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This is my biggest problem. If the 4x8 sheet comes out of square, one must somehow make a cross cut square to the long edge so that the fence can then be used as a guide to run this cross cut edge against to cut smaller sizes that are also square. How to make a true square cross cut without some kind of sliding table rig that one can hold the long edge against and make the square crosscut. A good attachment like this for a table saw runs around $1000. Too much for my budget. Actually all I really need is a way to make a square line on the plywood, then I don't mind using a straight edge and a circular saw. I should say that I don't believe a framing square or a sheetrock square or the 3 4 5 method are really accurate enough
Looking up "squaring plywood" on the FWW website gave no results. Curious! It's such a basic and presumably oft-encountered situation for anyone dealing with plywood.