Milling is the process where you take a piece of rough lumber and mill it so the faces are flat and parallel to each other and the edges are 90 degrees to the faces.
Using the chop saw, the board is cut to the rough length required. One edge is joined and then a face is joined using the jointer. This gives a 90 degree angle to the edge and face of the board. The board is then run through the planner. Now the board has 2 parallel faces and one edge that is 90 degrees to both faces of the board. The board is now ready to get ripped to width on the table saw. The faces are parallel to each other with 90 degree angles to the edges.
Table saw Planner Jointer
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