Quote:
Originally Posted by roystur44
I'm a fan of round perforation patterns for lightening. Instead of triangles or rectangles try a round 60 deg staggered perforation pattern.
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Your fabricator will also thank you. Round holes can be punched much faster than a waterjet can cut (saves time and money). The pattern is a great suggestion; additionally, use a common hole diameter. Even better is to use a dimple die to add a flange to the hole, which adds strenth back to the structure.