Roboticists Create Third Arm Gentle Enough to Pick up Fruit, Yet Capable of Punching Through a Wall

The arm has three degrees of freedom.
Loukia Papadopoulos
The photo credit line may appear like thisUniversité de Sherbrooke

Roboticists from Université de Sherbrooke in Canada have invented a waist-mounted remote-controlled hydraulic arm that can help you with gentle tasks while also possessing the strength to smash through walls, reported IEEE Spectrum. It's a true superhero's third arm and we are very excited about it!

RELATED: BREAKFAST MADE, SERVED BY DUAL ROBOTIC ARMS? YES, PLEASE! 

The goal of the novel new joint is to “mimic the performance of a human arm in a multitude of industrial and domestic applications.” It is known as a supernumerary robotic arm and it has three degrees of freedom.

It is hydraulic and actuated by magnetorheological clutches and hydrostatic transmissions. It's specially designed to provide a lot of power while minimizing how much mass the user has to wear.

It does this by connecting to the user through a tether. It weighs about the same as a real human arm (approximately 4 kilograms) but it can lift up to 5 kilograms.

For the time being, it is definitely not autonomous. The arm is controlled by a second human via a miniature handheld application.

Right now it functions as a co-worker: either performing the same task as the user in parallel or doing something different in order to free up the user to do stuff that requires more creativity.

Lead author Catherine Véronneau explained to IEEE Spectrum exactly what it feels like to wear the arm: "for now, it is still not too bad having this arm on my hips, since it’s only 4.2 kg (without payload) and it is located near my center of mass (to reduce inertia). I get used to it quickly, and I can compensate for some of the movements (x, y, and z translational movements), but I still have some remaining issues to compensate for torsion movements (like if the arm is hitting a tennis ball with a racket), which is funny! We also noticed that the harness needs to be rigidly connected to the body because if there is some backlash between the harness and the body, it can be uncomfortable."

I guess we're still a long way from having a true autonomous superhero's arm but at least we are heading in the right direction.

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