Watch Black History and Culture Videos all year long ➜
Get smart curated videos delivered to your inbox.   SUBSCRIBE
The Kid Should See This

20 Mechanical Principles combined in a Useless LEGO Machine

Watch more with these video collections:

Not only does the Brick Experiment Channel demonstrate 20 different mechanical principles with LEGO in this video, but they also fit together into a do-nothing LEGO machine… though it does slowly turn a mini-fig.

Watch as each mechanism, from a Schmidt coupling and a constant-velocity joint to an intermittent mechanism and a worm gear, clicks together. The contraption uses 520 LEGO parts and a cotton string.

The complete machine
Then build one, some, or all of these mechanisms: Brick Experiment Channel includes links to the MOC kit and free building instructions. The latter includes short definitions for each component. Find a quick list below:

00:00 Schmidt coupling
00:17 Constant-velocity joint (CV joint)
00:30 Universal joint
00:42 Bevel gears
00:53 Slider-crank linkage

01:08 Sun and planet gear
01:25 Scotch Yoke
01:40 Chebyshev Lambda Linkage
01:58 Chain drive
02:13 Belt drive
02:32 Constant-mesh gearbox
02:50 Oscillating direction changer
03:06 Torque limiter (Lego clutch)
03:19 Winch
03:34 Rack and pinion

rack and pinion

03:47 Offset gears
04:00 Uni-directional drive
04:22 Camshaft
04:38 Intermittent mechanism
04:52 Worm gear
05:11 THE FINISHED MACHINE

40x speed
Watch these LEGO engineering videos next on TKSST:
Two small DIY LEGO Technic spirographs
Modifying a climbing LEGO car design for 15 obstacles
• Making the Longest 1:1 LEGO Gear Train
• A Sisyphus kinetic sculpture made with LEGO
• The LEGO Great Ball Contraption: 17 different modules of incredible

Bonus: Jason vs The Ultimate LEGO Machine (LuuMa EV3).

This Webby award-winning video collection exists to help teachers, librarians, and families spark kid wonder and curiosity. TKSST features smarter, more meaningful content than what's usually served up by YouTube's algorithms, and amplifies the creators who make that content.

Curated, kid-friendly, independently-published. Support this mission by becoming a sustaining member today.