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Müller Geodesic Solitude Johnny's Capsule Geodesic Clay Mud Dome Jurtendorf (Switzerland) Neolithics of Pfyn Strawbale Cabin Dome Geodesic Dome Geodesic Dome Notes & Calculator Geodesic Dome Diary 2014: 5m 2v Icosa The Numbers The Details 2006: 6.3m 4v Icosa The Numbers The Details The Diary Geodesic Polyhedra Polyhedra Notes Bow Dome Triangulated Bow Dome Star Dome Star Dome Diary Wigwam Zome Helix Zome Low Cost Dome (PVC) Miscellaneous Domes Site Search Enter term & press ENTER If you found the information useful, consider to make a donation:   Page << Prev | 1 | 2 | 3 | 4 | Next >> Geodesic Dome Diary written by Rene K. Mueller, Copyright (c) 2007, 2014, last updated Tue, January 20, 2015 20. 2. 2007: Planning Pitch Up, Take Down & Storage 4V 4/8 building instruction After some pondering, I realized a good procedure to compose the entire dome and then disassemble it again partially again without much overhead. That's what I came up: compose 6x (A+B+C+D+F) entirely together, pre-form them if you want, per composition: 5xA + 5xB + 10xC + 10xD + 5xF pitch up: compose A+B+C+D+F compositions with E as well, starting with the top A+B+C+D+F, and working the other 5 compositions around the top one take down: disconnect the E triangles, and leave A+B+C+D+F together, and store those six compositions aside This way I need 10 + 5 + 1 = 16 screws per composition (6x 16 = 96 screws), the final dome requires only 91 screws as common edges reduce those 96. The main advantage is obvious: I only compose once 250 struts in 6 compositions, once done, I pitch up or take down only 6 compositions (which are expected easy to handle by a single person) plus 10x 3 E triangles. The estimate height of A+B+C+D+F in my case ~ 2x (F+A) = 2 * (94.5cm + 80.1cm) = ~3.00m 19. 2. 2007: Completed Struts Finished 250 bamboo struts with connectors After apprx. 20 hours work of adding the 250 connectors to the bamboo stick/struts by drilling 1500 holes (6 holes per strut: 2 into bamboo, 2 x 2 into connector), the skeleton is finished. While working I slightly changed the procedure, by cutting the connector pointing as 2nd last step and last step drill final hole-to-hole holes into the connectors. I have only 3 full length spare 182cm long bamboo left for possible spare D and E struts, and hope not using them - otherwise apprx. 10x 90cm long bamboo which allow me to make spare A, B, C and F struts. I also noticed using cablebinder below 8°C while binding raises the risk to break them while pulling, so I wonder how the cable binders will behave in the winter with tension of a storm for example - certainly things to look at. Now I need to wait for a few dry days, and a test to pitch the skeleton for the first time. I will then measure the diameter more exact in order to calculate the leaf-like cover I will make for it. I'm also pondering of reusing the rain cover and thermal insulation of the yurt: yurt roof rain cover: 7.5m x 7.5m yurt wall rain cover: 20m x 2m 7.5m / 2 + 2m = 5.75m, which means 0.75m spare, so I could use the rain cover yurt roof thermal insulation: 3.4m x 0.35m - 1.4m yurt wall thermal insulation: 15m x 1.6m 3.4m + 1.6m = 5m, which means the thermal insulation I could use as well, since I don't need to cover the skylight, I even end up with 20cm spare. so I could actually reuse the rain cover and thermal insulation of the yurt for the geodesic dome as well, terrific - yet, the rain cover won't fit as nicely as a leaf-like fitted rain cover, maybe I end up at least to compose the dedicated rain cover nevertheless. 11. 2. 2007: Adding Connectors LDPE connectors added on 30 struts Due the some impreciseness in the cutting, e.g off by +/- 2-7mm, I decided the remeasure the struts with the attached LDPE half pipe connectors, and drill the end holes according the precise length to get again as precise as possible (+/- 1mm which is my goal): The dhole is 2.75cm, which adds to 5.5cm - hole to hole distance: A = 74.6cm + 5.5cm = 80.1cm B = 87.9cm + 5.5cm = 93.4cm C = 87.7cm + 5.5cm = 93.2cm D = 93.5cm + 5.5cm = 99.0cm E = 97.3cm + 5.5cm = 102.8cm F = 89.0cm + 5.5cm = 94.5cm Working on the struts So I follow this procedure per strut: drill 1 hole 1.25cm off the both ends into the bamboo sturts drill 1 hole 1.00cm off the end of the LDPE half pipe attach the LDPE half pipe with a cable binder remeasure the total "hole to hole" length and mark the final 2 holes in the LDPE half pipe drill the holes accordingly into both LDPE half pipes cut the LDPE half pipes (pointing) Drilled hole into bamboo 2007/02/14 12:42 Drilled hole into connector, cable binder fixating connector with bamboo 2007/02/14 12:44 Remeasure entire strut (incl. connector), and mark hole-to-hole, and drill holes then 2007/02/14 12:46 Cut pointing ends 2007/02/14 12:47 It's a bit time consuming this way (assembling 15 struts per hour), but this way I reclaim the preciseness I want to target. Even though the LDPE half pipe is 3mm thick, and most 6-way connectors add 6x 3mm = 18mm variance per 6-way connector, I don't want inpreciseness already in the struts add to the additional expected inpreciseness I cannot compensate that easy or well. 3. 