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 Post subject: Test pieces for a new(ish) 3x3 mechanism
PostPosted: Mon Oct 05, 2009 5:41 pm 
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Update: I've received the test pieces for the puzzle. It will be the same size as a normal 3x3 cube, and needs only a few minor modifications. Scroll down to the bottom of the thread for pictures.

Original post:

Well, this year's science fair is coming soon, and I decided that I was going to have to do my project on something involving the Rubik's cube, in some way. So, I've been drawing up ideas for a while. Everything from designing my own puzzle to my own method for some kind of puzzle, or both. Finally, I settled on an idea that would integrate science (mathematics) and engineering, basically by demonstrating a mechanism for a coreless 3x3 very similar to the one in this thread:

http://www.twistypuzzles.com/forum/viewtopic.php?t=6187

Similar to the 5x5 on the screen, only as a 3x3. Also, when I thought it up, I thought the rails should be the opposite way, with all notches on the corner pieces and all rails on the centers.

Unfortunately, I don't have the funds to cast it, and I'm not sure how to demonstrate it. So, a few questions:

1. Would this be a good idea?

2. If I were to have this 3d printed to the size of a 3x3 cube, roughly how much would it cost? (just in case I could afford it)

3. Would it even be possible to assemble?

Also, I'd like to ask wwwmwww if it's okay that I'm trying to do a project on this. Please note that I didn't see your mechanism and then decide to copy it, but rather thought the whole thing up on my own, then looked at your thread and realized that it may be a good idea after all.

_________________
~Kapusta

PB: At home (In Competition)
2x2 1.xx (2.88)
3x3 11.xx (15.81)
4x4 1:18.26 (1:24.63)
5x5 (3:00.02)
6x6 4:26.05 (6:34.68)
7x7 6:38.74 (9:48.81)
OH (35.63)

Current Goals:
7x7 sub 6:30
4x4 sub 1:10


Last edited by Kapusta on Mon Dec 28, 2009 8:52 pm, edited 1 time in total.

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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Tue Oct 06, 2009 1:06 pm 
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It sounds like a good idea. I think your tolerances are going to have to be extremely tight. Not sure on cost to get it printed. To assemble it, you may have to do some sort of partial piece for the last one that somehow snaps in place or something.

-d


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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Tue Oct 06, 2009 2:35 pm 
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I guess you could assemble it by splitting the 'centers' in half and uniting the pieces using a screw after assembling.

If you play it smart (make it nicely hollow) I think it will cost under $200 to print at ShapeWays.

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Buy my mass produced puzzles at Mefferts:
- 4x4x6 Cuboid for just $38
- Curvy Copter for just $18
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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Tue Oct 06, 2009 8:48 pm 
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Kapusta wrote:
Also, I'd like to ask wwwmwww if it's okay that I'm trying to do a project on this. Please note that I didn't see your mechanism and then decide to copy it, but rather thought the whole thing up on my own, then looked at your thread and realized that it may be a good idea after all.
No objection here. I'd love to see this idea put to practice.

Carl

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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Thu Oct 08, 2009 7:08 pm 
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Location: USA, North America, Planet Earth, Solar system, Milky Way galaxy, Universe
Kapusta wrote:
Well, this year's science fair is coming soon, and I decided that I was going to have to do my project on something involving the Rubik's cube, in some way. So, I've been drawing up ideas for a while. Everything from designing my own puzzle to my own method for some kind of puzzle, or both. Finally, I settled on an idea that would integrate science (mathematics) and engineering, basically by demonstrating a mechanism for a coreless 3x3 very similar to the one in this thread:

http://www.twistypuzzles.com/forum/viewtopic.php?t=6187

Similar to the 5x5 on the screen, only as a 3x3. Also, when I thought it up, I thought the rails should be the opposite way, with all notches on the corner pieces and all rails on the centers.

Unfortunately, I don't have the funds to cast it, and I'm not sure how to demonstrate it. So, a few questions:

1. Would this be a good idea?

2. If I were to have this 3d printed to the size of a 3x3 cube, roughly how much would it cost? (just in case I could afford it)

3. Would it even be possible to assemble?

Also, I'd like to ask wwwmwww if it's okay that I'm trying to do a project on this. Please note that I didn't see your mechanism and then decide to copy it, but rather thought the whole thing up on my own, then looked at your thread and realized that it may be a good idea after all.

Don't need any 3-d printing for this one. Just add cubies into the centers of a void cube.

