Tightening the fit of dadoes and grooves
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when we're trying to get a board to fit snugly into a dado
or groove, we forget the fact that ALL boards are not planed
to identical thicknesses. If we don't have a thickness planer,
the first choice of most woodworkers is often to widen the
dado or groove to accommodate the mating workpiece.
we all know, this isn't always easy. Making micro-adjustments
to most dado blades can be a time-consuming process. So, what's
the easy solution?
simply...adjust the thickness of the mating workpiece, instead.
Set your table saw's depth-of-cut to the exact depth of your
groove or dado...adjust your rip fence to the width of your
dado or groove...and "shave" the excess off the mating edge
of your workpiece to create a perfect fit.