Compliant Transmission Mechanism with Two Decoupled Degrees of Freedom

This video introduces a compliant mechanism that converts two rotational degrees of freedom (DOFs) into two translations with a specified transmission ratio. In other words, two handles can be rotated to drive an output stage such that it translates in two different directions according to a ratio that relates how much the output stage translates over how much the two input handles rotate. Moreover, the mechanism uses decoupling flexures so that each input handle can be rotated independently without appreciably affecting each other and so that the desired output motions of the stage are also independent and achieve negligible parasitic motion error. The mechanism was designed using Prof. Hopkins’ freedom and constraint topologies (FACT) synthesis approach.
To learn more about the compliant transmission mechanism of this video, you can read our journal paper published in Precision Engineering:
www.sciencedirect.com/science...
The part files for the mechanism can be downloaded from Thingiverse at this link:
www.thingiverse.com/thing:543...
Acknowledgements:
Special thanks to Dr. Robert Panas and Professor Martin Culpepper for helping to collect data and fund the effort at MIT.
Also, we acknowledge the following source:
commons.wikimedia.org/wiki/Fi...
upload.wikimedia.org/wikipedi...
U.S. Air Force photo/Airman 1st Class Laura Max., Public domain, via Wikimedia Commons
Donate to help support my channel:
If you’d like to make a one-time donation, you can use the following link:
PayPal.me/FACTsMechDesign
Thank you for your support! It is much appreciated and helps enable me to make more content.
Disclaimer:
Responsibility for the content of this video is my own. The University of California, Los Angeles is not involved with this channel nor does it endorse its content.

Пікірлер: 116

  • @BRUXXUS
    @BRUXXUS Жыл бұрын

    Shockingly great explanation and demonstration! I also very much love that these are provided for 3D printing.

  • @alericjohansen6775
    @alericjohansen6775 Жыл бұрын

    I'll be honest, a lot of what was said went over my head, especially at the part in the middle where it was putting up all the formulas and such that you used to determine it's degree of translation (i don't even know if im using that terminology right, lol) I come from practical knowledge of car mechanics. so when i saw the title that mentioned a transmission mechanism, i thought it had to do with actual car transmissions, and was VERY curious how this would fit in with that stuff. I'm SUPER glad i clicked on this as a result. i learned something new that still had to do with mechanics, just not with car mechanics, lol. ill have to watch this a few times to fully grasp exactly what im looking at, but its REALLY cool

  • @helmet098
    @helmet098 Жыл бұрын

    I like your videos because the way you break it down, you really explain it in a way that anyone can understand.

  • @levoniust
    @levoniust Жыл бұрын

    Thank you for providing the STLs. for me there is no better way to learn and understand a new concept than to get my hands on it!

  • @MadHatter123456
    @MadHatter123456 Жыл бұрын

    Oh my. As a mechanical engineer, I can roughly imagine how much time, brain matter and effort you've put into this. Great work, truly amazing!!

  • @capnthepeafarmer
    @capnthepeafarmer Жыл бұрын

    I love flexures in mechanical design! They are so useful and customizable people often overlook their use!

  • @Shrike200
    @Shrike200 Жыл бұрын

    At first I thought this wasn't serious, because the start just sounded like this: "The original machine has a base-plate of prefabulated amulite, surmounted by a malleable logarithmic casing in such a way that the two spurving bearings were in a direct line with the pentametric fan"

  • @MrSaemichlaus
    @MrSaemichlaus Жыл бұрын

    Excellent explanation, made sense all the way through.

  • @DogeMultiverse
    @DogeMultiverse Жыл бұрын

    client: i want as much jank as possible. designer: say no more

  • @andrewwatts1997
    @andrewwatts1997 Жыл бұрын

    In the beginning of the video I thought ( this would be amazing for microscapy ) low and behold, 3 minutes later. Amazing work!!

  • @Trent-tr2nx
    @Trent-tr2nx Жыл бұрын

    Excellent and well summarized. When designing, did you also simulate/measure whether temperature could induce unwanted motion in the flexure?

  • @nos9784

    @nos9784

    Жыл бұрын

    Isn't that simply a question of "use stuff that has the same thermal expansion in all directions"? I guess rolled steel could break that- it gets anisotropic in rolling direction.

