Tool Tales: The Pump Drill
A pump drill is an ancient tool traditionally been used to generate friction heat for starting fires, as well as for boring holes. The principle of a pump drill’s operation is similar to the button spinner or whirligig, in which rotational momentum is built and maintained by repeated twisting and untwisting of a cord. After reading about them in a book about primitive technology, I got interested in the idea of a “modern” pump drill, operating on the same principle as the ancient tool but manufactured from industrial-age materials instead of wood, stone, and bone.
