The December 2022 issue of IEEE Spectrum is here!

Close bar

Jamming Robot Gripper Learns to Throw Stuff, Humans Surrender

I bet you didn't think it was possible for a balloon filled with coffee grounds to shoot hoops and play darts, did you?

2 min read
Jamming Robot Gripper Learns to Throw Stuff, Humans Surrender

That squishy dollop of brilliance that is the jamming robot gripper has learned a new trick: Roboticists at Cornell and the University of Chicago have taught it to throw stuff.

A quick refresher: The gripper is simply a latex balloon filled with coffee grounds. The grounds move around each other like grains of sand and can conform to objects and complex surfaces, but when air is pumped out of the balloon, the grounds all "jam" together into a solid mass, yielding a strong hold on whatever the gripper is in contact with. It's simple, it's cheap, and you can pick up just about anything without having to calculate optimal grasping points or do anything else in the way of sensing or computation: You really just stuff the gripper against an object, pump the air out, and off you go.

This new "shooting" trick (or "fast ejection," if you prefer) comes from rapidly re-inflating the gripper with air. It sounds simple enough, but what you don't expect is the repeatable long-range accuracy, good enough to shoot baskets, sort hardware, and play a better game of darts than I ever have:

The researchers say that the precision they can achieve is ±60 mm with 95 percent confidence in the direction perpendicular to flight, which "is certainly too coarse for high-precision manufacturing tasks but could be useful for tasks like sorting objects into bins in a factory or throwing away trash in a home." It's obviously good enough for winning games of mini-basketball and playing horizontal darts, and it's kinda fun to picture what other tasks a talented throwing robot might do around the house: say, making a sandwich, or unloading the dishwasher, handy stuff like that.

You can get more details in a pre-print edition of the paper (which will appear in IEEE Transactions on Robotics), here

[ Cornell Creative Machines Lab ]

The Conversation (0)

The Bionic-Hand Arms Race

The prosthetics industry is too focused on high-tech limbs that are complicated, costly, and often impractical

12 min read
A photograph of a young woman with brown eyes and neck length hair dyed rose gold sits at a white table. In one hand she holds a carbon fiber robotic arm and hand. Her other arm ends near her elbow. Her short sleeve shirt has a pattern on it of illustrated hands.

The author, Britt Young, holding her Ottobock bebionic bionic arm.

Gabriela Hasbun. Makeup: Maria Nguyen for MAC cosmetics; Hair: Joan Laqui for Living Proof

In Jules Verne’s 1865 novel From the Earth to the Moon, members of the fictitious Baltimore Gun Club, all disabled Civil War veterans, restlessly search for a new enemy to conquer. They had spent the war innovating new, deadlier weaponry. By the war’s end, with “not quite one arm between four persons, and exactly two legs between six,” these self-taught amputee-weaponsmiths decide to repurpose their skills toward a new projectile: a rocket ship.

The story of the Baltimore Gun Club propelling themselves to the moon is about the extraordinary masculine power of the veteran, who doesn’t simply “overcome” his disability; he derives power and ambition from it. Their “crutches, wooden legs, artificial arms, steel hooks, caoutchouc [rubber] jaws, silver craniums [and] platinum noses” don’t play leading roles in their personalities—they are merely tools on their bodies. These piecemeal men are unlikely crusaders of invention with an even more unlikely mission. And yet who better to design the next great leap in technology than men remade by technology themselves?

Keep Reading ↓Show less