Custom ADC12 Die Cast Aluminum Housing for Electronic Equipment

This custom die cast aluminum housing was manufactured for an electronic equipment project in the United States. Made from ADC12 and measuring approximately 150 × 40 mm, the part has a long, narrow cavity with multiple internal bosses, mounting points, recessed features and functional openings.

The customer supplied 2D drawings and 3D CAD data. High-pressure aluminum die casting forms most of the housing and its internal structure in one piece, while selected features are finished by CNC machining where the drawing requires additional dimensional control. Passivation is applied after machining.

From the outside, the housing looks relatively simple. Most of the manufacturing decisions are actually driven by the details inside.

Project Details

A Compact Housing with a Busy Internal Structure

A closer look inside the housing shows bosses of different sizes, two larger openings, smaller holes, local recesses and mounting features distributed along the cavity.

Some of these features can come directly from the die. Others are better finished after casting.

That distinction matters on a custom die cast aluminum housing.

Leaving too much work for CNC reduces the advantage of die casting. Trying to keep every functional feature as-cast can create the opposite problem where the drawing calls for tighter control.

Before tooling, we identify which features can remain as-cast, where machining stock needs to be added, and which holes, openings or interfaces will require secondary machining.

The idea is simple: do not machine more—machine where it matters.

Internal Bosses Need to Work with the Casting

The internal bosses are one of the more noticeable features of this housing. They provide mounting and fastening locations, but they also introduce local changes in the casting geometry.

We look at their diameter, height, draft, fillets and the way they transition into the surrounding walls. A heavy boss connected directly to a thinner wall, for example, needs different consideration from a small isolated mounting feature.

What happens after casting matters too.

Will the boss remain as-cast? Will it be drilled and tapped? Does the top surface need machining? Does it locate another component inside the equipment?

Those questions help determine whether the geometry should be adjusted during DFM or simply prepared for a later CNC operation.

On a narrow enclosure with many features close together, these small decisions can make the overall manufacturing route much cleaner.

Plan CNC Machining Before the Die Is Built

CNC machining is a secondary process for this housing, but it cannot be treated as an afterthought.

If an opening or mounting interface needs final machining, sufficient stock must already exist on the casting. Tool access and part location also need to be practical once the component reaches the CNC machine.

Depending on the final drawing, post-casting operations may include:

• finishing functional openings;
• drilling or reaming holes;
• drilling and tapping threads;
• machining mounting surfaces;
• finishing locating features;
• machining selected assembly interfaces.

At the same time, surfaces that already meet the functional requirement in the as-cast condition can remain untouched.

This is where aluminum die casting and CNC machining work well together: the die creates the integrated geometry efficiently, while machining is concentrated on the features that genuinely need additional precision.

The Narrow Shape Matters During CNC Setup

At approximately 150 × 40 mm, the housing is not particularly large, but its elongated proportions influence the machining setup.

The casting needs to sit consistently in the fixture while leaving the required internal areas accessible to the cutting tools. Locating surfaces, machining stock and tool access therefore need to make sense together.

We prefer to consider these details while reviewing the customer's CAD data, not after the die has already been manufactured.

A casting that is easy to produce but awkward to machine only moves the problem to the next process.

For die cast aluminum parts with secondary CNC machining, looking one operation ahead can prevent unnecessary setups and avoid turning a near-net-shape casting into an overly complicated machining job.

Not Every Surface Needs CNC Machining

More machining does not automatically mean a better die cast part.

Some internal surfaces are functional. Others simply form the enclosure structure.

If an as-cast surface already meets the drawing requirement and does not affect fit, fastening or location, machining it adds another operation without improving the function of the housing.

This is also worth considering when comparing quotations for custom aluminum die casting. Two suppliers may receive the same drawing but choose very different manufacturing routes.

A practical process should make good use of the casting itself instead of relying on CNC to correct or recreate geometry that could have been formed efficiently in the die.

Passivation After Machining

The specified surface treatment for this electronic housing is passivation, rather than paint or powder coating.

Once die casting, trimming and CNC machining are complete, the component moves to the specified passivation process. This retains the metallic character of the aluminum without adding the relatively thick layer associated with a decorative coating.

The main manufacturing route is:

Drawing Review → DFM → Die Casting Tooling → High-Pressure Die Casting → Trimming & Deburring → CNC Machining → Passivation → Inspection

The exact surface-treatment specification follows the customer's drawing and project requirements.

Inspection Before the Next Process Adds Cost

Drawing-controlled CNC features are checked before the housing moves to passivation.

There is a practical reason for this. If a machined hole, opening or mounting interface needs attention, it is better to find it immediately after CNC machining than after another process has already been completed.

The raw casting is also checked before secondary machining. After passivation, the finished housings receive final inspection before packing and shipment to the United States.

This keeps inspection close to the process that created the feature rather than leaving everything until the end.

Custom Die Cast Aluminum Housings from Customer Drawings

This project is a good example of a custom die cast aluminum part where much of the manufacturing complexity is hidden inside the component.

The customer needs a finished housing made to their own design—not a standard enclosure or simply a raw casting. The internal geometry needs to work with the die, selected interfaces require CNC machining, and the specified surface treatment has to fit the final application.

We manufacture custom die cast aluminum housings and other non-standard aluminum components from customer 2D drawings and 3D CAD files. Projects can combine DFM, die casting tooling, high-pressure aluminum die casting, secondary CNC machining and surface treatment according to the part requirements.

If you are developing a custom die cast aluminum housing for electronic equipment, send us your drawings and CAD data for review. We can look at the internal structure, bosses, wall design, casting feasibility, machining areas and finishing requirements before tooling begins.

The useful question is not simply whether the part can be die cast. It is how much of the finished geometry should come from the die, and where CNC machining genuinely adds value.