Any ideas what i am doing wrong? Can`t solve those errors...
Hover over the errors. It tells you exactly what's wrong.
2017 SOLIDWORKS Help - K-Factor Bend Allowances in Swept Flanges
You need to tell the feature how to bend. If you check the box for 'Flatten along path', this will tell the sheet metal how to flatten properly.
This is what i get when i try to unfold it:
Just solved my problem. Just reversed sheet metal direction, and all errors dissapeared. Still don`t get why, but now everything working.
I don't know how to use Solidworks. However, I really want to help. Anyway, since you're an engineer in sheet metal fabrication, I believe the blog with many useful articles might be helpful for you, here is it: https://www.machinemfg.com/blog/
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