How long will it take to spin the last gear? How fast would I have to spin the first gear to get the last gear to spin 1 time? This is the World's highest / largest gear reduction ever made.
New to 3D Printing? Start Here:
3dprinteracademy.com/blogs/ba...
Enjoy my videos? Want access to my exclusive STLs? Support 3D Printer Academy on Patreon: www.patreon.com/3dprinteracademy
Join this channel to get access to perks:
/ @3dprinteracademy
There's something like this at the MIT museum (or at least it was a piece there when I last visited): a gear train with massive reduction and the final gear is actually carved out of the stone that it is mounted to. It's impossible for the final gear to move, but the beginning wheels are still able to be turned.
That sounds kinda cool, tbh.
Imagine aliens coming upon this wall that is slightly tilted by a fraction of a centimeter in the future
For those interested, I've found the piece: it's called "Beholding the Big Bang" and it's a bit different than what I recalled (it has been years since I've been to that museum and seen the exhibit). The final gear is embedded in concrete, not carved out of stone, and it's an electric motor turning the first gears, not a hand crank. kzhead.info/sun/iad6Ytugp395oac/bejne.html
That’s really cool actually
the mechanical flex of all the gears probably compounds up
Damn just imagine the amount of force you would need to spin the last gear by hand and how fast it would make the first gear spin if you spun it from the last gear
The whole thing would explode but it would be glorious
Assuming the gears were indestructible and you could apply infinite force, if you spun the last gear, the first gear would be moving far faster than the speed of light
@@Godolotl but as you approached closer to the speed of light, from the gears perspective, time would be slowing down which would inadvertently slow down the rotational speed of the last gear who’s torque is probably enough to lift up the whole universe.
@@baconwizard well yes, but this whole thing is irrational to begin with. I mean that gear ratio is just a "because I can" thing. If you actually could apply infinite force, I'm unsure if you could ever actually reach the speed of light due to time dilation. On the outside it would appear close to the speed of light, but from the 'gear's perspective' everything would speed up. This weird dynamic is why the "speed of light" is so odd.
@@baconwizard but, I'm not knowledgeable enough to keep talking about this subject, that's getting into general and special relativity, which I don't have the confidence to speak openly about. Perhaps someone else will figure out a explanation.
You can't spin the last gear, but what gear can you spin from to maximize speed of the first gear?
I would like this comment but it has exactly 69 likes and I don't want to ruin that
I’ll ruin it
@@notlistening6499 been there, done that
you see him spin 3rd gear............thats about it
I’d have gone straight to the last gear
2:50 It's even hard to understand how MUCH BIGGER this number is. If EVERY atom in the observable universe had its OWN observable universe within it with the same amount of atoms, then the number of all the atoms COMBINED would've still be a HUNRDED THOUSAND times smaller than this gear ratio!
Thank you for that, my brain is malfunctioning now but still cool as hell
as if our universe isn't already mind blowing enough, lmao. thanks for putting this number into perspective :)
🤯
Horton logic lol
Your scaring me
I never thought I’d ever experience cosmic horror from such a small object
This is actually mindblowing! It must have taken a whole lot of time to make this video as well. Amazing!
It would be cool to see a gearbox like this but with 2:1 gear ratios so we can see it actually working.
even with a 2:1 ratio the last gear still would take an unimaginable time to move
Great so instead of 10^169 we get 2^169.
@@noahc8997 how about 101 to 100 teeth gears? then it will be 1.01:1 and 1.01^169 = only 5.37. Am I doing this right?
I'm working on my own insane gearbox using planetary and grinder gears to achieve a ridiculous 500:1 gear reduction per stage. It will only need 63 stages to pass your gearbox. The crazy thing is that the design has an extremely small profile with a thickness of just .25in per stage and an external radius of 5in. The total length of the gearbox will be just under 16 inches
I subbed to you!!! Can't wait to see it
thats so sick
Звучит как что-то похожее на часовой механизм
Crazy thing is, if you could spin the first gear at an infinite rpm, the last gear would spin at infinite rpm too
Idk about that
not really because of other mechanical factors
@@turzilla bro said not really😂😂. The first one spins infinitely so the last moves infinitely end of story. We dont care if it breaks or whatever this is hypothetical
@@nazfx2648 nah we do care so not really
It would create infinity mass black hole before the last grear starts moving.
