Why Machines That Bend Are Better 

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Compliant mechanisms have lots of advantages over traditional devices. SimpliSafe is awesome security. It's really effective, easy to use, and the price is great. Check out SimpliSafe here: simplisafe.com/veritasium
I visited the Compliant Mechanisms Research group at Brigham Young University and spoke to Professor Larry Howell:
At the above link, you can download 3D-print files to make some of the objects in the video, plus learn more about compliant mechanisms.
What I learned about compliant mechanisms I summarize in the 8 P's of compliant mechanisms:
1. Part count (reduced by having flexible parts instead of springs, hinges)
2. Productions processes (many, new, different enabled by compliant designs)
3. Price (reduced by fewer parts and different production processes)
4. Precise Motion (no backlash, less wear, friction)
5. Performance (no outgassing, doesn't require lubricant)
6. Proportions (reduced through different production processes)
7. Portability (lightweight due to simpler, reduced part count designs)
8. Predictability (devices are reliable over a long period of time)
Special thanks to Patreon supporters:
Donal Botkin, James M Nicholson, Michael Krugman, Nathan Hansen, Ron Neal, Stan Presolski, Terrance Shepherd
Animation by Alan Chamberlain









コメント数 : 10 993   
Economically 4 年 前
Weird flex but okay
oldcowbb 4 年 前
you got me
Milo Wyner
Milo Wyner 4 年 前
This is an underrated comment
C7 Aero Space
C7 Aero Space 4 年 前
When you make the joke first but someone 5 days later makes the same joke and gets all the attention.
Markbadas 3 年 前
Das Life
sean roland
sean roland 3 年 前
oh man this is gold and so few people even realize it!
m box
m box 2 年 前
As a former student of mechanical engineering I feel like this is the real business. 3D printing is a pretty cool addition to the toolbox but going back and rethinking linkage mechanisms in this way feels way, way more exciting and fruitful to me.
The Villain in Glasses
Old comment, yes, but still wanted to mention you should check out the origami engineering video Derek did with this same guy, Larry Howell. Basically, they talk about taking compliant engineering to the next level using the power of folding.
Phillipe Janvier
Everything needs to be looked at again
Laurent Beaulieu
That is what is brilliant with 3d printing. Gives access to engineering and prototyping to the masses. Never been more easy.
Truth Holder
Truth Holder 年 前
Agreed. I think of my days at M-K Engineers (decades ago). This would have changed how we designed things.
Shamino Ranger
Shamino Ranger 2 年 前
Professor Howell: "Here's my book, it's the most cited book in the field." He's flexing.
Zombe 2 年 前
Jesus loves you:)
GlizzyMonger 2 年 前
You mean bending?
Lunamann 2 年 前
>He's flexing. Get out. Get out with that pun.
Dioptre 2 年 前
here you go take the 400th like
milinski 年 前
I work in an R&D lab of a Swiss watchmaking company, and I can tell you that compliant mechanisms are currently by far the hottest topic in research for mechanical watches. For example, they're used in the form of microfabricated oscillatorsmade of Silicon in the Frederique Constant Monolithic and the Zenith Defy Lab.
J W 年 前
You should do a video. I personally would love to see how you are using this kind of thing in watches.
Alex Flores
Alex Flores 年 前
@J W yes completely agree, I just revisited this video and mechanical watches came to mind; didn't know that compliant mechanisms were in the map for watchmaking, would be nice to see how.
One question I had while watching the video was : "How does it react to heat variation ?" I would say this one is especially relevant for mechanical watches applications
TiyLum 年 前
Awesome but when am I going to get flexable phone
G 年 前
Flexible parts sound like a nightmare for longevity and accuracy. As a watch dude, you already know the lengths they go to minimize backlash and friction. Ruby bearings and escapement, precision machined everything. I could see flexible parts being used as part of a complication, but never towards the heart of the watch
Piesho Nais
Piesho Nais 2 年 前
11:27 "So are these now being used on nuclear weapons?" "You know, it turns out they don't tell us" Now I know how to take my resume to the next level.
Notatheist 年 前
I’m laughing. I’m laughing as I add a few fascinating lines to my resume.
Robert Cerat
Robert Cerat 年 前
They don't tell them??!! Hmmm! NASA just pays them millions $ for the patent?
Mangaka2004 年 前
@Robert Cerat I'd suppose that the designs that were kept got some amount of money or whatever else they could give out and then you don't hear from it in any way shape or form until you see them put up an ad or something asking for a new design. I'm mostly curious of what kind of amount they got for their different designs.
Hermi 1-kenobi
i dont get it TvT
Nunezification 2 年 前
The clutch is actually a centrifugal clutch, exactly like the ones in the chainsaw, but the one in chainsaw have 2 or 3 springs, and those springs break all the time. So these parts would be much more efficient since they’re made out of one piece. Nice!
