/robowaifu/ - DIY Robot Wives

Advancing robotics to a point where anime catgrill meidos in tiny miniskirts are a reality.

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Robotics Hardware General Robowaifu Technician 09/10/2019 (Tue) 06:21:04 No.81
Servos, Actuators, Structural, Mechatronics, etc.

You can't build a robot without robot parts tbh. Please post good resources for obtaining or constructing them.

www.servocity.com/
https://archive.is/Vdd1P
>>81 Small pneumatic or hydraulic actuators are becoming the biggest issue I can find. The only small ones I seem to find have very limited pressure.
>>4275 Do you think something like a screw-drive & rack-drive linear actuator could serve in place of a hydraulic one Anon? There are several linear actuators in different sizes readily available. They are electrically-driven ofc. Some can produce quite a bit of force.
Apologies if this video has already been posted, but I found it fascinating and liberating to get a glimpse of how many experts and just how much testing it takes to get a humanoid robot working properly. Boston Dynamics employs around 300 people. In this video just over a dozen are shown. That should give an idea of just how much work goes into this. https://youtu.be/EezdinoG4mk
>>12473 Neat, thanks SophieDev. I feel reasonably confident saying I don't believe this video has been posted here before. Very interesting. I think it's absolutely amazing that we here are going to make better humanoid robots, on a shoe-string budget, from a small group of robowaifu-pioneering Anons. Ours will eventually be with men all over the world, while theirs will stay limited to govt. institutions only. Their multi-billion dollar conglomerate loaded with highly-paid, highly-educated engineers and designers (and absolutely drenched in the Globohomo Big Tech/Gov) vs. our merry little band of adventurers. Real life Robin Hood-tier stuff -- it will be glorious! :^) ONWARD ANONS!
>>81 Really cool cheap yet powerful stepper servo desigh. https://youtu.be/a1sZSIDxpfg
>>12473 >>12483 That does looks cool Anon. I'll download the video and have a look at it. Are there any other links to go along with it do you know (hackaday, instructables, etc)?
>>12488 --write-description option in youtube-dl will write the text coming with the video. Otherwise look at the page or in the app. I aw the video before, it's fascinating, but it might not be so great for a compliant humanoid robot, because these sun gears with high reduction ratio are not backdriveable. Otherwise it would fit better in the thread for actuators. This thread here seem to only exist for other robots than waifus. >>12473 Thanks, but this should be moved to >>374
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>>17213 Posting in this thread now. I am attempting to make a silicone sensor while avoiding patent infringement. It appears that every possible patent is either expired, abandoned, or not applicable, so I'll proceed. So far I have created this giant mess. >pic related
I have a couple questions. 1. Would it be feasible to simulate muscles by twisting chords using electric motors to shorten them, or simply reeling up cable/chord? 2. If so, would pairs of these "muscles" working opposite each other, like biceps and triceps, be able to regenerate electricity as one pulled against the other to unwind/unreel against the opposing motor? Obviously there would still be energy loss but could you reduce the loss by using motors as regenerators? I'm asking because I had a weird dream after learning about Iceland's giant wooden puppet where there was a wooden doll that moved using twisting chords as muscles. It obviously looked feasible in my dream but my dreams are often retarded.
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>>17428 power could just as simply go into pulling along a single axis. The "twisting" just introduces a gear ratio effect. That being said, I've been really keen on the idea of recouping kinetic energy as electrical via opposing actuators, like you speak of here. My own design was something like a solenoid, the opposing actuator could induce a charge with much like a braking system will recoup some kinetic energy as charge. (Note that you won't perfectly conserve energy b/c if the arm for example were to lift an object it would have to exert additional "X" force to recoup "(X energy * efficiency coefficient) - friction". HOWEVER: if the robot is merely moving its own body in space and returns to more or less the original state, there's no reason recouping some charge wouldn't work. Example: you swing your arm forward, it swings back and returns to the same position. (If I'm wrong here please feel free to explain how) pic somewhat related: design for translation of oblique movement of actuator to linear movement, perpendicular to the axis of the "joint"
>>17429 I like your sketch Anon.
>1. Would it be feasible to simulate muscles by twisting chords using electric motors to shorten them, or simply reeling up cable/chord? Sounds doable. I've been trying my hand on a similar design. >2. If so, would pairs of these "muscles" working opposite each other, like biceps and triceps, be able to regenerate electricity as one pulled against the other to unwind/unreel against the opposing motor? Obviously there would still be energy loss but could you reduce the loss by using motors as regenerators? Wouldn't work. Any energy the relaxed engine would generate would be extra energy the engine under current would consume. The reason stuff like regenerative breaking works for EVs is because you're taking energy from the wheels while you don't want the wheels to spin.

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