The last wheel cant actually spin right?
After the sun burns out it might
What if i spin the last gear?
Well it won't even spin then :'(
It can just after the whole universe is gone
@@CroissantCreates no, I mean, since the plastic isn't strong enough.
Last one will still prolly still make a revolution before GTA 6 is released...
'bout that
Try to move the last gear if you can, the rest of the gears will rotate at fantastic speeds
Nothing will move because the energy required to turn the first gear is greater than every motor on earth combined. The wheel would need to be built to the size of a planet to not sheer from the force alone
@@CroissantCreates Right, he should lower the number of gears a bit
Is not possible! When you play with gears ratio you also play with torque ratio
the about of force it would take to turn that last gear would shatter it
He did that in another video, but with a much smaller gearbox. Probably close to the highest gear ratio possible in this style without major design changes. He got 1:1200 or so iirc, and that needed a foot long crank handle. m.kzhead.info/sun/kqWbXbijoHmooKc/bejne.html
Great video. Too bad you didn't include digits 0 to 9 embossed on each gear as you printed them. Then you could see how many revolutions of the first gear have occurred. Can you imagine the torque that could theoretically be put on that final gear.
Another video in my life of things I don't understand but still very intrigued and interested in.
😂
I wanna see how fast the first gear would go if you manually moved the last one. I bet the box would completely shatter
I would love to see how fast the first gear would spin if it was possible to spin the last!
Math.
You stole his pfp
Me too
It's literally impossible for him to do so, unfortunately. But I'd love to see what incredibly reality-warping things would happen.
10^169 times faster.
Spin the last one, i dare you
03NOV2022 - Back in the 1950-60s near Columbia, Tennessee, you could stop on the highway and see "Bullwinkle's Geared Monstrosity." It was made of pulleys and v-belts. Somewhere I still have a postcard from that. I've always wondered what happened to it.
The music at 3:21, where you start talking about Brilliant... How can I find it? I HAVE to have it!!
I wonder how astronomical the torque would be on that last gear. Probably enough to move the world in theory.
It could crush the known universe into a black hole.
in theory it takes more torque to rotate it than there is energy in the known universe
If you somehow got enough energy and force to spin the last gear, then you would open up a wormhole at the other end because it would go faster than the speed of light.
If we attached electric motor when we attached motor if we rotate 4 or 5 gear by hand then how much electricity generate ?
Looks great! Thank you for your video!
That's cool and all, but actually it is more than likely that friction will cause a good chunk of the gear box to never move at all, and rotating the first gear for long enough will cause some of the gears to simply snap.
🤯
How many estimated years would it take to get all the slack out of this contraption before the last gear could even move?
all the years
10^169 secs at minimum
We want the option 2 !!!
What 3d printer do you use?
What happens if you spin the grey gear in the 4th Row. will the Orange gear spin faster in the first row ? Just Curious!
Most probably it won't spin. It would require a tremendous amount of force to move it even a little
I really want to see you spin the last gear and watch what it would do to the first one if it were possible
You cant
last gear would break before you could make it to move
It could be very dangerous. 
How long did it take to print all of these
why didnt you make a handle and spin it
10 to the power of 169. That was on purpose. 😂
Shut up nigga
how did you make it?? do you have a video of it??
Please do it the other way to see how fast it will spin
That is literally impossible
@@jacob.rausch I know
@@jacob.rausch I know I just want to see
@@-LAWAN a normal human being can only spin the 4th or 5th gear if they are as strong as bruce lee
@@CodeBlueWiki theoretically if you move it like by a nano centimeter it will spin super fast
what if you spin the gear at the end would it just take to much force or would you go light speed
That opening pan shot 😍
Use a lever and try to turn the last gear, you might need a press for that
It could be very dangerous. 
