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Robot skeletons and armatures Robowaifu Technician 09/13/2019 (Fri) 11:26:51 No.200
What are the best designs and materials for creating a skeleton/framework for a mobile, life-sized gynoid robot?
This website may interest you.
Thanks anon(s). I'm researching both links now.

Interestingly, I was contemplating recently working on a controller solution for a single hand as a starter project using the BeagleBone Blue. That hand is pretty sweet.
This one is probably not an IRL artifact like yours but it kinda looks similar in design.
This design seems to work pretty well.
Outstanding anon(s). I've been puzzling over the hand for a while now. It's important to reduce the weight of everything, since it will sit on the end of a relatively long and complex lever itself (the arm). Yet it needs to be able to deliver a fairly sizable amount of force to function well as a humanlike hand. It's a complicated problem, and the hands we have are amazingly elegant and powerful designs. Good stuff, thanks.
Look up soft robots. I was inspired by this paradigm

The material is cheap and reusable (just remelt!) and it's a simple solution to complex actions such as picking an object up without crushing it. Normally with hard robots you need many sensors and it needs a big "brain" to calculate everything and the actuators need precision.

Think of evolution. invertebrates are simpler yet they still exist because although they are simple they are robust. Go this route.

If you want a mobile gynoid, the simplest way would to be to probably make it basically a 100% soft skeleton, like a hydro skeleton and soft pneumatic actuators. Then for structure add armored plated like an exoskeleton (this makes it look like a stereotypical sci-fi gynoid). Then for stability suspend it with a cable between it's shoulders. It needs power (electricity and compressed air) so it really shouldn't be a problem. It's very practical. I took a solder to my 100cm sex doll and ripped out the skeleton. I'm working on Posing it with pneumatics. Sex Dolls have stiff joints (so it doesn't recoil like a Biotrash ) and posing is a bitch. I'm hoping to fix these 2 problems. although It's too flexible at the moment without any skeleton at all.

For you, you can probably get away with a hollow inflatable Japanese sex doll as the outer layer for experimenting with the design before going all out. They are just under $200 dollars.

And you can use a 3d printer with flexible silicone threading to print soft actuators so you don't need to cast a mold for every experiment.

>inb4 robosquidwaifuhair full body jobs
Powered exoskeletons for construction workers are on the horizon, this from Makita's pending patents. We'll probably start seeing them sold around 2021.

A big development in soft robotics is the creation of flexible low powered pump that can be installed inside the robot
>The pump has a tube-shaped channel, 1mm in diameter, inside of which rows of electrodes are printed. The pump is filled with a dielectric liquid. When a voltage is applied, electrons jump from the electrodes to the liquid, giving some of the molecules an electrical charge. These molecules are subsequently attracted to other electrodes, pulling along the rest of the fluid through the tube with them. “We can speed up the flow by adjusting the electric field, yet it remains completely silent,” says Vito Cacucciolo, a post-doc at the LMTS and the lead author of the study.
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>Powered exoskeletons for construction workers
lol, i just discovered there's an Exoskeleton Report. didn't realize it was an industry on it's own.

That pump is surprising, thanks anon.
Anyone know of any good designs or prosthetics for artificial spines?
Hmm, good question but I can't say that I do myself. I imagine some sort of 'bionic' prosthetic design is used for the few patients that are being experimented on. Since the palliative approach to non-functioning spines would more or less by definition require a bipedal robotics solution, this is probably a very limited area of medical research right now, I imagine. The typical prescription is likely just to chuck the patient into a wheelchair and call it a day.

I hope we can manage something better here.

