Normal Cut?

I have run into issues with the Normal Cut feature in SheetMetal parts. I found that when I can't make certain cuts with thenormal cut feature checked, I can uncheck it and the cut seems towork just fine. However, when I export to .DXF for laser cutting,the part file gets cut out a bit different from my part file.Anyone else have this problem? Can someone explain the normal cutfeature?SolidworksSheet Metal