David Gutierrez
Those springs means it is easy and cheap to replace. If it's all one piece, you will have to throw it all away for a single failure. Anybody who has used bending plastic hinges knows that absolutely suck. Ask any guy who regularly uses toolboxes. The good stuff has metal hinges.
Leonard Zuniga
​@David Gutierrez Good thing that the design isn't actually meant to be used for plastics, but metals, am I right? The plastic shown is only for demonstration purposes.
TrustMe IamTroll
Centrifugal clutches has inner shoes made out of friction material for reason: steel shoes and steel drum I suspect would have nice sparks flying all over...
Kevin 年 前
@David Gutierrez 1: injection molded plastic toolboxes use different plastics than this and arent stress tested for over a million uses by firms dedicated to compliant mechanisms 2: he literally showed a metal one right after saying "this ones plastic so its just a model" 3: its a single, relatively small, extruded piece of metal, they showed a picture of it installed on a chainsaw and its just smacked on the outside, itd be the cheapest and easiest thing and to replace it you literally replace exactly one piece of metal, instead of buying and replacing multiple components.
Kevin 年 前
@TrustMe IamTroll they never said the centrifugal clutch gets installed with just bare steel as a friction surface
Physics Girl
Physics Girl 4 年 前
Such a good vid. You don’t get a sense for how they feel from the video. That’s the only disappointment. Why no haptics, Derek??
Jloc 4 年 前
JPvid doesn't support it yet. I don't know why; everyone has been asking for it since 2030...
adcurtin 4 年 前
I started printing the bistable switch as soon as he mentioned a link to the files, before the video even finished. I'll have haptics soon enough :D edit: just got it off the printer. holy crap it's incredibly satisfying!
TheOg 4 年 前
Yall should date. Or we should date. Either/or
Literary Landslide
@TheOg You know Derek is married.
GrummanPilot99 4 年 前
@Literary Landslide hmm I thought for a second there they were totally hooking up. Oh well. Would be one smart kid though...
Joe 2 年 前
I used a chainsaw quite a bit and let me tell you I would've been saved a few headaches if the clutch had been a single compliant mechanism instead of the mess of metal and springs that it is. That is an amazing practical application for this.
HOLYbots 年 前
Ain't that the truth!!
Quesadilla 年 前
@HOLYbots joe
HOLYbots 年 前
@Quesadilla wdym joe
Quesadilla 年 前
karotto 年 前
This is amazing. As a mechanical engineering student, we are learning all the ways to prevent bending and shear, whilst you guys are taking advantage of it to make advanced mechanisms.
Lepi Doptera
Lepi Doptera 年 前
That's because the headline is not even true. If you are trying to design a CNC router, then bending is to be avoided at almost all cost, otherwise your machine will only do three things: 1) destroy your workpiece, 2) destroy your tools and 3) destroy itself. If you don't understand why, then you still have a lot to learn, "mechanical engineering student". Engineers who are designing bridges and railways and pipelines, however, have learned centuries ago that compliance against thermal stress, etc. is absolutely required to prevent failure. You just don't know what you don't know.
Farrel Rafi
Farrel Rafi 年 前
@Lepi Doptera I mean just because he compare "preventing bending" to a compliant machines, doesn't mean he is all wrong tho.
Lepi Doptera
Lepi Doptera 年 前
@Farrel Rafi Most machine tools are made for highly rigid tooling processes. If the tool is allowed to move in the direction in which it "bites", then we get a destructive positive mechanical feedback where the machine gets deflected ever farther into the wrong direction. The way to counteract that is with rigidity and mass. "Soft" machining can be done, of course and it's highly useful. That's how optical manufacturing processes work, for instance. Grinding and polishing can produce near atomic precision with machines that are all but precise and are completely floppy at the scale of the final precision. I find that absolutely fascinating in its own right. A stone mason is, if you want, also a "soft manufacturing process". He constantly compares the shape of the stone he has with the shape he wants. The tradeoff is time... soft processes take much longer than a rigid process. So yeah, there are plenty of applications, but one has to chose wisely.
Dhruv Pandya
Dhruv Pandya 年 前
@Lepi Doptera I do not have any type of engineering education, but from what I remember in high school physics, is the use of compound material in things like bows for their compactness and good force multiplying. It depends on the use case. I remember we had tent-like structures on our school fields for shade. One was made by hollow steel pipes, one was made by the bamboo and ropes (very common in my country), when a sudden stronm hit. The steel pipe tent did not suffer damage, but was blown away and the joints suffered damage. The bamboo tent swayed a lit bit, but did not collapse. The bamboo itself suffered no noticeable damage. My teacher had a thing about teaching us things after whatever failed after torrential storms (common in my area) and, he loved to point out all the coconut trees still standings, compared to some of the some thick sturdy trees uprooted or damaged.