  • @JESUSCHRYSLER5512

    @JESUSCHRYSLER5512

    Жыл бұрын

    @@nos9784 THERE IS **NO** SUCH WORD AS ANISOTROPIC!!**

  • @nos9784

    @nos9784

    Жыл бұрын

    @@JESUSCHRYSLER5512 uhm... are you sure? After all, I just said it? If there wasn't before, there would now. anisotropic. There, I did it again, copied from wiktionary. Whats your point, and what is wrong with you?

  • @JESUSCHRYSLER5512

    @JESUSCHRYSLER5512

    Жыл бұрын

    @@nos9784 nothing is wrong with me, **KAREN!!** DERGON DERZHERLERABLE SPPLERZGERNOVLERS DERZHERLERABLESZHNOILBLWRZHERCOBSHERVER DERGON DERZHERLERABLE SPPLERZGERNOVLERS DARZHNARZHZARZHER.

  • @Shit_I_Missed.

    @Shit_I_Missed.

    Жыл бұрын

    @@JESUSCHRYSLER5512 an·i·so·trop·ic [anˌīsəˈträpik, ˌanˌīsəˈträpik] ADJECTIVE physics (of an object or substance) having a physical property that has a different value when measured in different directions. A simple example is wood, which is stronger along the grain than across it. (of a property or phenomenon) varying in magnitude according to the direction of measurement: "electron scattering is anisotropic"

  • @robinmoussu
    @robinmoussu Жыл бұрын

    Thanks for sharing. It’s was very informative, and easy to understand.

  • @weirdsciencetv4999
    @weirdsciencetv4999 Жыл бұрын

    This is absolutely brilliant

  • @senftube2460
    @senftube2460 Жыл бұрын

    as a german, I appreciate the design of the front

  • @multiforc271
    @multiforc271 Жыл бұрын

    WOW, i loved it, the mechanism was beautiful and interesting. designing the mechanisms are wonderful, assembling different piece of puzzles, different properties and characteristics to create a piece art, or better say, piece of engineering, that can be anything we want to be is the joy of life. I wished i could do my PhD in this field, but to be honest I have lost my self-confidence and mojo. By any chance, can you spare few minuted of your time to read my cv, and give me your opinion for the next stage of my life ??? i have recently finished my master.

  • @igorteller2371
    @igorteller2371 Жыл бұрын

    Amazing! Thank you a lot for sharing

  • @Legomasterguy
    @Legomasterguy Жыл бұрын

    Fantastic work!

  • @indian.techsupport
    @indian.techsupport9 ай бұрын

    I love the felxures on the front

  • @mp6756
    @mp6756 Жыл бұрын

    To avoid risking embarrassment my comment will be limited in the next few words. Very nicely done

  • @josepablolopezaguado6191
    @josepablolopezaguado6191 Жыл бұрын

    Thanks so much for the amazing content, I think a video on the techniques and tips and tricks on how to actually manufacture and assemble flexure mechanisms would come in handy, do you use CMM machines to verify the assembly? Are dowel pins enough for part alignment?

  • @chadjones1266
    @chadjones1266 Жыл бұрын

    Another great use.

  • @HuskyMachining
    @HuskyMachining Жыл бұрын

    this is so cool! This makes me want to go back to school and get a mechanical engineering degree

  • @sethbettwieser
    @sethbettwieser Жыл бұрын

    When you said how little it moved, I immediately thought of working with microscopes and, lo and behold, so it was designed for.

  • @planckstudios
    @planckstudios Жыл бұрын

    seeing the angles of the blades on a flexure bearing intersect w/ the body's rotational axis - can that be used as a generic marker for identifying movement/function in these complicated flexures? if flat multiple flexures converge, follow the lines, then twist body along perpendicular axis at the meeting point?

