Tribe.net. Local Connections Ash of the Dark http://geodesicdomes.tribe.net/thread/0b195f18-e67f-4c47-b100-b7c2dbcfc32c#4617c594-8376-43d0-898a-c3ee5c1939d5 2009-07-05T16:06:59Z 2009-07-05T16:06:59Z

Excellent! The degree to which the edges are bevelled - I've never been able to figure that out! What I think I might do is to "tab" all the pents, hexes, and half-hexes with 1x2's, which have been bevelled to those very degrees, and lay the bevelled angle against the shape panels. These 1x2 tabs would have a few holes drilled along their length, to allow for bolts to join the tab of one panel to the tab of another. Another idea would be to use 1x4's for the tabs, put in 2" of insulation, and fit an interior panel to hold it in place. The remaining couple inches on the tab would be drilled for tab-bolting, as above. Either way, the bevel angle is crucial to this design, so I really thank you for clarifying that for me. When I have a bigger vehicle to transport the panels needed to build a structure like this, I will be so very excited to bring one out to the playa!

Ash of the Dark 2009-07-05T16:06:59Z Jim http://geodesicdomes.tribe.net/thread/0b195f18-e67f-4c47-b100-b7c2dbcfc32c#f9280292-deab-414b-a874-e2007e46329f 2009-06-18T03:50:31Z 2009-06-18T03:50:31Z

The Cosmology Gallery in the picture is basically a 3V, 5/9 icosahedron dome, only using the "B" struts, the middle length struts. See: http://simplydifferently.org/Geodesic_Dome_Notes?page=3#The%20Icosahedron The green struts in the 3v, 5/9 dome (roughly mid-page) are the "B" struts. They are the same as the ridges/joints on the Cosmology Gallery. If you were using sheets of plywood you would cut six pentagons, 10 hexagons, and 5 1/2-hexagons. You'd then bevel the hex-hex edges to about 69 (69 degrees, 5 minutes, and 30 seconds exactly) degrees and the hex-pent edges to about 71 degrees (71 degrees, 18 minutes, 30 seconds exactly). See: http://www.coolmath.com/reference/polyhedra-truncated-icosahedron.html You'll need between 9 & 18 sheets of plywood/osb/insulated panels for this, depending on the size you want. You'll also have to cut strips of wood to join the panels, side screwing plywood at these angles would be near impossible. If you built a classic 3V, 5/9 dome using 3/4 EMT as a Bucky Ball, you would need 59, or so-depending on the door, struts vs. 165 for a standard dome. You'd also only have 21 vs. 105 faces of a standard dome.

Jim 2009-06-18T03:50:31Z Ash of the Dark http://geodesicdomes.tribe.net/thread/0b195f18-e67f-4c47-b100-b7c2dbcfc32c#49abd163-0fdd-43f3-9260-c6c707f82e6d 2009-01-27T20:29:53Z 2009-01-27T20:29:53Z

I was wondering if any of you have tried building a dome based on the design of the truncated icosahedron? I am kicking around ideas for building a panelized version, for two people to camp out in at Burning Man, and would love to hear of any experiences you may have had. The Cosmology Gallery in Western Australia is built like this: http://www.gdc.asn.au/gallery/Celestial/images/cosmology_gallery_1575.jpg -- wish I could make those tri-directional metal braces they seem to be using on theirs... :)

Ash of the Dark 2009-01-27T20:29:53Z