@@MicheleRoccapinnuzza Yes, yes it could.
I would have like to see you apply some torque to the last year to see how fast the first one could spin.
It could be very dangerous. 
@@MicheleRoccapinnuzza why the ?
I once built a pig rotisserie doing something similar. 1725rpm motor to a final drive of 3rpm. The motor had a 2” pulley to a 12” via belt drive. On that shaft was another 2” pulley to a 10”, another 2” to another 10” and finally a 10 tooth sprocket driving a 40 tooth on the spit rod via a chain. I never did measure the torque but it was a lot.
Can somebody explain what would happen if you took a really high gear ratio box (not this high though, something like several thousand to 1) and then took the same box and attached it to the end of the first but in reverse? Would you be able to spin the first gear and have the last gear spin at the same speed, or would friction or some other forces prevent that?
Now make one just like this but with a low gear ratio See if you can get the last gear to break the sound barrier
You can create a black hole with this
Why make a new? Think!
@@XtreeM_FaiL because this one is built one way and to build it the exact opposite would be even cooler
@@drsatan7554 Turn it around.
@@XtreeM_FaiL I don't have it but even if I did the handle would be on the wrong side
What happen if you try to turn the last gear Does it break ? Does the first gear turn faster than the speed if light ? Or does it does nothing
the torque needed would be so high, that it would probably break the gear. so, number 1
@@odenroberts7603 allright, thanks for awnsering
Take it with a pinch of salt, Im not a physicist
If you turn by hand it would just do nothing. With a powerful enough motor, the gears would just break.
Can you list the file link places I want to try
At what speed was the first gear pinning in your calculations to reach the amount of time you’ve concluded, I was curious about changing the speed.
Spin the last one, I wanna see how fast it goes if it can handle it
It probably just would break, because the gear that is connected to also really doesn't want to move.
If I got the math right, if you spin the first gear once per second, it would take 3.17E+161 years to spin the last gear once (I don't think the number with that many zeros has an actual name).
In the Conway-Wechsler system which extends -illion naming infinitely, it's 317 duoquinquagintillion years.
Plz create a dedicated channel for this gear box and livestream it with running mode
Legend says he’s still trying to get the last gear to spin
Spin the last gear
Yes
imagine how fast the first gear would be spinning if you rotated the last gear
If you turned it just one thousandth of a degree every 100,000,000,000 years, the first wheel would spin billions of billions of times faster than the speed of light.
@@MicheleRoccapinnuzza🤯
Can you add up the amount of backlash to the final gear?
can you do a short where you spin whatever the highest gear you can?
It would be fun to calculate how much the last gear turns after the first has made a full turn. It should be comparable to planks length.
1st gear have to rotate trillons time to get close to Plank's length. No, I didn't bother to calculate that. Just a guestimation.
I want to see it turned from the last gear but I know that's impossible/ insanely hard
That's quitter talk
I’m exactly the same, I know in theory it’s impossible but it just looks so doable and I’ve never actually interacted with a gear array like this so I lack the mechanical understanding that it’s impossible
I mean if you could. That first gear would probably create an explosion because the atoms could no longer hold each other together.
its not insanely hard, its actually impossible
@@TantalumPolytope eh, it depends, if they’re 3d printed gears? Yea impossible, but with strong enough construction and enough force behind it then it is technically possible albeit theoretically
looks so cool.. great channel!
Something that is weird to think about is just how small the movement per second is...because if the high speed end is moving then the low speed one is too just so slowly you probably cant even see it under an electron microscope.
Does anyone have a STL/obj file for something like these gears??
We all want to see you try to turn the hardest gear before it breaks.
If it's not too much torque, could you spin the last gear by hand? or attach lever?
At what rpm is the first gear being turned to take 25k years. How many time does the first gear need to turn to make the last move 1 time.
what happend if you try to turn the last one is the first in front go fast to light speed ??
How long did this take to print?