To my thinking, this is little more than just a fancy weight belt. It appears to have little to no active behavioral capacity, which a real exoskeleton would have. Still, good find anon. I think we can learn from the ergonomic and weight support design and the approach of wearing it could be very convenient for our robowaifus.
High-sensitivity (1 µG level resolution) solid-state accelerometer.
Could these designs lead to high-reliability body positional-awareness robowaifu systems? That is, strategically load the robo-armature up with these things all the way out to the fingertips and then integrate all the data using TensorFlow (or some other mathematical modeling system) to calculate the details of the waifu's body pose in realtime?
>To my thinking, this is little more than just a fancy weight belt. It appears to have little to no active behavioral capacity, which a real exoskeleton would have.
it seems to be a passive mobility suit more than an attempt at an exoskeleton, it seem to help the support by compressing air when bending over, just like how fat belly are used as spring by powerlifter when squatting.
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I've been looking at sex doll skeletons and they're all specifically designed for high pressure TPE injection, probably the same with silicone dolls since they're heat cured to save time. Doesn't seem like they'll be of much use in any robotics project and because of the manufacturing process adding automation in sex dolls is practically impossible.

It is a real exoskeleton even if it's soft and works passively using air resistance. Using the same principle inside a robot connected to the skeleton this design cuts down weight and applies mechanical leverage where and when you need it.

I've seen similar exoskeletons for the legs that use air inside pistons being tested by the US military to help soldiers carry weight.
Ahh, I see.

