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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 proje...
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 guarantee ...
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, 2 with 2.63 feet and 2 with ...
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 feet of conduit ...
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 Consultant...
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 discove...
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Posted:Feb 26, 2012
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