Levers and 4 Bar Linkages
ฝัง
- เผยแพร่เมื่อ 20 ก.ย. 2018
- I wanted to do a follow-up video going into more detail about how to work out math for simple 4 bar linkages. We use these all the time in our puppets, but the same concepts could be applied to any sort of hobby engineering or art projects.
This has a criminally low view count. Easily the best explanation about linkage mechanisms that I've seen yet.
Thanks! I'm glad you enjoyed the video. Keep an eye out for interesting little linkages in everyday objects around you!
Agreed
I knew what I wanted to learn more about but I didn't know the name for it. You're the first one that made a video for exactly what I needed and actually used the name
Glad it was helpful! I love learning a term for something I'm interested in and then being able to find a lot more information on it. Hope it helps you make some cool stuff!
I like how simple you explained that, coupled with your natural humor and direct to the point teaching. This has been very helpful. Thanks!
Thanks so much! Hope it helps you make all sorts of amazing things with levers!
This is a really, really unique way of explaining and presenting; you’re conveying a lot of principles in this video in such a fantastic way. Such a great educator! Thank you!
Thank you! It's so fun to play around with these principles with hands on examples. Hope it helped!
I’m an animatronics enthusiast. As I’m starting a new mechanical prop build, i wanted to brush up on the fundamentals of levers and linkages when I came across this video….Its undoubtedly the coolest one out there. For a moment i thought, this got to be a cool physics teacher and then I checked out your channel…no wonder you are a puppet maker/puppeteer….u designed the perfect teaching aid to explain the concept to visual learners like us
Thanks so much! We love animatronics but haven't gotten to experiment with it too much. Now that we have our 3d printer and are more familiar with 3d modeling, and trying to get more comfortable with circuitpython, I'd really love to add more animatronic elements into our puppets. Loved checking out the animatronics on your channel! Did you build those?
Stumbled across this video while working on some linkages homework for my mechanical drawing class. SO informative, simple, concise, and creative. Cheers!
Thanks for the kind note! Mechanical drawing class? Awesome! I wish I had taken something like that. What sort of projects do they have you doing in it?
@@AlexAndOlmsted Some reverse engineering- for example, i took apart a miniature tripod i bring backpacking, measured all the components and created a CAD model of the whole assembly. Also we are learning to communicate the function of different mechanical systems through common engineering diagrams, most recently linkage diagrams :)
@@brandonraggette7546 Sounds like fun! I really enjoy reverse engineering. I recently build a giant 3' tall iPhone as a stage prop for a local band and was so thankful to have an okay set of calipers!
So sad to see the less views and less number of subscribers :( best demonstration ever seen . Valuable work . thanks for such a valuable video
Thanks! We'd love to get more subscribers and share our work to a wider audience base. Feel free to tell your friends :D
So, this is maybe the third or fourth video that I watched. I love your Channel., Let me preface this by saying I love education. I love learning... but Dude! the last time I had geometry was over 40 years ago! I would gently suggest an addition to this video where you're actually applying visually, these examples to the articulation for a paper puppet. I was a good student, but bad at math., so I just suffer through it because I have to. My guess is that for a lot of Americans especially, watching, this is over their heads. We don't remember it because we literally had only one class throughout our entire education,. That could include college. Also, a lot of people don't know what a protractor is, or what it does. They assume that you eyeballed those paper circles, Andrew them free hand. Or, they don't understand what the word "fulcrum" means. I do love how you are excited by the mechanical engineering. I would just (and yes, I hate this most of the time too), "dumb it down" for us mere mortals. Still, I'm looking forward to the other of your videos that I've saved to my playlist.
I watched this with the same kind of engagement I feel for a magic show. Very cool stuff. Math is crazy.
Commenting for algorithm.
Best linkages intro vid I've seen, better than most classes 👍
Thanks for the algorithm boost AND the nice comment! I find linkages endlessly fascinating and am surprised there aren't more videos on them.
best video about linkages ive ever seen
Thanks! Glad you found it useful!
Excellent visualization! Thanks- I know it’s 4 years old but I’d love more
Thanks so much! We've been very busy lately with our live theater and puppetry work, but we have some more ideas for videos like this in the future!
Best linkage mechanism explained thank you very much sir.
very very helpful video!!! great way of using CAD, Cardboard Aided Design
Ha! I love that term! We'll have to incorporate that in the future :)
Great ideas, I didn't think those bars would be precise, but as you said - and showed - in a small region this will be sufficiently precise and more robust than belts and pulleys.
Thanks! Yeah, precision with paper is tricky but possible. It helps using thick cardstock to keep your paper from bending, and if you're working at a larger scale it's easier to get it closer to how you want it.
