What Is Automotive CNC Machining?

Automotive CNC (Computer Numerical Control) machining is a subtractive manufacturing process where computer-driven tools meticulously remove material from raw workpieces to craft high-precision automotive components. This technology delivers exceptional accuracy, repeatability, and versatility—capable of producing everything from complex engine parts to custom trim pieces, all within tolerances often measured in microns.

How Automotive CNC Machined Parts Are Made

1. CAD Design – Engineers create detailed 3D models, incorporating mechanical requirements like tolerances, stresses, and geometries.
2. CAM Programming – CAD designs are translated into toolpaths via CAM software and converted into machine-readable G-code.
3. Machine Setup – Materials are secured and cutting tools installed. Setup precision is vital to ensure machining accuracy.
4. Material Removal – Operations such as milling, turning, drilling, reaming, and finishing are performed. Multi-axis machines (3- to 8-axis) enable machining from multiple angles.
5. Inspection – Quality control relies on Coordinate Measuring Machines (CMM), lasers, micrometers, and other verifiers.
6. Post-Processing – Surface treatments (anodizing, plating, powder coating) or polishing enhance durability, aesthetics, or friction properties.
7. Final Integration – Machined parts are assembled into engines, transmissions, suspension systems, or interiors.

Materials Used in Automotive CNC Machining

• Aluminum Alloys – Lightweight and conductive, used in engine blocks and housings.
• Steel/Stainless Steel – Strong and durable, ideal for structural and drivetrain components.
• Titanium – High strength-to-weight, favored in high-performance and motorsport parts.
• Plastics/Composites – Lightweight and chemically resistant, used in interiors, housings, and trim.

Common End Applications

• Engine Components – Cylinder heads, pistons, manifolds—impact combustion efficiency and power.
• Drivetrain & Transmission – Gearbox housings, shafts, differentials—must align perfectly to transfer power smoothly.
• Suspension & Steering – Knuckles, control arms, racks—key for safety and handling.
• Brakes – Precision-crafted calipers and pistons ensure consistent braking force.
• Interior & Custom Pieces – Trim, prototype parts, dashboard components—add aesthetic value and uniqueness.
• EV Components – Motor housings, battery enclosures, lightweight structures essential for efficiency and thermal management.

Hinz Company: A Local Leader in Automotive CNC Machining

Overview & Industry Focus

Located in Franklin, Wisconsin, the Hinz Company is a premier provider of automotive CNC machining, delivering high-precision components for OEMs and the aftermarket alike. Established in 1958, Hinz has built its reputation on reliable custom machining, responsive service, and competitive pricing.

Advanced Equipment & Capabilities

• CNC Multi-Axis Swiss Turning: With 8-axis Swiss CNC machines and auto bar feeders, Hinz can process parts from 0.093 to 1.5 inches in diameter, up to 60 inches long, with tight tolerances of ±0.0005 inches.
• CNC Multi-Axis Turning: Their turning centers accommodate parts between ½" to 2-9/16" in diameter, and materials up to 36" long or 7" chucked diameter, all with ±0.0005" accuracy. They are ISO 9001 certified and capable of lights-out six-sigma manufacturing.
• Vertical Machining Centers: Ideal for complex, high-precision parts, Hinz utilizes state-of-the-art vertical machining tools for milling, drilling, tapping, and more.
• Quality & Inspection: Their commitment to quality includes ISO certification, real-time responsive machining, and advanced inspection tools like high-magnification stereo microscopes.

Responsive Machining Approach

What sets Hinz apart is their “Responsive Machining” process. They conduct thorough reviews of submitted client prints, allowing iterative refinement—which enhances accuracy and minimizes per-part costs.

Automotive-Specific Applications

Hinz crafts a variety of automotive components, including:

• Turbocharger Housings, Throttle Bodies, Intake Manifolds, Exhaust Flanges, Custom Exhaust Tips—engine performance and flow parts hinzcompany.com.
• Prototype Components, Custom Wheel Hubs & Rims, and Lightweight Structural Parts tailored for performance and racing applications hinzcompany.com.

Local Advantage

Having a Franklin-based specialist offers several advantages:

• Faster delivery and better logistics.
• Direct communication and hands-on development.
• Better support for rush orders and prototyping.
• Local expertise in automotive quality and compliance standards.

Integrating Hinz Company into the Bigger Picture

By weaving Hinz’s capabilities into the general overview of automotive CNC machining, here's how:

1. State-of-the-Art Equipment Powers Precision – Hinz uses advanced multi-axis Swiss turning and vertical machining, mirroring the modern capabilities discussed earlier.
2. Material Versatility – Their machinery handles ferrous and non-ferrous metals, plastics, and alloys—supporting the material diversity needed for engine, drivetrain, and EV components.
3. Automotive Applications – From turbocharger housings to custom rims, Hinz delivers exactly the kinds of components highlighted as common CNC machining outputs.
4. Quality & Efficiency – ISO certification, six-sigma practices, and responsive machining reinforce the high-precision, mass-production strengths of CNC machining.
5. Local Industry Expertise – Their Franklin location gives regional automotive manufacturers a strategic advantage.

Conclusion: CNC Machining Meets Local Mastery

Automotive CNC machining is the precise art of transforming CAD designs into fully realized, high-tolerance components. From engine parts to EV structures, CNC machining powers modern automotive innovation.

In Franklin, Wisconsin, Hinz Company embodies this excellence. Their deep experience, advanced multi-axis equipment, responsive machining philosophy, and local advantages make them a trusted partner for automotive OEMs and performance specialists alike.