4 ms·

you bring shame to the world of robots! there are humans that can achieve 100% notes. mere, humans!

nik12795 6y ago
Hahaha
Robotbeat 6y ago
Honestly, I think people underestimate how good humans are mechanically. Like, a human arm is a 7 degree of freedom arm capable of incredibly fast motion. Some of the songs on Beat Saber, on Expert Plus, are effectively impossible for any existing 7 axis serial robot arms to actuate fast enough to equal the best human players if you strapped VR controllers to where the end effectors are. Maybe some sort of parallel robot (like a SCARA) robot could do it. Two robot arms with 7 degrees of freedom (the extra degree to allow them to avoid colliding with each other), plus the camera has to also move to avoid obstacles. It'd be really tough to beat the best human players, from a mechanical point of view. You'd need custom robots. https://www.youtube.com/watch?v=LLb7cLTrSCE https://www.youtube.com/watch?v=LLb7cLTrSCE
- kortex 6y ago
  Not only that, but each arm can produce dozens of newton-meters of torque, with possibly sub-millimeter precision, and like you said, fast. Just building an arm with comparable specs is quite the challenge. You end up needing hydraulics because even the finest, most expensive transmissions with belts to move the motors closer to the body, still end up being too heavy to achieve human agility+strength. I looked into building a robot arm which could cook breakfast. It's almost ludicrous just speccing out the torque requirements to pick up a skillet. You end up having to pick harmonic drives and less speed but more stiffness, or hydraulics, which are lighter, but messy, less stiff (can be both good and bad) and less reproducible.
  - Robotbeat 6y ago
    Yup. I think people also underestimate how much Boston Dynamics benefitted from using high performance hydraulics for some of their more impressive robot demos (vs others that relied on more conventional electric robotic actuators).

Hahaha

Honestly, I think people underestimate how good humans are mechanically. Like, a human arm is a 7 degree of freedom arm capable of incredibly fast motion. Some of the songs on Beat Saber, on Expert Plus, are effectively impossible for any existing 7 axis serial robot arms to actuate fast enough to equal the best human players if you strapped VR controllers to where the end effectors are. Maybe some sort of parallel robot (like a SCARA) robot could do it. Two robot arms with 7 degrees of freedom (the extra degree to allow them to avoid colliding with each other), plus the camera has to also move to avoid obstacles. It'd be really tough to beat the best human players, from a mechanical point of view. You'd need custom robots. https://www.youtube.com/watch?v=LLb7cLTrSCE https://www.youtube.com/watch?v=LLb7cLTrSCE

kortex 6y ago
Not only that, but each arm can produce dozens of newton-meters of torque, with possibly sub-millimeter precision, and like you said, fast. Just building an arm with comparable specs is quite the challenge. You end up needing hydraulics because even the finest, most expensive transmissions with belts to move the motors closer to the body, still end up being too heavy to achieve human agility+strength. I looked into building a robot arm which could cook breakfast. It's almost ludicrous just speccing out the torque requirements to pick up a skillet. You end up having to pick harmonic drives and less speed but more stiffness, or hydraulics, which are lighter, but messy, less stiff (can be both good and bad) and less reproducible.
- Robotbeat 6y ago
  Yup. I think people also underestimate how much Boston Dynamics benefitted from using high performance hydraulics for some of their more impressive robot demos (vs others that relied on more conventional electric robotic actuators).