Maxidome

Maxidome
Participants
Skills	construction, grinding, drilling
Status	Active
Niche	Mechanics
Purpose	Infrastructure
Tool	No
Location
Cost
Tool category

Maxidome

IMG_20150807_205134.jpg {{#if:No | [[Tool Owner::{{{ProjectParticipants}}} | }} {{#if:No | [[Tool Cost:: | }}

Frame construction

Tubing

• 30 x 'S' : 1.57m x 22mm steel
• 40 x 'M' : 1.82m x 22mm steel
• 50 x 'L' : 1.86m x 22mm steel

Hubs

• 46x 40mm steel ring
• 25 x 6-way rings
• 6 x 5-way rings
• 15 x 4-way rings

Construction of full scale ziptie hub prototype

• 

  Take 75mm ring with 24mm drilled holes, 40mm inner hub ring, strut and ziptie.

• 

  Ziptie ring in 8mm drilled holes.

• 

  Continue as above.

• 

  Make sure to leave ~5mm on the ziptie when cutting short so the catch cannot slip so easily.

Fasteners

• 7 mm wide zipties
• Grommets
• Tent rope

Container construction

We need one or more containers to be able to transport the dome in. Before we can build a container we need to figure out what the optimal design would be. A wooden crate? Multiple wooden crates? Plastic bag? Duffelbag? Plz help think

Design decisions

• The dome will be 9m in diameter
• The tubes will be 22m steel tubes
• The inner ring of the hub will be a 40mm external diameter steel ring, with a height of 25 mm.
• The outer ring of the hub will be a 75mm external diameter PVC ring, with a height of 50mm.
• Both ends of a steel pipe will be equipped with a 8mm hole, with it's centerpoint located 8mm from the edge.
• The outer hub will be equipped with 24mm holes.
• The short pipes (A) are marked with BLACK tape
• The medium pipes (B) are marked with WHITE tape
• The long pipes (C) are marked with RED tape
• 140 grommets are needed
• 60 herrings are needed
• Special tape is used to provide "meat" to mount the grommets on the cover

TODO

Frame construction

• Acquire missing tools needed
• Settle on size
• Settle on tube diameter
• Settle on hub design
• Determine total length of tubing required
• Find supply of steel tubing
• Design hubcap
• Print hubcaps
• Purchase tubes
• Select zipties
• Purchase zipties
• Cut tubes to required lengths
• Mark tubes according to type
• Deburr pipes
• Drill tube ends so zipties can be fitted
• Order rebar
• Create assembly plan
• Assemble in back yard
• Settle on container solution (how are we going to transport the fucker?)

Cover construction

• Request a sample of hermetix from supplier
• Validate Hermetix as viable covering candidate. We'll see when we get it
• Decide on covering material
• Find supply of covering material
• Decide on how to bind the shapes together
• Find the appropriate grommets to mount in the cover in order to rope the covering down (10 mm? 20 mm?) 10mm
• Determine how many grommets are needed
• Order grommets
• Order grommet fastening tool, if the one we have does not fit
• Order special tape like fabric to strengthen the joint between the cover and the grommet
• Calculate how much rope we need 200m should be enough
• Order rope
• Find a method to cut holes in the fabric in order the mount the rivets
• Determine amount of herrings
• Order herrings
• Extract required shapes from material
• Create cool showoffy idiopolis artsy design for covering

Container construction

• Settle on container type
• Design containers?
• Build containers

Construction

• Start with a 5-way connector and put 5 S tubes around it. Tip these with 6-way connectors, and connect them with 5 M's to form five MSS triangles, putting the covers on the M pipes here oriented with the seams inwards.
• Add two L tubes to each of the outlying 6-ways leaving the last connection free. Connect these at the ends into five LLM triangles with more 6-way connectors.
• Fill up that last space with M tubes, and end those with 6-way connectors. Join all the outlying 6-way connectors up with more A tubes to make 10 more LLM triangles. This will lift the dome.
• Unfurl the covers down to the next layer and connect them with bolts.
• Attach internal guttering to seams
• Any 6-way with just L pipes to it, add two more L pipes. Any others, put two M pipes around it leaving the centre free.
• Make 5 more 5-way connectors with three S-tubes and put the middle to the remaining spaces where the B-tubes join. Then use more 6-way connectors to join up the next outer pair and form 10 more LLM and 10 MSS triangles.
• Lift the centre of the dome and connect the new 6-way connectors from above with an M-pipe.
• Add middle node to constrcution and spool out power cable for nodes
• Unfurl the covers down to the next layer and connect them with bolts.
• Extend internal guttering to seams
• Lift the pentagonal top face in now and tie it down to the lowest pipes.
• Construct the full outer ring made of LLM triplets in five sets. Line up the M-pipes with the five-way hubs.
• Get five people to lift the dome at the five 5-way hubs. When this is done, position and pin in the last layer with pipes so that:

 * S pipes go to 5-way hubs
 *Any 4-way hub with S pipes has only M as its partner
 * All others are L-pipes.

• Unfurl the covers down to the next layer and connect them with bolts.
• Extend internal guttering to seams
• Hammer in ten fishhooks around the dome to keep it down.
• Use pipe lagging to define a door or two

Cost

• Pipes 396 euro
• Covering material (Hermetix) 137 euro
• Hubrings: 1 node
• Zipties 20 euro
• 200m Shavelines: 63 euro
• 60 herrings: 12 euro
• Mounting tape for sailrings: 10.5 euro
• 140 Sailrings 21.80
• Sailring mount tool + shipping: 10

Total: 670.30 euro

Useful links

• http://www.cvtotaal.nl/cv-buis-22.html
• http://www.dekzeilenshop.be/nl-content1.asp
• http://www.deboerdrachten.nl/landbouwplastic-landbouwfolie/4682013/Landbouwplastic-Hermetix-50-x-8-meter-wit-groen/
• http://www.touwenwinkel.nl/?p=productsMore&iProduct=1655&sName=aanbieding.-katoen-6-mm-hol-gevlochten--groen--haspel-100-meter.