Lego kinetic sculpture. How is the top not moving?



View original post [gfycat.com]




Comments:

7 Dec 2017 23:05 - +1804
Try following just one "strand" from the bottom you'll see that each one is simply turning in circles and as such apply the same amount of lift/stability to the top.
7 Dec 2017 23:22 - +376
For each spiral, the top and the bottom are on the same vertical line. So spinning around that axis would mean zero movement on those points. They are arranged so that some spirals spin in clockwise direction and others in the opposite direction. This looks confusing, but imagine each of the spirals replaced by straight vertical shafts. The current set up is mechanically identical to that. That is why the top doesn't move.
8 Dec 2017 00:19 - +108
This is blackmagicfuckery for those with really weak observation skills.
7 Dec 2017 23:39 - +92
/u/stabbot
8 Dec 2017 00:03 - +37
A real life ayatan sculpture
8 Dec 2017 00:28 - +31
Because Hermaeus Mora.
7 Dec 2017 23:18 - +12
All it is is a rotating S. The top and bottom are both stationary.
8 Dec 2017 00:54 - +11
I wish the coffee mug was standing on top of it.
8 Dec 2017 02:26 - +9
Why would the top be moving???
8 Dec 2017 00:59 - +6
This is the same principle used for a ["dancing shelf"](https://www.amazon.com/Dancing-Standing-Rotations-Vibration-free-Aluminum/dp/B013GV87VS)
7 Dec 2017 23:40 - +6
Original post: https://www.reddit.com/r/mechanical_gifs/comments/7i5d89/lego_kinetic_sculpture/?st=JAWNFL83&sh=b02fff23
8 Dec 2017 01:39 - +5
/r/warframe
8 Dec 2017 01:54 - +4
I hope that question wasn’t serious. Very cool though.
8 Dec 2017 02:32 - +3
I'm not sure about the top, but I believe this machine wants to mate with me
8 Dec 2017 02:34 - +3
Each vertical component is of similar design to a Darius turbine, the only fuckery here is that OP thinks the rotating, curved bits are somehow flailing wildly from side to side.
8 Dec 2017 01:07 - +3
Glitch. I’m tired of god releasing these unfinished add-ons to the world, he needs to beta test this shit before sending it out to everyone.
7 Dec 2017 23:35 - +3
Magic
8 Dec 2017 01:04 - +3
same reason the bottom isnt moving...
8 Dec 2017 01:01 - +3
The top is moving. The arms aren't all synced, so it's moving a little bit.
8 Dec 2017 02:17 - +2
Imagine 2 people holding a rope. One swings the rope, the other person keeps the rope as I'll. That is how.
8 Dec 2017 01:16 - +2
BURN THE FUCKING WITCH
8 Dec 2017 01:01 - +2
Probably because the forces acting upon it balance out. Either that or magne-*AHEM* I MEAN BLACK MAGIC!
8 Dec 2017 02:25 - +2
I can see why the top isn’t moving, but the fact that those don’t collide with each other confuses me.
8 Dec 2017 04:28 - +2
Ball bearings/well lubricated ball and socket joints would be my guess. Even though they are moving individually and sort of rotating at one place, it feels like the angular momentum should cause the top to move. However, the top joint does not get any load from the rotating thingies because of how well lubricated/free the joint is and only uses the rotating beams for support on the z axis.
8 Dec 2017 02:48 - +2
Put four legs on a chair. Put it on the ground. Spin the legs. The chair doesn't move. Now make the legs curvy. Spin the curvy legs. The chair still doesn't move.
8 Dec 2017 02:44 - +1
it is moving a tiny bit
8 Dec 2017 03:46 - +1
Because it’s staying in a lace with no force on it
8 Dec 2017 04:14 - +1
The summation of forces = 0
8 Dec 2017 03:19 - +1
Witchcraft
8 Dec 2017 04:33 - +1
Physics
8 Dec 2017 04:04 - +1
someone get this kid a speedcube
8 Dec 2017 05:21 - +1
Man, this makes me wanna build some cool shit with Legos again
8 Dec 2017 03:07 - +1
>How is the top not moving? It's in your title. "Kinetics"
8 Dec 2017 05:37 - +1
You know what else shouldn't be moving? The camera.
8 Dec 2017 03:39 - +1
Those are microbots for sure. Saw them on a documentary titled “Big hero six”
8 Dec 2017 05:47 - +1
Make me a table like that pls.
8 Dec 2017 03:57 - +1
the connection points at the bottom and top are aligned
8 Dec 2017 06:02 - +1
Does this somehow represent a function with zero curl?
