Sticky feet could help robots land on asteroids



 Sticky feet could help robots land on asteroids 	Washington: A new biologically inspired robot could one day crawl over the surface of an asteroid or Mars and gather samples for study using lots of tiny, mechanical “toes.”

Asteroids have a weak gravitional pull, which makes it difficult for a robot probe to drive or walk across the rock.

Now, a robotics researcher at the Jet Propulsion Laboratory in Pasadena, California, has created super-gripping feet that could secure a robot and make asteriod mining possible.

Aaron Parness recently presented his gripper at the Institute for Electrical and Electronics Engineers (IEEE) annual robotics conference, IEEE's Spectrum magazine reported.

NASA and other countries' space agencies have sent several missions to observe asteroids. So far, however, NASA spacecraft haven't directly gathered samples from an asteroid.

Parness' robotic feet would allow asteroid probes to cling to the surface of even small asteroids, whose weaker gravitational pull might put a traditional rolling or walking probe at risk of “accidentally jettisoning itself into space,” the Discovery News quoted Parness as writing in a paper.

A future Mars or other planetary mission might also use a sticky-footed robot to scale cliffs, Parness added.

One of the robotic feet Parness created consists of 16 fat, stubby toes arranged in a circle. Each toe has 12 “microspines,” tiny steel hooks attached to a flexible suspension system. When the foot drags its microspines over the slightly rough surface of a rock, the hooks can attach to small dips or protrusions on the rock surface.

Parness' tests showed his robotic feet could resist more than 100 Newtons, a unit of force. They could probably resist more, he wrote, but right now, the test consists of having someone use a robot foot to pick rocks up from the ground, so he's limited by the strongest person he can recruit to help. He's working on creating a machine to test heavier rocks, he wrote.

He also found the foot can hold a drill to a basalt rock, boring out a sample half an inch (12 millimeters) in diameter which, during a mission, a probe could analyze or send back to Earth. The gripping drill works in several positions, including upside down and sticking straight out the side of the rock.

ANI