  • @kitewinds663
    @kitewinds663 Жыл бұрын

    Super cool! Thanks for sharing. I tried to follow your link to Thingiverse but unfortunately this do not work. I can only see two designs at the landing page, and none of those two is the one from this video. If you ever consider sharing the geometry, please post a link, as I would love to print a version of this for my usb-microscope :)

  • @satibel
    @satibel9 ай бұрын

    now if you fix a laser on it and add a lens, use the mechanism to move a lens relative to the laser, or constrain the front of the laser with the moving plate and the back with the ground, you might be able to get extremely precise cuts. the other option would be to simply have the piece you wanna cut on the plate.

  • @Ray-mr3gq
    @Ray-mr3gq Жыл бұрын

    Awesome awesome awesome mechanism.

  • @TheOriginalBubster
    @TheOriginalBubster Жыл бұрын

    Quite a interesting shape on that square

  • @DanielReetz
    @DanielReetz Жыл бұрын

    These are so cool. Are you cutting them via waterjet or wire EDM?

  • @fella9921
    @fella9921 Жыл бұрын

    I love this

  • @quentinmangel2265
    @quentinmangel2265 Жыл бұрын

    amazing

  • @Nets-nutsBr
    @Nets-nutsBr Жыл бұрын

    I understood. A quick question: how did you have the insight: "yeah let me make this super duper mechanism" ? Would mind telll us how such great idea was born? Thanks!

  • @xaytana
    @xaytana Жыл бұрын

    I want to see this miniaturized, say a 25mm cube, and made as a one-piece part, with a modified pitch so that movement isn't microscopic, align the rotational axes with the cubes center, and give the linear portion more throw. There could be some interesting applications for this throughout all scales.

  • @mildsauce5019

    @mildsauce5019

    Жыл бұрын

    but do you have a product which people would pay for? if so, what is it?

  • @ker6349

    @ker6349

    Жыл бұрын

    @@mildsauce5019 get out of here with that hypercapitalist nonsense.

  • @SoulAir

    @SoulAir

    Жыл бұрын

    @@mildsauce5019 Hot sauce

  • @ced6354
    @ced6354 Жыл бұрын

    Brillant

  • @tinkerbench
    @tinkerbench Жыл бұрын

    I feel smart now. Joking aside I understood everything he said and actually found it cool.

  • @mully006
    @mully006 Жыл бұрын

    What is the sensitivity of this mechanism to thermal expansion?

  • @mitchellsteindler

    @mitchellsteindler

    Жыл бұрын

    Infinity 🤣🤣🤣

  • @EternalDog
    @EternalDog Жыл бұрын

    But where does the Retro Encabulator fit? Does it have hydrocoptic marzelveins fitted to ambaphasiant lunar wainshafts to prevent side fumbling?

  • @Caramelldanson
    @Caramelldanson Жыл бұрын

    When in use as a microscope stage, how is the target flexion maintained?

  • @travisallen5716
    @travisallen5716 Жыл бұрын

    I followed the link to the thingiverse files but the files from this video don't seem to be there

  • @jameshopkins21
    @jameshopkins21 Жыл бұрын

    This is an amazing mechanism! Was this designed to repair or create microchip circuitry? One could also create nano art and sign it with a nano-sized signature for display in a nano gallery for mega-bucks!

  • @noobulon4334

    @noobulon4334

    Жыл бұрын

    Its intended to be a finely adjustable microscope stage

  • @steveharrigan7811
    @steveharrigan7811 Жыл бұрын

    Could this be used to set up the intonation on a guitar?

  • @samwpatterson
    @samwpatterson Жыл бұрын

    "Now is the story of a family who lost everything.." ❤️

  • @nickjohnson410
    @nickjohnson410 Жыл бұрын

    This is awesome I don't understand any of the math... But it's still awesome

  • @dieselphiend
    @dieselphiend Жыл бұрын

    It essentially has no 'moving pieces'. It's 'solid state', and yet, it has two degrees of freedom.

  • @ternovoygarri
    @ternovoygarri Жыл бұрын

    It resembles apparently some tibetan sign of sun... 😁 Great work!!!

  • @darkracer1252
    @darkracer125210 ай бұрын

    what a compliant mechanism. i have seen solid hardwood tables more compliant then this thing.

