Miter and Compound Miters
A miter joint (often miter in American English) is a joint made by cutting each of two parts to be joined, across the main surface, usually at a 45° angle, to form a corner, usually a 90° angle. It is called beveling when the angled cut is done on the side, although the resulting joint is still a miter joint.
For woodworking, a disadvantage of a miter joint is its weakness, but it can be strengthened with a spline (a thin wafer of wood inserted into a slot, usually arranged with the long grain of the spline across the short grain of the frame timber). There are two common variations of a splined miter joint, one where the spline is long and runs the length of the mating surfaces and another where the spline is perpendicular to the joined edges.
Common applications include picture frames, pipes, and molding.
A compound miter comprises angled cuts in two planes; e.g., across the width of a board (miter) and across its thickness (bevel).
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