Sinan Sarikaya
@Lepi Doptera Really? Manufacturing is your only concern with this? You cannot build anything that spins with bending mechanisms. This already rules out anything from Turbines and Pumps up to wheels and power tools. Compliant mechanisms certainly have their place but they won't replace as much as people like to believe.
Jhin ヶ月 前
Larry is like literally a clone of my uncle and my grandfather. All engineers, same gestures same glasses the same clothes same hair
AdamosDad 2 年 前
Before I retired in 2009, I was talking with an associate in our testing lab that had worked on the safety and arming mechanisms on a particular nuke, in the conversation I asked about the high order of electronics that must be in those devices, to the contrary he said very simple mechanics and simple electric devices are used to keep reliability high.
Pc Farmer
Pc Farmer 2 ヶ月 前
The fact that they physically have to interact with it on a microscopic level for it to work is amazing
Real Engineering
My new favourite video from you Derek!
chase fawcett
chase fawcett 4 年 前
Can't wait
Ritvik Vaishnav
Ritvik Vaishnav 4 年 前
God, real engineering is *av*rywhere these days!
Gilang 4 年 前
please make it, this is about how to reduse usage of material (which is reduse waste too)
Giap Chin
Giap Chin 4 年 前
Real Engineering, would you please make a video on the topic?
FalconEagle 4 年 前
mine too
Anders Andersson
How cool is that! Actually most materials recover very fast from bending force, where you don't have fatigue or plastic deformation involved. The trick is to design for instance a tool where you can control the direction of the forces involved. If the tool is used as it supposed to be used it can almost last forever. Design and control the forces to work in the right direction and then make sure the design is used correctly. Nice...
DragonBuilds 2 年 前
I could totally see the plastic vise grips being used as some sort of pliers suitable for cleanroom use
soolly 357
soolly 357 年 前
That's actually a pretty good idea. I use to work in a cleanroom & use tools like this. We use to get new ones every 5 months or so due to rust from IPA cleaning.
TheRealXesc 年 前
Hah! When I read this, I totally expected the sentence to end with "... sort of pliers suitable for torture use"
soolly 357
soolly 357 年 前
@TheRealXesc lol you'll see them at your dentist
Stein Anderson
they weren't vice grips, they didn't lock, it was really poor comparison, they are just plastic pliers
Corey Dalton
Corey Dalton 年 前
@Stein Anderson thank you
The Dude
The Dude 5 ヶ月 前
Always great when you can use Veritasium as a source in essays and stuff. Doing a 1st year eng research essay on the possible application of Compliant mechanisms in landing gear for spacecraft. (due in 3 hours as of writing this[almost done]) It is so nice to be able to watch a video and then understand(at least a vague understanding) of what all the papers I'm reading are actually saying. Edit: got an extension, now I can expand my conclusion paragraph
lunarluxe ヶ月 前
hope it went well
Mohammed Jasim
Mohammed Jasim 2 年 前
This man-made me to change my major from biochemistry to engineering. I just want to thank you for your inspirational video that kept me going to do things I love everyday.
Random person
How's engineering going?
Doctor Jones
Doctor Jones 4 年 前
The thruster control module was probably the coolest thing I've seen all year.
Doctor Jones
Doctor Jones 4 年 前
ludwig amadeus _mEmEs_
Ishiku_542561_aka_xchoibitschibi hil
@ Doctor Jones ....that thing is out of this world !
Vipera74 3 年 前
Doctor Jones and I need its name
Comp Nethry
Comp Nethry 3 年 前
yeah that module was the only useful application seen in this video
aeris171 3 年 前
yep, we are seeing the future
Warded Thorn
Warded Thorn 2 年 前
I love how he genuinely just loves his mechanisms, he looks like a kid with his favorite toy. The best way to be.
Manny Khosbin
Manny Khosbin 2 年 前
Puts pipe in duct tape hole. The algorithm: demonetized
anom 2 年 前
Why shouldn't he? Of course he is.
blackvalley007 2 年 前
Another key factor for the increase in precision besides the elimination of play (backlash) is due to friction being almost eliminated. This eliminates hysteris, also known as virtual play. The precision error of a mechanism is the sum of its play and the virtual play components. I think that including some simple force/distance diagrams would have helped alot for understanding these concepts.
Steben Elle
Steben Elle 年 前
This is pretty cool, makes sense for some applications. My major concern would be stress and fatigue issues, of which they are obviously aware, and for which they have done some testing.
Luiz Santiago
Luiz Santiago 2 年 前
Muito obrigado! Excelente vídeo, e agradeço também por estar disponível com legendas em português...
TamirD 年 前
Thanks to incredible people such as Professor Howell we as a species can evolve and get better. Science is amazing
ThatMCGamer 4 年 前
That man was such good sport. Very open with how it works. I personally thank him for being on this episode
null 4 年 前
I loved that even though he knows everything about it, he was still super excited to show it off and still thought it was cool
Ian Honour
Ian Honour 4 年 前
I'm sure he's buzzing about your thanks buddy!
