A flame-cut 4140 plate is supposed to clean up at 20 mm thick. The plate measures 21 mm in the middle and 20.2 at a bowed edge. The print thickness is 19. The bow is about 1 mm across the plate.
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You cannot get a flat 19 mm plate out of a bowed 20.2 edge without leaving a black edge or going thin. Measure the low corner, not the center, and tell the buyer before you face it. The stock allowance has to cover bow, not only scale.
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Stress moves flame-cut plate when you face one side. Flip and skim both sides rather than taking all the stock off one face and hoping it stays flat.
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If the edge will not clean up, the blank was too thin. That is a purchasing fact, not a machining failure you should hide with a skim that misses a corner.
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Questions and answers were written on this account when they were published.
