Because cove and crown moldings mount at an angle between two adjoining surfaces, miter-cutting the moldings actually calls for a 45° compound cut.
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Because cove and crown moldings mount at an angle between two adjoining surfaces (in this case, the door and the top shelf), miter-cutting the moldings actually calls for a 45° compound cut, combining a miter and a bevel. To make this cut easily, hold the molding with its top edge resting on the saw table and its bottom edge against the fence. Cut one piece 45° to the right and one 45° to the left.