Geodesic dome

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Project Geodesic Dome
Status In progress
Contact User:Morphje
Last Update 2015-07-06

Morphje is building a geodesic dome. This page houses all related information about this project.


Background

I've always wanted to build a geodesic dome. That's basically it. I positively enjoy the beautiful shape, it's geometrics and sturdiness using only basic materials. The round shape makes it an ideal candidate for high wind sites, since the drag coefficient is very low. For a 9.1 meter dome, the wind load is only 500 KG in a gale force wind (8 bft).

Project goals

At the hackerspace, bigger is better and when doing it's worth overdoing. The only thing i'm overdoing is it's size: 9.1 meter in diameter. All materials are chosen for lightweight, low cost, but still be able to carry my own weight.

  • Total costs: <400 EUR
  • Primary material: wood (pine 22x48 mm)
  • Size: 9.1 meter
  • Height: 3.7 meter (or 5.4m when extended to 5/9 3v)
  • Type: 4/9 3v Krushke dome

Costs

Costs so far:

Item Notes Cost (EUR)
Wooden struts Pine; 22x48mm. hornbach, 60 3m60 lengths
It's basicly strong enough to hold me, see pictures
101
Metal pipe inserts 12mm CV pipe; galvanized; Installand 4 6m lengths
This one was a gamble, but it paid out nicely
29
Metal end cap rings 25x50x1.5 mm rectangular steel, cut into 10mm sections. 6m length
This is used to strengthen the wood, so it won't split
33
nuts and bolts m3; hornbach 50(-ish tbd)
dogtail M6 bolts m6; tbd
dogtail bolts are awesome for assembly
tbd
tarp 70-ish/TBD
Ratchet straps 1500kg 40-ish/TBD
Anchors 30x30 square tubing 30-ish/TBD
Paint

Calculations

Buildlog

Testing

Final conclusion: It works like a charm, full steam ahead!

Tools created

Metal parts fabrication

There are 2 metal parts. A collar to prevent the wood from splitting and a pipe insert which is used for connecting the struts together. These parts are then inserted into the wood, final strut length be set and then fastened with m3 bolts. Because the pipes are inserted last, you tweak the final length of the strut. The wood strut dimensions don't have to be exact.

Wooden struts assembly

Door

Tarp

Anchors

Tool list

Actual full build