This Sphere Defies Gravity (but how?)
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- Опубліковано 7 вер 2024
- This magic ball seems to defy gravity, but it has a clever secret!
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A good magician never reveals his secrets... But an engineer will
Instructions unclear, made a Dyson sphere.
God damnit every time
*throws into large bin full of future marvels*
"I accidentally built a Dyson sphere but I forgot to put it around the sun"
Good one. Coincidentally Freeman Dyson died just two days ago.
Skull HQX Yeah I saw that this morning and was slightly weirded out. Maybe if I comment about Kim Jong Un, he’ll suddenly have an accident as well.
NGC 7635 hey don’t forget the head of the World Health Organization... this guy is REALLY corrupted
A fan of Grand Illusions, and Smarter Every Day....
Nice.
I can’t like your comment. I’m sorry, but it must be this way
Grand Illusions has the only intro that I don't skip over. It embraces kooky, while everybody else is trying too hard to be cool.
Dude your dedication is so hard core! =D Love it, so indepth!
Omg sparky what the heck are you doing here? You cant be hiding in the comment section like that XD
The fuck
@@Anikin3- ?
@@benhead8236 This is where I learned how to 3D print and much more! hehee
@@SparkyBites Valid excuse i suppose. Have you combined suits and 3d printing yet?
I'm intrigued by this lonely resistor on your desk... 🤔
Nice catch! Honestly I was just using the leads to help poke the thread into the pulleys ... 😅
I had to rewatch the whole video to find it :D
2:24
I was reading the comments and found this one look back at the video and saw it
I saw that. Went back to see if I could read the value, but I'm fear the colors will be off.
Never in my wildest dreams would've have lived the day where Agnus and Tim collaborate. Its such a disconnect from reality, like creatures from alternate realities met up, but I'm so here for it.
OK, as a kid (some 30-odd years ago) a friend had a He-Man action figure called Webstor. This figure had a grapple on a string connected to a backpack at the top, the bottom of the backpack had another string and a plastic loop.
I was bloody obsessed to know how *pulling* a string made the figure rise up the string.
That's been bugging me for 3 decades!
Thanks Angus! ❤️
Angus, that's amazing! To me this seems like an impressive achievement on your part.
The mechanical design has to have been quite a job. Well done.
I think that the pulley will start going to the right and the part will stay in the same position when you pull
Well, i was wrong xD
I was wrong initially too haha it's so confusing 😂
@@MakersMuse I rewinded that part of the video like 4 times to finally understand it😂😂😂😂
Obed Canario what does this even mean? The part is the pulley?how can the pulley move but the part not when they are the same thing?
4:47
Repressed memories: remembered
*internal screaming*
Hey Angus!
You've done a lot of interesting mechanisms, this is a really good one! 😊👍
Please check out the Rolamite Linear Actuator. Supposedly this is a zero (very low) friction and zero (very low) backlash actuator.
I would love to see what you come up with.
It would also work with curve of constant width bodies, which you've already covered.
Tim from Grand Illusions is just adorable, I love that you got the idea for this from his videos, he really is good at finding interesting, and unique things
Gravity: **Exists**
That gold ball: * And I took it personally *
I am adding a mandatory comment for my favorite 3D printing and design youtuber. I have seen the community message where the comments are trashed by UA-cam
2:50 mathematical solution: for some ratio of x:1 pulleys (x is bigger than 1), the 1 pulley should move right by an amount p. the right string shortens by p, therefore the left string gets longer by xp. The total motion of the left point of the string is therefore xp-p. Since the left point is moving by some distance d, we can solve for the amount p = d/(x-1). since x=2 in your case, the distances are equal
The trick works because it's designed to make people think it's a single piece of string, not two pieces wound round a pulley system.
Now add a mainspring for tension.
I vaguely recall seeing a similar toy as a child in the early 1980s (at the Perth Royal Show, I think). That one had a small, but heavy-ish ball with a fuzzy worm/dragon hanging off it & had plastic loops at each end or the threads. I had completely forgotten that time, thankyou.
This becomes much more intuitive when you realize that a pulley doesn't have to rotate about its center/axis. If you consider the connection point of the two strings, you can easily imagine a point right between them, and see that both strings are applying a clockwise torque on the pulley.
I had a grappling hook toy as a child that used this principle. It's still fascinating.
Well that was awkward, Just walked into my wife's office to show her the Magic Sphere and exclaimed if she blows on my magic ball it will rise...only to realise she was on a Meeting!
@@dapperwolf465 r/thathappened
Jace Becker it’s called a joke... so r/wooosh
@@1stmidnight565 What joke?
Sadly not a joke, later after she stopped shouting she did say it was cool.