8 Dec 2017 02:30 - +1
Why would it move? The pillars are not moving, simply rotating.
8 Dec 2017 01:26 - +1
The spinning columns aren't actually connected to the top platform. They are lightly held in place by red axle rods that are simply sitting inside the holes on the platform - very minimal friction.
8 Dec 2017 02:52 - +1
Does anyone remember that snake game that had 4 snakes spinning like that and you had a fork thing to remove rings.... /r/nostalgia is calling
8 Dec 2017 05:03 - +1
Because at every instance in the cycle, the sum of forces in the x, y, and z direction is equal to zero.
8 Dec 2017 03:09 - +1
That’s wild
8 Dec 2017 01:27 - +1
I'm guessing they used this piece which allows for spinning. https://www.sjbaker.org/steve/lego/small_black.png
8 Dec 2017 03:28 - +1
This is a really awesome concept for a coffee or end table. Metallic or glowing moving parts with a pane of glass on top. 10/10 would buy if i could afford it (no way in hell I could)
8 Dec 2017 01:28 - +1
Half of the spinning columns are spinning clockwise, the other half spinning counterclockwise.
8 Dec 2017 03:44 - +1
I used to have a lamp that was similar to this from Spencer’s. It had a blue cloth wrapped around it so it looked like a moving wave or something. It was cool for 12 year old me
8 Dec 2017 02:05 - +1
Looks like there’s a ball socket right below the top of the structure allowing for whatever is above that point to remain stationary.
8 Dec 2017 03:46 - +1
The force is balanced young padawan.
8 Dec 2017 02:11 - +1
I see that they're all just turning circles I'm not seeing how they aren't striking each other though. Are they each just swinging precisely missing the others?
8 Dec 2017 04:01 - +1
Each connection constrains the top as if it were a plane, around one vertex. This creation would function similarly to the way it does with as little as three arms.
7 Dec 2017 23:07 - +1
I think it comes down to it being balanced. So each spinning support on it's own should pull it into a circle but with each of them pulling in different directions it stays stationary.
8 Dec 2017 04:11 - +1
Clearly it's a case of black magic fuckery.
7 Dec 2017 23:57 - +1
Because it does not know in which direction...
8 Dec 2017 04:18 - +1
Reminds me of the [hula-hoop prison from 1978's 'Superman: The Movie'](https://youtu.be/2u3eQc_rx54).
8 Dec 2017 00:17 - +1
It swifts slightly, but is overall stable because the the strands are synchronised to turn in opposite directions, and the top and bottom hingues are loose.
8 Dec 2017 04:55 - +1
is there an printable version... with a handle crank?
8 Dec 2017 01:02 - +1
That is really cool, i did a quick google search of the nameplate in front of the sculpture, which i believe says Slithy Toves, and found the building instructions here: https://rebrickable.com/mocs/MOC-6090/aeh5040/slithy-toves-kinetic-sculpture And looking further into what Slithy Toves means, it is mentioned in a nonsense poem written by Lewis Carroll called the "Jabberwocky".
8 Dec 2017 05:31 - +1
Because of the way it is. Obviously the little cylinders can spin around in place.
8 Dec 2017 01:03 - +1
All of the bottom ones are connected to the top one so since all movement is connected to the bottom there is a free spinning mechanism at the top which does not move from the point of origin so there is no movement.
8 Dec 2017 05:37 - +1
They aren't all spinning in the same direction.
8 Dec 2017 01:09 - +1
I would actually be more excited to see the 'ball factory' next to it.
8 Dec 2017 05:55 - +1
Both group of axis rotate counterclockwise and cancel each other
8 Dec 2017 01:27 - +1
You gotta put like M. Bison or Magneto standing on top of it.
8 Dec 2017 04:03 - +0
The unsolved Rubik's cubes irritate me. If they can build that then solve a simple Rubik's cube. Like it only took me a month or so to get down to 3 mins and 30 seconds personal best...
8 Dec 2017 00:35 - +0
magnets.
8 Dec 2017 03:39 - +0
r/Warframe Are we the Orokin? Is Lego the prototype Ayatan?
8 Dec 2017 04:04 - +0
Tell me a one reason why it should, retarded OP.

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