Fair enough. That's a cool looking armature anon. Got any more of it?
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>>707 Soft robotics is good for hands for robowaifus, also nether regions. Got to keep her sausage safe. A mix of hard and soft robotics is the ideal, for safety.
Just buy plastic skeleton and install appropriate mechanical joints between bones. Ball joints and bearings for efficiency. You could go classic and slap some lubricant between the original joints and have the skin hold the whole thing together. Polyurethane for the spine and other areas that need to be flexible but only acutely. They look to cost on average 200 American pesos. Just have to find someone selling a 4ft 10in cutie. Should hold up just fine as long as you're not abusive to your waifu you sick fuck. You could 3D print customized parts. I'm no skeleton expert but the main variability seems to be in the skull, hips, and ribcage.
>>1883 Whereas, using a human like skeleton has obvious advantages, the cheap plastic ones are really only good for wheelchair waifus. This mostly because altering the legs to the point of being able to use them for bipedal locomotion would require similar effort to building from scratch. Upper body seems like a great idea though. May be worth looking into.
>>1884 I had one class with a skeleton and I remember it being really durable. Considering that a real human skeleton is like 3 grand, I doubt someone is selling a quality skeleton made with composite materials. I might buy a skeleton just to see how it is because I found a shorter one for $90. If only the legs were the problem anons could spend a few hours reinforcing the tibia, fibia, and femur. I imagine the process would simply be cutting the bones down the middle and slapping the metal in the middle and screwing the sandwich together. We don't have to worry about compressive strength, just bending. There's also some 3D printing filaments that have glass fiber in them. Obviously not longchain but it might be good enough.
>>1887 Why not just use wood, plywood, plastic, fiberglass, etc? Common, cheap, durable, strong enough. Might be a bit heavy but I'm sure it will be fine.
Stolen from /doll/. Seems to be a rather simple design for the armature, probably could be scaled up into something fairly lightweight. Any thoughts on how to make this work for a ~140cm robowaifu? https://anon.cafe/doll/res/65.html#q152
>>1897 Wood isn't as strong as bone and tends to be heavier, so wood isn't a great option. Plastic could work, but no idea what type would be best. Plastic would likely be pretty cheap and could easily be sourced by recycling. What I find interesting is fiberglass. Woven fiberglass can actually be stronger than bone in every aspect while being cheaper and lighter. Fiberglass seems to be the most effective material for a frame. That said, not sure about the methods required for actually constructing the frame out of fiberglass, but it can't be too hard right?
>>4222 >but it can't be too hard right? It's not hard to do fiberglass layup, but it's a bit tricky and you need safety gear b/c, well, it's fine glass strands you're working with. I suppose you could make a structure that would be thin enough to not be too heavy (thick, strong fiberglass can be quite heavy, actually) but I'm inclined to think that 3D-printing two-layer shells is probably the best route for strength & weight ratios, within reasonable cost.
For very simple bots and prototypes plastic tubes connected with printed parts might be a good start. Plastic can be reinforced with carbonfiber: https://youtu.be/wN1AFG08P28 For the more advanced bots I would prefer not to use a human skeleton, but use a model of it and adapt it to the use case. Putting small steel rods into the center of some bones might be a good idea.
>>4230 It's a great idea to use tubes as structural components Anon. Since one of the important constraints we need to solve here is not only doing a functional range of robowaifus, but also to make at least some of them very inexpensive to produce, I researched using jumbo drinking-straws glued/taped together into triplets at a sort of strut. My initial experiments were really promising, with 30cm 'straw-struts' being able to support more than 2 kilograms of weight (vs. together they all weighed about 1.5g w/ glue & tape) in a vertical compression test. I don't remember when they failed, but it was probably double that mass. Total cost for that 3x strut: ~US$.12 (about a dime) purchased in a 500-pack. >t. Strawgirl Anon
Ok, but I aside of us going a bit OT here, I was more thinking of poolnoodles and such, as soft material for cheap and simple bots. Both, straws and foam might have issues with repeated stress, though.
>>4244 Pool noodles would be a great type of foam for areas that need to be semi-soft, and could serve as interstitial material for joints, etc. As far as stress factors with straws, etc., it really comes down to proper engineering. If you design the struts with triplets of straws well-adhered together, and you design the frame with triangular forms such that each force moment is inducing compression/tension instead of lateral forces on the individual struts then the design could conceivably last many years with care. Think racing machine space frames. Other materials could be found that would obviously be better suited, but when cost is a primary constraint (as it is with almost all of us) then these 3xStraw-struts may prove to be the cheapest (and lightest) form of construction resource available to us. I sure appreciate anons having concern for going off-topic, but we seem to be focused on Skeletons & Armatures in our current posts right?
