Making the Longest Lego Cardan Shaft
2024 ж. 20 Мам.
3 575 057 Рет қаралды
Building and testing universal joints and cardan shafts with Lego Technic.
Chapters:
00:00 Universal Joint
01:55 Cardan Shaft Offset
03:50 Cardan Shaft No Offset
06:27 Car
BuWizz 2.0 Bluetooth controlled rechargeable battery box - buwizz.com/shop/1-buwizz?ref=155
BuWizz Motor - buwizz.com/shop/buwizz-motor?...
Camera used for this video: amzn.to/3Hxisci
Microphones used for this video: amzn.to/3HpIxdY
Please note: I get a commission if you buy via Amazon or Buwizz link above. Thanks for your support.
Where I get my parts: www.bricklink.com/v2/main.page
#bricktechnology
#legotechnic
#lego
#asmr
#universaljoint
#buwizz
#engineering
#cardanshaft
#experiment
Check out my newest video: kzhead.info/sun/kpuwp85xgJGHqnA/bejne.html
The fact that you go back and edit them all 😂 mad respect
Using a guitar pick to illustrate the turning speed fluctuations for people on smaller screens or if the camera didn't pick it up was a *really* clever way to do it - very cool!
I couls see it just fine on my phone, but the sound somewhat helps
I think that something similar was also used in an old kardan shaft explanation video by ford or some other car brand in the 50s.
@@DasSparschwein I remember the same video. It’s a timeless method.
I wish he had contrasted that with a CV joint.
Is that really a guitar pick? It’s huge…
This is a great example of why it's important to phase your universal joints properly in all use cases.
Or use CV joints!
@@villageblunder4787 Yeah exactly! Because your output shaft may me nice and stable, but the intermediate axle not being at a stable speed will be noticable at higher masses/higher rpms.
Oh thank you, now I know what to search the internet for in order to understand what's the point of this video.
I didn't even know this is a problem but will deffinitly keep it in mind if I ever need them for a design
@@villageblunder4787 Lmao of course, or use cv joints. CV joints are definitely better but in situations where only UV joints are gonna be used, definitely phase them properly or you're gonna have a bad time
Thank you for perfectly illustrating how small losses in a mechanical chain can add up and cause failures.
8:52 We will miss him. He was a great man and a good friend. Rest in Peace
Watching the motor slowly die as there were more and more sections added was heartbreaking.
Yeah
Ye haha
And motorbreaking
This channel should be renamed to "brick torture".
It felt like everything was going to explode at any moment
The issue with your "no offset" design is that there is still an offset, its just a very minor one. Because its spiraling outward, the angle of change is not exactly 90 degrees, but slightly larger. Over 60 iterations, that small angle has added up to a large offset.
wouldn't it still be the same angle since they are concentric (almost) regular hexagons? it's just slack in the joint that's accumulating and causing the intermittent rotation.
@@kauhanen44 nope, and it's not actually the offset that's causing the 'fluctuations' but the angle of the joint. the greater the angle, the greater the effect. in the real world, a CVD (constant velocity drives) solves this by a number of ways.. one of which is by introducing another universal joint in the same space. in the lego example above, it's basically 2 (or more) universal joints every time a "turn" happens..
No. You can see them move all in perfect sync. However friction is fluctuating and therefore the motor speed does not remain constant.
also all the inks seem to be in the same state. every rod should be ofset from the precedent to mitigate the torque problem on the angle offset
you could maintain theoretically perfect 45°/135° angles and still spiral out just by changing side/shaft length. so this isn't necessarily the reason
5:00 The electromotor:”THAT’S ENOUGH SLICES!!”
For the students of vehicle engineering, the unequal velocity universal joint is really kind
Universal joints are something you have to watch on farm equipment a lot. Also driveshafts and such!
