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Woodworking jointers are used to make one face/surface of a board and one adjacent edge/surface perfectly flat and square to each other. Jointers are useful for flattening out boards with twists, cups, bows, and uneven surfaces and preparing rough lumber. A jointer are used along with a planer and a table saw when a board is prepared to be 4-square (4s), a board that all four adjacent surfaces are square to each other.
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