Most sheet goods — plywood, particleboard, OSB, etc. — come from the factory as nice square rectangles. Recognizing this benefit, Club member David Oliver of Somerville, New Jersey, keeps track of the factory edges and corners (provided they’re square) by marking them with a pencil. By guiding these edges against the saw fence, he’s able to ensure square cuts for his workpieces. Because these edges get worn and can look ragged, it’s best to cut them off if they’re used in a joint or if they show.