For a number of reasons, the right-angle joints make the robot operate in a more natural state. "We found that, if we put the motor on the joint directly, we encountered some odd mass distribution problems, whereas, by using the right-angle motor/gearhead assemblies... we didn't see that happening. Plus, the assembly helped with the location of the proper center of gravity for the robot itself," Ames said.
With the proper joint assemblies, the components acted in a very predictable manner, which was essential when creating the control interface. "You want everything to move exactly as the mathematics and control software dictates," Ames said. The assembly allowed for the high-torque motor to operate smoothly at slow speeds. The team installed larger sprockets and a chain for each of the six joints. The idea was that the chain would become the weakest link -- like tendons -- and would be less expensive to replace.
The team is working toward surpassing the ability of wheeled robots, by focusing on collected data that shows that humans display a walking behavior that mirrors a mass-spring damper system, which is one of the simplest mechanical systems. The team is now on the path to replicating that system by using a combination of motors and gearheads, along with proprietary electronics, which means that the AMBER 2 robot is well on its way to being one of the first dynamically walking robots in the world.
Boston Dynamics does indeed deserve their excellent rep. But the answers to why are more mundane: a) They had military funding way before most other robot companies, and b) they had the foresight to start working on biomimicry in robotics before anyone else. They've also been really good at operating in stealth mode under the radar.
Thanks for the video Cabe. I just spent the last 30 minutes perusing the Boston Dynamics website. Unbelieveable! It's here, now. NOW watching the movie "iRobot" doesn't seem so much like fantasy as it does a peek into the future.
New versions of BASF's Ecovio line are both compostable and designed for either injection molding or thermoforming. These combinations are becoming more common for the single-use bioplastics used in food service and food packaging applications, but are still not widely available.
At the Design News webinar on June 27, learn all about aluminum extrusion: designing the right shape so it costs the least, is simplest to manufacture, and best fits the application's structural requirements.
For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This radio show will show what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.