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In sheet metal process, how to design the structure reasonably, what are the principles and how to choose the gap?
This range is a bit wide, for example, some design skills of bending:

1) The bending line should not be too close to the hole, otherwise it will be deformed;

2) General bending is based on the principle that the long side covers the short side;

3) The clearance depends on the thickness of the plate, generally 0.2-0.5 mm.