bamboo dome

[Sebastián Aguilera]

Do you know this type of dome?

http://domodebambu.blogspot.com.es/

[Sebastián Aguilera]

Original instructions in English.

http://www.desertdomes.com/bamboo.html

[homespun]

WOW!  Big WOW!  -- Dan

 

From: Robert Clark

Sent: Friday, March 16, 2018 6:18 AM

To: Geodesic Help Group

Subject: Re: bamboo dome

 

Here's two pictures of another similar bamboo dome.  I don't know where it was built or what it was used for.

 

Robert

On Friday, March 16, 2018 at 1:30:00 AM UTC-4, Sebastián Aguilera wrote:

Original instructions in English.

http://www.desertdomes.com/bamboo.html

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[Ashok Mathur]

Dear Robert,

The bamboo dome that was originally given has the following distinctive features:

1 The bamboos are not cut to a strut size but are allowed to keep length beyond the strut size.

2. The hubs are not pre-cut but form naturally by the overlapping of the joints.

3. There are no separate hubs.

To me the two photos do not meet these criteria.

Regards

Ashok

Regards

Ashok

On Fri, Mar 16, 2018 at 5:38 PM, homespun <Uncl...@homespun4homeschoolers.com> wrote:

WOW!  Big WOW!  -- Dan

 

From: Robert Clark

Sent: Friday, March 16, 2018 6:18 AM

To: Geodesic Help Group

Subject: Re: bamboo dome

 

Here's two pictures of another similar bamboo dome.  I don't know where it was built or what it was used for.

 

Robert

On Friday, March 16, 2018 at 1:30:00 AM UTC-4, Sebastián Aguilera wrote:

Original instructions in English.

http://www.desertdomes.com/bamboo.html

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[Ken G. Brown]

I would say there is no need to delete dome photos, the more domes the better!

The bamboo ones are very interesting.

Ken

On Mar 16, 2018, at 17:26, Robert Clark <clark.rob...@gmail.com> wrote:

In accordance with failing to meet expected dome criteria, I have deleted the offending photos.

Robert

Regards

Ashok

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[Dick Fischbeck]

Robert, please put them back! After all, a hub is a vertex. Topology is universal.

[Ashok Mathur]

Dear Robert

Google Image search also located the two images at Indonesia, Bandung.

By studying it, it looks like a mix of hex pent and rotogerity.

Thanks

Ashok

Regards

Ashok

On Sat, Mar 17, 2018 at 5:26 AM, Robert Clark <clark.rob...@gmail.com> wrote:

Here's a construction video:

https://www.youtube.com/watch?v=1eXFtaTnXzQ

On Friday, March 16, 2018 at 7:46:02 PM UTC-4, Robert Clark wrote:

https://www.wanderant.com/#/items/86716-bandung-institute-of-technology/overview

https://taufikurahman.wordpress.com/2012/03/23/bamboo-shelter-project/

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[TaffGoch]

Two 4v (class II) nexorades/rotegrities, overlaid - one clockwise, one counter-clockwise:

The bamboo geometry/construction looks sturdy, doesn't it?

-Taff

[Dick Fischbeck]

Definitely more than twice as strong! Just by looking at it.

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[Ashok Mathur]

Dear Taff,

For simple playing around, two layers of 4v domes, will be a huge effort.

In many Chinese stores in Mountain View/ San Jose, you get 14 inches bamboo sticks which are quite strong.

100 of them cost about $ 1.20.  I can post pictures if this description is not clear enough.
The pointed end is a bit dangerous,so if that is cut off, then you get a maximum length of 13.5 inches.

To me they look good for nexorades.

What structure, similar to these double layer bamboo domes, can you model with the longest length of 13.5 inches?

Regards

Ashok

Regards

Ashok

[TaffGoch]

The conceptual image that I posted earlier was a quick, first approximation.
I've been working on a more-accurate 3D model:

Nexorade-geometry modeling technique:

Ashok, any nexorade, of similar-style rotation, can be comparably employed as mirror overlays (any class & frequency.)

-Taff

[Ashok Mathur]

Dear Taff,

While I have admired the nexorade models that you have generated, I have never got down to building one.

In an earlier set of messages between you and Dan, you had given details for a 3 different length nexorade, which Dan converted into a 2 lengths nexorade and posted built pictures.

Do you suggest that I build that first?

Regards

Ashok

Regards

Ashok

On Sun, Mar 18, 2018 at 11:14 AM, Sebastián Aguilera <seba...@gmail.com> wrote:

Thanks for showing us this dome. It's great.

Do you know where I can learn to do it?

El sábado, 17 de marzo de 2018, 0:56:50 (UTC+1), Robert Clark escribió:

Here's a construction video:

https://www.youtube.com/watch?v=1eXFtaTnXzQ

On Friday, March 16, 2018 at 7:46:02 PM UTC-4, Robert Clark wrote:

https://www.wanderant.com/#/items/86716-bandung-institute-of-technology/overview

https://taufikurahman.wordpress.com/2012/03/23/bamboo-shelter-project/

On Friday, March 16, 2018 at 7:34:04 PM UTC-4, Dick Fischbeck wrote:

--

[TaffGoch]

Ashok,

I would start simple, then graduate to more complex models.

