Plydome

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Biagio Di Carlo

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Dec 4, 2012, 9:56:55 AM12/4/12
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Hi Taff,
please where I can find the dimensions  and the distances of the holes 
in the flat rectangular sheets of the geodesic plydome?
-Biagio


TaffGoch

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Dec 4, 2012, 4:57:22 PM12/4/12
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Biagio,

If you are referring to the "Plydome" that I posted in the 3D Warehouse...


...there are no holes in the plywood sheets.
____________________

Is this the plydome to which you refer?

-Taff
Plydome.jpg

Paul Kranz

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Dec 4, 2012, 9:15:13 PM12/4/12
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Here's a real plydome.

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Very high regards,
 
Paul sends...

Picture 075.jpg

nuconz

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Dec 4, 2012, 9:43:46 PM12/4/12
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pretty awesome!

love to see interior photos.

Biagio Di Carlo

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Dec 5, 2012, 3:42:40 AM12/5/12
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Yes is this the plydome to which I refer.
There is only one or more  rectangular modules?
What are the measurements inside the module?
bdc



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<Plydome.jpg>

Paul Kranz

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Dec 5, 2012, 8:04:26 AM12/5/12
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Nuconz:
 
Sorry, but that is the only photo I have of that building. I am told it has a geodesic substructure and that the plywood sheets were soaked in something to make them more pliable before they were secured to the dome.
 
Paul sends...

nuconz

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Dec 5, 2012, 10:17:24 AM12/5/12
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any idea when the photo was taken?


On 12/05/2012 08:04 AM, Paul Kranz wrote:
Nuconz:
 
Sorry, but that is the only photo I have of that building. I am told it has a geodesic substructure and that the plywood sheets were soaked in something to make them more pliable before they were secured to the dome.
 
Paul sends...

 
On Tue, Dec 4, 2012 at 9:43 PM, nuconz <nuc...@gmail.com> wrote:
pretty awesome!

love to see interior photos.


On 12/04/2012 09:15 PM, Paul Kranz wrote:
Here's a real plydome.

On Tue, Dec 4, 2012 at 4:57 PM, TaffGoch <taff...@gmail.com> wrote:
Biagio,

If you are referring to the "Plydome" that I posted in the 3D Warehouse...


...there are no holes in the plywood sheets.
____________________

Is this the plydome to which you refer?

-Taff
--


Paul Kranz

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Dec 5, 2012, 12:04:06 PM12/5/12
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I took a picture of that picture about thirty years ago and then made a J-peg out of it. I think the book was called Geodesics, but I'm not sure.
 
Paul sends...

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Dick Fischbeck

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Dec 5, 2012, 1:39:03 PM12/5/12
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Plydomes are "self strutted." Each sheet has 5 bends. One is at each corner and one is across the middle.

http://www.google.com/patents/US2905113


On Wed, Dec 5, 2012 at 10:17 AM, nuconz <nuc...@gmail.com> wrote:

nuconz

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Dec 5, 2012, 1:51:35 PM12/5/12
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that makes sense.  the lady's attire seemed "dated".

TaffGoch

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Dec 5, 2012, 2:22:36 PM12/5/12
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Dick is quite right -- The structure is a "shell" only construct.

With modern glues/adhesives, such construction would be much more robust today, compared to 1959.

1959 U.S. patent:

patent 2905113.png
US2905113.pdf

TaffGoch

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Dec 5, 2012, 2:25:20 PM12/5/12
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Biagio,

A sheet of plywood, in the U.S., has a standard-size of 4x8 feet

I used that dimension, when "assembling" this 3D model

TaffGoch

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Dec 5, 2012, 2:33:58 PM12/5/12
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D42l-94-107.jpg

Biagio Di Carlo

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Dec 5, 2012, 4:07:29 PM12/5/12
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About the  Fig. 3 on his patent, Fuller says:
... The sheets are now marked , or perforated for the fastenings, following the designs laid out as above....

Probably  with SUp we can get:
- how many different basic modules we need to construct the self-strutted geodesic plydome,
  maybe only one?
- what is the exact disposition of the 9 rectangular sheets in the maxi -module (angles)?
- where  we have to mark or perforate the rectangular modules?

bdc





Dick Fischbeck

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Dec 5, 2012, 4:13:48 PM12/5/12
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In a plydome, each sheet is two triangles. The bends are cylindrical and form the struts. 1/4 inch thick marine plywood is Steve's preferred material. 3/8 inch thick is not flexible enough. 

The randome is the cousin to the plydome. In a randome the struts are also cylindrical bends but are vertex to vertex, and only come in to being when two vertex elements are connected. A triangle is created between any 3 vertex elements. There are no holes at the vertexes like in the plydome. Both are wonderful structures. One is simple.

Hope that makes sense.

TaffGoch

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Dec 5, 2012, 4:15:59 PM12/5/12
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Biagio,

Positioning is in the model, which is full-scale, so measurements can be taken directly from the model.

(I purposely included bolt-holes; one for each "corner."

Dick Fischbeck

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Dec 5, 2012, 4:17:30 PM12/5/12
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I think Steve will supply the data (if he is in a good mood). I don't know why he took his beautiful wedsite down.

I'll call him and see if he is checking his email.

