All you need is a good carbide straight-cutting router bit and a piece of 1/2-in. medium-density fiberboard (MDF) with a factory straight edge. The photos show two ways to make your joint. If you have ...

If you don't have these tools, try the second-best solution: a wood router with a “pattern” bit (i.e. a straight bit guided by a bearing). Just clamp or screw a straight guide to the workpiece. The ...