Building a hub generator for geodesic

[Florian]

Hi,

Just discovered this group while looking for answers to my questions

I'm trying to give community a tool for 3d printed hub for 1V to 5V geodesic dome.

My understanding of advanded geometry case is kind of limited, but i have a good mechanical vision.

Here's the project : https://www.thingiverse.com/thing:6244858

I come to you for a question about Dihedral angle if i use to good word for what i mean.

Simply explained, from a top view of the connector, the angle between each branch.

I figured that they were not equal on each hub.

This page https://geo-dome.co.uk/article.asp?uname=hub_making giving some for 3V 3/8

But i would like to get the calculation method for any model like 3V 5/9 Kruschke or 4V or 5V.

Would you be able to point some ressources about this calculation ?

Thanks !

[Florian]

I think to correct word is : Radial Angle

That post would be something but attached quite hard to understand with the excel file :

https://groups.google.com/g/geodesichelp/c/JOVMOQLeOj4/m/7uxK04XtDQAJ

[lemondealc]

Hi Florian. I dig what you're doing. I just started working with CAD to improve my dome hubs, which are mass produced by BadgerPlug. Let's talk about it. I've been building domes for a couple years now. Shoot me a text if/when you're interested in chatting. 262-444-9785

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[Gerry in Quebec]

Hi Florian and Lemondealc,

Here's an image giving the radial, face and axial angles for the 3v icosa Kruschke dome. Florian, if you are interested in the  trigonometric equation for a dome's radial angles, let me know and I will post it, although it may not be in its simplest form. Do you use Excel or a similar spreadsheet program?

- Gerry in Québec

[Florian DUVAL]

Wow great !!

About how i pick up hubs and angles :

I hand-pickup every hub from dromerama visualisation (with possible human error from my side)

then i modify one of your old excel script and hand pick opposite strut to auto make Radial angle calculation (with possible human error)

Not the best !

Is there a possible calculation for Radial angle of each hub like yours ?

I would like alse to calculate number of connector of each type

See attached the hack from yours

I'm happy that i found same angle as the ones your provide !!!!

[9.49, 11.02, 12.16, 12.74],
[  
["5AAAAA", [72, 72, 72, 72, 72], 360, 0, 0, 0, 0, 0], // x6

["6ABCDCB", [55.51, 64.49, 60.00, 60.00, 64.49, 55.51], 360, 0, 1, 2, 3, 2, 1], // x20
["6CCCCCC", [64.72, 55.28, 64.72, 55.28, 64.72, 55.28], 360, 2, 2, 2, 2, 2, 2], // x20

["CCCC", [64.72, 55.28, 64.72], 180, 2, 2, 2, 2],           // x5          
["BCDC", [64.49, 60.00, 60.00], 180, 1, 2, 3, 2],           // x5        
["CDCB", [60.00, 60.00, 64.49], 180, 2, 3, 2, 1],     // x5
],
[.329706, .382290, .421489, .441056 ], // Chord factor for door connector calculation

Florian DUVAL

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[Gerry in Quebec]

Here's an image giving trig equations for calculating radial angles in a geodesic dome.

- Gerry in Québec

[Florian DUVAL]

Thanks a lot for all these informations !

Florian DUVAL

To view this discussion on the web visit https://groups.google.com/d/msgid/geodesichelp/50cd1357-76d3-4532-b6da-36249661fb35n%40googlegroups.com.

[lemondealc]

Florian,

You won't find my hubs on domarama, but I think you'll like them. 

Here is a link to my YouTube channel.

https://www.youtube.com/@lemondealc

Let me know what you think! 

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