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.
It gingerly took its first step, climbing out to begin
exploring 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.
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Spacewalking astronauts set up the link
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.
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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.
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These fixtures are round, antenna-like devices that provide the
robotic arm with power and computer
links. Eventually, many of them will be located around the Station’s external
structure, allowing the arm to walk end-over-end like and inchworm.
Canadarm2 then "stepped out" of its pallet onto the Station.
Historic handshake
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 is the first operation with
two robotic arms ever performed in space. At this point, the system had run through its basic
moves and was now ready to
start helping build the rest of the Station.
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