This simple bit of math helps me quickly figure out the right length for any mitered picture-frame molding, based on the art or mat that goes inside. I then use that overall length to set up a stop for mitering the ends on the tablesaw. Start with the length (or width) of the mat, add 1/16 in. for an easy fit, and then simply add twice the distance from the rabbet to the outside edge of the frame. This trick works because the miters are 45°, which means the distance from the rabbet to the edge of the frame is the same as the distance from the end of the rabbet to the point of the miter.
—Tom Richey, Davis, Calif.
Illustrations by Dan Thornton
From Fine Woodworking issue #275
Fine Woodworking Recommended Products
Leigh Super 18 Jig
Stanley Powerlock 16-ft. tape measure
Pfiel Chip Carving Knife
Comments
As a 35+ year picture framer, this is a good formula. However, the industry standard for frame size allowance is 1/8". In your own shop you can use whatever increment you choose. But if you end up working with a professional or a distributor for materials, knowing this could save you some aggravation.
Well, it's about time someone gave up this little secret! Thanks much, Tom!
And thanks also to reader salewis3 for the 1/8" info.
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