Once upon a time there were plenty of square pegs jammed into round holes, but those dark times have passed. Now there is a special shape that allows people to drill square holes. This special ...

A SQUARE hole can indeed be drilled but the process is not simple. One has to clamp a square template over the desired hole. The drill bit has three cutting blades. It also has an eccentric drive so ...

Have you ever wondered why the cover of a manhole is nearly always round? Why isn’t it oval or square? Reuleaux curve based on an equilateral triangle. Reuleaux curves based on the pentagon (top) and ...