Astronauts Assemble Dextre Robot During Spacewalk has an update on the assembly of Dextre, the International Space Station’s new robot. Astronauts Rick Linnehan and Mike Foreman conducted a 7-hour spacewalk on Saturday in which they had to wrestle with a couple of stuck bolts. Aside from that, they were successful in assembling the Canadian-built maintenance robot on the end of Canadarm2.