Sou Sou
Sou Sou 4 年 前
Swapnil Sinha اة
Trevor Lindgren
Trevor Lindgren 4 年 前
He is a friend of mine and a good man. Great episode!
I love this guy, he's so nonchalant about mind bending engineering feats.
Andi Arbeit
Andi Arbeit 2 年 前
I see what you did there, word bender..
SEA 年 前
Saw this comment right as the dude in the video said this
Laurent Beaulieu
That could be great in aerospace. Imagine a wing with adaptive flaps that just give you more lift at lower speed through movement by the speed itself.
Riain Rising
Riain Rising 年 前
Amazingly efficient and impressive. The possibilities at the quantum level have suddenly come into perspective. Good video!
AnonymousSurfer 2 ヶ月 前
I wonder how amazing yet simple those things are! How come anybody couldn't figure this out before?
Sir_squonks_alot_ Castro
This guy and his work should be in school books! He is the definition of thinking outside the box.
grovermatic 3 年 前
Please, just pause for a moment and reflect on the fact that the phrase "3D-printed titanium" is, in fact, an ACTUAL THING. That is freakin' awesome... what a time to be alive!
Johnny Espalahento
Johnny Espalahento
Eliphas 『Over Heaven』 lame
grovermatic 3 年 前
@Johnny Espalahento Yes
Johnny Espalahento
@grovermatic cool
Belal Abu Sultan
ok I want to ask this now.... can we make Damascus titanium like we make Damascus Steel ? if so, how much would it cost for Damascus titanium Katana sword with Tesla's picture engraved on it ? this does sound like something every Internet Nerd would love.
Anton Strandberg
This is absolutely amazing! Thank you for bringing this to our attention!
Anthony Carbone
I agree with similar comments that this topic intrigued me like no other. It is almost like modeling an exoskeleton but in a future modernistic manner. This seems like future tech that is so cool that it has come back in time for us mere mortals to marvel over.
Lachlan Parker
Lachlan Parker 7 ヶ月 前
I was mind blown by the first titanium hinge. My jaw legitimately dropped, and I’ve only done that 3 times before in my 21 years of life.
keld101 2 年 前
Pretty cool. I would have liked to hear about it's limitations right now as well.
mjbailey404 2 年 前
Smaller part count is potentially useful for manufacturing but for longevity it would mean having to replace the entire thing after any operational failure
Kevin Street
Kevin Street 4 年 前
That thruster control for the satellite is a thing of beauty. I'd love to see an animation of how it works!
11kele 4 年 前
You can see it in work at 8:50 really awesome, two motors, any direction.
Hafidh Zuhdi
Hafidh Zuhdi 4 年 前
ikr, like human joint. there must be a reason why human joint isn't designed like that...
Kevin Street
Kevin Street 4 年 前
MiniNinja 4 年 前
Tera T
Tera T 2 年 前
It would be amazing if they made a Compliant mechanisms for slingshots or cross bows.
drange08 2 年 前
This should be part of every mechanical engineering education.
Chinmay Limaye
I really loved the idea of these machines and this type of mechanisms seriously need to be used more...thank you for the enlightenment.
infiniti649 2 年 前
Why can't we have professors like Dr. Larry Howell? Life sucks
xaracrocker 年 前
I would have loved him as a professor! If I had the opportunity to switch to compliant mechanisms for my speciality, I definitely would.
CybranM 4 年 前
This is honestly one of, if not the best video you've made. Was great to learn so much about a topic I didn't even know existed.
Corkoth55 4 年 前
couldn't say it better
ethan johnson
ethan johnson 4 年 前
I tried to say the same but with different words
antagonizerr 4 年 前
Well, he never calls them what they are, which are 'living hinges'. Living hinges are unreliable because they fail unpredictably. Could last 10 years, or just a day. Very impractical for high assurance machines.
Binaya Shrestha
Binaya Shrestha 4 年 前
Indeed, it is the best one.
Zack Scott
Zack Scott 4 年 前
I agree completely. You totally scored meeting that guy at one of your talks. I want to see literally every compliant system he's ever done lol.
Tom Karren
Tom Karren 2 年 前
My dad was a professor at BYU. We lived in a neighborhood that had a lot of engineers and scientists that were notable but humble like this guy. It’s one of the reasons I went to BYU.
Maple Glass Printing
Maple Glass Printing 11 ヶ月 前
Love the use of compliant mechanisms! Great work guys, soon we will 3D print a glass compliant mechanism :O
Jeffery Barnett
Jeffery Barnett 5 ヶ月 前
The extrusion process sounds very cheap for some parts. I'm very impressed. I've worked with a few items made like this and I had concerns about the part wearing out prematurely. However, my concerns have been eliminated. The once-piece clutch was very nice.
Ahmad Chuzgapa
The only thing I'm concerned with is the breakage due to fatigue in the 'bendy' zones. If that is not a problem then I'm sold on the idea.
