Flanging operation is one of the most difficult task for any beginner: with a few basic hints your operator can switch from beginner to Advance and Pro within a reasonable time, reducing the amount of faulty parts and increasing production.
Despite the world wide advancements in technology, 3D forming is still very much based on operator skills and experience: every single material, shape, thickness and size has its own little tricks and once you get to know them a different world will open in front of you.