I'm not sure what I enjoyed more, the demonstration, or all of the hilarious ways the motors, gears, and other bricks popped apart under the stress! Haha! Also, once you got to 18 U-Joints on the car, the drivetrain sounded like the beat to a Johnny Cash song. Hahaha!
Unreleased Cash track: I Walk The Line of Offset Universal Joints
@@jlinkous05 I could see Weird Al Yankovic doing something with that... Haha!
Yee haw, like a gallopin stahlyun
And it only took One Piece at a Time!
7:16 *insert train horn here*
I can't explain how awesome this video is. It's literally an engineering class gone right. This is the best way to learn something complicated having fun with it without spending lots of money.
Total Mech noob here, is there a real-world purpose of this level of iteration with a Cardan Shaft, or is this just a way to demonstrate the cascading increase in offset?
@@anongentry2269 mech noob here too, but I dont think there is any feasable real world purpose of this level of iteration of universal joints, one or two at a time, maybe, even three, or four if you really want to stretch it, I can see, but 60? thats just ridiculous
@@anongentry2269 you've never driven a 4 wheel drive vehicle with completely independent suspension all the way around? Maybe a Mercedes? Or a dune buggy? They all have some/ a lot of these concepts
Wow! I had no idea that the offset thing was even a thing! I learned something new today. Thanks!
i cant even tell whats different between the offset and the not-offset XD nvm i just didnt notice it at first bc me dum btw we have the same first name :o
@@gameknight.thump1 I literally took 15 min trying to figure it out. Had to take screenshot to go back and forth and everything lol all makes sense now though
@@minidude993 can you explain it to me? I still don’t get it, the design looks the same. Offset and no offset...I feel so dumb.
@@jaredchampagne2752 Look at the middle shaft @1:11. With no offset, the C shapes on each end are both aligned.
What is it used for tho?
the sudden gear grinding at 5:40 kills me. it also sounds like a gau 8
That moment was like a jump scare for me, especially since I had my volume on almost max with headphones on.
or sudden, explosive diarrhea
Sounds like a strong, crispy fart.
@@CocoNoCo ur dad fart
@@CocoNoCo exectly
I seriously appreciate how you kept the raw audio. You actually see and hear everything as it happens, no janky ass music covering everything up lol. Great vid!
8:21 GUY: M o v e . MOTOR: But I don’t wanna! GUY: M O V E MOTOR: O-K! *MOTOR GOES SPEEEN*
5:41 that abrupt grinding noise i think is funny.
I loved the short stop motion animation at the end, great detail.
It scared the hell out of me
at 4:30 you made a very trippy optical illusion, it looks like the joints are moving outwards
Wicked effect. Looks like the whole octagon is growing in size because of the spin. Love the illusions. 3:55
These videos makes our days better
No, i won't help you reach 31k subs without any videos.
@@STA-3 savage
I would most certainly agree with you on that!
Bot
I‘m very into mechanical engineering, and i like to think that i know much about it but this is new to me somehow i never thought about this, thanks for spreading information mate!
Same! Still scratching my head and simultaneously feeling kinda stupid for not realizing this.
5:11 warthog fires its guns
Honestly this is a brilliant demonstration for how universal joints work, I’m actually studying as an engineer (focused on cars, particularly in Motorsport) and we had this explained in class but even with the animations they had I struggled to intuitively understand how exactly the fluctuations work. This demonstration finally made it click, so thank you for this excellent video!
That optical illusion @ 3:50 is amazing!
What optical illusion?
Oh, wow. Did not notice until I stared at the centre of the image for a few moments. Cool.
Oh yeah it is!
@@nagualdesign When the axles are spinning it looks like the whole structure is slowly expanding outwards
@@Scribblersys I don't see that myself but thanks for explaining.
I like how whenever it broke it went from sounding like a engine with no fuel to a full rpm v12
4:15 wild optical illusion where if you stare in the centre it looks like it's getting bigger - besides him adding more connectors ;D
I'm always impressed with the unexpected failure points. Also with how some of these setups sound like low rpm diesel engines.
