Three aluminum boxes can look similar in a purchasing spreadsheet and require very different manufacturing commitments. A folded enclosure starts with sheet and joining features. An extrusion starts with a continuous cross-section. A die casting uses a mold to create a three-dimensional body. Their suitability depends on the equipment geometry and change pattern, not just annual quantity.
This comparison helps OEM teams decide when custom aluminum sheet metal enclosures are an appropriate route and when another process deserves evaluation. DRAmetal’s linked product scope is fabricated sheet metal; it should not be read as an offer of extrusion dies or die-casting production.
Begin with the enclosure’s architecture
List the body, lid, end plates, internal supports and mounting interfaces. Identify which features must be continuous and which can be separate components. A design that naturally divides into a base and removable cover may suit sheet fabrication. A long body with an unchanged cross-section may justify an extrusion. Integrated bosses or complex three-dimensional walls may favor a cast route.
Do not evaluate the body in isolation. Secondary machining, end plates, threaded inserts, sealing, finish and assembly can change the total project economics. A cheap basic shell may need considerable work before it accepts the equipment.
Compare change exposure, not only tooling price
| Route | Geometry that often fits the process | Change to investigate |
|---|---|---|
| Folded sheet | Panels, returns, brackets and assembled boxes | Bend access, joint layout and blank utilization |
| Extrusion | Repeated longitudinal cross-section | Whether a new cross-section requires tooling changes |
| Die casting | Integrated body geometry and local features | Mold changes, casting constraints and secondary operations |
The table is a route-selection starting point, not a universal cost ranking. Ask each supplier to quote the same delivered configuration, documentation and finish. Separate one-time costs from recurring operations and record the assumptions behind any break-even comparison.
Follow the revisions that your program actually makes
If connector apertures and mounting points change between variants, determine whether those features are made in replaceable panels or in the primary body. A replaceable rear panel can reduce the amount of common stock exposed to a revision, regardless of the main manufacturing route.
If enclosure depth changes frequently, assess how each route accommodates that change. If the cross-section or integrated mounting architecture changes, a different set of tooling and validation questions arises. Avoid assuming that the process easiest to modify during a prototype remains the best production choice forever.
Keep the material specification tied to the process
“Aluminum” is not a complete material callout. Sheet alloys, extrusion alloys and casting alloys serve different process requirements. Even where two finished parts share a nominal function, their manufacturing route and specified material may not be interchangeable.
Our aluminum-grade guide introduces common sheet choices. For route comparison, obtain a material proposal from the responsible manufacturer and have the design authority approve substitutions rather than copying the alloy from a visually similar housing.
Treat finish and appearance as part of the route
Visible grain, joined seams, cast texture and machined surfaces can respond differently to finishing. If the customer expects a coordinated appearance across the body and cover, define acceptable variation with the selected finishing supplier. Do not promise a uniform anodized appearance solely because every component is aluminum.
Protocase’s custom-enclosure range illustrates fabricated enclosure options and finish choices. It is a reference for process categories, not evidence of DRAmetal’s pricing, lead time or available geometry.
Compare an approved pilot package
Before committing to production, identify what the pilot must demonstrate: mounting fit, cover access, finished dimensions, appearance and the agreed mechanical checks. Functional, thermal, electrical and environmental acceptance may require additional system-level work beyond fabrication.
For a sheet-metal RFQ, send the model, panel drawings, materials, interfaces, finish zones and anticipated revision pattern. DRAmetal can review the fabricated route from enterprise prototypes through repeat OEM orders without treating a generic aluminum box as a fully specified product.
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