CNC Machining Services
Get world-class machining capabilities without the overhead of owning a factory. We support 1-piece minimum orders to meet your diverse custom prototyping and production needs.
Advantage: Fast delivery within 24 hours | Precision up to ±0.01 mm.
Get Instant Quote
CNC
Machining
3D
Printing
Printing
Sheet Metal
Fabrication
Injection
Molding
Overview of CNC Milling
A CNC milling machine is an automated machining device that uses rotating cutting tools to precisely remove material. These machines can accommodate different sizes and numbers of axes and are capable of machining not only metals but also plastics, aluminum, stainless steel, and even titanium. CNC milling is widely applied across various manufacturing scenarios, from prototype production to mass manufacturing.
Working Principle of CNC Milling
CNC milling removes material layer by layer from a workpiece using a high-speed rotating cutting tool, forming the desired shape and dimensions. A typical machining process includes:
01
03
step 01
Securing the workpiece
Firmly mounting the metal or plastic material on the worktable.
step 02
Programming the machining process
Using G-code or other control programs to precisely guide the tool along the X, Y, and Z axes.
step 03
Cutting and shaping
The tool rotates along programmed paths to cut the workpiece and achieve three-dimensional shapes.
Axis Description:
3-axis milling
The workpiece is fixed while the tool moves along the X, Y, and Z axes. This is the most common machining method.
4-axis milling
Adds a rotational axis to the 3-axis setup, allowing machining from side angles or tilted positions.
5-axis milling
Adds two rotational axes, enabling multi-angle simultaneous cutting of complex parts, suitable for high-precision machining.
Common Types of Milling Operations
Different machining tasks require different milling methods, including:
Face milling
For smoothing the surface of a workpiece.
End milling
For machining edges, slots, or grooves of a workpiece.
Chamfer milling
For creating beveled edges or chamfers on parts.
Profile milling
For machining complex contours or special shapes.
Since CNC milling shapes parts by cutting away excess material, machining usually leaves toolpath marks. Metal parts can undergo post-processing, such as anodizing or sandblasting, to enhance wear resistance and aesthetics.
Advantages of CNC Milling
High precision and repeatability
Capable of consistently producing parts with exact dimensions.
Wide applicability
Can machine a variety of materials, from plastics and aluminum to stainless steel and titanium.
High flexibility
Suitable for rapid prototyping, low-volume production, and mass production.
Capability for complex parts
Multi-axis milling machines can achieve complex angles and contours that are difficult for conventional equipment.
Features of CNC Machining
Advantages
Drawbacks
Rapid Response
With an efficient CNC machining system, CNCFAST can complete production and delivery in an extremely short cycle — as fast as 2 days. We provide quick and reliable machining solutions to help you accelerate project timelines.
High Precision Manufacturing
We maintain strict dimensional accuracy, typically within a tolerance range of ±0.001”–0.005”. CNCFAST specializes in high-precision component production, ensuring every detail meets the design specifications.
Flexible Production Scalability
From prototypes and small-batch trials to full-scale mass production, CNCFAST adapts flexibly to different manufacturing stages. Our monthly output can reach hundreds of thousands of precision parts.
Advantages
Wide Range of Materials
Over 50 types of metals and engineering plastics are available — including aluminum, stainless steel, copper, POM, nylon, and PEEK — to meet various structural and performance requirements.
Customized Surface Finishes
A variety of surface treatments are available, such as bead blasting, anodizing, electroplating, polishing, and coating, ensuring that your parts achieve both the desired functionality and final appearance.
Cost Efficiency
With no need for expensive molds or tooling, CNCFAST offers a highly economical solution for low- to medium-volume production and product development stages, helping customers reduce overall manufacturing costs.
Structural Complexity
Deep cavities, undercuts, or parts with complex internal geometries may be challenging for CNC machining and may require design optimization or multiple setups.
Drawbacks
Cost and Scale Effect
Compared to injection molding, CNC machining typically has a higher unit cost for large-volume production, making it more suitable for small-batch or customized manufacturing needs.
Our manufacturing capabilities
3-Axis CNC Machine
A 3-axis CNC machine operates by controlling the movement of three linear axes (X, Y, and Z) for machining. This type of machine has a mature structure and is widely used, making it suitable for processing most 2D and simple 3D parts.
Start Your instant Quote
4-Axis CNC Machine
Based on 3-axis machines, 4-axis CNC adds a rotary axis (typically A-axis, rotating around X-axis) to turn workpieces, enabling machining of cylindrical features and multi-side processing in one setup, thus boosting flexibility for complex parts.
Start Your instant Quote
5-Axis CNC Machine
5-axis CNC adds two rotary axes (usually A&C or B&C) to the XYZ linear axes, enabling the tool to access the workpiece from any spatial direction for ultra-complex 3D surfaces. Its core merit is 5-face machining in one setup, ensuring high precision, efficiency and superior surface quality.