Arsalan Afrakhteh
Arsalan Afrakhteh 3 ヶ月 前
This is crazy good. Opens the door for my brain to think of many cool mechanisms that I did not think of before. Really awesome. Thank you so much!
Taikamuna 4 年 前
_Any machine is flexible if you're just strong enough_
Rusu Rares
Rusu Rares 4 年 前
Taikamuna back at it again
Sreenikethan I
Sreenikethan I 4 年 前
Taikamuna back at it again
Illusion466 4 年 前
What if it's a very brittle machine?
Maxawe Some
Maxawe Some 4 年 前
@Illusion466 you just stare at it strongly, until it bends to your will.
b k
b k 4 年 前
Not quite. There are fragility and strongness. Some materials can simply break up.
StayChaotic 年 前
You, your team, and all the people that you feature are so very talented. thank you for sharing as always brother
William Federbusch
Love that you and PhysicsGirl are friends! Also super proud of myself when, while watching Harry Potter, I realized what Veritasium means! Love this channel. Keep up the amazing work. I teach STEAM in elementary and my students benefit from my learning from you.
David Myers
David Myers 年 前
Professor Howell's patents must be quite lucrative to BYU. This video could have been 3 hours long and kept me engaged.
R1 Marine
R1 Marine 2 年 前
very cool. I would be interested in knowing more on the life cycle of the micro switches. Silicon!? Bet they are great at static, interested in knowing how to combat hi-Vibe!
C.H. 年 前
My professor made a lot of components for electrical devices... feeling lucky to be learning with him! Mechanics of Materials
ACB IXI 2 年 前
"you would scream in pain " *puts his finger and then scream * they don't call him a scientist for nothing bud
tom. calico
tom. calico 2 年 前
they don't call him a scientist at all, they call him a mechanical engineer lol.
just another fish in bikini bottom
@anom i think it's because he wanted to know *how fast* it'll hurt and not if it will work because obviously if u apply continuous force on anything, you'll eventually get hurt
@anom sure....hope you're day is nice now :3
Box Lane Productions
Trust and verify
Jonathan Garza
@anom hope everything is better now
Yoda Man
Yoda Man 2 年 前
"machines that bend are better" Bender: "shut up baby, i know it."
Murat Özcan
Murat Özcan 2 年 前
Bender Bender Bender! Bender Bender Bender! jpvid.net/video/%E3%83%93%E3%83%87%E3%82%AA-y6c5ojxYEq4.html
Nobrains Noheadache
@Murat Özcan Damn I miss that show
Mark W
Mark W 2 年 前
@Nobrains Noheadache I know.
krzysiu.net 2 年 前
@Nobrains Noheadache original cast recorded audio episode some time ago. Kind of meh, but better than nothing.
SurgicalStriker 2 年 前
"You can't bend a wooden door!" "Shhh! You know it and I know it, but this door looks pretty dumb"
Mark Le
Mark Le 6 ヶ月 前
This is so cool. Compliant mechanisms really take advantage of the elastic deformation in materials.
Paul Palmer
Paul Palmer 8 ヶ月 前
In 1968 I did research to try to put a machine, a molecular beam, on a glass slide, that could then be rotated to get three way velocity specification. The microchip etching needed had not yet been invented (I tried to use asphalt and HF). But there were mechanical components too. These kind of etchable devices could serve for controls. So far as I know, the device has never been made or researched. Maybe it's time to try again using these advanced mechanisms.
Bob Adkins
Bob Adkins 2 年 前
I have a pet peeve with battery compartment covers on remotes and other small battery powered devices. They can be hard to operate and quickly fail. My favorite is a compliant U-shape latch that always works easily and never fails!
James Last
James Last 2 ヶ月 前
This is awesome! The implications for chip tech are huge. Well actually huge for everything.
The Lead Pill
The Lead Pill 4 年 前
A video about 3D printable nanomachines is, somehow, focused on nuclear weapons and sponsored by home security. It's both exciting and very terrifying.
Michael T
Michael T 4 年 前
Icenri Nanomachines?
Flying Skyward
Flying Skyward 4 年 前
With our 12 megaton home security system, burglars will never target your home again
Baba Semka
Baba Semka 4 年 前
There's always a conspiracy.
Illuminati confirmed √
Koteal 4 年 前
I'd say the nuclear weapons are the hook more so than the focus
Adityachk2002 2 年 前
The professor is so humble , i like it
Kapten-N 2 年 前
"Here's my book, it's the most cited book in the field." I'm not so sure about that. XD
MARP00N 2 年 前
@Kapten-N a narcissist complimenting a narcissist lol
Blake Elzinga
Blake Elzinga 2 年 前
I go to byu. he's a great guy.
Bafftubz10 年 前
I legit used to think of this concept and was wondering if there was an actual term for it and now I've come across this video.
