![]() Meaning, I wouldn't use that rule for small stuff, which would be any sheet of plywood that doesn't have at least one factory edge left, from which it comes more square than any cut I've ever made. It's for taking the rack out of something plywood can simply be measured and marked in two locations, have a line scribed and then cut.Īlso, the error tolerance deceases as you increase the multiplier and vice versa straight edges and carpenter's squares are going to be more accurate than your ability to 3-4-5-measure-stuff that's less than 5'. The 3-4-5 is for squaring up prebuilt onsite framing or concrete forms (or for anything longer than your longest straight edge). I either use a drywall T-square, or a measuring tape and a chalk line (working off one of the factory edges). Well at least, I've never used it to cut plywood. How do you use the '3-4-5' rule to accurately make a square cut on a sheet of plywood?
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