Abstract: A jig for cutting a finger joint which eliminates the trial and error required to adjust the spacing between the key and the cutting blade. A key and an abutment are arranged on one side of the cutting blade. The key is connected to an alignment ledge on the opposite side of the cutting blade. The key, abutment, and alignment ledge can be aligned with the cutting blade so that the blade will trim all three when they pass over. When the cut is made, a gap is left which is the exact width of the blade. After the cut, the alignment ledge can be slide toward the abutment, closing the gap. The key, connected to the alignment ledge, moves a corresponding distance away from the blade. The key can then be fixed in position. A workpiece can then be placed flush against the trimmed face of the key and be cut, leaving a finger, between the key and the blade, which is the exact width of the adjacent kerf, formed by the blade.