>>4227 I remember reading that the strength of a toucan beak is extremely high considering its weight due to the hard exterior with a rigid interior. Bone works similarly if you take into account the spongier marrow compared to the harder collagen exterior. If we were to use a polyester resin and netted fiberglass shell filled with some sort of foam it would save on the price a bit while potentially still having comparable strength. This is turning into >>4230 anon's tube idea but with fiberglass resin instead of raw plastic. In fact, I'm curious how much stronger they'd be if the tubes were filled with a spongy material. Something to note is that plastics and resins have a terrible tensile strength. This is why they are usually supplemented with a fiber, which has an extremely high tensile strength. I doubt that using a raw plastic alone would be sufficient for a frame. Thus, finding the right fiber and the right resin in combination for the strength required is ideal. There are two main fibers I see as options: carbon fiber or fiber glass. Kevlar probably isn't worth it as it is still relatively expensive and isn't much better than fiber glass. If fiberglass isn't good enough, carbon fiber would be more cost effective than Kevlar. Carbon fiber is the strongest, but is also the more expensive. Carbon fiber seems to be around $7-9/lb. Fiber glass is still a comparably strong material, but carbon fiber can be made magnitudes stronger using the right resin. Fiber glass seems to be around $2-3/lb. Of course, fiber glass is also not very healthy to work with, as was pointed out, but if I'm making my robowaifu myself I don't mind the risk. Both are options, one is just more expensive.
>>4256 >Thus, finding the right fiber and the right resin in combination for the strength required is ideal. >Quality >Performance >Price -Pick any two Anon. Price is probably always an included factor for the first few years for us, unless some wealthy patron decides to take an interest in our dreams. Ergo, a decision must be made between: >Quality >Performance >but if I'm making my robowaifu myself I don't mind the risk I've actually worked doing automotive fiberglass. It's not really risky--unless you don't take safety precautions. You need: -Breathing protection, first and foremost. A respirator is best. -Skin protection. Gloves, long sleeves, etc. Take care removing your protective clothing before removing your respirator. This implies button-up shirts only, no t-shirts. Shower very well at the end of the day. Following these protocols and you should be fine. And yes, I bet foam-filled cores would be a great choice for the structures, even for the straw-frames.
>>4258 >You need: Duh, eye protection too ofc. 2nd only to breathing protection. my apologies
>>4246 Ah, I didn't really understand what armatures meant. I thought this thread was only about the skeleton. Printing PLA foam: https://youtu.be/2tmgzwgi2UI Gradient infill, which we could optionally fill with silicone maybe? https://youtu.be/hq53gsYREHU
>>4266 >what armatures meant Just think stop-motion puppets (which have numerous crossover with robotics concerns). > >sauce kineticarmatures.com/custom/ Thanks for the videos!
You're welcome. Had some more thoughts on this: The hollow parts in bones with gradient infill might also be used for cables, air transport, or signaling with lights. I've got bad experiences with broken cables on headphones, so I'd like to avoid bending cables. I thought the bones cold have metal parts at their joints, to be used for data transfer or electricity distribution, the cables or metal rods would be inside the bone. Alternatively, data transfer with light signaling, which might be less reliable, though. If a bot uses air pressure for air muscles, then bones might transport the air in some channel, so only smaller parts outside need to be sealed of while being flexible. This might even be usefull to stretch a extremity. Joints would be bendable without pressure inside, but not if there is pressure. Also unbend when the joints are filled with pressure. Even if it's not done that way, there's something else: Air muscles might make ugly noise bc pressure release. This might better happen within the bones, so it would be less noisy. Though with enough other material around this might not be so important.
>>4272 Those are all really good points Anon. I'll just say that I intend to route networking cabling through the struts bones. I imagine we could even manage Bowden cables for direct force transfer down them as well.
>>4273 I thought about this a bit, even if it isn't the main way for me to go. Do you think you could use bandages to press them together? To form a female looking leg. Some straws shorter at the ends to get a curvy thigh? Maybe a small pool noodle cut through in the middle or other foam for some extra curves? Then some Leggins as finish? Maybe a thin layer of silicone on top of that? Do you consider to put in some of the foam for molding into most straws, as a bit more expensive variant?
