What is CNC Machining?
CNC (Computer Numerical Control) machining is a subtractive manufacturing process in which pre-programmed software controls the movement of machine tools to remove material from a solid block and form a finished part. Unlike manual machining, every movement of the spindle and cutting tool is automated, giving repeatable, high-accuracy results at any volume.
JIANGCHENG provides precision CNC machining for metal and plastic parts, turning your 3D CAD designs into physical components with tight tolerances and fast turnaround.
How Does CNC Machining Work?
- Design — engineers build a 3D model and define geometry, dimensions and tolerances.
- Programming — CAM software converts the model into G-code with tool paths, speeds and feeds.
- Setup — the raw material and cutting tools are loaded and the workpiece is clamped.
- Machining — the program runs automatically; the spindle rotates the cutter while motors drive the tool or worktable along multiple axes.
- Finishing & Inspection — parts are deburred, surface-finished and inspected against the drawing.
Types of CNC Machining
- CNC Milling — rotating multi-point tools cut a stationary workpiece.
- CNC Turning — the workpiece rotates against a stationary cutting tool.
- 5-Axis Machining — simultaneous movement along five axes for complex geometry.
- CNC Drilling and Grinding — hole-making and high-precision surface finishing.
CNC Machining Materials
| Material | Typical Grades | Machining Tolerance |
|---|---|---|
| Aluminum | 6061, 7075, 5052 | ±0.005 – ±0.02 mm |
| Stainless Steel | 304, 316, 303 | ±0.01 – ±0.05 mm |
| Carbon Steel | 1045, 1215 | ±0.01 – ±0.03 mm |
| Titanium | Ti-6Al-4V | ±0.01 – ±0.025 mm |
| Brass / Copper | C360, C110 | ±0.005 – ±0.03 mm |
| Plastics | ABS, POM, Nylon, PEEK | ±0.05 – ±0.1 mm |
Advantages of CNC Machining
- High Precision — tolerances down to ±0.005mm, verified by full inspection.
- Complex Geometry — intricate shapes and deep cavities that manual methods cannot produce.
- Excellent Consistency — ideal for both prototypes and mass production.
- Material Versatility — a wide range of metals and engineering plastics.
- Fast Turnaround — samples can be shipped in as fast as 5 days.
CNC Machining vs 3D Printing
| Feature | CNC Machining | 3D Printing |
|---|---|---|
| Process | Subtractive (removes material) | Additive (adds material layer by layer) |
| Precision | High (±0.005mm) | Lower (±0.1mm typical) |
| Materials | Metals and plastics | Mostly plastics and resins |
| Best For | Functional, tight-tolerance parts | Quick visual prototypes |
Applications
CNC machining is used across aerospace, medical devices, automotive, robotics, electronics and industrial equipment for prototypes, functional test parts and production runs.
How to Choose a CNC Machining Supplier
- Check machining capabilities, tolerances and available materials.
- Confirm quality control — FAI and OQC inspection reports.
- Ask about lead time and communication in English.
Frequently Asked Questions
What tolerances can CNC machining achieve?
JIANGCHENG routinely holds ±0.005–0.01mm on precision features, with standard tolerances of ±0.05mm for general work.
What is the lead time for CNC machined parts?
Samples can ship in as fast as 3–5 days; larger orders typically take 7–10 days depending on quantity and complexity.
What file formats do you accept?
2D drawings in DWG or PDF, and 3D models in STEP, STP, IGES, IGS or XT.
Do you provide inspection reports?
Yes, we provide FAI (First Article Inspection) and OQC reports, and 100% inspection before shipment.
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