Cures for Loose Dadoes
Wedges Work Too
For gaps smaller than 1/16", use a wedged spline to spread the ends of the inserted workpiece, tightening the fit. Begin by routing a 1/8"-wide, 1/2"- to 3/4"-deep slot centered along the board's end using a slotting cutter. (You can also cut a 1/8" kerf using your tablesaw, but long, unwieldly workpieces will need the support of a tall auxiliary fence.)
Next, cut a wedged spline with 5° bevels along each face, with the narrow edge the same thickness as your slot. Gently tap the spline into the slot. This might require some trial-and-error trimming or sanding to achieve the perfect fit.
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