TaffGoch

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Dec 5, 2012, 4:22:09 PM12/5/12
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Here, you can see the "bends" in the thin plywood. (You don't want sharp "folds.")

The bends correspond to the edges of a class-II, 6v geodesic tessellation.

Note Dick's description, above, about each sheet of plywood covering two triangles (with overlapping corners, of course.)
Plydome bends.png

TaffGoch

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Dec 5, 2012, 4:25:43 PM12/5/12
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By the way, to see the bends in SketchUp, turn on "hidden line" visibility, using "View > Hidden Geometry" in the menu-bar.

Biagio Di Carlo

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Dec 5, 2012, 4:28:58 PM12/5/12
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Now I will try, thank you Taff.
bdc




On 5 dic 2012, at 22:25, TaffGoch wrote:

By the way, to see the bends in SketchUp, turn on "hidden line" visibility, using "View > Hidden Geometry" in the menu-bar.

TaffGoch

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Dec 5, 2012, 4:29:21 PM12/5/12
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Note that this class-II,6v tessellation, using 4x8-foot plywood, will produce a dome 40+ feet in diameter.

A class-II, 4v dome, also using 4x8-foot plywood, should be much easier to manage.

Dick Fischbeck

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Dec 5, 2012, 4:32:10 PM12/5/12
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Steve is "out of the offices" for a couple of days so hopefully he will write when he returns. Turns out he didn't remove his website. It just got lost when he changed servers. So we may get it back someday.

Biagio Di Carlo

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Dec 5, 2012, 4:33:36 PM12/5/12
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Thank you Dick !



TaffGoch

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Dec 5, 2012, 4:34:47 PM12/5/12
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Steve Miller also built a plydome, using the class-II, 4v tessellation, producing a 17' diameter dome:



D17-88-75.jpg

Biagio Di Carlo

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Dec 5, 2012, 4:40:14 PM12/5/12
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More simple and very beautiful







On 5 dic 2012, at 22:34, TaffGoch wrote:

Steve Miller also built a plydome, using the class-II, 4v tessellation, producing a 17' diameter dome:




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<D17-88-75.jpg>

Dick Fischbeck

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Dec 5, 2012, 5:13:49 PM12/5/12
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Construction pictures of the 42 footer at bottom here.

Pavel Brayvo (domesworld.ru)

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Dec 6, 2012, 2:32:43 AM12/6/12
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Here is topic about Plydomes from Domesworld.ru:
http://forum.domesworld.ru/viewtopic.php?f=2&t=478

Google-Tranlation: http://goo.gl/vT5rY

Hi All!
pb
///

4.12.2012 г., 18:56:55 UTC+4 biagiodicarlo написал:

Hi Taff,
please where I can find the dimensions  and the distances of the holes 
in the flat rectangular sheets of the geodesic plydome?
-Biagio

And-Ray

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Dec 6, 2012, 7:47:14 AM12/6/12
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Hi all.

This is my paramentric 3D model of plydome.
Diameter dome 7.6 meters. This size is chosen based on a sheet of plywood (1.525 X 1, 525 m), which are produced in Russia.
One half of the sphere. Only 160 parts.
68 sheets of plywood.


See pictures and ask your questions.

вторник, 4 декабря 2012 г., 18:56:55 UTC+4 пользователь biagiodicarlo написал:

Katrina Fairley

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Dec 9, 2012, 1:09:50 PM12/9/12
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The Photo appeared in several books. This is from Geodesics by Edward Popko.  The Dymaxion World of Buckminster Fuller by Robert W. Marks includes several different versions of the Plydome.  My father, TC Howard did a lot of experimenting with plywood for the Plydome.  Wong dissertation is also very informative.  I scanned the four pages in Geodesics.
Plydome0001.pdf
Plydome0002.pdf

TaffGoch

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Dec 14, 2012, 12:02:05 AM12/14/12
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"Better Homes & Gardens" - 1957

This is the photo that I examined, to determine class & frequency, when starting my 3D model.
fuller7[3].jpg
fuller7[3] freq {3,3}.jpg

And-Ray

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Dec 15, 2012, 7:27:54 AM12/15/12
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I analyzed this picture and created a rough 3d model.

Assuming the height of the door 2m have identified key dimensions of the elements.

It is interesting that the base icosahedron is oriented relative to the horizon in an unusual way. I suppose it's so convenient to make the entrance to the house.



Top view

Front view



пятница, 14 декабря 2012 г., 9:02:05 UTC+4 пользователь TaffGoch написал:

And-Ray

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Dec 15, 2012, 9:30:29 AM12/15/12
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I found one more reason this orientation of the icosahedron.

The bottom sheets of plywood sheets are cut very convenient and economical.




TaffGoch

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Dec 16, 2012, 5:48:09 PM12/16/12
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The Class-II, 4v tessellation produces a hemispherical dome that is 14' tall, 28' diameter, when 4x8' sheets of plywood are used.

As indicated earlier, this size dome is easier to manage, and would better support a snow-load (due to tighter sphere curvature, and thicker shell, relative to diameter.)

-Taff
Plydome; class-II, 4v.png

Biagio Di Carlo

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Dec 17, 2012, 2:23:47 AM12/17/12
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Dear Taff,
please can you add the SUp file
with the planar modules for 
constructing a model of  the plydome?
- Biagio




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<Plydome; class-II, 4v.png>