Well, Chris's desire to make a triangular section Lockwood reminded me about pre-forms for hydroforming. The picture that Nick posted was of a u-bend that was two sheets welded at the edges and blown up. I was thinking about how to get rid of the massive wrinkles at the seams after inflation when I thought that you should start with a box section.
It's twice the seam welding work initially, but it'll be more faithful geometry when blown up, and the wrinkles may go away. pretty complex geometry can be reduced to four flat patterns pretty easily...
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Mike Everman
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Bruno Ogorelec
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Mike,
Yes, you are right. But, mild wrinkles can often be beaten out. Remember, you are talking of a lump that is practically solid, even though there's water inside. It's not a limp water balloon. So, you can hammer it where it bulges and it will often be beaten in and push a depression out somewhere else. Very neat, but a bit of an acquired skill.
Yes, you are right. But, mild wrinkles can often be beaten out. Remember, you are talking of a lump that is practically solid, even though there's water inside. It's not a limp water balloon. So, you can hammer it where it bulges and it will often be beaten in and push a depression out somewhere else. Very neat, but a bit of an acquired skill.