>>4388 >Do you think you could use bandages to press them together? If you mean simply to adhere them together, then I suppose so, yes. However a high-quality tape like Kapton would be my recommendation in that case, instead. >To form a female looking leg. Some straws shorter at the ends to get a curvy thigh? Maybe a small pool noodle cut through in the middle or other foam for some extra curves? Yes, that's one of the several nice advantages of jumbo drinking straws as structural support; they are inherently flexible. Also, you might investigate the mechanical-engineering concept of Tensegrity. Straws or other long flexible materials (even things like wooden skewers, for instance) can take advantage of this principal to notably increase their structural rigidity for only a small, incremental price increase. And the straws are intended only to be an internal, endoskeleton. After that, an Anon could create the outer shell from any reasonable (and lightweight) material he chooses. So yeah, pool noodle foam attached to the skeleton, and artfully carved and crafted could then be covered with a layer of silicone (be sure to use the type that will cure dry). And the idea of the injecting spray foam down into the straws for increased structural support should be relatively inexpensive, so it can probably be a part of even the most inexpensive models I'd imagine.
A thanks, now I get it. I'll look up Tensegrity as well. If they're only meant for the bones then putting foam inside of them might not be so useful, bc you might need at least some channels for cables. I just thought at first, you wanted to make the whole leg out of those straws.
>>4416 Glad to clarify it for you then. >bc you might need at least some channels for cables. You can run cables down the straws and then inject the spray foam if you'd care to, it will be easy enough to do. And ofc you can always leave central channels down the 'bones' that you don't inject foam into, and just do the outer parts instead. Cables can then be run down these central channels after the fact (of skeletal assembly).
Another interesting thread in Dollforum, here about skeletons: https://dollforum.com/forum/viewtopic.php?f=6&t=95936 Some takeaways: - TPE is what makes dolls heavy, not the skeleton. - Foam parts might be buoyant and this could be a problem if one wanted to to put them in the middle of a silicone molded part. - Mainly the problems are about skeletons breaking and them damaging other parts and breaking through. Though that's often the wires for posing, instead of muscles, which fembots shouldn't have. - Some bones also might need to be flexible (ribcage). - One problems for dolls also would be that they need to be poseable, staying in one position during use. If the had more flexible joints, they would collapse. Bots shouldn't have that problem, bc muscles/motors. - Also, dolls apparently don't loosen up around their pelvis when being used for bed gymnastics, unlike females. Let's keep this in mind.
>>4547 >- Also, dolls apparently don't loosen up around their pelvis when being used for bed gymnastics, unlike females. Let's keep this in mind. Kek'd. OK will do Anon. Thanks for all the updates BTW.
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Looking into this thread really motivates me to pick up learning CAD again: https://dollforum.com/forum/viewtopic.php?f=6&t=105309 One guy build a spine with a airmuscle for his "doll". It's vaguely how I imagined it. I'd like to try something similar. He also has a YT channel, but his videos are really weird, bc he's combining his robots movements with some animation and sound from movies: https://www.youtube.com/channel/UCKOlO5xVrL5GW5kiEsGvLYg
>>4563 Very nice. Guy's obviously a clever designer. Please keep us updated on your project's progress Anon.
I'm looking into parts of already existing robot projects, and how useable they are. I'm currently looking into InMoov, including remixes. The first picture shows a more traditional design, printed by me in white PLA. The "tower" on the left is a piston, it's like a screw inside a tube. Connected to a motor, it could move the head. Of course there would be others on the sides. The pictures after that show a newer design. It cought my eye because it was used for a bot with a familiar look... The spine seem to be from here: https://www.thingiverse.com/thing:2059967 Kyle Campbell building it: https://www.youtube.com/watch?v=heYThvTCOMU https://www.youtube.com/watch?v=gGwGW-JlC80 http://www.drupp.eu/inmoov.html This guy here seems to be much into improving InMoov: https://www.thingiverse.com/ambroise/ Then there's a spine and other skeleton parts by Fernando Gomez: https://youtu.be/OCwrFUHSqpQ - He seems. To build his own robot (Dara) with very human like skeleton. But on Thingiverse, he has a another name, or I'm confused, or these are two people and this here is the original source: https://www.thingiverse.com/willy1067/designs
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Also had some images from Twitter, where I don't recall the source. But they might be useful to look at. I think at least one of the sources was mentioned somewhere else here in the forum. Maybe here: >>366 or in the link below. There are some guys building dancing little bots on Twitter. You know, like these Danny Choo waifus were supposed to work: >>245 and the pics are from one of them.
>>5327 I think the classic linear-actuator you built is very useful. I'm interested to see how the three-arm pivot joint performs over long duty cycles. Interesting stuff.