_________________
-sj

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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Thu Oct 08, 2009 7:15 pm 
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Monopoly wrote:
Kapusta wrote:
Well, this year's science fair is coming soon, and I decided that I was going to have to do my project on something involving the Rubik's cube, in some way. So, I've been drawing up ideas for a while. Everything from designing my own puzzle to my own method for some kind of puzzle, or both. Finally, I settled on an idea that would integrate science (mathematics) and engineering, basically by demonstrating a mechanism for a coreless 3x3 very similar to the one in this thread:

http://www.twistypuzzles.com/forum/viewtopic.php?t=6187

Similar to the 5x5 on the screen, only as a 3x3. Also, when I thought it up, I thought the rails should be the opposite way, with all notches on the corner pieces and all rails on the centers.

Unfortunately, I don't have the funds to cast it, and I'm not sure how to demonstrate it. So, a few questions:

1. Would this be a good idea?

2. If I were to have this 3d printed to the size of a 3x3 cube, roughly how much would it cost? (just in case I could afford it)

3. Would it even be possible to assemble?

Also, I'd like to ask wwwmwww if it's okay that I'm trying to do a project on this. Please note that I didn't see your mechanism and then decide to copy it, but rather thought the whole thing up on my own, then looked at your thread and realized that it may be a good idea after all.

Don't need any 3-d printing for this one. Just add cubies into the centers of a void cube.


There would still be the core technically though, would there? The inside pieces that hold it together are considered the core. On the one he was talking about the pieces like the edges and corners are parts that connect together, instead of having extra pieces for the core.

_________________
3x3: 37.52(Lucky)
2x2: 9.51(Lucky)
Megaminx: 3:57.61
Super Square-1: 2 days
Fisher cube: 52.17
3x3x4: 2:34.68 (no parity)

Kevin


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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Fri Oct 09, 2009 6:21 pm 
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Monopoly wrote:
Don't need any 3-d printing for this one. Just add cubies into the centers of a void cube.


Not much of a Science project... :P

Besides, I'm pretty sure the two mechanisms are completely different.

_________________
~Kapusta

PB: At home (In Competition)
2x2 1.xx (2.88)
3x3 11.xx (15.81)
4x4 1:18.26 (1:24.63)
5x5 (3:00.02)
6x6 4:26.05 (6:34.68)
7x7 6:38.74 (9:48.81)
OH (35.63)

Current Goals:
7x7 sub 6:30
4x4 sub 1:10


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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Mon Oct 12, 2009 5:44 pm 
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First off, thank you all for your comments. :)

Alright then, I've got until the end of January to do something involving this idea. To satisfy both my needs and the needs of the Science Fair judges, I'll be making a project that either:

1. Displays the mechanism by use of handmade models/ computer rendered animations, possibly with a few pieces that could show what the final puzzle's pieces would be like, but nothing fancy or accurate. Then, later on, I could print up the files as a prototype. With the way it looks now, this could very well be what it looks like, as if I played it safe, there'd be virtually no way for it to cost more than, say, $20.

Or, I could:

2. Actually build the puzzle between now and January, while still showing the step-by-step process used to create it. If it turned out well, this could be a very good project, but if I made just one small mistake, it could be a disaster. Printing will cost a LOT, compared to what I'll probably have to work with, so I don't think I'll want to be printing 2 or 3 prototypes before finding a good one between now and January.

Either way you look at it, I'll need a suitable CAD tool to use. What free CAD software would you recommend for a Mac G5, running OS X 10.5? (Note: The reason I don't have a CAD software yet is because I run OS X 10.3.9 on an old Mac G4, but my dad will be getting a new Intel Mac soon, so I'll get the G5.)

Also, although I'd love to use something like Solidworks, I'm not sure if I'd want to take any trial offers, because if I make any mistakes and want to fix it after 90 days, I'll have to rebuild the whole thing on another software.

Thanks in advance! :)

EDIT: Can anyone tell me how Flexible the Shapeways Strong White Flexible material is? Is it, like, a soft plastic, or more of a rubber? And is the setup cost on the White Flexible Material an additional $1.50 per cm^3, meaning that every cm^3 would cost $3.00?

_________________
~Kapusta

PB: At home (In Competition)
2x2 1.xx (2.88)
3x3 11.xx (15.81)
4x4 1:18.26 (1:24.63)
5x5 (3:00.02)
6x6 4:26.05 (6:34.68)
7x7 6:38.74 (9:48.81)
OH (35.63)

Current Goals:
7x7 sub 6:30
4x4 sub 1:10


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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Sun Oct 25, 2009 3:52 pm 
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Sorry that this post is only a bump (and a triple post, for that matter), but I need some replies, and this thread is pretty much dead...

