Marks keep things straight

As you machine stock, it can be hard to keep track of which face is flat and square to which edge. So, after your last pass, mark the newly machined surface. Traditionally, cabinetmakers draw a curlicue on the jointed face, and a caret, or inverted "V", on the adjacent squared-up edge, with the point directed to the flattened face.—from the WOOD® shop