Great explanation, i like how i can understand how the mechanism works instead of it just being like ok heres a cool mechanism

A joystick with variable sensitivity, simply and mechanically, sounds like a pretty useful thing to have.

Very neat mechanism. This exact layout seems better suited for "more limited" and "less limited" travel of the translational stage. If you're going for "no movement" or "free movement" it seems like you'd be better off to remove all of the yellow components and just make your red bistable switch have a pin on the end that locks into the translational stage.

With one or two design iterations it should be possible to really achieve near-zero stiffness. :) Very cool mechanism!

Excellent explanation, very interesting mechanism!

That is really amazing!

cool mechanism. the stiffness cancellation is neat.

you are simply the best !

Great and very interesting stuff!

Very cool

Well nice explanation final blue curve is my ride and handling bushing stiffness for Control arms in and other chassis structures

Do you have any reccomended reading for compliant mechanisms? I completed my Bachelors in Mechanical Engineering and compliant mechanisms were not mentioned even once in all of my courses.

@TheFACTsofMechanicalDesign

Жыл бұрын

Yes, Larry Howell's Book on Compliant Mechanisms is excellent.

@CorvidianSystems

Жыл бұрын

only $120-180USD 😖

@Mawyman2316

Жыл бұрын

@@CorvidianSystems It's free if you know where to look.

kinda like a big accelerometer that you could lock into place during take off, then loosen up once all the vibrations have ended, outside of the atmosphere.

So much work and talent went into the design, implementation, paper and video. I just feel the product is bulky, unresilient and without practical application. Surely there are better use cases to showcase compliant mechanisms?

Can this be used to isolate a table with legs on four of them?

Can someone please explain to me what F(kT1) means at 3:52? When the object is displaced +5cm (to the right), the force coming from the spring would be pulling back (to the left). Wouldn't the graph show a line from the top left to the bottom right? Is F(kT1) how much the "user" is pulling back on the object?

@tomsko863

Жыл бұрын

@@BharatKambalur It does make sense (in all the graphs) if you assume F(kT1) is the force that the "user" would have to use to get the object to the position "x". So to keep the object in position "X" you would need to exert a force "N" on the object to keep it in that position. Basically, it's ambiguous what naming convention the author is using but the graphs are correct in amplitude.

I love compliant mechanisms, but I'd like to see real usecases, preferably something that maybe everyone uses but no one knows about it.

@rubenexplains2640

Жыл бұрын

A simple one is the lid of a shampoo bottle. A more exotic one is the mirror alignment mechanism in the James Webb Space Telescope.

In layman's terms: It looks like a way to make a joystick self-centering or non-self-centering, possibly by mechanically moving some kind of bezel around it. (At least it seems one of the most obvious applications.)

I have no background in engineering and this is absolutely crazy to me.

amazing. how could this be applied to a worm gear

Surely you could have used Yellow and Light-yellow instead of complicating things with Orang and Yellow? Thank you.

I think repeatability was hampered by your 3d fabrication method. It looks to be FDM? While good for hobby I don’t think it’s great for what are doing.

'repeatable for practical applications'. I give those printed wire tuning springs < 1000 reps before they're deformed and unreliable. That's not practical compared to other solutions. It's novel and innovative for sure. flexures will be little more than a curiosity to most makers until simulations and metal printing are more common

@andrewphillip8432

Жыл бұрын

How do you think the tuning springs would fail? There are so many of them in parallel that they might not be stressed very highly. Also they should load share pretty evenly since the plastic will creep a little bit initially, so if manufacturing tolerances cause one string to be a bit too short it will just stretch.

@ARVash

Жыл бұрын

Strong disagree with Jonathan, I can think of long thin deformable things in machines that work for literal decades. Spring steel for example, leaf springs like this in firearms such as the sear spring in the 1911 last a very, very long time.

@planckstudios

Жыл бұрын

@@ARVash those are metal. I said when metal printing is more common, flexures will be more useful. Until then, most plastics will deform dramatically over time given heat and stress

@planckstudios

Жыл бұрын

@@andrewphillip8432 they won't register the same tension over time. Depending on the plastic, it can absorb water, degrade from UV, become more brittle over time - developing imperfections and differences between the springs

@johanness6545

Жыл бұрын

As you can read in the publicly available paper "Mechanism reliability of bistable compliant mechanisms considering degradation and uncertainties: Modeling and evaluation method", there are methods to evaluate the durability. Polymer compliant mechanisms can be designed to last for hundreds of thousands of cycles. Indeed metal parts can be more durable, however they are more expensive and difficult to manufacture. There also good examples of subtractive manufactured metal parts in compliant mechanisms (often wire EDM), e.g. the mirror positioning actuators on JWST

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