Why don't Rubik's cubes fall apart?
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- Опубликовано: 2 окт 2024
- Explaining (one version of) the mechanism inside a Rubik's cube.
It would be far cheaper to just buy a Rubik's cube and disassemble it, but in case you want to buy one of these 3D printed mechanisms, you can get the parts here:
Faces and core: shpws.me/T4WN
Edges: shpws.me/T4WQ
Corners: shpws.me/T4WR
You can also download the files from www.printables... and print the parts on your own printer.
A Rubik's cube doesn't fall apart because it emotionally steeled itself after a lifetime of heartbreak.
Lmao
Am I a Rubik's cube?
I think you are talknig about the crazy users of Rubic Cubes.
@@urrywestah, I think he's projecting and I can totally relate
LMAO
i would never have thought that all the parts simply suspend each other without being fixed at any point other than the faces, fascinating mechanism
What do you mean by being fixed at the faces??
@@leif1075 face pieces, or "the middle piece in each face" is probably what he meant
I've known since I was a kid cause I've put them back together before
@@ccscheller8193
Same
@@leif1075 The "middle" pieces on each side, those always stay in the same place, everything else is built like a sliding door where it's not actually attached to anything but rather it's wedged in so it can slide freely but with restricted movement but not actually attached to anything...
The crazy part about this is that Erno Rubik figured all this out in the 70's, without any CAD, and without 3d printers. It's a brilliant mechanism and the same general principle applies to just about all twisty puzzles sold today.
Here, take an ő.
That's because it's not nearly as painful as this guy makes it seem lol
It's pretty straightforward if you just look at a "disassembled cube". I don't know what all this bullshit is for. It didn't "clarify" anything whatsoever
@@MadScientist267 woah I never thought about it that way. Whenever I want to invent something I can just look at the disassembled version of that invention that hasn’t been invented yet.
@@JackLe1127 Actually that's exactly how it works lol 🙄🤦♂️🤷♂️
It's not actually that crazy. It's having a goal and designing prototypes until you've achieved it. You can make this with wood, or plastic that you can manually mold by heating it. And some screws. Once you have the basic mechanism down you can refine it into a usable product. Someone could've made this in the 1600s, let alone the 1970s. The pendulum clock is nearly 400 years old for example. Don't underestimate humanity's ability to make shit with "primitive" tools.
Very good explanation. All rubik's-like twisty puzzles have very fascinating mechanisms, all utilizing similar design methods.
For example the 8x8 Vcube contains a tiny "bandaged" 3x3, and all the edges are rounded. It's corners then extend through the entire cube to the surface, and form maybe 5 different layers. All of the external pieces have long, thin, and very zig-zag-y shapes, to properly lock together and hold.
The whole thing has over 300 separate pieces, and is held together by only 3 screws. It's amazing
Now make my rubik’s snake as indestructible.
Assembling my 7x7x7 is almost as much of a challenge as solving it.
There is a lot of ingenuity in the way regular rubik's cubes are made, but there is also a lot of ingenuity in the way you designed yours to make it clearly understandable and visually elegant. Congratulation !
Waste of time 🙄
Doesn't fall apart? Clearly you haven't seen me get frustrated with trying to remember how to fix a parity error on a 4x4 and give up on solving it legitimately, instead trying to pry the two corners in question out so I can put them back in their places directly, but then once I've taken them out I momentarily lose my grip on the rest of the cube and it falls and comes apart, spreading pieces loudly scattering all over the floor of my 7th grade geometry class 😎
it's just two algorithms
@@luckythelucklesswolf1419 I backward engineered both kinds of parity to not have to learn the parity algorithms. I can solve 4x4 with redux, w/o the standard parity algorithms.
@@cat7294 ah, cool, I feel like that's much more effort than just learning the parity algorithms, but you do you
I always just peeled the stickers off the cube and put them back on where they needed to be...
You guys are SOLVING them?
Before this video I could've told you how to solve Rubik's cube but never actually how they worked. Always wondered. Great video!
Surprising that you have never disassembled one :)
@@ZenoRogue It's not that they didn't disassemble one, it's the fact that they didn't think about how the mechanism works.
This is a good video because:
- It goes straight to the facts. No stupid intros, no stupid music with caveman rhythm.
- Good content and just content.
- Very well explained, clear voice, easy to understand.
