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Welding
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A design may specify that a plate and a tube are welded together, and then a hole is drilled through both parts - only after they are assembled - because welding is somewhat inexact. If the holes were pre-drilled, they might not line up after welding. If the designer had put the hole in each part document, instead of as an assembly feature in the assembly document, the hole would have shown up in the drawings for each part and would have been pre-drilled during manufacturing, which defeats the design intent.
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