The quest for robotic hands: A challenging journey towards human-like dexterity
In the world of robotics, one of the most intriguing yet challenging aspects is the development of robotic hands. These hands, with their intricate movements and precision, are the key to unlocking the potential of humanoid robots navigating our human-centric world.
Imagine a world where robots can seamlessly interact with the tools and devices designed for human hands. It's a vision that has captivated the minds of roboticists for decades, but it's a vision that has proven incredibly difficult to realize.
The Hardest Part of Any Humanoid Robot
Bren Pierce, the founder of Kinisi, a robotics startup based in Bristol, puts it bluntly: "I think the hand is the hardest, most complex part of any humanoid robot."
And here's where it gets controversial. While some dream of a single, versatile robot hand to rule them all, the reality is far more complex. Ten of Kinisi's KR1 robots are undergoing trials, each equipped with different grippers for specific tasks. From strong "gorilla" pincers for heavy lifting to delicate suction devices for handling fragile items, these robots showcase the need for specialized tools.
But most in the industry, including Pierce, aspire to create a flexible hand capable of doing it all. It's a lofty goal that has eluded roboticists for decades.
The Dream of a Universal Robot Hand
"Everyone has been dreaming for 40 years of one robot hand to rule the world. A lot of people think it could be the humanoid hand," Pierce explains. Kinisi has developed a three-fingered hand, which they consider "pretty good."
However, the challenge lies in making it robust, scalable, and affordable. Their prototype hand costs a whopping £4,000 ($5,400) to produce, a far cry from the simple £400 pincer they currently use.
The difficulty of creating a durable, dexterous, and affordable hand was highlighted by none other than Elon Musk, the CEO of Tesla. Speaking at the All-In Summit in Los Angeles last September, he identified the creation of a hand as one of the three most challenging problems in humanoid robotics. The other two being the development of artificial intelligence to comprehend the world and the mass production of robots.
So, all eyes are on Tesla's upcoming launch of its latest humanoid robot, Optimus. Musk promises it will have "the manual dexterity of a human, meaning a very complex hand."
But not everyone is convinced. Nathan Lepora, Professor of Robotics and AI at Bristol University, calls it "rubbish." He believes human-level dexterity is still a long way off, perhaps a decade or more.
The Promise of Tendon-Driven Hands
Lepora, like the team at Shadow Robot, works on hands with "tendons" that move the fingers. He believes that in the long term, tendon-driven hands using more sophisticated mechanisms will result in more affordable and capable hands.
However, he is impressed by the progress made by Chinese firms, who are taking a different approach. Instead of tendons, they are using motors in the fingers and hands to drive movement. By collaborating with motor manufacturers, they are creating bespoke motors that fit within joints and fingers, potentially leading to effective hands.
One such firm is Wuji Technology, based in Shanghai. Their latest hand features four independently controlled joints per finger, allowing intricate movements. Co-founder Yunzhe Pan says the hand is durable and promises to make it even more so in the next generation.
Currently, each hand sells for $12,000 (£8,800), but Pan assures us they aim to make it more affordable in the future.
The Breakthrough of Tactile Sensing
The Wuji hand also boasts piezoelectric sensors, converting pressure into an electrical charge, giving it a sense of touch. This development is a significant breakthrough for humanoid robots, as it provides them with a durable sense of touch.
But Pierce cautions that there's still a long way to go. He highlights the need for sensors that can withstand the test of time, lasting not just months but years. "In industry, I want this robot to work for 10 years," he says.
Despite the challenges, there's reason to be optimistic. Lepora believes the billions of dollars being invested in humanoid robots is making a difference. "Things are changing," he says.
The journey towards creating robotic hands with human-like dexterity is a challenging one, but it's a quest that continues to inspire and drive innovation in the world of robotics.
