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 Post subject: Burning question: Icosahedral starminx III????
PostPosted: Sun Jul 07, 2013 10:49 am 
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What would it look like? I've been thinking about this for some time, and the closest I could find is Jason's radio star (EDIT: not the radio star, the radio crystal, which works well), which failed. What would an icosahedral starminx III look like?

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 Post subject: Re: Burning question: Icosahedral starminx III????
PostPosted: Tue Jul 09, 2013 11:03 am 
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Hopefully you can see from the following images what it would look like :)

Attachment:
File comment: Starminx III Dodeca
StarminxIIIDodeca.png
StarminxIIIDodeca.png [ 20.47 KiB | Viewed 1277 times ]


Attachment:
File comment: Starminx III Icosa/Dodeca
StarminxIIIIcosaDodeca.png
StarminxIIIIcosaDodeca.png [ 30.26 KiB | Viewed 1277 times ]


Attachment:
File comment: Starminx III Icosa
StarminxIIIIcosa.png
StarminxIIIIcosa.png [ 26.12 KiB | Viewed 1277 times ]


-Mark- :)

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 Post subject: Re: Burning question: Icosahedral starminx III????
PostPosted: Tue Jul 09, 2013 2:48 pm 
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If that is correct, I would love to see someone sticker it :lol:

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 Post subject: Re: Burning question: Icosahedral starminx III????
PostPosted: Wed Jul 10, 2013 1:10 am 
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That is a lot of pieces moving around!!! :shock:

Gus wrote:
If that is correct, I would love to see someone sticker it :lol:
I'll sticker it, now who is going to make it? :mrgreen:

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 Post subject: Re: Burning question: Icosahedral starminx III????
PostPosted: Wed Jul 10, 2013 2:13 am 
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Pete the Geek wrote:
I'll sticker it, now who is going to make it? :mrgreen:


Ah, I just realized, it HAS been made. It is Jason's Radio Jam but with different proportions on the faces.

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 Post subject: Re: Burning question: Icosahedral starminx III????
PostPosted: Thu Jul 11, 2013 2:48 am 
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Hey!

When the corners disappear on a dodecahedron, the face centers disappear on an icosahedron. So you were right when you said this would be the Radio Crystal, which works quite well!
http://twistypuzzles.com/forum/viewtopi ... 15&t=24800

The moment when the corners on a face turning icosahedron disappear would be the Radio Star, which has failed in my first attempts. But that would be the real Starminx of icosahedrons. Truth be told, I have been working on the new Radio Star for three months.

It's very very hard...

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 Post subject: Re: Burning question: Icosahedral starminx III????
PostPosted: Thu Jul 11, 2013 4:02 am 
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Is it hard because of the proportions of the mechanism, or just the mechanism itself is hard to design?

Because I think you can use the same mech from the Radio Nova puzzle, just pull the exiting cut deeper.

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 Post subject: Re: Burning question: Icosahedral starminx III????
PostPosted: Thu Jul 11, 2013 6:43 pm 
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rubikcollector123 wrote:
Because I think you can use the same mech from the Radio Nova puzzle, just pull the exiting cut deeper.
There is no such thing as "just pulling a cut deeper." 8-) Anytime you go deeper, and you cut new pieces off, the mechanism has to gain some shells. Keeping up with this is never a simple matter.

-Eitan

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 Post subject: Re: Burning question: Icosahedral starminx III????
PostPosted: Thu Jul 11, 2013 8:48 pm 
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pirsquared wrote:
There is no such thing as "just pulling a cut deeper." 8-) Anytime you go deeper, and you cut new pieces off, the mechanism has to gain some shells. Keeping up with this is never a simple matter.

-Eitan


But wait, lets say you had mf8's curvy starminx designed. You could just turn it into a starminx by deepening the cuts right?

Similarly for the Radio Star, you could just pull the cut deeper to hide off the corners. No new pieces are produced.

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 Post subject: Re: Burning question: Icosahedral starminx III????
PostPosted: Thu Jul 11, 2013 9:17 pm 
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Ah! I see what you mean, now. Well I think the issue Jason is running into is that when you cut something so deeply, it's always iffy how the pieces are going to interact. For example, on my disastrous Big Kahuna, some pieces were so small that they simply wouldn't stay in place. In theory it should have worked, but the turning groups were so wide that the central screws couldn't hold all the parts down. Some geometries and cut depths are seriously evil.

-Eitan

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 Post subject: Re: Burning question: Icosahedral starminx III????
PostPosted: Fri Jul 12, 2013 12:28 pm 
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Yes, Eitan's right. When the cuts get deeper, things can get ugly. Even if parts are only disappearing. The Radio star loses the corners on the outside (like a Starminx). This ends up creating very loose corners where 5 faces meet at fairly acute angles. They just want to fall out due to the angles they meet at and filleting.

My current approach is similar to my Radiolarian 2, which had a deeper Radiolarian 3 on the inside. The new Radio Star goes to a deeper more stable puzzle, and then backs up the cuts on the outside. I'm agonizing over the design a bit, because it has to be so much larger to make this approach work. We'll see if it works better.

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 Post subject: Re: Burning question: Icosahedral starminx III????
PostPosted: Mon Jul 15, 2013 10:34 am 
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pirsquared wrote:
Ah! I see what you mean, now. Well I think the issue Jason is running into is that when you cut something so deeply, it's always iffy how the pieces are going to interact. For example, on my disastrous Big Kahuna, some pieces were so small that they simply wouldn't stay in place. In theory it should have worked, but the turning groups were so wide that the central screws couldn't hold all the parts down. Some geometries and cut depths are seriously evil.

-Eitan


This is exactly what I'm worried about on the puzzle I'm working on: viewtopic.php?f=9&t=25774

Did you ever find a way around it? I added an additional "wedge"/"grip" - what ever you want to call it on the outermost shell in hopes that this will keep things from falling out:

Attachment:
grip.jpg
grip.jpg [ 12.84 KiB | Viewed 858 times ]


I also considered making the grip go inward instead of the outward direction. Still not sure it will make a difference.

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