Start Your instant Quote
CNC Machining Materials
Metals
Plastics
| Material | Description |
|---|---|
| Aluminum | Lightweight, excellent thermal and electrical conductivity; ideal for structural and appearance parts. |
| Stainless Steel | Corrosion-resistant, strong, and smooth in appearance; used for mechanical structures and housings. |
| Brass | Good machinability with excellent electrical and thermal conductivity; used for decorative and electrical components. |
| Copper | Exceptional electrical and thermal conductivity; suitable for connectors and heat dissipation parts. |
| Titanium | Lightweight, high strength, and corrosion-resistant; ideal for high-end precision components. |
| Mild Steel | Moderate strength, low cost, and good machinability; commonly used for structural parts. |
| Alloy Steel | Excellent mechanical properties and wear resistance; suitable for load-bearing and transmission components. |
| Tool Steel | High hardness and wear resistance; used for molds, cutting tools, and dies. |
| Spring Steel | High elasticity and fatigue strength; used for springs, clips, and resilient components. |
| Material | Description |
|---|---|
| ABS | Strong, tough, and easy to machine; commonly used for housings and structural parts. |
| Polycarbonate (PC) | Transparent and impact-resistant; ideal for guards, covers, and clear parts. |
| Nylon | High strength, wear-resistant, and self-lubricating; used for gears and sliding components. |
| Polypropylene (PP) | Lightweight and chemically resistant; used for containers and mechanical parts. |
| POM | High stiffness and dimensional stability; ideal for precision gears and bearings. |
| PTFE (Teflon) | Excellent heat and chemical resistance with low friction; used for seals and liners. |
| PMMA (Acrylic) | High transparency and visual appeal; used for displays and light covers. |
| Polyethylene (PE) | Impact-resistant and low-temperature durable; used for protective and cushioning components. |
| PEEK | High-performance polymer with excellent strength, temperature, and chemical resistance; for advanced engineering parts. |
| Bakelite | Hard, insulating, and heat-resistant; used for electrical insulation components. |
| FR4 | Heat-resistant and electrically insulating; commonly used for circuit boards and support structures. |
| Carbon Fiber | Lightweight with exceptional strength and rigidity; used in aerospace, racing, and precision machinery. |
Finishes
Common Finishes for Aluminum
Common Finishes for Steel
| Process Name | Description | Typical Color |
|---|---|---|
| Anodized | Forms a dense oxide layer on the aluminum surface through electrolysis, enhancing corrosion resistance, hardness, and wear resistance. Can be colored or left in natural metal color. Suitable for structural parts, decorative components, and electronic housings. | Silver, Black, Gold, Red, Blue, etc. (can be adjusted by dyeing) |
| Electrically Conductive Oxidation | Special electrochemical treatment creates a thin conductive oxide layer, maintaining aluminum conductivity while improving corrosion resistance. Commonly used in electronic structural parts, connectors, or heat dissipation components. | Silver-gray or natural aluminum color |
| Bead Blast + Anodized Color | First bead blasted to create a uniform matte surface, then anodized and colored. Aesthetic, corrosion-resistant, with a matte finish and smooth touch. Suitable for high-end appearance parts. | Matte silver, matte black, matte gold, other custom colors |
| Bead Blast | High-speed sand particles impact the aluminum surface to form a uniform matte texture, improving feel or providing a base for subsequent anodizing. Suitable for decorative and industrial parts. | Matte silver or natural aluminum color |
| Brushed | Sandpaper or wire wheels create elongated texture in one direction, forming a decorative metal surface with comfortable touch. Suitable for panels and decorative components. | Silver, gray, gold, etc. |
| Process Name | Description | Typical Color |
|---|---|---|
| Nickel Plating | Plating a layer of nickel on steel improves corrosion resistance and wear resistance. Surface is smooth and bright, providing decorative effect. Suitable for hardware parts, molds, and electronic components. | Silver-white, gray-white |
| Galvanization | Zinc layer is formed via electroplating or hot-dip galvanizing. Common anti-corrosion process for steel parts. Resistant to humid and hot environments. Suitable for structural parts and bolts. | Silver-gray, matte gray |
| Chrome Plating | Chrome layer on steel surface provides high hardness, wear resistance, and mirror brightness. Commonly used for decorative parts, tools, and molds. | Mirror silver, high-gloss silver |
| Black Oxide | Forms a thin black oxide layer on steel surface, preventing rust and reducing reflection. Suitable for hardware and mechanical parts. | Black or dark gray |
Default Tolerances (For Drawings Without Specified Tolerances)
| Part Length | Dimensional Tolerance (Form & Orientation) | Angular Tolerance |
|---|---|---|
| 0 – 12 in (0 – 300 mm) | ±0.005" (0.125 mm) | ±0.5° |
| 12 – 24 in (300 – 600 mm) | ±0.010" (0.250 mm) | ±0.5° |
| 24 – 36 in (600 – 900 mm) | ±1/64" (0.016", 0.400 mm) | ±1° |
| 36 – 60 in (900 – 1500 mm) | ±1/32" (0.031") | ±1° |
| Over 60 in (>1500 mm) | ±1/16" (0.063") | ±1° |
Notes:
- Dimensional tolerances apply to all basic dimensions (length, width, diameter, etc.) as well as form and orientation features such as straightness, parallelism, and perpendicularity.
- Angular tolerances apply to all angles not specifically called out on the drawing.
- If specific tolerances are required, please clearly indicate them on the drawing. We will manufacture according to the specified values.
- The sharp edges will typically be chamfered with a radius of 0.004–0.012 inches by default. If sharp edges must be retained, please specify this clearly on the drawing.
- By default, fillets will be maintained at the intersections of internal corners, ruled surfaces, and curved surfaces.
CNC Machining Capability Range
| Item | Part Dimensions |
|---|---|
| Maximum Part Size | 900 mm (35.4 inches) |
| Minimum Part Size | 2 mm (0.08 inches) |
| Minimum Diameter | 0.5 mm (0.02 inches) |