Peter Bourdelle
Centrifugal Clutch on my old go cart (driven wheel) had a cylindrical aluminum housing. Driving through the woods one day, caught a branch in the chain sprocket. I surmised turning the wheel in reverse could free it, but more leverage if I could spin the clutch body & sprocket to release the branch. My bare thumb & fore-finger slid off the clutch housing with a sizzle, so fast that it didn’t hurt, but the white char endured for a while (no scar remained), but lesson learned.
bqgin 2 年 前
I had two garlic mincers in my life. One was not bendable metal that my mother bought in 1978 and one was a bendable plastic one I got in 2012. I still use my sturdy metal mincer that is older than me because the plastic one broke within 5 days.
Martin Wright
Martin Wright 8 ヶ月 前
In the military we use a lot of carbiners [sic] and S clips and about 2007 they changed from using springs to bendy part to be a piece of steel with offset connection to the solid bit.
Ryan Romero
Ryan Romero 4 年 前
Dr. Howell is an amazing Professor and a great guy. I was lucky enough to take his compliant mechanisms class. I'd highly recommend reading his book and learning about how to design compliant mechanisms using pseudo-rigid-body models. That's when your mind will really be blown! To think that we can take complex mechanical systems and make them compliant using a simple formula is what is really quite amazing. Great video!
犬走椛 4 年 前
Complaint mechanisms sounds more like a government employee training program (yes I know it was a typo, but this is the internet, one does not simply walk by an interesting typo).
Carlosmp20 4 年 前
@犬走椛 lol
Barbara Houk
Barbara Houk 4 年 前
@Ryan I spent years in schooling and most of that time, I was self taught and extremely inventive getting around the stupidity of so-called teachers. However, a rare handful in my 28 yrs of formal education I met educators such as this man. They were inspiring and could clearly explain their subject(s). I am truly happy for you that you too have had the pleasure of experiencing learning from someone who enjoys investigating, discovering, inventing, creating and learning and then sharing all of this with others.
MrDrProfBada55 4 年 前
F.A.C.T. is where it's at
Farzad Misaghi
Farzad Misaghi 2 年 前
Really cool! The metals have an initial elastic deformation, which allows them to revert back to their original shape. As long as the devices printed do not go into plastic deformation, it would work really well for a very long time. So brittle materials like glass and ceramics become extremely difficult to work with in these applications. Thanks for the video.
Austin Christenson
Austin Christenson 4 ヶ月 前
Brittle materials also have thos initial elastic deformation, they just fail catastrophically when you go past this region. We use silicon and glass all the time in compliance you just have to stay in the elastic area.
yoashuain1 年 前
Very cool and inspiring. Time to get to the CAD and make something amazing.🤖
TimeHunter 11 ヶ月 前
That clutch design could improve so many designs. One part that can be swapped instead of annoying mechanisms would save time and money!
zJoriz 年 前
I've seen plastic mesh tires that seem to benefit from this principle. Next step, of course, would be similar suspenison... If you can control to such a degree what movements are allowed, this could save a lot of weight.
Dark Lusare
Dark Lusare 年 前
This really calls for much respect for this research group and Professor
Karthik C
Karthik C 4 年 前
Practical examples of use of compliant mechanisms in everyday products 1. Every shampoo bottle uses a live hinge made by injection molding - very cheap, durable and assembly free. 2. Computer mouse buttons use flexures (those bendy things you see throughout the video). The microswitch inside it has a diaphragm flexure and the top casing flexes when you press on it to transmit the compressive force. Older mouse models had separate distinguishable buttons, now its all one piece. 3. Cable ties have a very small tooth with a flexure that engages a rack. You can often reuse cable ties by disengaging the tooth from the rack using a pin and pull out the rack while holding tooth off the rack with the pin. 4. All plastic components of every product you use has a snap fit for assembly - no requirement of fasteners. 5. Every book uses live hinges (crease where you bend) for opening and closing. 6. Some cheap click type ball point pen (e.g. Bic retractable pen) uses flexures to keep the extended pen nib in its position. 7. Tic tac box uses living hinge for the lid. 8. Volume rockers on your cell phone uses flexures instead of springs to bounce back 9. If you have a wind up pendulum clock, the pendulum is suspended by a flexure for avoiding friction caused by use of a pivot. 10. Snap fit locks for straps in duffle bags/backpacks etc. 11. Some shot microphone mounts uses flexures for vibration isolation. 12. Camera lens covers uses flexures for springs for holding the cover on the lens. 13. Disposable food containers, clamps for IV lines. 14. Paper clips. 15. Foldable plastic forks found in ready to eat noodles have a living hinge in the middle for folding. 16. Leaf springs in vehicle suspension (Thanks to Heartycoffee in the comments for suggestion). 17. Tweezers and forceps (Thanks to randal gibbons in the comments for suggestion) 18. Safety pins (Thanks to DrBrainSol in the comments for suggestion) 19. Accordion-style toilet plunger (Thanks to Gary Young in the comments for suggestion) p.s. I will add more to the list later. I love flexures and thank Derek for making a video on compliant mechanisms with Dr.Howell
skullee 4 年 前
Haha I was thinking to myself "if compliant designs are so good, why aren't they used everywhere?". Turns out they *are* used everywhere and I'm just unobservant :)
Karthik C
Karthik C 4 年 前
@skullee Yes They are omnipresent. They are most widely used in disposable food containers to single use clamps used in IV lines. Please keep a close eye on everyday objects and you are bound to find them everywhere!