*Spin last gear ⚙️ first* *First ⚙️ goes like 🚀*
legend has it these gears still spin today
Me: waiting for him to spin the last gear Him: no
I like the rear ratio vids in reverse, where the lowest gear is turned so we can see the super fast rpm at the other end.
This is at least the third version of a "million year" gear train I've seen on YT. Most colorful version, though.
aaaw, I wanted to see him spin the last gear. although I suspect the whole thing would break a few gears down. I think the trick would be to see how slowly you can move it to get the most gears spinning before it explodes. ;P
Really wanted too see it all turn 😩🤣
I want an entire video of his old gear box spinning until the last gear spins once
I've always wanted to see someone make an insane gear down paired to an equal gear up.
The reason it wouldn’t work (on this gearbox anyway) is because even with the fastest motor in the world spinning the first gear you’d die long before you could even get all of the lash (slack) out of the gear train. You’d never see the “gear up” side move at all.
Okay but can you imagine the torque?
How much torque would you need to spin the grey gear
the desire to rotate the last gear myself got so big that i tried to grab it through the screen
Wait... So if you manually turn the grey one, does that mean the one on the other end is gonna go faster than the speed of sound? I think it might break though
now to the inverse toy------a 1:10 gear ratio, how fast can you get the final gear moving before it breaks apart, or something breaks!
Imagine the torque that thing has.
You can make a more compact one with work gears
Hi please I'd like to know what happens or what it takes to move the "last" gear... Does the "first" would spin so fast that it would break? Or ir simply reverses and the reduction is now the other way around?
why the quotation marks?
and also he said that if he could spin the last gear the first would spin faster than the speed of light which means that yes, it would be atomized immediately
Its crazy how quickly exponential returns can get unimaginably huge. A deck of cards is another example. The odds of shuffling a deck of cards and them returning to an order that any deck of cards has been in, is so small, it could be considered impossible considering the combinations made in the past and future. To give a visual understanding, if you were to begin writing the possible combinations on paper with each paper having a new combination, you would stack them up until they reach the moon, then pull a drop of water out of the ocean and start a new stack. When the ocean is dried up, refill it and destroy a single grain of sand. When all the sand is gone, the number of combinations you have gone through are still 10 zeros away from 1/8 the maximum number of combinations. The number of combinations looks like 8.0658*10^67 For a little more perspective, the universe has only existed for 4.36*10^17 seconds.
i would love to see you try to turn the last gear
what would happen if you rotate the last gear first
How many light years of backlash is built in it?
Now spin the last gear once, to achieve the speed of light
You can't , its too hard
Did this dude use spacers yet? Or are the gears still flopping around
That is mind-numbingly mind-boggling. !!
Loved this. Sounds cool too
you can put that in a time capsule
Great channel. I just joined up. Here are some thoughts I'd like to bounce off the community. I bought an Ender 3 last year so I could build things with my 5 yo son. Namely, I want to build gear ratio and mechanical motion demonstrators--which is a perfect fit here. I had pondered using Lego Technic. But I don't have that sort of budget. Your channel seems to solve that problem, with a 3D printer at hand, at least. And I'll admit I mostly don't want to get into designing actual gears. Done properly, that's an endeavor I just don't have time for. But I do have time to design drivetrains from a known set of gears. And that's where I want to spend my time on this project with my son. It will be up to him to take it to deeper design territory. I'd love to get into any efforts along these lines with anyone who wants to or is already doing projects with their kids. Thanks all, Tim
you should make a reverse one and connect them together and see what happens
im gonna use that video in an argument.
I'm still waiting for someone to make a bicycle outta this
Shoutout to the guy who photographed the observable universe
what happens if you spin the other wheel?
Incredibly geeky, I love it!
If you turn the gear at the other end, would it exceed the speed of light?
try thing about worm gear, it's more compact and more ratio then regulars.
You should try to make a clock using this gear ratio.
this will be hard to ratio this ratio
Why didn't you spin the output so we could see the gear ratio on the input?