- No improvised material, so it lacks of "uhhh..." , "Ahem... ", "errr..."
Thank you Mr. Segerman.
Really awkward explanation and why not show an original rubik's cube? Ugh. Good, but here's some feedback for you Mr. Segerman.
@@victoriapollard6995 You could go do a video of that yourself as you think it's so straightforward eh?
@@BN1960 Suppose so.
@@BN1960 Although, I think making videos like this are more difficult than you are giving credit for. Just something for you to think about before you post again.
I am hungarian (The place were the Rubik's cube came from 🇭🇺) and i learned little about Rubik Ernő and his toys. Actually he mae many many other fidgets and logic toys. You explained the mechanism very well. Thank you.
You solved the cube quick!
All the faces are white and green again!
good explanation! Nice to see that you have Rubik's Cubes :D
Only for demonstration purposes! I've never spent the time to learn how to solve one.
@@henryseg Why do you assume it is spherical on inside.I know you said it was for simplification purposes but how does it simplify things?.I wouldn't think the rubies cube mechanism is actually spherical is it? Hope you can respond when you can
@@henryseg And what the heck are the cubies you refer to at 1:39?? That correspond to faces and edges..huh?
@@leif1075 The actual mechanism on the Rubik's Cube looks a little different but it still has spherical elements and fundamentally operates the exact same way.
@@leif1075 It's corners and edge pieces. Edge pieces are the pieces that are held only by the centers of the cube, and corners are the pieces only held by the edge pieces.
It's fun to look at how large versions work, like 11x11x11 and up. My son has one.
Individual cubies do fall out sometimes when spun too vigorously. I get to figure out how to poke their jagged appendages back into their orbits.
Your introduction: in my language we call them "magic cubes"
I remember pulling a rubik’s cube apart when I was around 8 just trying to figure out how it works
The craziest thing I found out is that the 2x2 Rubik's Cube, is that it's basically a 3X3 Rubik's Cube but with the corners made so big that they cover the edge and face pieces. Similarly, a 4x4 cube is just basically the same as a 2x2 but each corner is broken into 4 parts that all have grooves to move around each other.
a 2x2 is really different
your method would be expensive and inefficient
it was my first thought too though
They're right tho. A 2x2 is a 3x3 with hidden edges. A 4x4 is a 5x5 with some of the centers hidden. Every even layered cube is the same as the cube with an extra layer but with hidden pieces.
@@sumynona.01 No, 2x2's really are just 3x3's with the center hidden. If you have a 2x2 yourself, you can see this by disassembling it. Most 2x2 cubes have a visible screw in the very center of at least 1 of their faces - you can use that screw to disassemble your cube. One you take the cube apart, you will notice the the "core" (the central lattice that is used to keep the pieces together) looks identical to the core of a 3x3.
However, 3x3's have their center piece caps placed directly on top of the stalks of the core, whereas the 2x2 hides the stalks underneath the corner pieces.
As a cost saving measure (and also to improve cube stability), some 2x2's also integrate one of the corners into the core, but the basic structure of the cube is still a 3x3, just with 1 corner of the 3x3 unable to move.
@@Ruminations09 ok
wait
*wait*
search '*jared owen 2x2*
he shows the mechanism i was talking about
@@sumynona.01 that is an exception, no competetion viable cubes use this mechanism
Here's a video taking a look at the mechanism and inner workings of a 21x21x21 cube (yes, actually that big): ruclips.net/video/C4UDB_Y_Lrs/видео.html
On the original cubes you could rotate a side until the corner piece was pointing up then twist the corner piece and pull it out. once that was done the whole thing could be easily disassembled. only the six center pieces were attached, the rest were individual pieces that locked together. I solved it my way, pull it apart and put it back together right.
Whoever asks that question has never pushed speed cubing far enough.
Why you don't have as many subscribers as there are possible permissions of the 3x3 cube, I do not know.
I blame the Al Gore Rhythm...
Incredible workmanship 😮 Wow.
It doesn't fall apart because it hasn't met Henya yet.
Good description of the maths.
