37 Replies Latest reply on May 30, 2018 7:26 PM by Mahmoud Abdelaziz

# hexgonal dome

Hi

This is my first post in this forum and am looking to get some help from anyone and everyone on here.
I am a graduate student at IUPUI and am trying to model a hexagonal dome for a class project but am having a hard time trying to get one made.
I've attached a picture here to give you an idea of what I'm trying to make, the idea is to have the hollow hexagons but at the same time the faces of the hexagons will have a certain width to them as this diagram is to be replicated in real life using cardboard.

I've mentioned some basic dimensions under here for your reference:

Dimensions:

Dia- 12 feet

Height- 6 feet

The dimensions are not my main concern for now, their just for a frame of reference.

I sincerely appreciate your help and guidance here.

Thank you

Best

Tushar Vahal

• ###### Re: hexgonal dome

Welcome to the forum.  Have you attempted to do this yourself?  If yes, can you post your attempt here?  Please see How can I attach a file to a forum post? and Can someone help me with my school assignment?.

• ###### Re: hexgonal dome

Well that's the problem, I'm able to make a hollow dome or just a hexagon or a hollow dome with a single hexagon pattern but, have am not able to create a whole pattern of hexagons on it.
I can create a circular pattern of hexagons but that just happens on a flat plane or surface, I don't know how to do it on a spherical body.

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I've never made anything like that either, but it seems to me that you have two choices:  make a single hexagon and then insert multiple instances in an assembly, mated to produce the desired result (which would create a hollow more-or-less sphere), or create a sphere and flatten the sides to produce the hexagonal surfaces.

I don't see how patterns could help you here, but someone else might have some other ideas.

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Not a problem
will try and figure something out.
Thank you for your inputs, much appreciated.

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Hi Tushar

You sure they're all hexagons?

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nope
This is for reference, I picked it off of google to give you guys a picture to relate to.
But I've even tried doing the same thing, that is trying to incorporate pentagons in between so that the faces don't over lap since thats common with hexagons.

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Nice catch Rob!!!

Chris

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If you can make a dome in the shape you desire... make a 3D sketch and convert edges... make a weldment and use 3D sketch to make structural member feature.

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Tushar,.. if you use Sketchup or can convert a Collada file.. there are some poly models online which may help.. (link..)

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Thanks will look into that and see if I can make some use of it.

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MeshLab is great at doing this stuff too

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Kewl!

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MeshLab is mega-kewl.  You can export as STL to bring into SW.

Pretty sure there's some 5 & 6agons in all them triangles

• ###### Re: hexgonal dome

already been through them, but my problem needs hollow hexagons
not just a pattern in a solid surface

• ###### Re: hexgonal dome

Tushar, to add to what others have said ... I've searched through the "Weekly Power User Challenge" series and have been unable to find what I was searching for but it may be of some assistance if someone can recall what I could not.

At one time we had a similar challenge but it was based on populating the surface of a sphere with balls through mates/patterns or any way possible. There were some very creative ideas contained in the post I just can't seem to find it ... Good luck with it, looks like an interesting project.

Edit: Found it, hope it's helpful ... Creating a feature circular pattern with spheres.

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John Pesaturo ... ah ha!.. I thought I had seen something like this before... clever Rob Edwards

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I've been through this post and some others before posting here, but its still not soled my problem.

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I was playing around one day and made a soccer ball by assembling the hexagons and pentagons.

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how about doing sketch of hexagons, and then project it on the dome, to start with? would that do?

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Hello Wojciech Paterski ,..  I was thinking the same yesterday (using 2014).. pattern (24x24 hex) and then doing a radial Flex in both directions (~sphere).. (image attached)

..alternate in 2017, create a closed sketch from the pattern (,..select all inner loops..wow, it's pretty intense... SW is so darn SLOW with 2D sketches.. and runs low in MEMORY!  geez.) and then do a Wrap on a half-sphere.

• ###### Re: hexgonal dome

this might just work...
I wasn't aware we could do such a thing. I'm gonna give this a shot today.

Thank you

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Wow.....to say that I am amazed at this would be an understatement.

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Hello Paul

Thank you for the amazing description

I kinda have the same problem, only mine is a little bigger

I want to create a pattern of hexagons on a mushroom like dome, so that the final shape would be like the attached photo with red mushroom like mesh

I tried creating a 2D sketch with hexagonal patterns and projecting it on the surface with split lines, then converting edges into a 3D sketch, but you can see the distortion on the edges (too bad), also how can I convert a 3D sketch with hundreds of curves into a structure with circular cross section of 2 mm

Can you help me with that?

also can you attach the solidworks files for the flexing you did? I can't follow your footstep from the images you attached

Thank you

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Hello Mahmoud,.. sure,.."if" I can find it?

..I'll attach the file above.. so it's with the context of the image.

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I succeeded to do the flex thing, it works well for the upper surface of the dome, but what about the under surface? (the underside of the mushroom), what can I do for make the shape continous? I'm attaching the solidworks model so you can take a closer look

Thank you

https://1drv.ms/u/s!Apfy2EswT_yKikb8yJD3TQSK5dNP

• ###### Re: hexgonal dome

Hello Mahoud,.. well, that is going to be not so easy... what maybe easier is doing what was suggested in the thread above..?

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btw,.. did you try Wrap?... seems to work.. (image attached)

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I am trying to offset the sketch hexagons but solidworks is taking too long, more likely to crash.. can you send me the solidworks file back after offsetting the sketch? appreciated

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Wrapping did work !! Thanks a lot Paul

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Glad it works!... and yes... selecting the edges or inner loops with SolidWorks.. forever and a day... it's weak point for sure!

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Yea tell me about it !! No luck transforming the thickened surface into a circular cross section though.

I did try filleting but my Laptop crashed again I bought a brand new workstation with a Xeon CPU and Nvidia Quadro GPU so that shit won't happen !!

• ###### Re: hexgonal dome

Hi Tushar,

Geodesic designs come in many forms and functions. See link below for some good basic information.

https://simplydifferently.org/Geodesic_Dome_Notes#Table of Content

For the design to work you need sub-divide it into appropriate sections. The following one I did was a V10 - 60ft dome made of simple 2 x 4 lumber that are pre-assembled into a set of triangles structures.

This can be quite involved depending on the level of detail you want. See the 3D pdf for general overview and how the dome was split into sub assemblies for pattern purpose but also to facilitate assembly.

SSP starts as a icosaeder

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I would like to give this a try as well. There seems to be an issue with the pdf though, its blank.

Although the link might be of some help.

Thank you.

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Hi Tushar,

The pdf isn't blank. Its a 3D pdf so you need to choose from the options first then click in the white space of the page to load the model.

• ###### Re: hexgonal dome

Thank you all for your valuable input.
Got some great ideas and advice out here, much appreciated.

Best

Tushar Vahal

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I'm trying it as we speak, what did you do? offset all hexagons in the sketch and then wrap it?

is there a way to make the hexagons with circular cross section instead of rectangular?