SAN DIEGO - A long line of people snaked out of a North County machine shop on a recent Sunday. The customers were there to build a gun. (embedded video) [more inside]
You supply the muscle to move the tool and the computer supplies the accurracy. The tool shown here is a router but it seems like a more general technique. You move a hand held power tool around sloppily and a computer makes small movements of the tool as you do that keeps it to a corrected path.