To expand on what BJ said use this process for the most accurate cuts: Start off by marking the exact location of the cut. Using an edge guide with your router cut in the center of the area to be removed moving your router from left to right with the guide on the top edge of the router. Reposition your edge guide to one side, make your cut, then repeat for the other side. It is best to remove no more than 1/4" in depth per cut, so for a 3/4" deep cut you would make 3 passes of increasing depth before moving the edge guide.
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Mike |