Bull's-eye your biscuits
To accurately center biscuits on the thickness of your workpieces, use a rule instead of the joiner's built-in scale. First unplug the tool. Place your ruler against the biscuit-joiner fence and center the blade mark at half the part's thickness. For example, center the blade 3⁄8 " from the fence for 3⁄4 "-thick parts.
—from the WOOD® shop