@@RobBates2545 yeah thanks for clearing that up
From a physics prospective we have the tension of the string equal at both ends, so that the system’s resulting force is 0, but the angular momentum of the forces on the pulley is what is not 0, having 2 different radius, assuming a reduction of 1:3, the inner one is 1/3 the other, and since the momentum is directly proportional to the radius this difference propagates to it, and the resulting addictions of momentums is not 0, but dividing it by the moment of inertia gives us the angular acceleration of the pulley itself along the string, multiply the angular acceleration by the highest radius and here is your tangent acceleration along the string!
This is a classic illusion, so I'm not surprised that you couldn't find much published about how it works. :) Magicians are notoriously reticent to reveal their secrets. Amazing work on your part. Thank you for sharing.
Nice design and reverse engineering. I'm going to have to try making one of these. Thank you.
How clever, the captions were covering the lower hand 😂
Just surfed in, Kevlar thread wors well and if you attach a ring or similar to each end of the string it will improve the rapid presentation and can be used as a misdirect.
Years and years ago I had a "Major Matt Mason" astronaut action figure made by Mattel, who had a jet pack that worked exactly the same way. It was pretty cool back then too! Thanks for the video and the design! Stay safe and well everyone!
I was creating weapons for a manga series years ago and designed ball sharpies yo-you with a similar design wow
Did you know you can get "invisible" sewing thread? It's maybe a bit too stretchy for this but it's got to be worth a go. The thread's really useful if you don't want to keep a wide range of colours for fixing tears and the like in clothes (it's a sort of transparent plastic IIRC). If it worked in this it would make it more like "magic"!
I love that you watch Grand Illusions!! :D
5:15 *evil laughs in dual extrusion*
pla and petg would fix that :P
Is Petg the main material with PLA as the support?
@@reignandbongao9497 it should work either way but I've never tried it myself. My printer has had a wobbly extruder drive gear on one of the extruders since I bought it. (The corrona virus killed my plans to fix my printer any time soon.)
Might try this with fishing line and glow-in-the-dark filament!
YES! I love Grand Illusions!
Not derailing but despooling. That's what we call it in fishing, too. Great video, Angus.
Your enthusiasm for the art is inspiring - Thanks!
You've beat me to it, Angus! I wanted to make one, but couldn't come up with a fully 3d-printed version...the challenge is still out there, I suppose. Thanks for such a detailed tutorial!
You should still give it a shot it's a great design challenge and there's many approaches!
www.thingiverse.com/thing:3883301
Okay, I'll give it a go sometime, thanks!
It will move up because as you pull the string on the larger pully the one on the smaller one is unwinding more slowly than the larger one.
This is used in some roped ferrys, depending on situation they are in, this lets you pull a ferry away from you when you are downstream without doing a full loop of rope.
I love the things that come out of your interest in mechanisms like this.
The small pulley winds and unwinds twice as fast as the large one. The size ratio of the big pulley to the small pulley means that the ball can climb with less resistance. since the added amount of rope outside of the ball remains roughly the same there is an illusion that the ball has climbed the rope.
Did not think the string would lengthen that much!
The smaller pulley will unwind always less than the bigger pulley, so since we want to increase the length of the string, the direction of the movement of the pulley will be towards the right, it'll make the bigger pulley unwind and the smaller pulley wind, increasing the length of the cord.
Finished mine tonight and it works great, brilliant model, thanks Angus from a fellow ozzie.
One time in primary school we had a show and the man on the stage had a cube on a rope that was working just like this ball and I’ve been wondering a long time how did he make it go up and down, now I know, thank you
As a fisherman, I can tell you braid does stretch, just not a lot haha
Thanks for being the new wave of 3D printing scientist.
same force on both pulleys, but the string on the larger pulley exerts more torque (longer lever) than the string on the smaller pulley so the axle turns in the direction of the string pulling down and by that the thing rolls up.
I Really like your gundam t-shirt man
I want Tim to take his apart and see how close to yours it looks.
If you insert some small metal tubes in the holes where the string goes through, you vil prevent the string from cutting into the plastic.
Wow! Best explanation of gear ratio i ever seen
For getting better surface quality of spheres you could try adaptive layer height to make it smoother
It does help a bit but still suffers more imperfections, I demand perfection!
This mechanism can also work in reverse i.e. by moving the sphere you pull the ends of the strings together. The force you can generate depends on the difference in the size of the two pulleys. The closer in diameter they are, the larger the force (theoretically infinite) and just using two pulleys rather than several like on Destin's model. The caveat being you can only move the ends of the string a small distance; up until the pulley reaches the ends of the strings.
Thumbs up for WINGSPAN by Stonemaier Games "hiding" in the background.
I wonder if a "rubber plug" would introduce enough friction to keep the string from coming off of the pulley. Make it very close to where the string meets the pulley, I would think, might be the best place.
Nice! Not knowing, and not going out to google the result or do the math... I would've imagined the result after your 'pause' would have the pulley going halfway. Very cool.
