Geodesic dome
| 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.
- Dome.jpg
metal parts in different stages of production