The humanoid robot developed by Chinese company XPeng might have an impressive gait, but its mechanical innards are a sight to behold.
Called “Iron,” the bipedal unit has been the talk of robot-watchers around the world, as XPeng enters the second week of its all-out media blitz. Though the company is mainly known for cars, it startled the internet last week with the surprise launch of Iron, which featured mechanical motion many considered too good to be true.
After its debut, social media was ablaze with accusations that the company had stuffed a person inside a robot suit (a stunt several competitors have been caught doing previously, including Elon Musk’s Tesla.) Though the commercial unit features a sleek, white outer skin, XPeng CEO He Xiaopeng was happy to debunk those theories by opening the unit up and showing off its insides.
In the days since, the company’s PR has increasingly featured an undressed version of the robot, which is frankly unsettling to behold. One video shared by XPeng’s X-formerly-Twitter account shows a naked Iron unit running through a tai chi routine, displaying remarkable sensitivity to minute shifts in balance.
In an hour-long breakdown video, American robotics expert Scott Walter explained the impressive machinery behind the unit.
“It’s rather interesting what they’re doing… I have a strong suspicion that this is a five-degree of freedom waist,” Walter says, referring to what XPeng calls a “human-like spine.”
“That’s a lot of degrees of freedom,” he adds.
Walter points out a number of other mechanisms involved, included a head with four degrees of freedom, allowing the entire neck to move around, and a knee actuator located on Iron’s hamstring, which effectively hides the actuator’s motion and gives the impression of a human knee-joint.
Still, for all its flashy motions, Walter says there are some possible weak points in the robot’s design. For example, the uber-complicated five degree of freedom waist has been a point of failure in other units.
“Everyone that’s tried using this waist has been having problems with it,” the robotics expert said, referencing Boston Dynamics.
With a “mass production” target of Spring of 2026, it’ll be interesting to see how XPeng’s foray into commercial robotics shakes out — and whether it can continue to hog the spotlight of some of the flashier robotics companies in the US.
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