A sheet metal enclosure has to work both as a flat blank and as a formed assembly. Check the bends, access for fasteners and fit of the cover before releasing the design. A hole or flange that looks fine in the model may be difficult to form or reach during assembly.
Define the bend geometry
Specify sheet grade and thickness on the drawing. Review the inside bend radius and flange length with the fabricator, since tooling and material affect both. Add relief where a flange ends beside another wall so the metal can bend without pulling the adjoining corner out of shape.
Keep critical features clear of the bend
Holes, slots and cutouts near a bend can distort during forming. Where a connector cutout or fastener hole controls fit, review its distance from the bend and its dimension on the finished part. If it cannot move, discuss whether a relief or a secondary operation is appropriate.
Check assembly before releasing the flat pattern
Open the assembly model and verify access for tools, fasteners and wiring. Check the folded cover against the enclosure at corners and along the seam. Provide the formed model and the drawing, and identify which dimensions control the final fit. Confirm which flat pattern is approved before a repeat run.
Explore the sheet metal bending and forming and sheet metal assemblies.