I can't even watch you turn the Rubik's cube without cringing. I speed cube as a hobby and the difference between the original Rubik's mechanism and the mechanism used by speed cubes is so disparate. You said this is one of the simplest variance but the speed cube variance generally are simpler because they don't have a ballcore. Instead, they are literally just six posts the sticking out, each one being the center and then the pieces just slot into them. Also, unlike the original Rubik's cube you can make a turn without having to fully align every single layer. There's also a spring or magnets inside of each of the centerpieces to allow them to have wiggle room. It makes sense that Rubik's would keep their old mechanism because it does hold the cube together better than the speed cube versions, and obviously if the toy breaks then kids will get upset even if you can easily reassemble it.
Instant sub. Other RUclipsrs should be taking notes. No intro, no bull, no plug, no e-begging. Straight to the point, informative, thought-provoking.
Ten.
Plug good
Make money
I added some STL files to make it easier for people with FDM printer to print this model. Anyone interested can find these files linked from the original Printables page. A link to the Printables page is provided in the description.
Because they're held together by faith?
👼🏻
this rubik's cube is so yesteryear
The void cube blew my mind. Looks like a normal cube but has no central axes, just air.
i have a 17 pb but this is still interesting
[Insert rubik's brand roast here]
As a cuber, this mostly feels obvious for some reason. Also, the intersecting planes don't have to be the same distance from the center of the sphere. Just search up "mirror blocks" on youtube.
wow that is sooo cool!
A braided gears video would be interesting. Looks so fascinating! And thanks for making this video! Thoroughly enjoyed. 😁
Already made that video! Although I’ve got a couple of new variants that I could talk about in another video.
@@henryseg Is it just me, or does the simplified model look like a rhombicuboctahedron?
@@ValkyRiver It does!
I never owned one myself, but my brother had a genuine Rubiks™® cube in 1981ish, and they are tough as hell.
They don't just pop apart like the knock-offs.
So I was never able to examine the mechanism, but surmised it was like Henry demonstrated.
>They don't just pop apart like knock-offs
But on the flipside, try customizing an old ball core Rubik's brand. Or even turning it without using your entire god damn arm lol
Knock-offs have done all the innovation in cubes in the last decades, last I saw Rubik's only innovation was teaming up with a knock-off producer for a "Speed" cube.
@@Quiltfish to call Gan a "knock off" just feels so wrong. They're basically the top.
@@rubixtheslime It's all branding garbage. Rubik's brand is basically only good for the kind of people who think "Every solve method is cheating, I want to figure it out all on my own over the course of months".
Once again, circles are behind everything.
As a competitive Rubik's cube solver for over 10 years and someone who has gotten into twisty puzzle CAD design recently, this is an amazing explanation.
The only other way you could make a 3x3 mechanically is the way the "void cube" did it. There is also magnets only but those fall apart easily (it was how the 2x2 which came before the 3x3 came about).
Right, as I understand it, the void cube effectively has three layers rather than two, where the three layers allow one part to grip with a “C” shape around a neighbour.
Don't knock it, magnets only-tech is what gave us the 2x2x2x2 :)
@@Quiltfish damn, don't remind me of those, I'm not sure if I'm more tempted to buy a disassembled kit to assemble or to try to design a similar thing myself to print at home. Both options seem like a big money and time sink. 😅
Fantastic, thanks for sharing.
wait, i'm still not understanding how the corner doesn't fall in. Isn't its entire lip underneath adjacent pieces?
The lip is under the adjacent pieces, but there's still no space for the part to fall in. The "vertical" walls of the adjacent pieces are enough to stop it moving inwards.
hey I couldn't help but notice that you misspelled "do" in the title.
You obviously need 999 IQ to break one.
thanks for answering an old question of mine
Looks like this is a very simple mechanism and it works well for 3x3x3 cubes. But how about 10x10x10 cubes? I've seen that each piece seems to have a little leg with a foot on it that goes to the spherical slip planes of the mechanism and slides in a kind of groove that is formed by all the adjacent parts and in inner core. I think it would fall apart if a few adjacent pieces were missing.
For 10×10 you start from 3×3 mechanism and then keep adding larger and larger shell using the same interlocking principle.
Interesting mechanism there. You would have to be somewhat of a bright spark to manufacture one of these things, an utter genius to design one. It would be quite interesting if someone dug up some footage of these things being made, I suspect that that would be high entertainment.
How would you describe that inner Sphere rubik
That ball is a rubik sphere itself
Is there rubik cube (sphere🙄) with that configuration
The animation is so beautiful. May I ask what software you are using? I'd like to visualize some things as well.
I use Rhino/Grasshopper.
