Four easy steps to lap-joint sucess
Install your complete dado set so you get the widest cut possible with it (typically 13/16). Raise the blade above the table (exact height isn't important yet). Adjust your rip fence so one edge of your workpiece butts against the fence and the opposite edge aligns with the side of the dado set farthest from the fence (as shown in the illustration).
If all of your workpieces are of the same width, you can leave your fence at this position for all of the following cuts. If you're working with pieces of different widths, keep in mind that you use a workpiece's adjoining piece to set the fence for its half-lap cut. For example, with a door frame use the horizontal workpieces (the rails) to set the fence for the cuts in the vertical workpieces (the stiles), and vice versa.
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