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A Flat Drawing or a Formed Drawing?

A flat drawing describes the blank. A formed drawing describes the finished part. Both are useful, and the review needs to know which one it is looking at.

KorFab Marketing Team, Editorial team

Two drawings of the same bracket can disagree and neither is wrong. One is a blank, one is a finished part, and the difference is a bend allowance that has to live somewhere.

What a flat drawing says

A flat drawing describes the blank: the outline as it sits on the sheet, holes in their pre bend positions, bend lines marked, and often a note about which way each bend goes. It is the drawing the laser reads, so it is the one that has to be right for the cut.

What it does not say is whether the bend allowance was calculated for the die and radius that will actually form it. That is an assumption inside the flat pattern, not a dimension on it.

What a formed drawing says

A formed drawing describes the part that gets delivered: overall dimensions after bending, angles, and hole positions measured from a formed face. It is the drawing the assembly is built to, and it is what a customer inspects against.

What it does not say is how much material to leave so that it arrives at those dimensions after the material has been stretched.

What the review actually needs

KorFab needs to know which flat pattern produces the finished geometry on the drawing, and that means seeing enough to answer three questions: which face is the reference, what the bend angles and radii are, and which dimensions exist only after forming.

Where a customer sends a formed drawing with no flat, that becomes part of the review before cutting. Where both exist, they are checked against each other, because a blank that does not develop to the formed view is a first article problem waiting to happen. KorFab does not provide design services or produce engineering drawings, so a request that starts from a formed view only is a conversation about what information is available rather than a promise to develop the blank.

A practical default

Send the flat for the cut and the formed view for the inspection, in one package. If only one exists, say which it is and what the part has to achieve, because that tells the review where the uncertainty sits. What a fabricator needs to quote a bent bracket lists the rest of what belongs in that package.