Thanks, I liked your video.
Cheap ones can apparently
58 I think of human ankle and many dislocations, sprains etc as a sphere STicking surface.
If bones leans too much to an egg, ovum, (B) el-lip-soid, axy-asyMMetry aches, e-gg-riv-ates.
I remember taking the cube I had apart and not being able to put it back together. It did look a bit different tho.
I think adding small dots in the correct color in the edges of those pieces would make the mechanisms still a Rubik's cube toy.
Your thumbnail successfully fooled me into thinking this was a Steve Mould video, right up until you spoke.
They do fall apart.
1:11 Not actually. For example fisher cube, windmill cube, mixup cube, axis cube...
Anyone who has ever properly solved a rubiks cube knows it. You break it apart, then puzzle it together correctly. Sure there are weirdos who rotate them to solve em, but they're weirdos and its not how to properly solve em.
I have a 2×2 cube and if you take out all the big corners. You get something like the mecanism in the video
Ive always break the rubiks cube just to put it back together.
Its not that fascinsting now.
So a Rubik's cube works both physically and mathematically like a 15-puzzle.
Fun fact: The rubik's cube has 43 QUINTILLION STATES that can be solved in a few seconds! Also, I have the same cube as you on start of video.
I always wanted to know this, and now I realize I always wanted to hear it explained by your voice.
Any speedcuber will tell you, they do, in fact, fall apart. Quite easily at that.
Why Rubik's cubes *don't* fall apart?
this isn't the innards of a genuine rubik's cube from the 80s.. instead of pealing off stickers and "solving the puzzle" like the other idiots who would ruin their stickers, we could actually bind the cube and pop off a corner and the remove the rest of the cubes, then reassemble it to make it look solved.
It is curious that you mentioned "that there is something magical about Rubik's cube", in portuguese and probably other languages, these are literally called "cubo mágico" or magic cube.
Here's a cute little ball.
Also look at the gears that open and shut the gates of hell.
Wait... what? 3:10
Cool video, but there's something super funky going on with the narration audio that's really distracting.
The Rubik’s cube doesn’t fall apart. It doesn’t do this because it knows where it isn’t-
No wait…
Darn it! You made be laugh.
Then why does my cheap rubik's cube falls apart everytime i move it? Checkmate Henry
this is so cool, this is exactly WHY Erno Rubik invented the cube, to teach about 3d design.
Meanwhile someone has ptsd from their 12x12 falling apart mid solve
I figured this out when I was a kid and would just pop the rubik's cubes apart and put them back together in order lol...
Great explanation. Lost more than I was before, but it was explained in a great way. Not a clue what's happening. LA dee daa
Obviously they have never tore one apart & snapped one back together 😂😂😂.
They break apart all the time...after I throw it against a wall because I can't solve it.
You had to make a 3D model to understand how a Rubik’s cube works?
Wow, first we're not even talking about a cube, but he can't even give us a proper _ball._
Goodness, man, you solved something that has bothered me for 40 years!
modern day speedcubes are designed differently, with out a ball core
You should tell my shang shou wind that it doesnt break apart. Maybe no ones told it yet.
here is a short explanation if you dont want to watch the full video: the cube has a core that has the center pieces attached to it and rotating. the pieces move by having a part that sticks out so it could attach to the cube
The Rubik's Magic Folding Chain is also ingenious.
Waaaait a sec… how did you manage to convince Sam Harris to narrate your video?
So nobody in here broke the rubics cube to see what's inside?smh
Aw i wish there was a link to the braiding gears. Great videos mate
oh yea there's 1 more ways to disassemble rubix cube
My Homer Simpson’s head 2x2 Rubik’s cube did fall apart ☹️
Bro get a proper cube, Rubik brand got there first and they're the worst, you'll enjoy cubing a lot more if you get a better cube
rubik's brand is good enough if you are not a speedcuber, there's no point in getting a betterr one if you're still gonna do 1-2 tps
then how about bigger cubes like 5*5
beautifully explained!
Mathematics is the glue of the universe.
Most modern rubik's cubes use 6 conical contact planes rather than 1 spherical one.
I don't see how 6 conical contact planes would work. The transition from one conical plane to the next wouldn't involve a smooth track for the pieces to move.
Do you have any search terms I could use to find one of these cubes with conical contact planes?