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@ExRobots is also really pushing forward: https://nitter.net/ExRobots1/status/1301083155458334721#m I like how lean this arm is, unlike so many others they don't make them bulky. Also posting some pics which might be educational.
>>5364 effin impressive tbh. best abdomen/legs complex i've seen to date. i wonder it there are connections there w/ boston dynamics?
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I found out an image from a while ago about a Asuka doll, her joints and esthetics are very interesting. I wonder if they can be powered because the range of movement is impressive. The only thing i could find was from a Japanese website: website:http://sansogyorai00.blog54.fc2.com/blog-entry-9.html Is there more info on such joints?
>>7422 I've never seen such an elaborate papier mâché style model before. The more recent blog post of his has higher resolution images but it's difficult to tell what the joints are made of. If I had to guess it might be custom joints based on the ones used in 1/12 scale model gundam & evangelion kits. But according to his site everything is 100% custom and of his own design; 私は電力を必要とする機械器械道具を使いません 紙以外の素材も一切使用していません 全て脳内設計と 完全な手作業のみで製作しました。 I don't use machines, instruments, tools that require power. No materials other than paper are used It's all about brain design It was made only by complete handwork.
>>7425 Neat, thanks.
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Here are some examples for different joints in the thread about ball jointed dolls >>7625 including pics related. Originally from https://anon.cafe/toy/res/4.html#4 via >>5531. >LIMS2-AMBIDEX arm joint discussion >>7619 First foot/ankle joint for Elfdroid Sophie >>7631
>>7634 Makes me wonder if we can't just start from an oversized action-figure toy and transform it into a robot.
>>7636 You would still need to redesign the parts to make them hollow for the motors, cables, batteries, additional gears, private parts, heat distribution / cooling ... later you want more sensors... It's certainly a good way to think about it, though.
>>7637 Yes I suppose that's the case. But probably not a lot more to do than would be necessary anyway and some of the shell's design work would already be done. I suppose the main issue at first would simply be finding a figure large enough/reasonably priced enough. I wonder how difficult it would be to make a mold from one and then make casts (is that what it's called?) from them. Kind of spreads the cost out a bit that way I imagine.
>>7639 If this already existing model would not be a attractive female, then I'm quite sure that changing the outsides and insides of every part would be more difficult than designing it from scratch. It is also better to have the parts in a CAD file than just the modeled mesh, since changing something is easier that way. But such models of dolls or toys are rather designed by 3D sculpting, not by using parametric design (CAD). Makes probably more sense if only the outside matters and later changes were only small. Also, I think making big molds only pays of for some repeated production over several iterations. Silicone rubber on that scale is quite expensive, even the one which isn't medically safe. People share srt files and CAD file formats, instead of using molds, for a reason. That also avoids shipping cost. Dependent on the country it might also be risky, if the parts could be interpreted as looking child-like but would also contain certain orifices. I don't want to discourage you to much though, one might be able to create a set for others, so they can buy and build a female looking robot that way. Produced at one place and shipped to the customers, which would customize them.
>>7640 Makes sense, thank you.
>>7641 You're welcome. I'm benefiting from good conversations as well, thank you. I wanted to add a conclusion that came to me later, which is, that starting a project to build a robowaifu body by creating a toy model first might actually be a good idea. Then the files could be parametric, the design of the toy model would be less complex, but then additional complexity could be added to it later on.
>>7651 >Then the files could be parametric Does that mean they're highly precise, or is there more to it? >the design of the toy model would be less complex, but then additional complexity could be added to it later on. One of the good things about this is that the robowaifu could easily be in different models and features and the cost of building her could be very different from the least to most complicated I think.
>>7661 >>Then the files could be parametric >Does that mean they're highly precise, or is there more to it? It means they can be changed by changing numbers, instead of sculpting the 3D surface (mesh). For a face or something with a complex form, sculpting might be better, which is more like working with clay. But many other parts don't have that many variations in their surface, and so they can be created with CAD. Which means you make a 2D drawing and then it becomes 3D, while you can still change the parameters. > One of the good things about this is that the robowaifu could easily be in different models and features and the cost of building her could be very different from the least to most complicated I think. Yes, seems to be a reasonable assumption.