3:58 Now I know how to make the chromatic scale with Legos!
4:55 My computer when I put shaders on my Minecraft world
So much respect for the time and effort that went into frame matching the transitions at the 4:40 mark.
Nobody cares tho the video is still lit
@@ArdePiertje i cared
@@ArdePiertje i cared
@@ArdePiertje I cared.
I cared
When I went to automotive mechanic school, they used a lego model similar to this to demonstrate automotive drive shafts and problems that arise with them.
I always think to myself when I watch these videos. "Surley this is close to the limit". Then I look at the timebar and it's always less then 50% of the video. You really push these lego experiments to the limit and it's awesome!
This is brilliant, I've been working on a project using these joints and so far this is the best example of how they behave!
I love that you show the issues in your device iterations. It's really healthy for upcoming engineers and programmers.
Litterally rhe best type of videos, jus straight content, no commentary, no music. love it man!
8:30 I swear this is the noise printers make
Wow great ways to demonstrate the importance of no offset! also very mesmerizing!
KZhead algorithm has never done me wrong. Happy to have found your channel! These demonstrations have so many applications outside of Legos. They get my brain thinking differently about common problems I run into at work/home/other projects. Great stuff!
I'd have been interested to see if some lubrication would have made it any easier to run those 66 U/J's? This experiment also perfectly displays the reason why cars need to have constant velocity joints in their axles and driveshafts. Can you imagine having to drive down the road with your wheel speed fluctuating like that? Lol.
Its called driving a Jeep lmao
Lubrication would definitely help. Brick Experiment Channel has occasionally added lube to some mechanical tests and it increases the RPM and helps preventing overheating/melting of the plastic parts. Some would considering adding lube cheating though since it's involves using something outside the world of Lego itself. I'd still be curious how far it could go because there is a lot of sources of friction adding up throughout this model.
There was a technic piece from the 90s that was a U joint inline with axle
Shanger!
Nice! I knew of this effect but making a chain reaction of the oscillation through the axle is great!
It's really cool how you kept matching the motor rythme while adding more joints. Such a subtle detail that seems completely effortless but isn't.
that was hypnotic. also this has to be the best demonstration of both mechanical loss and U-joint phasing. i would love to see one with Constant velocity joints.
The use of a pick to demonstrate rotation speeds is inspired!
He didn’t say it wasn’t.
@@thetubeboi6991 inspired is another word for very smart/creative
@@jacknesbitt240 kk, sorry.
Didn't expect a video so soon. Very cool!
5:10 "oh cool they changed the gear ratio, it'll probably run smoother now" *grinding noise directly from hell*
I appreciate all the editing with this build.
7:05 sooo my mind was working right when i was thinking "HEY isnt this used for differentials in cars??"
Great video as usual. I never knew the phasing of universal joints could have such an effect.
Very pleasing to see how much torque you can achieve with Lego! Every time you thought to solve the weak spot, the following weak spot appears. Very nice video!
I love the construction "time lapse" edits. Lots of work, but great results!
Imagine a GBC module that moves the balls to the center using a mechanism like this.
Man, Lego's have definitely gone from just being a child's toy, to a tool for aspiring engineers since I was a kid!!
It’s LEGO, no such thing as LEGO’S
@@sirrichardpumpaloaf8154 Lego my eggo😉
I never knew about fluctuations like this, and the guitar pick use was awesome!
It’s cool how the sound changes every time he adds something. I enjoyed observing the whole process.
Very good video. Very interesting. I have a good idea for the next video for you. What if you made a lego lathe? Maybe it could cut styrofoam or maybe even wood. It would be really neat if it had power feed and everything
I’m always amazed by how much I learn on this channel.
Nice vid, it demonstrates the oscillating motion of the shaft when you have a difference in angle from one end to another, and of course the huge loads on the bearings. that's why you can't change the drive angle with a traditional cardan shaft, just a parallel offset.