_________________
~Kapusta

PB: At home (In Competition)
2x2 1.xx (2.88)
3x3 11.xx (15.81)
4x4 1:18.26 (1:24.63)
5x5 (3:00.02)
6x6 4:26.05 (6:34.68)
7x7 6:38.74 (9:48.81)
OH (35.63)

Current Goals:
7x7 sub 6:30
4x4 sub 1:10


Top
 Profile  
 
 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Sun Oct 25, 2009 4:07 pm 
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WSF costs $1.5 per CM plus an additional $1.5 per model. So that's 1.5*(volume+1). It's pretty though. It's flexible in the sense that like a plastic coffee stirrer, it will bend before it breaks. But if it's in the shape of a cube, it won't really bend at all due to the geometry.

I think a real model would be cooler, I think some people might have difficulty imagining it work. Maybe you could even make it like Oskar's hollow cube.

_________________
Tom's Shapeways Puzzle Shop - your order from my shop includes free stickers!
Tom's Puzzle Website


Buy my mass produced puzzles at Mefferts:
- 4x4x6 Cuboid for just $38
- Curvy Copter for just $18
- 3x4x5 Cuboid for just $34


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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Mon Oct 26, 2009 4:31 pm 
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Ah, now the extra $1.50 makes sense.

The main problem with making anything like the hollow cube is that this is a fragile, unprototyped mechanism as it is. I don't know if I'd want to add to the fragility by hollowing out all the pieces, though I suppose I could design it with very thin walls to the pieces, and hollow out the inside.

Again, the entire project is still up in the air. I'm not sure how I'll go about presenting the model idea, but I'm glad that I now know that 3d printing could be an option. When I design it, I'll have to get a Shapeways quote.

Also, has anyone used the free Mac beta of Rhino 3d? How well does it run?

_________________
~Kapusta

PB: At home (In Competition)
2x2 1.xx (2.88)
3x3 11.xx (15.81)
4x4 1:18.26 (1:24.63)
5x5 (3:00.02)
6x6 4:26.05 (6:34.68)
7x7 6:38.74 (9:48.81)
OH (35.63)

Current Goals:
7x7 sub 6:30
4x4 sub 1:10


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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Tue Oct 27, 2009 1:14 am 
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The WSF material does not mind being hollow. It is incredibly strong.

You don't need to upload a design to Shapeways for a quote. You can just do that by measuring the volume of the model and doing some math.

_________________
Tom's Shapeways Puzzle Shop - your order from my shop includes free stickers!
Tom's Puzzle Website


Buy my mass produced puzzles at Mefferts:
- 4x4x6 Cuboid for just $38
- Curvy Copter for just $18
- 3x4x5 Cuboid for just $34


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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Sat Oct 31, 2009 2:18 pm 
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I've just been accepted for my application for Rhino 3d for Mac, and downloaded it. I have a $100 budget for printing the puzzle, so I'll need to make it nice and hollow.

A few Rhino related questions:

How do I know what unit of measurement I'm working in? This question was always bothering me, and now that I'll have to print it, I don't know how to tell how big something is in real life.

Another important thing: can Rhino files on the mac be converted into STLs? DO you need a plugin for that, or can you simply upload the standard Rhino files?

I was also thinking about how to assemble the puzzle. Should I make one of the edge pieces in 2 halves? Or, better yet, build the entire puzzle in 2 interlocking halves?

_________________
~Kapusta

PB: At home (In Competition)
2x2 1.xx (2.88)
3x3 11.xx (15.81)
4x4 1:18.26 (1:24.63)
5x5 (3:00.02)
6x6 4:26.05 (6:34.68)
7x7 6:38.74 (9:48.81)
OH (35.63)

Current Goals:
7x7 sub 6:30
4x4 sub 1:10


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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Sat Oct 31, 2009 2:36 pm 
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It is not important what unit Rhino is using, as STL files do not define units anyways. When submitting an STL for printing you're always asked what unit it is in. Shapeways gives you the choice of meters, millimetres and inches.
So if you were to pick millimetres when uploading, that would mean that 1 Rhino unit would translate to 1 mm, even if Rhino thinks it's a meter or inch.

I would recommend that you just pick 1 unit = 1mm, it appears to be pretty much 'standard'.

_________________
Tom's Shapeways Puzzle Shop - your order from my shop includes free stickers!
Tom's Puzzle Website


Buy my mass produced puzzles at Mefferts:
- 4x4x6 Cuboid for just $38
- Curvy Copter for just $18
- 3x4x5 Cuboid for just $34


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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Tue Nov 03, 2009 12:52 pm 
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Thanks, TomZ :D

After a few days of figuring out some of the Rhino basics, I managed to design the center piece. It is hollow with 2 mm walls, made in 2 interlocking parts so that assembly will actually be possible, and should cost about $3 for both halves. THe problem is, I have no idea how to start filleting the pieces in Rhino. Any tips on how to get a 1mm fillet all around a cube in rhino?