You should, thereby, avoid frustrations that likely come with greater complexity.

-Taff

[TaffGoch]

Robert,

Here are the arc lengths:

(I suspect that you'll soon find this is not all the info you need to construct a physical model.)

As always, these arc lengths will produce a sphere of unit (1.0) radius.

-Taff

[Sebastián Aguilera]

Can I build a model with all the sticks of equal length to make this model simple?

I want to do it with this type of unions

[TaffGoch]

Robert,

The intersection/connection points are required information. Since each end of a slat has different connection intervals, end-over-end swap is not possible. Care must be taken to orient each slat; ends correctly aligned. Also, the center cross-over intersection is NOT in the slat center.

I haven't yet decided how to depict each slat, with connection-point designations and dimensions.


The total arc/slat lengths have changed. The earlier image-post was based on 4-segment arcs. These are based on 8-segment arcs.

-Taff

[TaffGoch]

Robert,

I think that I've sussed-out how the original design was easily developed.

Start with "bands" of same width, aligned on a pent/hex icosahedral tessellation...

...then draw diagonal arcs from band-edge intersections. Then truncate these arcs at the arc intersections.

This produces nice, uniform nexorade (small) triangles (at arc-end connections.)

You might be able to model, in SolidWorks, using this technique.

-Taff

[Sebastián Aguilera]

I have already made the pentagon of the first level. Do you think I can finish the dome with this system?

[biagiodicarlo]

There is my book too about reciprocal frames /nexorades:

http://www.lulu.com/shop/biagio-di-carlo/reciprocal-frames/paperback/product-22046629.html

- Biagio Di Carlo

www.biagiodicarlo.com

Il giorno 22 mar 2018, alle ore 14:16, Robert Clark <clark.rob...@gmail.com> ha scritto:

You might be interested in researching "Da Vinci domes", also.  These have a similar concept.

http://www.rinusroelofs.nl/structure/lg-bar-grid/st-bg-00.html

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[TaffGoch]

Sebastián,

When modeled, I got two different lengths, arranged like so:

You can get by with one bamboo length for all, BUT the connection/intersection points will be different for pent vs. hex slats.

-Taff

[Sebastián Aguilera]

Hello Taff.

First of all thank you very much for sharing your knowledge, I have marveled at the beauty of these connections.

What is the length of the two slats?

 The connection/intersection points will be different for pent vs. hex slats does it mean that with a length of bamboo the polyhedron is not so perfect?

[Sebastián Aguilera]

The ratio of the two lengths of the slats depends on the size of the rotating connection?

[TaffGoch]

Sebastián,

"What is the length of the two slats?"

"The ratio of the two lengths of the slats depends on the size of the rotating connection?"

Perseptive. Quite right. My model rotation uses 10° rotation of each nexorade (20° between paired slats.)

The above "dimensions" are arc-length factors that will produce a unit (1.0) radius sphere. The dimensions are measured between connection points. Add a little to each end, for a bit of overlap (amount of your choice.)

-Taff

[TaffGoch]

I've posted the 3D SketchUp model, of the Buckyball mirrored-nexorade, to the 3D Warehouse:

Buckyball Nexorade - Mirrored

-Taff

[TaffGoch]

Identical geometry (by Prof. Bando Takaaki) at a couple of additional workshops (many photos)

2013: Synergetics Workshop - INDUSTRIAL DESIGN LINZ


2016: Japanese university conducts workshop

I also found more-detailed photos of the connections. One nexorade is, literally, laid over the second, at the "hubs." There is no interweaving of slats at the hubs. The only cross-over weaving between the two nexorades is at the slat centers. This makes assembly much easier than I had originally presumed:


 

[Also note color-coding paint on slat ends and holes (under washers,) to aid in assembly.]

-Taff

[Gerry in Quebec]

Nice modeling, explanations & research. Thanks, Taff. 

It would be interesting to know to what extent the strut criss-crossing improves the overall strength of these hex-pent structures.

- Gerry in Québec

[Sebastián Aguilera]

Hello Taff, I've make a nexorade rotatory bambu dome

https://drive.google.com/file/d/1eNIpSHXNrP15TkvQxq9SDjq04ezFx4hD/view?usp=drivesdk

[Levente Likhanecz]

there is another nice one based on antiprism rotegrity geo_2_2_d (nexorade 84 (8,2)) 

gives a "clean" equatorial cut. 

[Levente Likhanecz]

made from this

[Al TeohGmail]

are they all the same lengths?

Thanks

Al

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Alvin S Teoh

[Levente Likhanecz]

nope, each color is a length, and 1/3 even split.

[Levente Likhanecz]

this geo_3_3_d model has 10 different strut length

On Thursday, March 15, 2018 at 8:21:39 PM UTC+1, Sebastián Aguilera wrote:

Do you know this type of dome?

http://domodebambu.blogspot.com.es/