World's biggest gear ratio...

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.

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[zenith]

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.

[baguette]

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

[collectorguy]

You can't spin the last gear, but what gear can you spin from to maximize speed of the first gear?

[pyglik]

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!

[lagcom]

I never thought I’d ever experience cosmic horror from such a small object

[OttoLP]

The last wheel cant actually spin right?

[CreativeMindstorms]

This is actually mindblowing! It must have taken a whole lot of time to make this video as well. Amazing!

[joshjones]

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

[OGbqze]

It would be cool to see a gearbox like this but with 2:1 gear ratios so we can see it actually working.

[crandonborth]

Last one will still prolly still make a revolution before GTA 6 is released...

[andysim]

Crazy thing is, if you could spin the first gear at an infinite rpm, the last gear would spin at infinite rpm too

[haydarlab]

Try to move the last gear if you can, the rest of the gears will rotate at fantastic speeds

[TheAngelChaz]

I would love to see how fast the first gear would spin if it was possible to spin the last!

[YazanMaklad]

Friend: Don't spin the last gear!
Me: *spins it just a bit*
Universe: *explodes*

[seephor]

I wonder how astronomical the torque would be on that last gear. Probably enough to move the world in theory.

[kasra.rasaee]

If you have a gear train with such a high gear ratio and multiple gears, there's a significant torque multiplication happening at each gear stage. By the time you reach the last gear, the torque applied to it could be immense, potentially exceeding the torque capacity of the gear teeth or the gearbox itself.

[paulromsky]

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.

[pilbomags]

These gears would dissolve before it even spun the last one.

[notlistening]

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.

[anlev]

1:59 DONT TOUCH THAT GEAR! IT WILL BREAK THE STRUCTURE OF REALITY!