Build & Test Lego Gearboxes: 2, 4, 6, 8, 12-speed

Each gearbox is built from scratch and then tested for speed and torque. Flat layouts only (gears are on the same plane) for better visualization. Enjoy!

00:00 2-speed
01:09 2-speed with driving ring
02:31 4-speed
04:02 6-speed
05:58 8-speed with range change
08:29 12-speed with splitter
11:48 all gearboxes side-by-side
12:09 graphs

Key Lego parts used in this video:

Check out a great resource on Lego gearboxes:

[lucasdomingue]

I have never understood more intuitively how gearboxes work. 10/10 educational content.

[drpants]

What they thought Legos would be: A great toy to help kids learn problem solving and creativity!
What it really is: A great tool for much older people to make prosthetic limbs, lego working submarines, and lifesize cars.

[lightningstrike]

I love how this shows the basic design idea for most manual transmissions, with high and low gear settings and over drive implementations. Definitely a great starting point if you want to learn how manual car transmissions work.

[adizzmal]

These plastic straight gears might be stronger than my NA Miata’s 5 speed.

[TNels]

This is a great demo of how these transmissions work. It would be neat to see a combination of the 8 and 12 speeds versions show here, to represent how a 18 speed works in a tractor trailer.

[taylors]

The gear grinding... you should make a clutch.
Could use those bulky rubber wheels as clutch pads, spring suspension or pneumatic pieces for pressure?

[TheGribbleNator]

That 12-speed splitter is an incredibly intuitive example for explaining the concept of splitting gears to someone.

[Xizilqou]

Neat, this helped me realize how gearboxes work

[Bobis]

7:45 the reason the clutch exists on manual cars stopping the gears for a second so the synchro's can engage properly

[danielbrazell]

Eventually you're going to build a full, life size car out of LEGO that can go 0 to 60 in 5 seconds, and is somehow only powered by a single LEGO motor.

[samii_leopard]

All you need is a clutch, a reverse gear, and you'll truly teach how gearboxes work, i had no idea this is the deal about those

[jyotigupta]

Isn't it fascinating that just by moving some parts you can achieve different speeds. It is truly amazing

[erlendstaavi]

i have seen several videos on how a transmission works, with fancy 3D graphics and narration, but was still hard to undertsand.

This made me get it. seriously.

[aliozanerbektas]

If only engineering classes were introduced like this...

[MrLazyAmerica]

As a truck driver, this is a good visual. 05:58 8 Speed shows what a typical 8 or 10-speed manual does and 08:29 shows what an Eaton Super-10 10-speed shifts like.

[matthewmondragon]

Just a reminder as a mechanic:
•Less speed, more torque.
•Less torque, more speed.
•Gear ratios is how many spins more than the original one(for example 2 gear ratios is 2 more spins than the original)

[kagno]

Mechanics explained the simpliest way! And how satisfying, if you multiply rpm and nm for each gear combination you end up with the same output power. Need this in schools!

[KudoShinichikun]

When we needed him the most he shows up!

[ThePolandball]

As an engineer that actually develops transfer case and low range gearbox systems, that 2 speed gearbox is kawaii as f***😍
Great video!

[kjanaa]

I don’t know if it’s possible, but could you rebuild an automatic transmission/gearbox with Lego bricks?