Technologies
CNC machining is a subtractive manufacturing process in which a computer-controlled machine removes material from a solid workpiece using rotating cutting tools to produce a precise part. The machine
CNC machining is a subtractive manufacturing process in which a computer-controlled machine removes material from a solid workpiece using rotating cutting tools to produce a precise part. The machine reads G-code — a set of programmed instructions — and executes cutting paths with tolerances as tigh
CNC machining is a subtractive manufacturing process in which a computer-controlled machine removes material from a solid workpiece using rotating cutting tools to produce a precise part. The machine reads G-code — a set of programmed instructions — and executes cutting paths with tolerances as tight as ±0.01mm. CNC stands for Computer Numerical Control and is the backbone of precision metal fabrication across industries.
CNC machining converts a design into a finished metal part through a controlled sequence:
CAD design file creation — Engineer produces a 2D or 3D CAD file defining the part geometry, dimensions, and tolerances using software such as AutoCAD, SolidWorks, or STEP format.
CAM programming — Specialized software converts the CAD model into a machining strategy — selecting tool paths, cutting speeds, feed rates, and the sequence of operations (roughing, finishing, secondary passes).
G-code generation — The CAM program outputs G-code, a machine-readable language that tells the CNC machine exactly where to move the cutting tool, how fast to feed material, and when to change tools.
Machine setup and fixturing — The workpiece is secured in a vice, chuck, or custom fixture. Cutting tools are loaded into the spindle or turret. The operator zeros the machine against the part origin.
Automated tool path execution — The machine runs the G-code program. Rotary spindles spin cutting tools at thousands of RPM while linear axes move the workpiece or tool in X, Y, and Z directions, removing material in controlled layers.
In-process quality checks — The operator monitors part dimensions using calipers or gauges during machining to catch deviations early and adjust feed rates or tool offsets as needed.
Final inspection and deburring — The finished part is removed, inspected against the engineering drawing (tolerances, surface finish, geometry), and deburred or finished as required before shipment.
Entag delivers four core CNC processes. CNC turning rotates the workpiece while a stationary tool cuts cylindrical parts such as shafts, bushings, and connectors to tolerances of ±0.05mm. CNC milling rotates the cutting tool while the workpiece remains fixed, ideal for flat surfaces, pockets, and complex 3D geometry — also ±0.05mm standard tolerance. EDM (electrical discharge machining) uses spark erosion to cut hardened steel and intricate cavities where conventional tools cannot reach, achieving ±0.01mm precision. CNC grinding uses abrasive wheels to finish high-precision flat or cylindrical surfaces to ±0.005mm for gauge-grade applications.
| Process | How It Works | Best For | Typical Tolerance | Entag Capability |
|---|---|---|---|---|
| CNC Turning | Rotating workpiece, stationary cutting tool | Shafts, bushings, round parts | ±0.05mm | ✓ |
| CNC Milling | Rotating tool, stationary workpiece | Flat parts, pockets, complex geometry | ±0.05mm | ✓ |
| EDM (Wire/Spark) | Spark erosion removes material | Hardened steel, intricate cavities | ±0.01mm | ✓ |
| CNC Grinding | Abrasive wheel removes material | High-precision flat/round surfaces | ±0.005mm | ✓ |
CNC machining accommodates most metals and engineering plastics. Common aluminum alloys include Al 6061-T6 (aerospace and general-purpose parts) and Al 7075 (high-strength aerospace components). Structural steel grades S235 and S355 suit load-bearing brackets and housings. Stainless steel — 304 for corrosion resistance and 316L for marine/food-processing environments — is routinely machined. C360 brass is ideal for electrical components and decorative finishes.
Standard CNC machining holds ±0.1mm tolerance per ISO 2768-m (medium tolerance class). Precision CNC machining — used for tight-fit assemblies and critical components — achieves ±0.01mm per ISO 2768-f (fine tolerance class). Surface finish typically reaches Ra 1.6 µm (micrometers) in standard post-machined condition and Ra 0.8 µm with fine finishing passes. At Entag, we machine aluminum, steel, and stainless steel components across turning, milling, and EDM processes to ISO 2768-f tolerances and surface finishes as fine as Ra 0.4 µm for precision applications.
Engineers sourcing parts in Cairo, Alexandria, Jeddah, Riyadh, and Dammam benefit from on-demand CNC services that eliminate long lead times and minimum order quantities. Upload your CAD file and material specification, and receive a detailed quote and lead time within 24 hours.
What is CNC machining in simple terms?
CNC machining is a manufacturing process where a computer program controls cutting tools to remove material from a solid metal or plastic block, producing a precise part. "CNC" stands for Computer Numerical Control. The computer reads a G-code instruction file and moves the cutting tool along programmed paths to achieve the required shape, dimensions, and surface finish.
What is the difference between CNC turning and CNC milling?
In CNC turning, the workpiece rotates against a stationary cutting tool — ideal for cylindrical parts like shafts, bushings, and connectors. In CNC milling, the cutting tool rotates while the workpiece stays fixed — suited for flat surfaces, pockets, and 3D complex geometry. Both processes are subtractive and hold standard tolerances to ±0.05mm. Many parts require both turning and milling operations.
What tolerances can CNC machining achieve?
Standard CNC machining holds ±0.1mm per ISO 2768-m (medium tolerance class). Precision CNC machining achieves ±0.01mm per ISO 2768-f (fine tolerance class) for tight-fit components. EDM (electrical discharge machining) and CNC grinding push tolerances to ±0.005mm for hardened tooling and gauge-grade surfaces. The required tolerance class must always be specified on the engineering drawing before quoting to ensure the correct process and tool selection.
What materials can be CNC machined?
CNC machining works with most metals and engineering plastics. Commonly machined metals include aluminum alloys (6061-T6, 7075), structural steel (S235, S355), stainless steel (304, 316L), brass (C360), and titanium. Engineering plastics such as Delrin, nylon, and PEEK are also machinable. Material selection directly impacts cutting speed, tool wear, cycle time, and final surface finish quality.
How much does CNC machining cost in Egypt?
CNC machining cost in Egypt depends on part complexity, material type, tolerance class, surface finish, and order quantity. Simple turned parts cost from a few hundred Egyptian pounds per unit; complex multi-axis milled components with tight tolerances cost more. Entag's on-demand platform provides instant indicative quotes once a CAD file and engineering drawing are uploaded — no manual RFQ delays.
Can Entag supply CNC machined parts to Saudi Arabia?
Yes. Entag supplies precision CNC machined parts to customers across Saudi Arabia, including Riyadh, Jeddah, and Dammam. Engineers upload CAD files on the Entag platform, receive a quote and lead time within 24 hours, and arrange shipment. Entag's on-demand model is designed for procurement teams who need fast turnaround and quality assurance without maintaining in-house machining capacity or managing multiple local suppliers.
Ready to start your project? Request a quote on Entag — upload your CAD file and get a price in 24 hours.
For detailed tolerance specifications, see our guide to CNC machining tolerances in Egypt. For material-specific machining strategies, read CNC machining materials guide. If you're comparing processes, explore CNC turning services in Egypt and CNC milling in Egypt for detailed capability overviews.