>>7674 Ahh, I see. I've dabbled with Blender a little bit creating simple mesh objects. Seems like parametric would be better for mechanical things. Obviously that's going to be important to us. Thanks for taking the time to explain the differences anon.
>>7709 and follow ups are related to skeletons. Pics in the project dump thread, came from https://nitter.net/hamcat_mqq
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>>7722 Should probably dump some here as well, with focus on general skeleton.
>>7723 This guy makes some incredible dolls. Best DIY that I've ever seen. His 3D printer must be calibrated perfectly! I experimented with ball joints a lot about 2 years ago and they were always floppy, especially if you added much weight onto one end of the limb. So the fact he is able to make a doll that can stand on one leg is amazing! Is any of this going to be open-source though?
>>7727 >Is any of this going to be open-source though? I second this question.
>>7727 >ball joints ...were always floppy, especially if you added much weight onto one end of the limb I'm looking forward to find out myself about that. >Is any ... open-source though? My browser offered translation, but didn't look into it yet. The inspiration is more important to me right now. Would need to be in a usable CAD file format anyways, and then skills to adept it to the way one wants to build a bot out of it. I'd like to learn to do this on my own. Then the rest should be easier. Hopefully I'm going to do so, soon.
I'd like to try some tests with a special composite aluminum panel called 'Hylite' but finding this material is next to impossible. From the reviews I've seen on some consumer products that use it(ergonomic folding laptop holders) and a 3d printer called Zatsit that appeared on kickstarter but seemed to have gone nowhere this might be the perfect material for building lightweight robotic frames with built in joints. There were some samples sold on ebay several years back but they're not there anymore. One store in the UK still sells it but they don't ship internationally, it may have been the same seller on ebay. >>7762 You wouldn't necessarily need those files if the pictures released publicly are detailed enough to reverse engineer. When I first saw the eye movement mechanism here >>7725 I immediately tried to figure out how it worked but it took me awhile as the belt on the motor was the same color as everything else. The perspective also threw me off a bit. But there's enough there to recreate it. He's probably using TPU or TPE filament for the outside of the ball so it's constantly gripping properly inside the joint. Would also explain why they're black. Would be fine for a doll that you'd want to pose but for a robot all that friction would make it difficult to have smooth movements. I'd try using high friction silicon tape instead of TPU/TPE in this situation as it's much cheaper.
>>7762 >I'd like to learn to do this on my own. That's admirable, but I'd suggest you not be too bull-headed about that. Always good to stretch yourself, but it's always wisdom to be aware of your limits and get the help you need when you need. Over time you might find you need less and less as you go along. >>7764 >Hylite Sounds very interesting. Please let us know if you ever come across this Anon. >I'd try using high friction silicon tape instead of TPU/TPE in this situation as it's much cheaper. You know, that idea made me think of something else. What if one created a tight-gripping ball joint at manufacture, but then disassembled it again and worked regular Plumber's Teflon tape thoroughly into both surfaces inside the ball joint? Perhaps it would be both smooth enough and 'grippy' enough at the same time then.
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>>7769 I know that skilled BJD makers use a process (I forget exactly what they call it) where they cut out small disks or squares of coarse denim material and stick them onto both contact surfaces of each ball joint. This provides a lot more friction in the joint, enabling their dolls to hold complex poses more easily, without needing the elastic to be so tightly strung.
>>7772 That's definitely an idea I'd like to explore Anon, thanks!
>>7764 Yes, I also thought if these joints were not stable one could put something into them. The eye mechanism wasn't what I was thinking about when stating that it probably wasn't open source. I think I saw a link in the tweet about it, also I wasn't convinced that the eye mechanism was something special. This might just be like some which is even available as files. Though, it seems to be more compact than others. The skeleton is what is certainly spacial about this "doll" (we're in the skeleton thread...). That's what needs to become accessible as CAD.
>>7769 >>7772 What if you tried both the Teflon and the Denim together at the same time? Anyone tried that yet tbh?
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>>7425 If he didn't use powered tools or machinery, there's a good chance that he simply used glue, scissors, and/or a hobby knife. You can harden paper using epoxy. https://youtu.be/nLhJcIqZv7Q is an example. What boggles my mind is the fact that he managed to create such intricate details using so many individual pieces! Dude practically learned 8th dimensional origami to do what he did. Based on the limbs in the foreground, as well as the puzzle-like sections outlined in what is likely (and hopefully) glue, there was much trial and error involved in the process.
