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 Post subject: Rainbow Octahedron
PostPosted: Sat Jan 12, 2008 3:41 pm 
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As is explained in the article on his puzzles (http://twistypuzzles.com/articles/spotl ... rgen.shtml), Jürgen Brandt was the first to make a prototype of a face-turning octahedron.
He also proposed to a make such a puzzle using a rainbow cube.

Lateron, the beautiful Dino Octa was invented and made by Katsuhiko Okamoto.
More recently, the topic was also discussed at this forum.
viewtopic.php?t=8478&highlight=rainbow

Having seen Jürgen Brandt’s face-turning octahedron myself, it has been a long-time wish for me to make such a puzzle.
It was already explained by Jürgen that the pieces of such a puzzle need to be hollow.
I used some thin V-shaped pieces of plastic that were cut and glued onto a rainbow cube.

To allow the movement of the faces, the triangular plastic pieces needed to be chamfered.
The V-type plastic pieces require to be rounded.

Assembling the puzzle is relatively easy.
However, turning of the faces is still rather difficult.
The puzzle is blocking movements at too many places and the pieces of the puzzle need to be adapted.
I can only consider the present puzzle to be a rough prototype that can be used for studying the puzzle and adapting it into a playable puzzle.
I nevertheless wanted to share these preliminary results with you.

Geert


Attachments:
Plastic pieces.jpg
Plastic pieces.jpg [ 13.33 KiB | Viewed 5412 times ]
Pieces glued to the rainbow cube.jpg
Pieces glued to the rainbow cube.jpg [ 16.14 KiB | Viewed 5412 times ]
Assembled Rainbow Octahedron.jpg
Assembled Rainbow Octahedron.jpg [ 15.46 KiB | Viewed 5412 times ]
Rainbow Octahedron .jpg
Rainbow Octahedron .jpg [ 16.34 KiB | Viewed 5408 times ]
Twist.jpg
Twist.jpg [ 17.06 KiB | Viewed 5409 times ]
Midtwist.jpg
Midtwist.jpg [ 19.16 KiB | Viewed 5405 times ]
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 Post subject:
PostPosted: Sat Jan 12, 2008 4:00 pm 
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Looks very nice Geert! Even as a rough prototype!

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 Post subject:
PostPosted: Sat Jan 12, 2008 4:03 pm 
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I like it, nice job! I wish I had a rainbow cube! :(

Adam

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 Post subject:
PostPosted: Sat Jan 12, 2008 4:05 pm 
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Looks very nice. I gather it's not build for speedsolving. I think this reminds me of a edges only Trajber's Octahedron.

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 Post subject:
PostPosted: Sat Jan 12, 2008 4:11 pm 
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Geert

Is nice to see new prototypes here.


congrats. :wink:

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 Post subject:
PostPosted: Sat Jan 12, 2008 5:49 pm 
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There goes my idea for a new build.

Another thing to do would be to make the tips twistable as well adding more of a challenge.

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 Post subject:
PostPosted: Sat Jan 12, 2008 6:11 pm 
That is stunningly beautiful!


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 Post subject:
PostPosted: Sun Jan 13, 2008 2:37 am 
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Posts like this are the reason I love visiting the twisty puzzles forums.
What a magnificent puzzle!

Geert, thank you for sharing this with us.

:)


Pantazis

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 Post subject:
PostPosted: Sun Jan 13, 2008 4:30 am 
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One again was somebody faster than me, ... :(
But Geerts is far superior.


Attachments:
File comment: Will it ever be finished. Now more unrealistic than ever.
DSC02000.jpg
DSC02000.jpg [ 13.17 KiB | Viewed 5257 times ]
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 Post subject:
PostPosted: Sun Jan 13, 2008 9:48 am 
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Location: Hong Kong, China
The first time I saw it: Very nice mod!

Second time I saw it: Hey the outcome is very similar to an edges only 3x3

You still have done a very good job, I can only build this kinds of mods in my dreams, considering I only have superglue, a hand saw which saws off 1.5mm of plastic after sawing a piece into 2 :lol:


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 Post subject:
PostPosted: Mon Jan 14, 2008 2:10 pm 
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Location: Canada Qc City
Nice job, I really like it. is it hard to build . Anyway, nice job on it!


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 Post subject:
PostPosted: Mon Jan 14, 2008 4:21 pm 
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Thank you for all the nice comments.
To answer Simon (and Marco), the puzzle is actually relatively easy to build.

I used a plastic strip which can be bought in a version in which the strip is bent at a 90 degree angle, resulting in 2 ‘attached’ perpendicular strips, each with a width of 30 mm.
The thickness of the strip is 1 mm, which means that it can either be cut with a knife or cut by using an ordinary pair of scissors.
The pieces are cut in the way shown and the 90 degree angle is enlarged (bent) to fit over the rainbow pieces.
A bit of superglue and the puzzle is basically finished.
So it is relatively easy and relatively quick to make.

There are a couple of disadvantages/problems with the puzzle.
The main problem is that the tips get hooked around the other tips.
The second problem is the stability of the thin ‘overhanging’ strips.
This can be improved by using thicker plastic strips and/or by filling the pieces.
Filling the pieces, however, has to be done in such a way that the movement of the other pieces is not blocked.

The best way appears to be to start with solid pieces and to hollow these out.
The outer dimensions of the solid pieces should be:
- square base of 20mm*20mm
- (perpendicular) height of 20mm*sqrt(2)
-> short edge diagonal = 20mm*sqrt(3)
-> long corner diagonal = 40 mm

Using solid pieces as a start will result in flat planes at the points where the pieces meet.
The way in which the pieces should be hollowed is, however, rather peculiar (due to the movements of the pieces).
So, because of this, it appears best to design the pieces using 3D modelling.
The advantage is that only a single piece needs to be designed.

