7 Sheet Metal DFM Rules for OEM Parts: Bend Radius, Holes, Welding and Finishing

Chinese engineer reviewing sheet metal DFM rules on CAD workstation

This page narrows DFM down to bend radius and hole placement, because those two tiny drawing decisions can wreck a batch with impressive efficiency. CAD is calm; cracked metal is not. Buyer checks include Keep inside bend radius at least equal to material thickness unless the factory confirms tooling., Keep holes away from bend lines so they do not stretch into odd shapes., Add reliefs at corners where material needs space to move.

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