Materials for a 3 metre, three frequency, five eighths icosahedron
I wanted to make a greenhouse growing dome using recycled materials as much as possible.The main expense for this growing dome was the bamboo. I bought 100 seven foot sticks as these had the best diameter to fit inside the recycled hosepipe. I bought some mixed colours of electrical insulation tape and five tubes of acrylic filler to wedge the smaller bamboo sticks inside the hosepipe.
I made the mistake of buying a very cheap stapler which kept exploding, nearly taking my eye out one time and then narrowly missing a window. The better one I purchased was certainly showing signs of wear by the time I got the plastic sheeting stapled onto the dome. All in all, once again I spent about £30 on materials.
|The first job was to saw all of the struts to size. I worked out the sums (see previous article) and laid out masking tape to size on a work surface to save measuring every piece.||After a while I had my struts cut to size and colour coded, stacked into containers.|
|Some of the struts were too bulbous to fit inside the hosepipe so I chamfered the ends down using a plane||Next – onto the hosepipe. This was leaky old hose that had been hanging round in the garden for ages and I was too mean to throw it away (as if there is an away!). I cut it up into about six inch lengths by eye.|
|I stuck a flat headed roofing nail through 3 pieces of the pipe to make the connections – for this dome most of the connections would use all 6 arms – but some only used 5, leaving a piece hanging||Then holding the connection, and the nailhead, firmly with ‘universal grip’, quick release pliers, I hammered the nail over to join the pieces.|
|Before long ( a few hours) I had the connectors I needed.||I premade the ‘C’ shapes for the 3 frequency isocahedron (see previous article)|
I had all the tools and materials I needed to put the dome together but it was some time before I got round to doing this. I started twice but inclement weather and pressure of work prevented me from concentrating. What comes next is a very complicated three dimensional jigsaw and I strongly recommend building a colour coded model before embarking on the next stage.