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Step 11Miter the Boards
A miter is a 90 degree joint formed by cutting each board at a 45 degree angle. This is the most common joint for picture frames, though other joints are sometimes used.
Orient the board so that the board is perpendicular to you and the rabbet is face up and away from you. Make a mark from the bottom left corner to the top of the board at a 45 degree angle. This will help you avoid cutting it wrong later.
Using a miter saw, miter box, table saw or some other accurate cutting method, cut off the corner along the line you made. Use a piece of sand paper to clean up the edge.
This next step is a little difficult to explain but it is very important. The object is to measure the board for the next cut such that when they are assembled later, the mounted picture, glass and all the rest will fit. To do this I first add 1/4" to OD, for now we will use the OD-length, in this case that is 36 3/4". The trick here is that you want to measure from the bottom edge of the rabbet (see picture). Mark the diagonal as before only this time the angle goes the other direction.
Once you have one of the boards cut, use it as a template for the other board to insure that both of your lengthwise boards are exactly the same size and the widthwise boards are exactly the same size.
Orient the board so that the board is perpendicular to you and the rabbet is face up and away from you. Make a mark from the bottom left corner to the top of the board at a 45 degree angle. This will help you avoid cutting it wrong later.
Using a miter saw, miter box, table saw or some other accurate cutting method, cut off the corner along the line you made. Use a piece of sand paper to clean up the edge.
This next step is a little difficult to explain but it is very important. The object is to measure the board for the next cut such that when they are assembled later, the mounted picture, glass and all the rest will fit. To do this I first add 1/4" to OD, for now we will use the OD-length, in this case that is 36 3/4". The trick here is that you want to measure from the bottom edge of the rabbet (see picture). Mark the diagonal as before only this time the angle goes the other direction.
Once you have one of the boards cut, use it as a template for the other board to insure that both of your lengthwise boards are exactly the same size and the widthwise boards are exactly the same size.
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