was, in each vertices of the pentagon, I attached another vertices of another pentagon
I then attached the sides of the all pentagons
By repeating this operation again and you will have two half spheres ready to be connected.
Connect the 2 vertices of each pentagon with the 2 other vertices of the other 2 pentagons I made it at Techshop
after that I got a piece of a tree trunk (diameter 5.99 inches and 37 inches in length)
I tied the geodesic sphere to the trunk To mock the final product of this Intructable
Once the prototype showed satisfactory structure and stability, I decided to go for the real project
To make a quick test on the real size, I was at home depot and bought 5 pieces of 10 foot ¾ EMT Conduit
After that I made 3 cuts in each. Two cuts with 2.63 feet (2” 7’ ½) and one with 2.32. (2” 3’ ¾) the result was 4 struts, ...
Filed the ends
then bent all ends
then, I punctured to make a hole in each end
I made a 25/64 diameter hole in each end
After that I bent all ends with a angle of 18 degrees for the long ones and 16 degrees for the short ones
with all struts, bolts, washers and nuts ready, I started the assembly of one pentagon to check the overall process
Looks good The next step was to buy 28 pieces of 10 foot ¾ EMT Conduit and make 11 more pentagons a total of 12 pentagons About 320 ...
The only step I feel deserves a comment in this part of the process was when I took all the remaining pieces, with the support of the Dream ...
Then I assembled the 2 half spheres (see the video Instructable - Geodesic Sphere)
and put the two halves together to make my geodesic sphere (see the video Instructable - Geodesic Sphere)
Then I drove home with my sphere safely tied to the bed of my truck
After 1 day I revised all plans including the detailed process to assemble the Geodesic Sphere in the top of the tree trunk, after all that, I discovered that ...
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