A stopped dado or groove is a cut that does not run all the way through a work piece. Making stopped dado or groove cuts can be tricky because you can't see the bit. The trick is to make marks on the router table to show where the router bit is located and make marks on the work piece to show where to start or stop cutting. A technique called a drop cut is used to start the cut. A drop cut is similar to a plunge cut, but instead of plunging the bit into the work piece, the work piece is lowered