What is CNC machining?

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CNC machining is a computer-controlled manufacturing process that removes material from a solid block to create precise parts. Guided by digital CAD/CAM design files, CNC machines cut, drill, mill, and turn materials into finished components with accuracy down to ±0.001" or better.

How CNC Machining Works

The process begins with a 3D CAD design, which is converted into toolpaths using CAM software. The CAM program generates G-code -- the language that tells the CNC machine exactly where to move, how fast to cut, and what tool to use. The machine then executes these instructions automatically, removing material layer by layer until the part is complete.

Types of CNC Machining

CNC Milling: Rotating cutting tools remove material from a stationary workpiece. Ideal for complex 3D shapes, pockets, slots, and surface contours. CNC Turning: The workpiece rotates while a stationary cutting tool shapes it. Used for cylindrical parts like shafts, bushings, and fittings. Wire EDM: Uses electrical discharges to cut conductive materials with extreme precision, ideal for hardened steels and complex contours.

Common Applications

CNC machining is used across virtually every industry: aerospace components, automotive engine parts, medical implants and instruments, robotics frames, consumer electronics housings, industrial machinery parts, and custom prototypes. It is ideal for both one-off prototypes and production runs of up to 10,000+ parts.

Why Choose SOMI Custom Parts

At SOMI Custom Parts, we have been delivering precision CNC machined components for over 15 years. Our experienced engineers, modern machine fleet, and rigorous quality control ensure your parts are manufactured to your exact specifications. Whether you need a single prototype or full-scale production, SOMI has the expertise and capacity to deliver. Contact us for a free DFM review and quotation.

Case Study

A startup developing automated guided vehicles needed precision-machined aluminum chassis components with +/-0.002" tolerances. The parts required 3-axis milling, drilling, tapping, and surface finishing. SOMI completed the prototype order in 5 business days, and the client was able to demonstrate their working prototype at a trade show as scheduled.

Industry Data

The global CNC machining market was valued at $85.6 billion in 2024 and is projected to reach $132.5 billion by 2028, growing at a CAGR of 9.1% (Grand View Research, 2025). This growth is driven by increasing demand for precision components across aerospace, medical, and automotive industries.