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 Post subject: Excavated dodecahedron twisty puzzle
PostPosted: Sun Feb 23, 2014 2:40 pm 
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I had an idea for a twisty puzzle that I haven't seen made before. It is based on the excavated dodecahedron.

The outer edges match a dodecahedron, but each pentagon face is the base of an inverted pentagonal pyramid with equilateral triangles. Each set of 5 triangles would be one color.

I made some images to demonstrate what it would look like, and how it turns.

The puzzle would turn along the star shaped cut, in a way similar to the Oskar's Septic Twist:

http://youtu.be/ZqhneLC-4Zg?t=1m

I think it would effectively be a pyraminx crystal with only the edges, and no corners.


Attachments:
File comment: Plain
Excavated dodecahedron.png
Excavated dodecahedron.png [ 10.47 KiB | Viewed 1447 times ]
File comment: Colored
Excavated dodecahedron 2.png
Excavated dodecahedron 2.png [ 10.8 KiB | Viewed 1447 times ]
File comment: Turning
Excavated dodecahedron 3.png
Excavated dodecahedron 3.png [ 11.08 KiB | Viewed 1447 times ]

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Sun Feb 23, 2014 3:06 pm 
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I love that idea a lot.

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Mon Feb 24, 2014 12:22 am 
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That would be an edges only Pyraminx Crystal.
Darren Grewe wrote:
I love that idea a lot.
I second that.


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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Mon Feb 24, 2014 3:24 am 
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Andreas Nortmann wrote:
That would be an edges only Pyraminx Crystal.
Darren Grewe wrote:
I love that idea a lot.
I second that.

Ditto

I see an approach, although it is a streach.
Alexander's Star, with large pieces to form the excavedted dodecahedron shape, or a megamanx with lengthy extensions in the shape of the proposed shape. Or we can heavily mod a pyraminx crystal...

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Tue Feb 25, 2014 2:48 pm 
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Location: Russia
very interest idea :)
i drawing this puzzle today

Image

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Tue Feb 25, 2014 2:59 pm 
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Nifty! Do you think this is 'makable' grigr?

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Tue Feb 25, 2014 6:36 pm 
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Awesome. I was thinking of trying to design it myself using SolidWorks, even though I haven't done any 3D designs before.

I have a question. I actually got the idea from a sculpture I made several years ago. I had a few hundred popsicle sticks, and some hot glue. I made a bunch of triangles and glued them together, and it has been sitting in my room this whole time. Whenever I look at it, I imagine it rotating like the puzzle I described.

In your version, it looks like the triangles aren't equilateral, which means they don't go as far into the middle. Does the inverted angle using equilateral triangles not quite line up with the star shaped slice? In my sculpture, it looks like they do.


Attachments:
rsz_20140225_180727.jpg
rsz_20140225_180727.jpg [ 95.04 KiB | Viewed 1134 times ]
rsz_20140225_180807.jpg
rsz_20140225_180807.jpg [ 78.76 KiB | Viewed 1134 times ]

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Tue Feb 25, 2014 11:06 pm 
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Kattenvriendin wrote:
Nifty! Do you think this is 'makable' grigr?

yes

LeifEricson wrote:
Awesome. I was thinking of trying to design it myself using SolidWorks, even though I haven't done any 3D designs before.

I can send to you my SW-files
:)

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Wed Feb 26, 2014 12:16 am 
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edge size = 3cm. depth = 1cm

triangle: 3cm * 2.2 cm * 2.2 cm

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Wed Feb 26, 2014 6:19 am 
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Nice! I've been thinking about a puzzle with this shape for years and only recently I realised that this should be a edge-only pyraminx crystal. But I don't know Solid Works well enough to design it. Now I hope that it will be mass produced!


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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Wed Feb 26, 2014 8:55 am 
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Beautiful idea! I'm looking forward to seeing this one made into a physical puzzle. Hopefully someone is working on that!

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Thu Feb 27, 2014 9:13 am 
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I can try to make one :mrgreen:

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Thu Feb 27, 2014 9:41 am 
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I just realized how small the mechanism would be.
Attachment:
File comment: the version with equilateral triangles
Z indentedD 2.png
Z indentedD 2.png [ 21.85 KiB | Viewed 791 times ]

This is the shape I made
Attachment:
File comment: puny mech.
Z indentedD.png
Z indentedD.png [ 36.09 KiB | Viewed 791 times ]

the largest sphere that you can fit in here is the mechanism size.
I can make one with different geometric proportions.

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Thu Feb 27, 2014 12:12 pm 
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Putting aside the edges-only Pyraminx Crystal, how would the excavation affect the family of face-turning dodecahedra? What would the excavated versions of the megaminx, pyraminx crystal, starminx, pentultimate, and master pentultimate look like? Could they be made without significant alterations to mechanism. would the excavation create any new pieces not found in the family of FTDs?(I think a shallow enough megaminx cut would create stationary centers in the indentations).

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 Post subject: Re: Excavated dodecahedron twisty puzzle
PostPosted: Thu Feb 27, 2014 1:30 pm 
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Jeffery Mewtamer wrote:
would the excavation create any new pieces not found in the family of FTDs?(I think a shallow enough megaminx cut would create stationary centers in the indentations).

No amount of cutting into / shape modding a face turning dodecahedron will ever make any new piece not already found on the Multi-Dodecahedron (other than the core whose state / existence is already fully defined by the Megaminx centers).

To make new pieces you need to add other styles of cuts like circles, rings, zig-zag cuts, different cut depths on different faces, etc.

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