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The First Steps

During Space Shuttle flight STS-100, in April, Canadarm2, the Canadian-built Space Station Remote Manipulator System, was unfolded from its protective metal cradle and, like a baby gingerly took its first step, it climbed out to begin exploring its new home: the International Space Station.

Setting it up for that first step required a complex choreography involving the Shuttle’s Canadarm and two spacewalking astronauts, including Chris Hadfield, who became the first Canadian to do a spacewalk.

 

First, the Canadarm was used to lift Canadarm2, still folded inside the metal pallet in which it was launched, out of the Shuttle’s cargo bay and attached it to the Space Station Lab, Destiny. Then Hadfield and American astronaut Scott Parazynski attached a temporary cable to supply electrical power and a computer/video link between Canadarm2 and a workstation inside the Station.

Next, Hadfield and Parazynski unbolted the arm from the pallet, manually unfolded its two long booms and secured the hinges in the middle that allowed the booms to be bent in two.

 

Next, astronauts inside the Station commanded Canadarm2 to reach out with one of its two identical "hands" and grasp a device known as a power data grapple fixture on Destiny.

PDGFs are round, antenna-like devices that provide the SSRMS with power and computer links. Eventually, many of them will be located around the Station’s external structure, allowing the arm to literally walk hand-over-hand in a process known as the "inchworm" manoeuvre.

Canadarm2 then "stepped out" of its pallet onto the Station.

A few days later, Canadarm2 and the Canadarm performed the first robotic "handshake" in space. Canadarm2 moved the pallet over the Shuttle’s cargo bay while, inside the Shuttle, Hadfield commanded the Canadarm to reach over and grasp it. When Canadarm2 let go, Hadfield placed the pallet in the Shuttle bay for return to Earth. This was the first joint operation ever done with two robotic arms in space.

At this point, the system had run through all its basic moves and is now ready to start helping to build the rest of the Station.