Quote:
Originally Posted by Bart
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So you are making a stepped part.
And the guidelines for corners:
inside corners need flanges stretched
outside corners need flanges shrunk
When you are working a series of outside-inside-inside-outside corners, you need to anticipate your flange movements- and in your case you will see puckers outside the steps where metal wants to gather up- and tight/tearing areas where it wants to stretch.
And that is what you got.
So, as you force the metal down into your steps, you also have to work at the 90deg angles to those steps, and it becomes a bit of a tangle until you see what is coming, and work ahead of the disasters.
So - not an easy straightforward part, but it is one that others have done, successfully, here on this forum.