_________________
~Kapusta

PB: At home (In Competition)
2x2 1.xx (2.88)
3x3 11.xx (15.81)
4x4 1:18.26 (1:24.63)
5x5 (3:00.02)
6x6 4:26.05 (6:34.68)
7x7 6:38.74 (9:48.81)
OH (35.63)

Current Goals:
7x7 sub 6:30
4x4 sub 1:10


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 Post subject: Re: Rubik's Cube Sciene Fair Project
PostPosted: Thu Nov 05, 2009 11:26 am 
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Update, I fine tuned the centers a bit, most of which was cosmetic/filleting.

Attachment:
File comment: The two pieces will interlock during the puzzle's assembly, so that it won't be impossible to put together.
Centerpiece2.jpg
Centerpiece2.jpg [ 16.52 KiB | Viewed 3080 times ]


Now, I'll be beginning the corner. How much larger should I make the gap in the corner (where the rail from this piece/the edge fits into) so that there will be good tolerance?

_________________
~Kapusta

PB: At home (In Competition)
2x2 1.xx (2.88)
3x3 11.xx (15.81)
4x4 1:18.26 (1:24.63)
5x5 (3:00.02)
6x6 4:26.05 (6:34.68)
7x7 6:38.74 (9:48.81)
OH (35.63)

Current Goals:
7x7 sub 6:30
4x4 sub 1:10


Top
 Profile  
 
 Post subject: Re: Test pieces for a new(ish) 3x3 mechanism
PostPosted: Mon Dec 28, 2009 8:59 pm 
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Well, I'm long overdue for an update on this, but now it will be a bit more interesting. I've received the test pieces for the 3x3, and turning is... getting there. I need to address a small issue with the center pieces, and then I should be good to go.

Attachment:
Photo 3.jpg
Photo 3.jpg [ 30.58 KiB | Viewed 2832 times ]


Attachment:
Photo 4.jpg
Photo 4.jpg [ 28.26 KiB | Viewed 2832 times ]


Attachment:
Photo 5.jpg
Photo 5.jpg [ 34.71 KiB | Viewed 2832 times ]


Attachment:
Photo 6.jpg
Photo 6.jpg [ 36.79 KiB | Viewed 2832 times ]


Attachment:
Photo 7.jpg
Photo 7.jpg [ 36.66 KiB | Viewed 2832 times ]


The only problem with the turning is that the corners and centers are too tight when you put them together. To be continued...

Also, anyone know what the best place is to get black dye for SLS?

_________________
~Kapusta

PB: At home (In Competition)
2x2 1.xx (2.88)
3x3 11.xx (15.81)
4x4 1:18.26 (1:24.63)
5x5 (3:00.02)
6x6 4:26.05 (6:34.68)
7x7 6:38.74 (9:48.81)
OH (35.63)

Current Goals:
7x7 sub 6:30
4x4 sub 1:10


Top
 Profile  
 
 Post subject: Re: Test pieces for a new(ish) 3x3 mechanism
PostPosted: Mon Dec 28, 2009 9:09 pm 
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I think RIT dye works, and I know you should be able to get that at a walmart or similar.

Also, it looks nice! The biggest issue with it will be alignment, no cutting corners on this!

_________________
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"Study gravitation, it's a field with a lot of potential."
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 Post subject: Re: Test pieces for a new(ish) 3x3 mechanism
PostPosted: Fri Jan 01, 2010 4:09 pm 
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I went out today to a craft store and got some black Rit dye to test on these pieces. should I be using it right out of the bottle, at full strength on the pieces, or should I dilute it?

Also, the problem with the puzzle's turning is that the rails are too short. should I extend them by half a millimeter, or a full millimeter?

_________________
~Kapusta

PB: At home (In Competition)
2x2 1.xx (2.88)
3x3 11.xx (15.81)
4x4 1:18.26 (1:24.63)
5x5 (3:00.02)
6x6 4:26.05 (6:34.68)
7x7 6:38.74 (9:48.81)
OH (35.63)

Current Goals:
7x7 sub 6:30
4x4 sub 1:10


Top
 Profile  
 
 Post subject: Re: Test pieces for a new(ish) 3x3 mechanism
PostPosted: Fri Jan 01, 2010 4:27 pm 
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coming together very nicely, i hope to see a video soon

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