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ESSENTIAL JOINERY

REINFORCING FLAT MITER JOINTS

Miter joints are essentially butt joints that are cut on an angle. As we know, butt

joints are not very strong with glue alone so miter joints are often reinforced for

the sake of durability. Fortunately, the reinforcement can also be a beautiful

decorative element.

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1. Mark a 45° V shape on the

face of a piece of plywood or MDF.

2. Place the frame on the

plywood using the lines. At the

bottom frame corner, use a small

piece of double-stick tape or a dab

of CA glue to secure the frame.

3. Add two clamps and use a

tall fence on the tablesaw if you

have one. Raise the blade so it

goes at least halfway into the

miter joint and make the cut.

4. The slot is usually centered

along the thickness, though you

have some creative flexibility. Use

a square-tooth blade. The slot will

provide a much nicer-looking joint

than an alternating bevel blade.

Miter keys are thin strips of wood that are inserted into the miter joint

after the joint is glued up.

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MITER KEY REINFORCEMENT with SIMPLE GUIDES

TOOLS

Adjustable square

Tablesaw

Square tooth blade

Clamps