  • @leeknivek
    @leeknivek Жыл бұрын

    perfect, the precision swastika, just what the world had been waiting for

  • @Jkauppa
    @Jkauppa Жыл бұрын

    two discs on their axles, one running side ways on the other, 90 degree angle, its a cvt transmission with the other disc being the clutch

  • @Mr.YExplains
    @Mr.YExplains9 ай бұрын

    Did the 3D print. Thanks,

  • @johnjensen2217
    @johnjensen2217 Жыл бұрын

    Very cool device but I have to ask what advantage does this have over a two axis stage moved by manual screw drives geared down to provide fine motion?

  • @hamjudo

    @hamjudo

    Жыл бұрын

    This has much less backlash.

  • @d0tline468

    @d0tline468

    Жыл бұрын

    none, this is a precision movement controller that not only needs force to be constantly applied to remain at a given position and will rapidly lose precision as the spring temper wears unevenly between the two with every movement. The only real use case for very complicated compliant mechanisms is for products too microscopic to physically produce that outcome in any other way.

  • @Unmannedair
    @Unmannedair Жыл бұрын

    Wow, this would be great for aiming lasers.

  • @danko6582
    @danko6582 Жыл бұрын

    Does the stage twist, though?

  • @hashbrown777
    @hashbrown77710 ай бұрын

    I'd love to see the various 3D printer channels give those files a crack, and also design a way to have those inputs not move when not touched (id est not flex back once you have made an adjustment and just want to look down the microscope and maybe write some notes)

  • @leozendo3500
    @leozendo3500 Жыл бұрын

    cool but why does piezo ceramic not work?

  • @redpug5042
    @redpug5042 Жыл бұрын

    maybe by using a screw, you could move those handles (replaced with gears) and then a set of bevel gears to turn 90 degrees to get easy to use handles that keep their positions

  • @henriksundt7148

    @henriksundt7148

    10 ай бұрын

    If you introduce gears, you could just as well skip the rest of the mechanism and translate the centre stage directly by toothed bars.

  • @user-tk2jy8xr8b
    @user-tk2jy8xr8b9 ай бұрын

    Does the mechanism include a swastika on purpose?

  • @phpn99
    @phpn99 Жыл бұрын

    Interesting, but that can easily be done with a handful of racks and pinions or worm screws. Well ; maybe at a large scale, but likely not at a microscopic scale.

  • @JinKee
    @JinKee Жыл бұрын

    Is there any material that is 100% immune to work hardening and fatigue?

  • @canylmaz7185
    @canylmaz7185 Жыл бұрын

    Love 🥰

  • @satin227
    @satin227 Жыл бұрын

    This reminds me of G-Force sensors in smartphones and other electronics

  • @321750101
    @321750101 Жыл бұрын

    What happens if we invert the input direction, would small micron sized motions be blown up by the same ratio to generate course motion in the handles? Can some analogous compliant mechanism be designed for efficient energy conversion from finer resolution scales to larger ones

  • @tHaH4x0r

    @tHaH4x0r

    Жыл бұрын

    Sure, that works. But keep in mind that this is not 'energy conversion' or 'power conversion'. The power that goes into a passive transmission is equal to the power that comes out (minus losses). That means that although you have as an input tiny motions, you will need very large forces to achieve large motions with small forces on the output.

  • @321750101

    @321750101

    Жыл бұрын

    @@tHaH4x0r right! meant more like motion patterning. Imagining some encoded information getting translated upwards in scale with a use of some "amp", a weird form of compliant data storage.. kinda like a vinyl record player or RNA polymerase going through DNA

  • @DogeMultiverse

    @DogeMultiverse

    Жыл бұрын

    @@321750101 try atomic force microscopes

  • @321750101

    @321750101

    Жыл бұрын

    @@DogeMultiverse hahahah pretty much

  • @meinleben2132
    @meinleben2132 Жыл бұрын

    Our future is physically solid state, that's so very cool.

  • @demetriusmichael
    @demetriusmichael Жыл бұрын

    I’ve seen a lot of large turn into small movement. Are there any examples of the reverse?

  • @SoulAir

    @SoulAir

    Жыл бұрын

    Its aluminum, so how are you going to have the strength to bend it like that?

  • @demetriusmichael

    @demetriusmichael

    Жыл бұрын

    @@SoulAir referring to the KZread channel / complaint mechanisms in general, not to this specifically.

