"The system, which has a tiny camera, motors and a video screen, takes part of the pain out of woodworking, by using what Mr. Rivers calls “tool GPS.”
You use the new device not by looking down at the wood you’re cutting, he said, but by watching a video screen mounted above the power tool. There, a dot shows the position of the tool bit — just as GPS on a dashboard or a smartphone shows the position of your car on Highway 88."
http://www.nytimes.com/2012/09/23/technology/computer-precision-for-power-tools-novelties.html
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