2. 2007: Starting with Cutting Struts About to cut 250 struts from apprx. 130 bamboo sticks. After 2-3 hours and almost no waste, 250 struts done. As next I tape the ends before drilling the holes on both ends, and then seal the cut and holes with a finish so no moisture can enter the bamboo. Aprx. 130 bamboo sticks (182-185cm long, 10-18mm thicker ends), and 15m LDPE pipe (18mm/25mm) 2007/02/03 12:04 Laying out the 60 sticks, marking C+D 2007/02/03 13:08 A, B, C, D, E and F struts cut 2007/02/03 15:04 All endings taped (25mm tape) 2007/02/04 17:23 22. 1. 2007: Calculation As I concluded in the notes on the 4V 4/8, 60x C+D, 5x D+D, 30x A+E, 30x B+F gives the least waste. Where as 2 D determines the longest. As I want to have it closely to 6.4m diameter as my yurt, and the connector tests I made, I have following: 2D = 187cm (even though my bamboo is only 182cm) with dhole = 2.75cm, therefore 6.328m diameter: A = 74.6cm B = 87.9cm C = 87.7cm D = 93.5cm E = 97.3cm F = 89.0cm Now, 2 D = 187cm is longer than my sticks, and I have a total of 139 bamboo sticks, all between 182-184cm, majority 182cm, a few 184cm. So, I'm making 10x D from one stick (wasting 10x 182-93.5 = 10x 88.5cm). So the final cuts (apprx. 5mm per cut away) are like this: 60x C+D = 60x 87.7+93.5 = 60x 181.2 (no waste, 1 cut) 10x D = 10x 93.5 (10x 88.5cm waste, 1 cut) 30x A+E = 30x 74.6+97.3 = 30x 171.9cm (30x 10cm waste, 2 cuts) 30x B+F = 30x 87.9+89.0 = 30x 176.9cm (30x 5cm waste, 2 cuts) total 60+10+30+30 = 130 sticks (5 more than optimal), this gives me 9 sticks spare - which means I need to pay close attention when cutting and especially drilling the holes into the bamboo (only push drilling softly in order to avoid bamboo to split) and I will tape each bamboo end. The Connector The connector will be like this: Pipe Connector Detail 60mm total length common 22.5mm length of the bamboo/LDPE: offset 12.5mm for hole in bamboo 1st offset 10mm for 1st hole LDPE (bamboo hole) 2nd offset 10mm for 2nd hole LDPE (connecting hole) which gives dhole = 60-27.5-10 = 27.5mm 2007/02/02 11:58 2007/02/02 12:00 2007/02/02 12:04 2007/02/02 12:06 Since I have 250 sticks, with 500 endings, and I use half pipe, I require 500/2 * 0.06m = 15m pipe, inner diameter 18mm, 3mm thick therefore 24-25mm outer diameter. The Door Door Options for 4V 4/8 Not yet decided which door option, most likely yellow option. The pink and green option are too low. I make the final decision once I put up the skeleton and tried out which one is best. 21. 1. 2007: Tests with LDPE Pipe I realized I only need a half pipe, and thereby don't need to squeeze the pipe together, but stretch open the half pipe, also this way save further material. LDPE half-pipe with 2 cable binders (1) 2007/01/21 16:32 LDPE half-pipe with 2 cable binders (2) 2007/01/21 16:32 LDPE half-pipe with 2 cable binders, connecting (1) 2007/01/21 16:57 LDPE half-pipe with 2 cable binders, connecting (2) 2007/01/21 16:58 So far I made a 3mm holes through the bamboo and the half-pipe, and used two 3mm wide cable binders. Another more simple binding, with a longer cable binder 3mm wide and wind around 1 1/2 times. LDPE half-pipe with 1 cable binder (1) 2007/01/22 10:02 LDPE half-pipe with 1 cable binder (2) 2007/01/22 10:02 2007/01/22 10:08 With a M4 screw to connect them then. Conclusion: using 1 cable binder approach, but with 4mm wide cable binder will do it. I will do some strength / stress tests with weights to see how much pull it can handle. Next Page >> Page << Prev | 1 | 2 | 3 | 4 | Next >> Content: Page 1: 2014: 5m 2v Icosa, The Numbers, The Details, Connector, Skylight, Door, Cover, Interior, 2006: 6.3m 4v Icosa ... Page 2: The Diary, 20. 01. 2015: Little Snow, 18. 01. 2015: A Bit Snow Again, 15. 01. 2015: Struts Replaced & Canvas Put Up Again ... Page 3: 20. 2. 2007: Planning Pitch Up, Take Down & Storage, 19. 2. 2007: Completed Struts, 11. 2. 2007: Adding Connectors ... Page 4: 18. 1. 2007: Starting with Planning, 10. 9. 2005: Building 4V 4/8 Model, 30. 8. 2005: Building 2V & 3V Model ... Home   ·   About   ·   Tipi   ·   Yurt   ·   Dome   ·   Features   ·   Gallery Print   ·   Bookmark Creative Commons (CC) BY-SA-NC 2005-2017, developed, designed and written by René K. Müller Graphics & illustrations made with Inkscape, Tgif, Gimp, PovRay, GD.pm Web-Site powered by FreeBSD & Debian/Linux - 100% Open Source