Geert


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 Post subject:
PostPosted: Mon Jan 14, 2008 5:21 pm 
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After the puzzle has been built you can always rotate a face mid-turn and then pour in some two part epoxy. Pour in enough to give the piece some stability but not enough to interfere with movement.

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 Post subject:
PostPosted: Tue Jan 15, 2008 8:16 pm 
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Location: Webster, NY
Hi All,
Geert had let me know of his desire to make this design and had asked if I could look into it. I have been out of touch recently but was glad to see he had made one. I just finished one myself. Below is the .stl file of the end piece if others want to have one of the endpieces made (or all 24 for that matter) I used FDMONLY.com but you can use whichever you want. The file is in INCHES if your rapidprototyping company needs that info To look at the shape of the stl file, there are free readers available, just google them.
I made mine by having one end piece made (the white one) and duplicating twice and making one complete edge piece and then duplicating that 12 times (the black piece). The piece has only the amount internally removed that is necessary for turning.
My complete edge piece has a slight angle to the center of the triangle because I added a little to much fill material to smooth the seam between the two end pieces and the rainbow piece. I like it that way though so no harm. I am also including the dxf file for cutting stickers for those with sticker cutters.

I am happy with the way it turns. The shape of the interior of that end piece is odd and interesting to see it just clear as it turns.

Lee


Attachments:
File comment: DXF sticker file
RPO sidesticker.zip [3.77 KiB]
Downloaded 231 times
File comment: .stl file of endpiece
RainbowOctahedron.zip [13.07 KiB]
Downloaded 193 times
CornerpieceRBO.jpg
CornerpieceRBO.jpg [ 47.02 KiB | Viewed 2825 times ]
RotangleRBO.jpg
RotangleRBO.jpg [ 72.11 KiB | Viewed 2806 times ]
GreenfaceRBO.jpg
GreenfaceRBO.jpg [ 78.52 KiB | Viewed 2793 times ]
rainbowOctRot.jpg
rainbowOctRot.jpg [ 62.89 KiB | Viewed 2847 times ]
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 Post subject:
PostPosted: Wed Jan 16, 2008 5:56 pm 
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Joined: Mon Oct 22, 2001 12:45 pm
Lee,

Thank you very much for making this design and also for sharing it with us.
The puzzle is now turned into a real ‘playable’ puzzle and I am looking forward to having some pieces made and to actually try the puzzle.

The end pieces have a very peculiar shape which perhaps is less visible from the picture compared to the stl-file.
Using your stl-file I made some 2d pictures to show this shape.

It looks somewhat like a piece of art.

Thanks a lot!!!

Geert

Image


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 Post subject:
PostPosted: Wed Jan 16, 2008 9:30 pm 
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Since it's just the end piece, perhaps he could try adapting it to my idea/concept.

Instead of having non functional extensions into the octahedron shape, why don't you make them functional.

For example, the Rainbow Cube with non functional extensions into a cube is a Dino Cube, but make those functional, and you have a Lattice cube.

Going even further (Although I think this would be too difficult) but adding functional extensions in both directions, a cube and an octahedron. It would be insanely fragile and difficult to make, but it would yield a fantastic and beautiful puzzle.

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3x3 PB 22.63
3x3 Av 30.57

25, Male
Started cubing Oct 15 '05

Out of the game, but not completely.


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 Post subject: Re: Rainbow Octahedron
PostPosted: Sat Apr 05, 2008 5:09 am 
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Using the stl-file of the end-piece designed by Lee, I made some rapid prototyping parts.
These (white) parts were coloured and glued onto a rainbow cube.
Thomas provided me with professional stickers (thanks a lot!!) and the puzzle is now complete.
Due to the end-pieces, all initial problems regarding alignment etc have now been solved.

Geert


Attachments:
RO extended part 1.jpg
RO extended part 1.jpg [ 68 KiB | Viewed 2647 times ]
RO extended part 2.jpg
RO extended part 2.jpg [ 15.08 KiB | Viewed 3820 times ]
RO Stickers.jpg
RO Stickers.jpg [ 25.21 KiB | Viewed 3811 times ]
Rainbow Octahedron 1.jpg
Rainbow Octahedron 1.jpg [ 17.91 KiB | Viewed 3819 times ]
Rainbow Octahedron 2.jpg
Rainbow Octahedron 2.jpg [ 17.21 KiB | Viewed 3815 times ]
Rainbow Octahedron 3.jpg
Rainbow Octahedron 3.jpg [ 16.01 KiB | Viewed 3808 times ]
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 Post subject: Re: Rainbow Octahedron
PostPosted: Sat Apr 05, 2008 7:18 am 
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It looks great! Are there any plans for mass production?

:)


Pantazis

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 Post subject: Re: Rainbow Octahedron
PostPosted: Sat Apr 05, 2008 8:14 am 
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Looks amazing, a really professional job done here


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 Post subject: Re: Rainbow Octahedron
PostPosted: Sat Apr 05, 2008 12:33 pm 
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Joined: Mon Oct 22, 2001 12:45 pm
Quote:
Are there any plans for mass production?

I hope that I will be able to make a couple of more sets.
However, since 24 (end-)pieces are required per puzzle, I will probably only be able to make a few more sets.
Moreover, there are two other 'projects' ahead of this.

Geert


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