Pebbles 4 年 前
Yes and many are crappy with the flexible hinges easily overstressed thus failing and breaking off.
Karthik C
Karthik C 4 年 前
@Pebbles Yes certain consumer products do have badly designed living hinges and I have had similar experience. However, a properly designed living hinge should last thousands of cycles if not more. They would fail prematurely if they are not designed properly, use of wrong type of plastic, if they are bent over their design limit/excessive force, if they are subject to extreme heat, or if they are subject to UV light(sunlight). Please do not get me wrong. I use them all the time. If you design, use them properly they are shown to last at least a million cycle as the Professor in the video claims. Even a 3D printed flexure lasts hundreds of cycles for me when I use them in my lab for my experimental setups. Often times they simplify design with no assembly required. They are indispensable in applications where you cannot use lubricants. for e.g. MEMS, certain medical devices.
Pebbles 4 年 前
Many are not properly designed and having machines cyclically repeating the same action does not emulate real life where there are substantial differences, variances and exposure to idiots. (No one can engineer against stupidity). I have a car window switch that comprises of the simplest possible machine essentially being just a rod of flexible plastic that pushes onto a copper leaf switch. Just with normal use the end shortens being unable to make the copper leaves to make contact. The biggest problem is that the replacement price of that switch is about $250. In the same vehicle there is a plastic combination stalk mechanism (its second) that now fails to invoke the fast wiper speed unless one deliberately over twists the switch and holds it there. The price for that is about $600. The original plastic combination stalk mechanism failed by not being able to invoke high beam. It's amazing that something that costs cents to make can cost so much as replacement parts. What I find most amazing is how pressed metal sheeting can outperform solid cast metal structural components.
Geetik Mamillapalli
I was thinking of making something similar to the NASA thruster joint shown here as my final Engg. Paper even though I'm a second year Mech. Student but this inspired me alot . Thanks Alot ❤️
Rajkaushik Borgohain
Normal people : Any machine is flexible if you are strong enough. Engineers: Any machine is flexible if you are smart enough.
loop 年 前
Amazing video! I love the innovations insanely smart people come up with!!
Harris Axer
Harris Axer 2 年 前
Of all your videos this has me perplexed the most. Funny thing, back in my university days studying engineering, compliance’s where everyone’s enemy of precision. Even worse, bending components like the one you show were a BIG no-no because of premature failure due to material fatigue. To further the point,knuckles and joints are the preferred way of nature (look at animal kinematic). To say that this actually works is a very bold thing.
b_a_ hoonigan
You sometimes feel things like these were already made… I had this in mind years ago how the centrifugal force could be used in a clutch and turns out, it wasn’t really being used until now. The problem with new ideas is, you do not know if they are already being researched upon or not… So simple yet so sophisticated.. its so cool to watch such innovations!
Jan Samohýl
Jan Samohýl 4 年 前
This is mind-bending, but luckily, my mind is flexible and compliant.
Aravindhan Veeramani
No pun intended
I wish my wife was...
ɣ Δ
ɣ Δ 4 年 前
@CunningLinguist01 Maybe you're not quite as skilled a "CunningLinguist" as you claim to be. ;)
DesertDog 4 年 前
But he could be a master debator
ɣ Δ
ɣ Δ 4 年 前
Yue Yu No, that's not what I meant, also I was joking. :)
René Christensen
I used the mechanism shown at 6 minutes in to make a patent application in my former company. We printed this particular geometry from the video to show off the principle.
DBKarman 2 ヶ月 前
seeing Diana made me want to cry, shes in such a hard place right now and just seeing her being so happy makes you realise how unfair this world is
Stephen Bridges
Stephen Bridges 2 年 前
FASCINATING! In slow motion some of these components are still deceptively clever. Modeling the 'snap' point of such materials must be complicated, to the point that trying different materials, widths, and angles are no doubt exhaustively checked during prototyping.
lol wut
lol wut 2 年 前
very cool. informative and entertaining. but what im most impressed with is how easily you can keep a clean shot/frame without looking.
Alex 年 前
The Thrusters titanium inputs look fairly similar to the same mechanism that controls the joysticks on remote controllers!
