วีดีโอ

I mean that is just typical lab procedure but heat treatment would also make the metal coil inside fairly hot also

No - this is unpublished work.

The silver coated nylon yarn we used here was around 0.2 mm in diameter and we have used the coiled muscles made from these yarns for many thousands of cycles without any problems.

@@BionicMuscles Thank you for the reply. I appreciate it.

I'm sorry but I have an another question. I tried making artificial muscles at home. The length of the nylon was 1m and the thickness was 0.2mm. And I made a 20cm coil out of nylon. The coil was then heated to 180 °C in an oven for 1 hour. Those coils boasted significant shrinkage. We also compared the calculated and actual values ​​using the linear equilibrium coefficient of nylon. However, the calculated value was much smaller than the actual value. so, can you explain the physical principle behind the coil?

@@SinWonMiSang The coils shrink in length because heating causes the fibre that makes up the coil to untwist. When this happens the length of the coil reduces. This is the same phenomenon that occurs during the stretching of a coiled wire spring: the wire actually twists as the spring is stretched. You can see the fibre untwist on heating by making a sample from fishing line and twisting it until just before coiling. If you then heat-set this twisted fibre you will trap in the twist. Next, if you heat and cool this fibre you will see it untwist on heating and re-twist on cooling.

Tesla knows all about it, as does everyone else in the industry: th-cam.com/video/9XLw_cNwV88/w-d-xo.html

Hi Joe- operating these muscles is really simple. Just supply DC electrical power from a battery or similar. The more volts you put in the faster the muscle will contract. Cooling occurs when the power is turned off, although it can be slow. We typically use around 10V to heat up a muscle that is around 6cm in length and it contracts in 10 seconds or so. Note that they will get very hot- up to 150 degrees Celcius or more if you leave the power on. You can play around with different voltages to suit your needs. Best of luck with your project.

@@BionicMuscles oh too bad it’s so slow. For robots you need it to contract and relax in tenths of a second. Any way to make it snappier?.

@@k1ng401 We have made really thin fibres into coils by teasing out individual filaments from multifilament polyester yarns and then twisting and coiling them. They do contract and expand very rapidly but you would need many thousands operating together to generate high forces

@@BionicMuscles do you use a correspondingly thinner conductive thread when you do that or have you contined to use the same silver coated nylon you used here?

We are not aware of any other suppliers for the silver coated nylon yarn. However, as an alternative approach we know that others have had success by first making coils from ordinary fishing line and then over-wrapping the coiled fishing line with a thin copper wire. Its best to wrap the copper wire in the opposite direction to the coil.

now whose fault is it for being distracted by a mere coat.

Maybe you have Attention Deficit Disorder? While I noticed the lab coat was a bit large, it in no way distracted me from the information what was being put forth. Regardless, if her lab coat distracted you to the point that you were unable to pay attention to the video, you should consider seeing a doctor. There are some who simply cannot learn in a classroom because they can only focus on the teacher/professor's hair, clothes, speaking style, etc., despite none of it being relevant to the course material. I can only imagine how difficult life must be for people with these types of focus issues. I know there are medications that can help though, so do consider seeing your doctor. Best regards.

you sir... are a genius

@@wiredvibe1678 a year later, wow this actually sounds smart. Was I actually understanding diagrams? Wild I don’t remember making this comment

@@awlomthesheepermen you are right. I have seen some other videos where people have tried twisting the actuators. And various other things to improve the strain... but honestly these things have massive range of movement compared to our muscles. Also, I haven't found anyone trying to abstract how our system of muscles work to move our limbs. Either they seem to be trying to recreate it 1:1 or not at all. Anyways I'm excited to see what I can build with these actuators!

@@wiredvibe1678 hey I just like learning about stuff, but hey maybe if you are building stuff you should try making a video talking about what you’re trying to build and your idea and process, it would be a very fascinating

@@wiredvibe1678 anyways yeah this whole field is so cool, I hope you make something cool. I’m not in engineering, I just do dishes at a restaurant

The maximum contraction depends on the coil geometry and can be as high as 80% for large diameter coils. If you can access the figures of the original report (DOI: 10.1126/science.1246906) then you'll see from Fig. 2 that the contraction is set by the coiling conditions and the contraction is quite stable for a range of applied loads above a certain threshold.

We generally apply around 1 W of electrical power per 5 cm length of muscle. This heats (and contracts) the muscle in a few seconds. The actual voltage applied depends on the sample length, but we typically use around 0.5 - 1 V per 1 cm length of muscle.

Indian I think. Why?

@@jordyv.703 she looks like my aunt

@@short207 She is Sri Lankan

For that to happen it must be used by someone thinking like you :)

Too inefficient

Ping pong