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 Post subject: Why hasn't a face turning rhombic dodecahedron been producedPosted: Fri May 25, 2012 9:39 am

Joined: Mon Jun 06, 2011 6:35 am
why wasn´t been mass produced a face turning rombic dodecahedron yet?

It seems to be a simple mechanism.

I would love to have one like the Toru or Rua.

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 Post subject: Re: why wasn´t been mass produced?Posted: Fri May 25, 2012 10:06 am

Joined: Sun Mar 27, 2005 7:37 pm
sedna wrote:
why wasn´t been mass produced a face turning rombic dodecahedron yet

Google should have given you- "Why hasn't a face turning rhombic dodecahedron been produced yet?"

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 Post subject: Re: Why hasn't a face turning rhombic dodecahedron been prodPosted: Fri May 25, 2012 10:35 am

Joined: Mon Jun 06, 2011 6:35 am
Sorry for my bad English..

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 Post subject: Re: Why hasn't a face turning rhombic dodecahedron been prodPosted: Fri May 25, 2012 10:38 am

Joined: Sun Apr 16, 2000 3:17 pm
Location: Hong Kong
Not necessarily an English problem. It's more of a title problem. No worries. It's been fixed.

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 Post subject: Re: Why hasn't a face turning rhombic dodecahedron been prodPosted: Fri May 25, 2012 1:48 pm

Joined: Thu Dec 31, 2009 8:54 pm
Location: Bay Area, California
My best guess for why the FTRD hasn't been mass produced is that it's hard to get turning well.

Here is a picture of Eitan's FTRD:
Attachment:

eitan_ftrd.png [ 183.1 KiB | Viewed 1073 times ]

This puzzle is 100% equivalent to TomZ's Curvy Copter II.

The issue is that in the Rhombic Dodecahedron version of the puzzle the corners with the 4-fold symmetry tend to be quite loose and easy to rotate in place. Mid-turn they tend to sag and catch. Furthermore, the 4 triangles around those corners have a somewhat awkward mechanism on them and are a bit loose and contribute to catching too.

When the puzzle is a cube like the CC II the trouble pieces are the center squares and they are surrounded by other pieces and not hanging out on the edge of the puzzle like they are in the FTRD form. These aren't insurmountable problems but they do add to the difficulty of making a really good turning puzzle.

Also, the Rua is deeper cut than the CC II / FTRD which hides the 24 helicopter cube triangles and the edge centers. They aren't gone though, they are just on the inside of the puzzle. This would be roughly equivalent to a Pyraminx Crystal in that there is a hidden inner shell.

The Toru is much deeper cut than either and has a lot of hidden pieces. It would be similar to a Starminx in terms of hidden pieces.

I think the complexity of having hidden pieces combined with the somewhat catching / unstable rhombic dodecahedron shape combine to make a puzzle that isn't an ideal candidate for mass production.

Of course it certainly could happen. MF8 is bringing out Eitan's DeFTI and they did release a Starminx so we know it can be done. I'm not holding my breath for an FTRD though.

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 Post subject: Re: Why hasn't a face turning rhombic dodecahedron been prodPosted: Fri May 25, 2012 2:33 pm

Joined: Sun May 06, 2012 11:35 am
Would this same problem of pieces catching happen if you were to make a rhombic dodecahedron out of a helicopter cube? (I haven't found one of these in the museum, though I may have missed something)

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