Khason01 4 年 前
8 P's 1.) Part Count (Less) 2:42 2.) Production Processes (Various) 3:28 3.) Price (Inexpensive) 3:33 4.) Precise Motion (no backlash) 5:21 5.) Performance (no backlash) 5:38 6.) Proportions (smaller) 7:18 7.) Portable (lightweight, space application) 7:33 8.) Predictability (safing & arming WMDs) 10:17 in case you missed them :)
hawkbird 4 年 前
i was thinking how you were gonna put size in there and in my head instantly thought "Psize"
you2tooyou2too 4 年 前
also Packable, Passive, & Pleasant (clicking)
Ginko 4 年 前
less parts => it`s harder to fix it if it breaks somehow
Pete S
Pete S 4 年 前
@Ginko Less parts to replace, you replace the whole unit.
EPiKDJ 4 年 前
glad I only saw the ad and not the video
Ralph Zoontjens
Ralph Zoontjens 2 年 前
Unmentioned but this seems perfect for robotics too, as an intermezzo step towards the so very complicated tensegrity-type tendon-based musculoskeletal systems.
Liquescent Adventures
my grandfather worked for Boeing in Seattle as an engineer and was then invited to work at NASA from early 1960's until his retired, he would love this channel!
watcherofthingsthatRkek Anonëĺmőose
Also known as living hinges or built to fail devices for mass production, however in some situations they are a great solution
Ecclesia 10 ヶ月 前
Imagine letting AI experiment on compliant mechanisms and the infinite possibilities we have not thought of yet. Once we let AI run our world (this will happen in a matter of 50-100 years btw), it will accelerate humanity to levels beyond our imagination.
Aeldrynn 年 前
I had a complain mechanism class last year during my Bachelor in Microtechnic at EPFL, and I loved it!
Brian Muhia
Brian Muhia 4 年 前
I am stunned by this level of mechanical and dynamical precision.
Paddy.R.L 4 年 前
Same, when it showed the microscopic stuff I genuinely went 😮
Demetra Economou
Brian Muhia R/iamverysmart
Fran Soto
Fran Soto 4 年 前
Person: *says something relevant and appropriate to the subject of the video that does not over exaggerate, doesn't try to make himself look smart, and is not calling anyone dumber for not understanding, simply marveling at this awesome technology" Dementra: R\iAmStuUpiD
Steve Case
Steve Case 2 年 前
I am not an engineer, but I have dealt with them, and Larry Howell fits the stereotype perfectly. Dilbert comes to mind.
YouTube sucks S
YouTube sucks S 2 年 前
Respect to this professor
Fritze 年 前
the mechanism at 10:44 reminds me of the way a bulova accutron works (analog to a balance spring.).there is a tuning fork which vibrates with 360Hz. this is transformed to a gear with 300 teeth and makes it turn 1,2 times per second as a time base. you can hear the watch humming with that frequency.
Celia YAHCCS 2 年 前
More fascinating machines. Even some that just make peculiar sounds but I couldn't see what their function was apart from that. Perhaps this could lead to inventing new kinds of musical instruments or at least different percussion or sound effects !
The Odd Plebs
i would want a more detail of this. this seems quite interesting
dayvie NK
dayvie NK 3 年 前
That prof looks so humble. All engineering profs should be this cool.
craig peel
craig peel 3 年 前
I used to live next door to one of the other professors in that program and he never really talked about what they do there, they just seem to like to move along and do another project.
Barney Lund
Barney Lund 3 年 前
@craig peel I, too, live next to one of his ME colleagues, and he's one of the most humble people I know.
Rick Meeker
Rick Meeker 3 年 前
He's a Latter-day Saint (mormon). Of course he's humble. Imagine the world like this.
@Rick Meeker being Mormon absolutely does not make you a humble person. I've lived in SLC, and some of the nastiest, most judgemental people I've ever met were Mormons from there.
Rick Meeker
Rick Meeker 3 年 前
@siciliandefense21 Ahh, true that! Sorry, I didn't mean to imply anything other than HIM. Though I don't know him personally, he seems a decent fellow... better than me. Cheers!
1994 Honda Civic GLi
another advantage is that because there are less moving parts they’re more reliable
FullnMellow 2 年 前
I find it really hard to believe that those tiny plastic parts (the parts in the demo models that actually bend) are more stable and longer lasting than a traditional bearing + axle. All plastic stuff I know of that was tried to replace "expensive" metal hinges/bearings broke after short time. And how about metal fatigue (don't know the proper word - it is the phenomenom that metal that is bent frequently changes its inner structure and becomes sort of brittle and weakens over time) - isn't this effect setting in faster than when using traditional (again) bearing + axle?
Robert Ginsburg
Absolutely love it. The medical applications will be tremendous.
Johan Rosenberg
Johan Rosenberg 2 年 前
It looks cool, but I'm not entirely certain about the benefits. For one there's a big difference in replacing a single standardized nut or a whole unique mechanism. Another point would be the strength of those flexible parts under unexpected loads. But I expect the ones in charge of product design to take such factors into account at least to some extent.