I saw this more as a prototype like Tim Hunkins showed in one of his "the secret life of ..." (linkages?) : paper and cardboard linkages are great to iterate your ideas, then you can switch to wood or metal when you get the right movement.
And you did show a good precision with paper, eg with the opposite rotations at 19:02, that surprised me.
I don't know anything about geometry, but this was absolutely fascinating and very well done. I really appreciate the effort and explanation!
Thank you! I never really understood or was interested in geometry until I started playing around with real-world applications for it. Now it's totally fascinating!
By far the best explanation ever came across regarding linkages. GREAT! work sir. Thanks!
Thank you so much for the kind words! 😁
Great video. Left my wishing for more followup video on linkages in this style.
Our teacher got us to watch this video to understeand Levers and Linkages, and honestly, as a student, I'm amazed how you explained this so well,better then even some teachers.
Thanks so much! That means a lot. There are so many different ways to learn new concepts. That's awesome of your teacher to recommend TH-cam videos for those of us who are visual/hands on!
Sorry I made a few spelling mistakes
@@Kavilion_ No worries. I'm not that great of a speller, myself.
Excellent demonstration! Clear and concise.
Thanks! Glad you enjoyed it :D
Aiit I really can’t say how much I should appreciate this because your work stand out. I am 100% satisfied and saying big thank you 🙏 to you for all these volume of knowledge. So I just want to start the course of mechanism with my students but I need worksheet and also a lesson resources such as simple calculations and presentations slide on. I would really like to work with you to achieve this thanks 🙏 once again
This amazing video has helped me learn much more than I came here for. Thank you so much for the effort you used in producing this video and sharing your knowledge, including your thought process, with us.
Thanks for the thoughtful words, LennyLen! I'm so thrilled to stumble upon videos that surprise me with how much more I'm learning, and I'm happy this could be one of those for you :D
excellent demo and instruction
I started out designing a really cool folding cup holder for my van using this process. I then machined out the parts on my Bridgeport mill, it was amazing to see how much just .020 difference in pivot points would would make the difference between work perfect or jamb! Again great video!
That's awesome! Do you have any video of the cup holder in action?
Yeah, those tiny little changes in pivot points change so much! Especially the closer to pivoting points get to each other. It's also amazing how much changes when you switch from a paper or wood prototype to metal, and all of a sudden the tolerances are much tighter!
Love this! Subscribed and will follow all updates. Thank you so much!
All the years of being talent shooting TV and having to wait for airplanes... wish we could have done that! Thanks for the chuckle!
Haha, no problem! Now our big problem are the guys leaf blowing every day when we're trying to record VO!
This was so educational and interesting! Thank you!
Thanks so much! :)
A great video, many thanks.
Thank you! Great video! Realy like how you visualize
You're welcome! Glad you enjoyed it :D
Thanks for the video! Helped a lot!
This is such an excellent video! This is exactly what I was looking for and more. Thanks a lot!
Thanks! What sort of things are you making/experimenting with that uses this? Or is it just out of curiosity?
@@AlexAndOlmsted Woww i just need it for the animation!!!
Great explanation ❤
Thank You.
18:30 He's doing all of this for puppetry?! Amazing! I'm using it to set up the steering on my go-kart.
This is so perfect! Thank you!
Thanks so much! Hope it's helpful!
@@AlexAndOlmsted Yes really clear presentation. There's surprisingly very few videos covering this area.
Really a commendable video, not only showing the correctness but also harping on the mistakes that can eventually happen during the course of designing. I'm not a very technical person, neither am I very prone to technical precisions. But as a puppeteer, I found it to be very useful and handy in using it in my Shadow puppets, if not in other forms as well. Great demonstration!! Thank you so very much.
Thanks so much! I find it so much easier to understand these concepts if I can get my hands on physical examples of them. Hope your shadow puppet work is going well and stay healthy!
Amazing video
A good video and easier for learning, thankful
Thank you! Glad you found it helpful.
very nice demonstration Thanks for sharing
Thanks! Glad you enjoyed it :D
i will be playing this video in my engineering lesson, next week xx
Greetings, engineering students of the future! Go forward and make (mechanical) connections!
Wonderful Brother, So beautifully explained
Thank you! Happy engineering, Tanbir!
Great job. Im currently trying to find a way to reduce the torque load on a small servo motor to be able to push two tires into a turn. I started to use the shaft and steering gear plate and adding a bearing but I think the force needed would strip the gears on the motor. Easy fix with a bigger motor but I want to find the right combo of gears or levers to make a small motor move large objects. Just a matter of the number and position of levers or gears. Your presentation has given me some more ideas to test. Thanks
Great! Thanks for the comment. We love hearing about real world applications like this. Finding the right way to gear up or down a motor is so valuable, too!
