Nov 112012
 

Today marks the start of www.diygeodome.com, the site set up to walk you through building your own icosahedron geodesic dome, for the purpose of growing vegetables and farming fish in a controlled environment, free of harmful chemicals.

Nothing about this build is going to be straight forward, as we will be fabricating as much of the dome as possible. I will be walking you what to purchase, and then how to assemble the various parts. At the end of the project we will have measured out and cut our own steel, welded the various hubs parts together, cut our own lumber, cut our own covering plastic sheets, and then assembled the entire structure. From there we will get into the dome and fabricate the grow beds, build your own bell siphon value with all its plumbing, and then create your fish tank from IBC (Intermediate bulk container).

Where this build will be totally different from all the others out there is the automation we will be using. I will be walking you through purchasing an Arduino programmable prototyping platform (www.arduino.cc), some electronic components, and assembling and soldering the various components together. Then integrating the components, together with your Arduino, to make your dome self-sufficient and intelligent.

Well, I hope this project has you all excited and revving to go!

Nov 262012
 

After months of planning, welding, cutting, painting, spraying, bending, measuring, drilling and cursing, the dome framework is finally complete and assembled. Yes I know there is no door, but I will be installing the door in the next couple of days.

Whilst I am waiting for my plastic sheeting, I will be starting with my instruction videos for all you DIY fanatics out there. Just FYI, the small triangular structure on the floor of the dome, is my son building his own dome.

Now to put the dome into perspective, it is 4 meters or 13 foot in diameter, and at its apex it is 2.34 meters or 7.6 foot high. It is constructed on 61 steel hubs, and 165 cut pieces of lumber.

Dec 032012
 

With it becoming increasingly more and more difficult getting in and out of the dome (slithering on my belly is loosing its appeal), I relented and broke out the power tools and proceeded to create a door in the rear of the dome.

I had to cut off 6 of the metal strips from the bottom hub 3s, and the middle hub 4s and the top hub 1s. This was done to ensure that the door is able to swing freely on its hinges, but not fold into the dome,  placing strain on the wooden beam holding the door in place, and potentially tearing the screws from the wood. To ensure that the door could open easily, I cut off 7mm from the top of the all A-sized struts radiating from the door’s hub 2.

Now all that is left is to seal the wood, and to mount the door.

 

Dec 032012
 

Christmas has come early, with the supplier delivering my first order of Marlon multiwall polycarbonate sheeting.

The supplier I used is Duroplastic, based in Johannesburg. I can really recommend them as their service was fast and professional, and their driver was extremely pleasant person to deal with. Thanks Duroplastic! They can be reached at sales@duroplastic.com

Dec 052012
 

Yesterday saw me creating the first of five window frames that gets installed in the triangular space between the two hub 1s, on the third tier of the dome. The cutting of the wood was rather tricky, but I managed to do a half-decent job.

The window opening was measured and each side was 700mm. Now maths teaches us that triangles of equal length are called equilateral triangles, and all the internal angles are the same. So each corner must be 60 degrees.

My daughter and I fed left-over planks through the table saw, and cut strips of 15mm x 32mm x 1m. From there we measured out three planks and marked off the 700mm mark and once again it was back to the table saw, to cut a 60 degree angle, but at a 8 degree camber. Once the lengths were cut, they lined up neatly. I now needed to add in a spacer to give the window a perfect fit.

Breaking out the mitre saw, I cut a 2.5cm piece of the 15mm x 32mm x 1m wood with a 12 degree angle and a 12 degree camber on both ends. This was then placed between two corners and tacked together with 1.6mm panel pins. I will either opt for a wood filler or simply mix saw dust with cold glue to get a smoother finish around the joins.

With the hinges attached, it is now time to varnish the first window frame and then to install it.

Once the dome is complete and the Arduino is installed, the Arduino will be taking frequent temperature measurements, and should the dome get too hot, the Arduino will drive a small servo motor and open the windows automatically, and close the windows when the temperature returns to normal.

Dec 062012
 

Finally I have completed all the window frames, and given them a coating of varnish. I would have fitted them to the dome but it had started to rain, so I will do it tomorrow.

You will note that the hinges are placed on the outside of the frame. When I was testing the design, the heads of the screws kept on pushing against each other thus preventing the windows from closing properly.

Completed window frames drying

Dec 082012
 

Today I completed installing the window frames and installing the door to the dome (pictures will follow tomorrow). I also fabricated the jig I will be using to trace the various triangles onto the plastic so that I can cut them out, using a circular saw and a very fine toothed blade. The jig was created with three pieces of 30mmx3mmx800mm flat bar, which I cleaned up and cut a slot into the top and the bottom of the bar. I installed a screw and nut at both ends, which allows the triangle to be sized.

To use the jig, it gets placed against one of the triangles, and then gets aligned so that it masks off the top half of the wooden strut, exposing the triangle and half of the wooden strut. The nuts then gets tightened and the jig is then transferred onto the plastic where the shape is traced and then cut out.

Dec 092012
 

Here are the pictures of the installed and working door, together with the five windows, which together with the Arduino, will help keep the temperature inside the dome under control.

Apr 082013
 

I have recently immigrated from South Africa to the sunny East coast of Australia. My dome is in pieces, and being packed into a shipping container, en route to Sydney. Once it has arrived, I will continue the construction of the hub.

Please feel free to post comments or questions.