If the joint is even slightly open at the top or bottom of the miter, adjust the angle on the miter saw slightly, recut both pieces and check the fit again. Hold the side casing in place.

The compound miter saw is used for making accurate cross-cuts on wood and soft plastic. In Maker Lab we have a Craftsman 7-1/4" Sliding Compound Miter Saw and a DeWalt 12" Compound Miter Saw ...