Very interesting and clear explanation. Really I enjoyed it 😁.
Thanks! I'm always fascinated by simple machines.
This is one of the coolest videos I've seen a long time! The creativity and depth of knowledge illustrated in simple visual terms is simply astounding! Bravo! If you are entertaining requests during these potentially slow days, it would be cool to see this type of illustration used to show how one circle drives the other circle in a >180 degree oscillating rotation, with the driving circle making complete 360 degree unidirectional rotations. ;)
Glad you enjoyed it, and thanks for the suggestion! That's a cool idea! I'm not sure if it's a typo, or if I'm thinking of a different setup, but the driving circle would go 360, and the following one would go 180. I'll put it on my list! :D
@@AlexAndOlmsted Now I'm trying to remember what I was thinking! LOL - I think the application I was envisioning would be to have the first perform the full 360 degree rotation in a single direction and have the second move greater than 180 degrees but less than 360 degrees. It would actually be very cool to contrast that to the second going less than 180 degrees so both practices could be observed. The applications of having the driving "wheel" rotate 360 degrees in a single direction (such as a crank or motor driven source) can be rewarding for achieving a less than 360 degree rotation of the targeted "wheel" for things like rotary oscillation and the like. I'm no math guru, but I have a feeling the application for less than vs greater than 180 degrees will require different solutions perhaps? I don't know what the solutions are, but I can picture it being a very satisfying visual experience in the manner you did for this video. :)
@@sethbrandes2979 I love that idea! I definitely know you can achieve
Excellent explanation.
Thank you!
Thank you, subscribed, very well done.
Ross
Thanks, Ross!
Thank you so much!
nicely done.
Thank you!
Man...🤯🤯🤯🤯..great explanation..
Thanks so much!
Good stuff!
Thanks!
Thanks for the help
You're welcome!
excelent and in simple way
Thanks! Have a great weekend, and happy building!
Thanks a lot sir.
My pleasure!
TNK YOU... VERY USEFUL !
Fantastic
Thanks!
I’m confused, when you were finding the tangent line, how did you determine the size of the smaller circles inside
For this example it doesn't really matter what size those smaller circles are, as long as they're the same on both discs. I just made them about 1/2" smaller than the discs so there would be plenty of material around the thumbtack connection points so it wouldn't tear through the edges.
Hope that clears things up!
@@AlexAndOlmsted it does, thank you!
What an entertaining and highly informative demo and props. Im trying to devise a mechanism which allows 90 degree rotation to a bar that will be used as a drop bolt. The 90 degree oscillation will be the limit for LOCK and UNLOCK position. I will greatly appreciate if you can help me figure out its geometry. The mechanism has to be powered by a motor which will be operated by a home automation system. Thanks.
Thanks so much! That sounds like an interesting project. I would recommend looking into bellcranks for 90 degree rotation. We even made a video about them here: th-cam.com/video/b8zK0ZN7vIk/w-d-xo.html
Hope this helps!
Very nice video !!
Thanks
I have a question ...
At 5:34, do we gain or lose any torque ?
Good question! I'm a self taught engineer, so other folks feel free to correct me.
I think at 5:34 the lever on the left has more torque, and the one on the right has less. Imagine that each lever is a wrench and you're tightening a nut. The lever on the left is longer so you can apply Force further from the pivot, giving you more mechanical advantage.
But I could be wrong!
I'm an engineer, and this blew my mind. I've always been interested in levers, 4 bar linkages. I knew the basics, and what I wanted to do with them but never knew how to implement it. Now I'm hooked and I want to know more, can you recommend any books?
That's awesome! Sadly I don't know of any books on the subject, though I'm sure they're out there. I'd recommend looking up automata and kinetic sculptures on TH-cam. There are a lot of fun/artistic implementations of levers and 4 bar linkages. This news segment with Paul Spooner is one of my favorites: th-cam.com/video/ItXQitOODZw/w-d-xo.html
"Mechanism Design", and "Advanced Mechanism Design" by Erdman and Sandor. Also "Design of Machinery" by Robert Norton.
I recommend searching for the older hardcover versions of the Erdman and Sandor books, as they have a noticeably better print quality than the paperbacks.
