To strengthen miter joints in narrow stock, use face frame biscuits. They're like standard biscuits but smaller (about 1-3/16 in. long), so you can use them in stock as narrow as 1 inch. To cut the slots, use a 5/32-in.-thick slot cutter in your router table. Set the router fence so the bit cuts a 5/16-in.-deep slot. Then clamp 45-degree guides to your router table. The guides make it easy to feed the workpiece into the slot cutter. Use one guide (A) for one end (A) and the other guide (B) for the other end (B). Test your setup before cutting actual parts of your project.
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