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>>8062 Sorry, but I don't see the reasoning behind this approach. She looks like th creation of a deranged mind. I worked with paper mache myself, and build round forms. The problem was getting the parts to be symmetric, though. >>4429
Guy is a master at creating hinges using wooden dowelling and cardstock! Particularly impressive are the photos where some of her joints appear to be holding a pose. Floppy, loose joints are a big challenge to overcome when designing a doll...and to pull it off using such materials is amazing! (The movable "breasts" are a nice idea...although I can't say I'm a fan of those spikey nipples).
>>8071 >Guy is a master at creating hinges using wooden dowelling and cardstock More details? I'm not quite sure what you are referring to Anon.
>>8070 She definitely needs a can of spray-paint, but I think it would look quite beautiful after a little preparation. >>8071 is right about those nipples, though. What about the design looks unreasonable? It has three distinct layers, according to the author, and offers great posing options and articulation. It's great for the people designing it because the parts are easily sorted, and it's great as an end product because of the relatively few resources required to make it. I'm not saying we should use paper or anything, but a plastic equivalent should be quite cheap. Honestly, I'm thinking about picking up a 3D Printing software just to try to make these parts on my own. Not that I would know where to start...
>>8071 I don't think he even used dowelling. If you look close, the rods appear to be made of rolled up paper hardened into a plastic-like substance. I bet he used a doll of some sort in order to shape his pieces. He did make some improvements to the base shape. Look at the feet, for example. The bottommost layer of her sole extends past the foot, restricting the movement of the doll to a reasonable degree. Just brilliant!
>>8083 >Not that I would know where to start... If I am ever struggling with how to start designing a part then I literally break the complicated shape up into smaller, simpler 3D shapes. Like a hand becomes a load of cuboids and cylinders. Any fancy or complicated rounding, bevelling and chamfering I leave until last.
>>8083 >I'm not saying we should use paper or anything, Actually, not only do I think that's not a bad idea as an underlying form (along with thin foam) upon which to build up layers of hard shell over it >For a real life example of this design look at how modern light weight bike helmets are made. >>7980 but I'm actually using cardstock in my preliminary design work now. Over a lightweight tubular tensegrity space-framed chassis, paper makes an excellent type of light, cheap, and easily modifiable underlying substrate. Very quick, cheap and easy to mock up design shapes, and then to use it to build up the hard shell over. >(BTW, we have a papercraft waifu thread >>271 , though it hasn't been repopulated yet after the migration here).
If you are okay how this design looks (>>8062), then you should consider yourselves glad, since designing a body shape like this is probably much easier than designing human-like bones and a mold for a silicone body. On the other hand, if you want to use cardboard or paper because you can't afford a printer and the 12-14$ for a kilo of plastics, then that's another story. >>8083 >>414 is the thread for CAD. That basics are easier to learn than you might think, just a bit of frustration tolerance might be necessary, since some errors and problems might be confusing at the beginning. It also does not need a great computer, Solvespace for example runs on a Raspi3 and FreeCAD is also in the repository. Sculpting needs more resources, which is one reason more not to confuse those two. You''ll probably going to need that for the face.
>>8093 >On the other hand, if you want to use cardboard or paper because you can't afford a printer and the 12-14$ for a kilo of plastics, then that's another story. While I myself can manage that I have both already, I'm explicitly spending time years now, lol thinking through and working on kit designs that will be highly inexpensive and easy to assemble even for kids. This is how robowaifus will jailbreak the system, and escape the globohomo corporate stranglehold and escape into the free world. Everyone here do as you see fit, ofc, but I'd advise all of us to at the least consider these issues. Thanks for the good advice btw, Anon.
>>8096 >kit designs that will be highly inexpensive and easy to assemble even for kids I do consider this, nearly put it into the other comment, but left it out at the end. I also think that it would be great to have something in case our technological society has some breakdown or something for all the very poor men in poor countries. The later doesn't even need to be driven by compassion for those men, but by the hope to lower the birthrates in such places (while "middle-class people" in wealthier countries might even have more kids again, thanks to more advanced robowaifus and -nannies). However, I think it is highly unlikely that plastics and mass production of parts will go away anytime soon, currently even poor people in poor countries are flooded with them.
>>8098 Good points Anon. I have to agree with them all tbh.

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