- 1). Close the legs of an adjustable protractor until they contact the two adjacent walls that make up the corner. On inside corners, reverse the process and open the legs until they contact the two walls. The protractor will provide a readout of the correct angle to set the miter saw.
- 2). Place two scrap boards of equal width against the two adjacent walls of an outside corner if you do not have an adjustable protractor. Snug one board against a wall and the other against the adjacent wall, overlapping the first board by about a half inch or so. For inside corners, you won't be able to overlap the boards but can still use the blocks without overlap.
- 3). Mark the edges of the second board on the first with a pencil. Hold a straight edge on a diagonal, connecting the pencil marks. This resulting line represents the bisection of the corner angle and shows where to set the miter saw angle.
- 4). Set the miter saw blade at the angle determined.
- 5). Make a pencil line on the molding to represent the direction of the cut across it. This will save a few re-cuts since you will always have an idea of how the molding will join up at the corner.
- 6). Put on your safety glasses, position the molding on the saw bed and hold it snugly against the fence. Make the cut.
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