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| Title: | Dome Angles | |
| Posted on: | 8/28/2008 10:10:59 PM | |
| Category | Dome theory | |
| Author | simon | |
| Status | Open | |
| Views | 14093 | |
| Replies | (6) | |
Hi, I''m planning on building a 16'' dome out of salvaged timber as a communal allotment shed. I''ve found this site really helpful but I haven''t found all the various angles in one place. I''ve calculated the angles and I wondered if anyone could confirm they''re right.
A B a~ b~ a- b- a b a'' b'' a^ b^ .6180 .6180 36.00 36.00 72.00 72.00 60.00 60.00 79.19 79.19 63.43 63.43 .6180 .5466 36.00 31.72 72.00 74.14 68.86 55.57 82.78 78.77 71.99 58.29 .4036 .4124 23.28 23.80 78.36 78.10 58.58 60.71 82.77 83.21 60.00 62.16 .4036 .3486 23.28 20.08 78.36 79.96 70.71 54.64 85.87 83.73 71.98 55.70The first two rows are for the 2v dome, the last two for the 3v dome. For both the 2v and 3v dome the B and C dimensions are the same so I’ve just tabulated the A and B dimensions for the two panels of each of the two unit-radius domes. The diagram shows a panel construction, and assumes the top and bottom of the panel frame are beveled, but all the angles are there for a hub construction too. So A is the strut length, a~ is the angle subtended by the strut at the origin, a- is the angle the strut makes at the hub axis, a’ is the chamfer angle of the top face of the panel frame, a is the angle between the arms of the panel frame in the plane of the panel, and a^ is the angle at which the struts radiate from the hub. |
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| [ Comments 6 ] |
| posted by admin | 31/08/2008 01:15:15 |
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OK the angles for a 4.88 meter diameter 3v dome. Start with the dome calculation tools..this gives you the angles for both triangles needed. Strut 'A' length : 857mm Strut 'B' length : 993mm Strut 'C' length : 1015mm Diameter : 4.88 diagram here:  Respective diheral angles are like this:  |
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| posted by Colin | 31/08/2008 11:45:58 |
| The calculations look ok to me. I do think Paul`s layout would be easier to use as a reference while cutting the panels :) I wish i had tools (and eyesight) that could cut angles accurate to a few hundredths of a degree ;) | |
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| posted by simon | 31/08/2008 23:53:08 |
| I´m feeling sick ... | |
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| posted by simon | 20/10/2008 13:06:23 |
| malmısın lşannnn itoglu it | |
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| posted by jacques | 05/01/2009 00:15:39 |
| I am wondering how to use these figures, I am making a model of a geodesic sphere out of 3/8" thick wood triangle panels, I dont know quite how to apply dome theory to my design, but the only information I really need is the bevel angles of each side of the wood for my a, b, and c struts, thanks for any info | |
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| posted by leonardo | 22/08/2011 16:33:33 |
| I m working on a 3V , 4/9 with 8.18 meter diameter made of wood triangulos panles. Both triangles sare the same lenght on the base. Do they sare the same dihedral angle ?? or the base of the triangle for the pentagon is 85 degrees and the one of the base of the triangle for the hexagon is 83 degrees? In the explanation on the article in this page called 7m diameter 3V basic dome plans you just indicate that the only one with 85 deree is the base of the pentagon and on the first comment on this thread you use the same angle for both bases of the triangles... ? I be very thankfully for an explanation , bye | |
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