Best+++👍
😎👍🤖
Sir sorry Dumb question. If i wanted to triple the throw length of a actuator arm to 60" using levers. Could I use a 20" actuator? What would the lever(s) look like? Great demo Man awesome
Hey, no dumb questions man! That's an interesting problem. I haven't worked with actuators too much to know how to solve this off hand. I imagine you would have a lever with the fulcrum at one end, and your 20" throw actuator attached to the lever near the fulcrum. Somewhere further up the lever would be a point that travels 60". I'm guessing it would be 3 times further from the first actuator than the first actuator is from the pivot. It's important to know that the lever is going to travel in an arc, though, and a benefit of a linear actuator is that it can move in a straight line and not take up as much space.
Very nice explan
Thanks! Glad you enjoyed it :)
..hey there - im new to your channel and found this so fascinating and transferable to other sectors. . How have you actually implemented these principles in your puppet shows and are they the same concept as automation..?!? Please keep 'em coming :)
Hi, and welcome! Thanks for the nice comment. We've used these concepts pretty extensively in our shadow puppets, both for live shows and our short films. It's also a great way to prototype a movement that will eventually be in a 3d puppet. 4 bar linkages work especially well in automata since they restrict movement to what you want, meaning you can have a whole series of connected pieces that all animate off the same crank.
if i have two circles (wheels) that i want to spin together but they're different sizes, can i do this with one bar? It's for a horse and carriage shadow puppet?
Good question! As far as I know, you cannot. Even if the bar was attached equal distances from each circle it wouldn't work. The second wheel will just pivot back and forth. Make a little cardboard mockup and you'll see why.
I would recommend attaching a thin pulley (make one by stacking different diameter circles or use an old bobbin) to the center of each wheel and connect them with a bit of string or elastic with just a little tension. Make sure your pulleys have enough grip that the string doesn't slide though. You can glue a little strip of sandpaper on them to make them super grippy. Then you can spin the one wheel and have them both move.
Let me know how it turns out!
Thanks! 7th grade geometry now makes sense...
Thanks so much!! Really appreciate it. I was just helping my little sister-in-law study for her geometry final and we ended up having a lot of fun with it.
Thanks
You're welcome!
Very good video, good narration, good explanation and all round a very good vid. Are you mechanism engineer or designer or related field?
Thank you! I'm a puppeteer, and found a greater love of simple machines and mechanisms through building puppets and automata.
Alex and Olmsted you are most welcome. i just wanted to ask you if you know how to make automata's and you answered me before i even asked :-D how cool is that😀 where can i see some of your automata works examples?
@@sirpfa Ha! What a coincidence. I love automata. I haven't worked on any recently but I'll look through my older stuff to see if I can find anything good. I had the honor of repairing a few pieces from the Cabaret Mechanical Theater collection in Baltimore a few years ago, which was a real treat! Do you make automata?
@@sirpfa Here's a minimalist automaton I made: instagram.com/p/B2DWhDHJyDR
Alex and Olmsted wow thats incredible. Great job👌🏻I guess someone above seating over the clouds brought us together 😀 sadly i dont but i want if possible with someone like you... iv been around it since god knows when...I just like mechanical wonders such as music boxes but automata's are peak of the mechanical wonders in my opinion.
I have a question from you. Since you have the relative knowledge are complicating are one dimensional automatas like the ones in link below?
th-cam.com/video/VSuDblGIPRo/w-d-xo.html
C+LEVER 👍
🤓👍
If I applied force to the centre of the lever to move the load up, with a scalpel in my hand, I sure had heck would slice my finger!
Haha! Then you could make a little 4 bar linkage to open and apply a band-aid!
@@AlexAndOlmsted 🤣🤣
Which airport bro😊
Space X, by the sound of it! 😂
@@AlexAndOlmsted 😂
What do we call a mechanismthat uses linked levers
Hmm, I think it might depend on the specific mechanism. Connecting two levels with a linkage does make a 4 bar linkage. Whatever is keeping the pivots of the two levers at a fixed distance (even if it's just the earth) acts as the fourth bar.
Did you have a specific example in mind?
And that sounded like a fighter jet....
I think it was! Thankfully we're all still here afterwards.
I get it... but only in this presentation o,,o
'tis a good presentation.
Thanks! Once you can remember the three classes of levers you can keep an eye out for them all around you.
@@AlexAndOlmsted thank you! yes that is a great idea.
I am a be-lever
🙈
Ha!
Love this! Only thing is the robot voice sucks
Thanks! We're saving up for a better voice module for our Cardboard Robot Assistant.
Lose the robotic voice . It’s hard to hear clearly. If you won’t to keep the stick , change voice to a cars navigation.
Cardboard robot AI voices are pretty difficult to program. We're currently trying to raise funds to develop a more advanced AI. If you'd like to help out, consider joining our Patreon!
YOU must live in a bad neighborhood