Why Machines That Bend Are Better

  • Published on:  3/12/2019
  • 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: https://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


  • CybranM (Mar 12, 2019)

    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.

  • Sameer Kamath (2 days ago)

    Totally agree. I love this video and keep coming back to it

  • uncletigger (May 11, 2019)

    Agreed. Keep us learning. The funny thing is, I recently ( last year or so ) took my Stil chainsaw right apart, right down to the least little bit, because I spilt some wood-treatment on it, stuff that was slightly acidic.And I SAW the little clutch plate and bell device in passing, I knew it was working as a clutch, as the motive force transfer, but I didn't look closely at it, I did notice the lines cut in it, but only because I was washing each part in turps, with a paint-brush, to clean it.I ...

  • Thomas Neal (4 days ago)

    "Why Machines That Bend Are Better"written by Bender B Rodriguez

  • joseph dragojevich (14 hours ago)

    +Brandon LaBianco idk maybe cause this isnt reddit lmao

  • Tit Cheese (4 days ago)

    +Brandon LaBianco ik same!!!!🙊

  • Jan Samohýl (Mar 28, 2019)

    This is mind-bending, but luckily, my mind is flexible and compliant.

  • CunningLinguist01 (1 day ago)

    I wish my wife was...

  • Criptufu Pantalones (Apr 25, 2019)

    Physics: If you fold a material enough times, it will weaken the structural integrity of the object.Samsung: We present u the galaxy fold

  • mfk12340 (6 hours ago)

    Not all materials work harden.

  • Perplexion (12 hours ago)

    Physics: Am I a joke to you?

  • Karthik C (Apr 14, 2019)

    Practical examples of use of compliant mechanisms in everyday products1. 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...

  • Tanmay Garg (6 days ago)

    I thought wow, 5 years and the world would be different :D, but it already is

  • Karthik C (May 9, 2019)

    +FabianAB You are welcome.

  • GV Rainfall (Mar 12, 2019)

    "so let's go back to the atomic bomb arming and disarming mechanism" - oh right, we started the video with that. I was too busy getting my mind blown by the first switch.

  • Rich Coffing (2 days ago)

    Ummm. Does DECLASSIFIED mean ay thing to you? Cold War? #10megabit1965

  • Skie Fyre (May 12, 2019)

    +jolena auvuya He did no work on actual bombs. He submitted a purpose made design to the government. If you think you can just disarm the US nukes and everything would be fine you have alot to learn about humanity and other parts of the world.

  • FlorimondH (May 4, 2019)

    My experience with plastic fatigue in toys doesn't want me to believe this is a good idea.

  • Xelbiuj (4 days ago)

    I don't imagine the switches on nuclear weapons are triggered over a million times. :P

  • Brian86992DH (5 days ago)

    +Joe Stevenson Not necessarily. When a material is deformed (bent) it has a region of movement that is within the elastic region. This means that no permanent deformation occurs and the lifetime of cyclical deformations within this range can be infinite. This elastic region varies for different materials and designs. A good example of this is you can bend a credit card slightly as much as you'd like. As soon as you bend it too far, though, you leave the elastic region and permanently deform the plastic...

  • B Sc (Mar 26, 2019)

    He should work for Apple. They took a solid reliable design for keyboard key depression and totally renovated it up to total failure with a "superior", failed butterfly design.

  • TreeMobile. (1 day ago)

    I have a fix for apple butterfly design. Turn it upside down. The dust will never get at the middle point if the middle point is upside down.

  • R3D (May 12, 2019)

    This guy is brilliant. I'd rather have him making safety systems for nuclear weapons than keyboard designs for Apple.

  • Federico Barrio Linares (Mar 30, 2019)

    The ending is really anticlimactic.. Its like an open ending in a show, and there is no chance to know what the author meant.. unless we manage to kidnap him...

  • lucas rem (Apr 9, 2019)

    Federico Barrio LinaresThe ending is really ?power down, it still works here...? patrion......He needs a Job badly.....

  • Steven Curtis (Apr 6, 2019)

    Especially since the way it works is not really clear. I don't really get what it's doing to prevent anything from happening.

  • SgtRevan (Mar 23, 2019)

    Begs the question, why are these not mainstream yet?

  • johno (May 11, 2019)

    One. Thats not begging the question.Two. They are mainstream.

  • GlueC (Apr 25, 2019)

    I'm not certain I agree that they aren't mainstream as another comment on this video listed many applications, but I imagine consumer confidence goes against these parts. Which looks more reliable, the metal and rivets or the bendy plastic? It looks too similar to cheap one-use junk like installations tools that are included with some other product.That said, I have decades-old plastic crab crackers that I've gone back to multiple times after the strong-looking metal ones gave up.