Rubik's cube is an invention of a Hungarian inventor Ernő Rubik.
Been waiting for this, but im still a little lost
I love how many of your videos are moving “picture analogues” of the parts in this idea, at one further level of abstraction, connecting to each other and holding the different ideas behind each mechanism to each other, and thus holding your amazing RUclips channel together too! Thank you for the interconnected layers of pins, rotations, and transformations of delight!
How could anyone see any of these and not hit subscribe? Wait-does that mean there’s a conceptual axis of rotation gearing your videos to my index finger, where it activates another conceptual rack and pinion mechanism between my finger and your subscribe button? 😊❤🎉
So the "cube" is a sphere.
What a lie.
In an actual cube the lip overhang isn't quite so pronounced and cubers disassemble one by turning a face 45 degrees and prying out a 2-sided edge piece. The center piece bolts are usually (somewhat tightly) spring loaded and there's also just enough give that this doesn't risk any breakage, and to reassemble you pop the last piece in the same way.
Though, the actual 3rd-party cube I use (and many like it) has some extra protrusions in a 3rd underlayer to prevent accidental popping so when I pry out an edge piece I have to take care to rotate it slightly. It's sort of a pain and I don't disassemble it very often. Though the springs and give are loose enough that I can rotate individual corner pieces by 120 degrees while still assembled, so there's that.
You can, in fact, remove an edge piece. And it is the first piece you need to remove in order to disassemble your cube to lubricate or clean it. You must turn a face 45 degrees so that the edge lines up with the corner of the adjacent middle row. Then you pop out the corner piece due to the tolerances of the cube and the force you apply. It's much easier to do this with a speed cube than a Rubik's brand cube. Standard Rubik's cubes are awful to try to learn on or disassemble, and as such, I HIGHLY recommend getting a speed cube if you want to try to learn to cube. My best time is 32 seconds (I know, awful) but the best time I could muster on a standard cube was more like 50-60sec due to the low tolerances, poor sliding, and no corner cutting to speak of. When I was learning, my hands ached and I was worried I had carpal tunnel, but once I ordered and received a YJ 3x3, all those woes disappeared as I absolutely FLEW through my algorithms.
So yes, there are many ways to make the internals such that they have adjustable tensions as well as can cut corners if you're over 50-60% of the way rotated in the correct direction. This allows for much smoother motions and an IMMENSE time save. There's not a soul on planet Earth that uses a standard Rubik's brand cube for speed cubing for these reasons.
My head just exploded 😱
Awful explanation.
A rubix cube is not falling because it's connected with the core
Only the six faces are connected to the core.
mhm
Fun Fact - I pulled my Ribik's Cube apart in the early 1980's to see how it worked. This wasn't long after they first came out. When I pulled it apart, it wasn't in the correct configuration, and was still in the process of being completed by me again. When I put it back together, in the correct configuration, and went through the book that I had to solve it. The book that I had used to solve it a few times before. The top four corners of the cube, what ever colour you were on, would never go back to their original positions. And always remained a colour turn opposed to the rest of the completed cube. Only the four corners of the cube when looking at it from the top down. It didn't matter how many times I tried to fix it or how carefully I followed the book to complete it, they never ever returned to the original configuration positions. Ever.
Right, the Rubik’s cube has different “universes” of configurations, that it is impossible to get between with ordinary moves. You need extraordinary moves (taking it apart) to get between universes.
@@henryseg I'm assuming that you are being somewhat narcisistically condescending in your reply. And not referring to the multitudinous methods to solve it. I hope that you are not, but that's what I am reading. If I'm incorrect then I appologize. I was about 14 when I first got one. Thank you for the reply none the less.
@@johnellison3030 Sorry, no, I'm talking about the group theory of puzzles like the Rubik's cube. The 15-puzzle is similar - for example, if you only use the usual sliding moves, it is mathematically impossible to get from the starting configuration of the 15-puzzle to the configuration where the 15 and the 14 tiles are swapped but everything else is the same. But of course you can swap just those tiles if you are willing to disassemble and reassemble the puzzle.
The same kind of thing is true for the Rubik's cube - it sounds like you inadvertently found yourself in another universe of configurations of the Rubik's cube. (I could be wrong of course.)
*cries in MGC square-1*
Because they're designed so that the front doesn't fall off.
That's what I'm saying, we took the rubiks cube _outside_ the environment.