Gravity: (Exists)
This sphere: *So you have chosen death*
Time to get back at newton for taking away our flying powers.
Ur everywhere :V
I think the pulley will move to the right, because when you pull on it you apply a force of X, but it’s direction is flipped and it’s magnitude multiplied by 2 in the pulley, so the net force is to the right.
I've thought about this mechanism so much and now it turns out it actually exists! This is awesome
Nice solve. Great explanation on the concept
I love this video! I originally thought how can two pulleys fit in that small ball but.....good job designing it!
Whe I was a kid, we used to have a ceilling lamp that had the same mechanism to lower and rise !
Superb presentation & narration.
I was confused at how it worked until you showed it being threaded - so my gut reaction was “that’s not a pulley, that’s a spool!” I’m no expert though so idk
I would really like to see the 3D printing nerd printing this, but incredibly big. The only problem i guess it could be to make them turn, but he some how always finds a way to make his crazy proyects work.
Back in the late 1960s there was a toy from Mattel called Major Matt Mason. He was an astronaut and this is precisely the way his jet pack worked. en.wikipedia.org/wiki/Major_Matt_Mason
I think as the large puley will need twice length to move up in comparison to the small puley, the system of puleys will move towards the fixed end. Maybe not.
If you have a bmg, now you understand what is ratio gear 😊
The print file is free? No strings attached?
Same pulley mechanism used to make the first ever mechanical pulley elevator in the ancient times
Try making a tensegrity sculpture, they are awesome.
Sooo. Diferential pulleys can fun too? Gotta love mechanics.
Another Grand Illusions fan! Awesome!
Great work too.
if you have ever had to pull a stuck 4wd backwards and only had a front mounted winch, this is the same principle you would use. i takes a while to get your head around in the bush. with cables and straps and snatch blocks everywhere. good times.
I want a makers Muse and grandillusions crossover
make a thinner transparent string, fishing line would do great.
Great video as always, Angus!
The other day, I watched a lot of videos on how to splice filament (eg. when a spool runs out and you have to pause printing).
-I expected to find a real good way, but none of the videos I saw were really appealing.
In other words, the methods either took a bunch of retries, were too time-consuming or simply required a bunch of bulky tools.
Which method do you use yourself ?
A big hi to you from Denmark.
I hoping to get a Ender 3 for this Christmas!!! Can’t wait!!
this would be cool as a fishing bobber. so little kids know to reel in the line if the bobber comes out of the water
i wonder if the the outside of the polly slightly pinch the wires would help prevent strings getting lose
It will move or pull the larger pulley down but wind up the string on the smaller pulley moving in up
You could probably add some Perler beads to your string end loops to make sure the ball doesn't run off the end of the string. It might be a good idea if your house has young kids in it who like to pull things apart and misplace the pieces.
You should 3D print chocolate molds.
Nice work!
I'd limit the inner part to 45° overhang and deviate from a sphere to a sphere capped wirh truncated cones. No need for printing these extra shell.
2:36 My guess is that the two pulleys will move 50 mm to the right.
Gravity must be like: *HOW DARE YOU DEFY MEEEE ALLLLMIGHTY GRRRRAVITYY*
Very cool design thanks!
I can only imagine what you guys could come up with if you did a collaboration with Tim.
Keep up the good work!
More simply you can do this with rubber bands. This is definitely the cooler way to get this effect.
Beautiful workmanship!
G'day mate
You make our fellow Aussie proud with your dedication to the 3D world.
Goodonyamate
Greg
at 1st I thought the ball was meant to look like its hovering and didn't expect people to see the string.
I think my grandsons are going to love this. Only problem I have is that the outer shell appears to be too small. I have to increase the size of the 2 outer shells and the ring to 101.6% to get the inners to fit inside. Otherwise I love it.
Thanks
What if you make this an elevator?
Edit: the generator could be put at the bottom and the weight of the lift is supported by the ceiling instead. The strings at both the top and the bottom can also help stabilising the elevator so you wouldn't need an elevator shaft anymore and the whole thing can "levitate" in the air maybe :)
Really cool!
Thanks for giving us the files for free!
This channel summarized: “I saw this on the internet and I wanted to 3D-print it”
What are 3d printers good for, you ask?
HOMEMADE TOYS.
Let's go!
Physics at its best
I think you could solve some of the problems by having the rolls mounted vertically.
Give it wings - now it's the Snitch from Harry Potter
Multiple pulleys with coil springs in them to make it change direction a couple times as you pull it
That outer shell is a great idea. Snap on rocket anyone?
Cool project Angus! You got me intrigued so I modeled one up tweaking the design a little and after a couple prints got one working. It works really well operating up/down etc. as long as it's operated slow and smooth otherwise I run into the de-spooling issue. Wondering if you were able to resolve that problem with your design. Would make a great toy for my grandson if not for that.