  • @SoulAir

    @SoulAir

    Жыл бұрын

    @@demetriusmichael Gotcha

  • @notconnected3815
    @notconnected381510 ай бұрын

    Wow, this is genius! Dis some one try to 3D-Print it?

  • @konradtabbi5875
    @konradtabbi5875 Жыл бұрын

    Nice mechanism but why does it need to look like a censoried 1944 sign? Ps:i'm sorry if you didn't noticed it.

  • @ramonhamm3885
    @ramonhamm3885 Жыл бұрын

    Can you add the 3rd dimension of movement?

  • @TheFACTsofMechanicalDesign

    @TheFACTsofMechanicalDesign

    Жыл бұрын

    Yes, you could add any DOF with any transmission you'd like using the FACT theory to design it.

  • @xspager
    @xspager Жыл бұрын

    Interesting shape you got there would be terrible if it looked like something BAD

  • @raymondelder5004
    @raymondelder5004 Жыл бұрын

    it would be sweet if somebody 3d printed this.

  • @dimitar4y
    @dimitar4y10 ай бұрын

    I can't imagine the math required to do this. Imagine someone trying to design this 30-40 years ago. Headboom.

  • @geraldozambrinjunior4667
    @geraldozambrinjunior4667 Жыл бұрын

    👍👍👍👍💯

  • @21doctor54
    @21doctor549 ай бұрын

    this is all well and good. i noticed a slight minor flaw in the design. your output looks like a swastika...

  • @jakubhostinsky4482
    @jakubhostinsky448210 ай бұрын

    Fancy Etch A Sketch :-D

  • @TheStuartstardust
    @TheStuartstardust Жыл бұрын

    7:34 - why the big outlier? 🤔 My brain does not like it 🤓😄

  • @Graham_Wideman

    @Graham_Wideman

    Жыл бұрын

    Yes, I saw that too. It's off by about 20% of the entire range! There must be some interesting story about that. And why were the measurements taken at such irregular intervals? Not linear, but not log either. And the outlier point was conspicuously close on the X axis to another point that had a Y value that was spot on. Very odd. Maybe the mechanism had some sticking point or buckling point.

  • @jmssun
    @jmssun5 ай бұрын

    2:39 “Show me your transmission capabilities”

  • @holski77
    @holski77 Жыл бұрын

    I watched this video and now i know im a dummy head

  • @gmonte00
    @gmonte00 Жыл бұрын

    This is so hard

  • @roxasparks
    @roxasparks Жыл бұрын

    I understand this well... but boi dose it hurt my head.

  • @ijuvatar
    @ijuvatar Жыл бұрын

    my brain cant handle this mechanism i am sorry

  • @MrGmanFreeman
    @MrGmanFreeman10 ай бұрын

    wow a sideways etch-a-sketch

  • @kevindomenechaliaga8085
    @kevindomenechaliaga808510 ай бұрын

    ¿What?

  • @aidshusten240
    @aidshusten2404 ай бұрын

    like the sun symbol

  • @AuthoritativeBanana
    @AuthoritativeBanana10 ай бұрын

    BLACK hair

  • @TheFACTsofMechanicalDesign

    @TheFACTsofMechanicalDesign

    10 ай бұрын

    Yes. Hair color is strongly correlated with hair thickness.

  • @thetruthexperiment
    @thetruthexperiment Жыл бұрын

    Yeah well, that’s all well and good accept it looks like a swastika. Better start over.

  • @thatGUYbehindthemask
    @thatGUYbehindthemask Жыл бұрын

    but you cant put this transmission in a car...

  • @a51mj12
    @a51mj1210 ай бұрын

    Is that supposed to be impressive...?

  • @leaettahyer9175
    @leaettahyer9175 Жыл бұрын

    Throw that in the waste bin and buy a Tesla

  • @montagray3761
    @montagray3761 Жыл бұрын

    Seems utterly useless and prone to hyper metal fatigue. Pointless

  • @Graham_Wideman

    @Graham_Wideman

    Жыл бұрын

    How it seems to you may be telling us more about you than the mechanism!