Alternate Title: Destroying More Lego Using More Lego
Clearest explantation I've ever seen (literally!) of why a universal joint is not a constant velocity joint. Subscribed.
I like how the motor with all the universal joints sounds like laughing, and it sound more demonic when more are added
A weapon to Surpass metal gear 8:44
wait... I wasnt the only one to think that this sounded like old town road right????? 6:27
Thanks for demonstrating the inherent flaw with universal joints, though I gotta admit the sputtering was strangely funny.
No obnoxious music, just the beautiful sound if Legos and Lego motors operating and being put together. I could just listen to this to fall asleep without even watching it. Idk why. Thank you for not.bombing the videos with some obnoxious music. Idk why people think you habe to employ the use of wild sounds and lights to keep attention. If your content is worth paying attention to, then I will. If you have to use sensory overload just to maintain attention, then you aren't making good content. This, this is GREAT content that is self attention grabbing. Kudos and very well done.
I went back, and forth, back and forth. Many times. I never saw a visual difference between "offset" and "no offset". What did I miss????
@@tusharxo ahhhhhh, now I see it. I was looking for a piece added or removed, or perhaps a different piece. Rather than the two ends of the middle shaft being parallel, they're perpendicular now. Thanks!
@@_g7085 That really helped, thank you!
As always, another great video! Did you consider a worm gear at the motor?
Thank you, the gear does not matter at some point, the bottleneck are the first 1-4 joints, they give
Exactly what I thought.
@@BrickTechnology Could it be better if there would be lube added to the shafts? Almost looks like a friction issue.
That poor motor is like: I canne do it Cap'n!! I don have the power!!! This was super fascinating and the guitar picks to show the offset was a great idea!
Clearly the smoothest ride ever built for comfort
4:20 why does it look like its getting bigger?
Those lego pieces went through a lot of pressure, I'm surprised none of them broke
I love it when the whole thing pulls itself apart. Such a cool video!
Staring at the center produces some cool illusions!
There is a really fascinating visual illusion effect if you watch the middle of the building and move your eyes around the joints. Looks like it all expands outwards.
I learned a lot about universal joints--thank you!
That poor LEGO man fell into the mechanisms and was lost to us. A moment of silence for their sacrifice in the name of engineering.
This must be what engines have nightmares about. Great video!
I see complicated looking lego contraptions, i click. its simple.
I love how you show the mistakes and failures, this is super awesome, learning alot
Whyyyy was this interesting as hell??? And the Lego man 4th wall break look at the end was a " HA!" moment. Well done
My man both blesses us with ASMR and cool lego builds, 2 birds 1 rock!
The initial offset explanation is exactly the reason for the cracking noises of the Technic Defender
6:15 - father please, I cannot! You ask too much of me!
5:42 that went from 0-100% violently! Also I jumped me a bit and made laugh hard.
I am so glad I watched this. I've been seeing the same fluctuation in my 42055 Bucket Wheel, now I want to go back and look at the U-Joints in the power system and see just how I have them positioned.
6:53 so thats how turtles are made
5:57 I had a physical reaction to this
very cool optical illusion for the second type of joint when it was spinning really clean, looked like it was growing
Had to stop at 6:21. This is pure soul torture 😢 😭
The car is the best part. It runs so bad, just hilarious, made me laugh my ass off. Please keep it up.
8:35 started to sound like a Harley lol
7:50 the sound of every chevy pickup truck from the early 2000's and late 90's
I am glad you dialed in your PHASING of the U-JOINTS... my OCD was going nuts before on the older videos...LOL... Well done. I enjoyed this video as well..
Bravo. The saying goes ‘You can’t teach an old dog new tricks’. You just did.
2:46 hey the car won't start!.
i never knew how much i needed a lego asmr
7:42 love how you can see the rotation move through the loop
I couldn't stop laughing at the self destruction. 😂🤣 Lego dark humour.