Automotive CNC Machining Services for Production Parts

Machining fits parts where tolerances or load paths rule out casting and stamping. Typical work we run: engine brackets, motor housings, transmission valve bodies, sensor mounts, suspension links, battery enclosure inserts and heat sink plates.

A part belongs on a mill or lathe when at least one of these is true. Bearing bores need a press fit, sealing faces need flatness under 0.01 mm, or the feature count is low enough that tooling cost never pays back. Wall sections under 1.5 mm on a die casting tend to warp; machining that same geometry from 6061-T6 bar avoids the porosity problem entirely.

It is a poor fit when the part is a large thin shell with no critical features, or when annual volume passes roughly 50,000 units and geometry is simple. Die casting or forging plus light finishing will beat us on cost per piece. We say so during DFM rather than quote a job we cannot win.

Everything starts with the quote and a free DFM analysis, returned within 12 hours. The DFM report flags features we cannot reach, datums that shift under clamping, and surfaces where the specified finish adds cost without function. Production can start within 24 hours of approval.

For prismatic parts with features on five faces, we use simultaneous 5-axis centers. One setup removes four or five operations and the stack-up error that comes with them. That matters on a transmission housing where two bearing bores share a centerline. A 4-axis mill handles the rest: cylindrical parts with cross-drilled ports, or housings that need rotary indexing.

Turning work runs on mill-turn centers. A shaft with an axial bore, a cross hole and a keyway comes off one machine without losing concentricity. For long parts, we machine on a 4,000 mm travel machine, which covers chassis brackets and battery enclosure rails in a single pass.

We machine aluminium, stainless, steel, titanium, copper alloys and engineering plastics. Aluminium dominates automotive work: 6061-T6, 7075, 6082 and ADC12 for housings. Where corrosion or heat matters, 17-4PH stainless and Inconel appear on exhaust-side parts. Plastics like POM, PEEK and PA cover insulators and wear pads.

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  Tight boresBearing and seal seats held to ±0.005 mm where the drawing calls for it.
• 2
  Flat sealing facesFaced on a 5-axis center to avoid a second-op flip.
• 3
  Thin wallsCut from solid when casting porosity would leak under pressure test.
• 4
  Large railsUp to 4,000 mm on the long-travel machine, one setup.

Material choice usually follows the thermal and corrosion load, not the machinability. Aluminium 6061-T6 and 6082 cover most brackets and housings. Where a part sees salt spray or exhaust heat, 17-4PH stainless and Inconel hold up better, at higher cost and longer cycle time.

Finish is where automotive drawings get specific. Anodizing in clear, color or hardcoat protects aluminium and gives a controlled surface for assembly. Electroless nickel adds wear resistance and a uniform coating on complex geometry, which is why it appears on valve components. Zinc plating covers steel brackets. Powder coating and black oxide handle larger exposed parts.

Cosmetic requirements drive cost more than tolerance does. A bead-blasted housing with a visible A-surface needs more handling and inspection than a hidden bracket held to the same ±0.005 mm. Tell us which surfaces the customer sees. It changes the process plan.

Every part is inspected before shipment. That covers raw material check on incoming stock, in-process monitoring at defined intervals, and a final inspection before packing. Reports are available on request, and we can build a control plan around your drawing's critical dimensions.

Our quality system holds ISO 9001:2015, IATF 16949:2016, ISO 13485:2016 and ISO 27001:2022. The IATF certificate is the one automotive buyers ask about, since it maps to the discipline the sector expects: documented process control, corrective action, and traceability from material lot to finished part.

Most dimensional problems trace back to three causes. Clamping distortion on thin walls. Thermal drift on long runs when the shop is not temperature-stable. And datum choice on the drawing, where the designer's reference does not match how the part sits in the fixture. We raise all three during DFM, before chips are cut.

Uploads are secure and confidential. An NDA is available on request, and we do not share customer drawings or part geometry.

There is no minimum order quantity. A single prototype and a 10,000-part production run go through the same shop, which matters when a design is still moving. You test one part, change a wall thickness, and the next revision starts on the same machines without a new tooling cycle.

For low-volume and prototype work, we machine from bar or plate. No tooling cost, no lead time for a mould. That is the right call when the design is not frozen, or when the annual volume is under a few thousand parts.

At higher volumes, machining remains competitive when geometry is complex or tolerances are tight. Where the part is simple and the volume is large, we will tell you to look at die casting or forging, then finish the critical features here. Mixing processes is often cheaper than forcing one.

Production parts ship in 3–5 days. Historical late-delivery probability sits below 2%. If a schedule is at risk, you hear it from us before the ship date, not after.