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CNC Milling Services

Subtractive CNC milling for high-precision parts with complex geometry — from one-off prototypes to production volumes.

CNC Milling Services use computer numerical control (CNC) mills to cut workpieces with rotating tools according to programmed toolpaths. As a subtractive process, milling produces high-precision parts with complex geometry and is widely used from single prototypes through high-volume production.

Milling CNC machining on AIHFABS
Metals & plastics

Service Types (by Number of Axes)

Type Characteristics Typical Uses
3-Axis Milling Lowest cost, simple to run; accuracy down to about ±0.05 mm Basic features such as flats, slots, and holes
4-Axis Milling Adds a rotary axis for angled features Medium-complexity parts such as multi-angle holes and cams
5-Axis Milling Five-axis motion machines multiple faces in one setup High-precision parts such as turbine blades, impellers, and complex surfaces

3-axis and 3+2 solutions suit cost-sensitive simple parts; 5-axis targets high-complexity needs in aerospace, medical, and similar industries.

Core Capability Parameters

Machining accuracy

Standard ±0.01 mm; high precision down to ±0.005 mm

Surface roughness

Finest finishes down to Ra 0.2 μm

Max workpiece size

Up to 4000 × 1500 × 600 mm on 5-axis capacity

Min machining size

From about 5 × 5 × 5 mm

Lead time

Simple parts 1–3 days; complex 3–7 days; batch 5–15 days

Machinable Materials

Metal materials

  • Aluminum alloys (6061, 7075, 2024, 5052, etc.)
  • Stainless steel (304, 316, 303, 420, etc.)
  • Steel (1018, 1045, 4140, 4340, etc.)
  • Titanium alloys (TA1, TA2, TC4 / Ti-6Al-4V)
  • Brass, copper, magnesium alloys, and more

Plastic materials

  • ABS, PC, POM, Nylon, PEEK, PMMA (acrylic), PTFE, PP, PVC, ULTEM (PEI), and more

Surface Finishing Options

After machining, common secondary finishes include:

Anodizing

Improves corrosion resistance and hardness on aluminum; multiple colors available

Bead blasting

Uniform matte texture

Powder coating

Thick, durable protective coating

Chrome / nickel plating

Improves wear resistance and appearance

PVD coating

Ultra-hard vacuum coating

Polishing / brushing

Improves surface smoothness and cosmetics

Other options

Passivation, electrophoresis, silk screening, laser engraving, and more

Typical Application Industries

Industry Typical Parts
Aerospace Turbine blades, structural parts, brackets, housings
Automotive Engine blocks, gearbox housings, custom components
Medical devices Surgical instruments, orthopedic implants, dental restorations
Electronics & telecom Enclosures, heat sinks, connectors, 5G base-station parts
Mold making Injection molds, die-casting molds, stamping dies
Robotics / automation Joint parts, precision structures, transmission components
Energy Drilling components, wind-turbine parts

Service Process

  1. Upload CAD files Submit design files (NDA supported).
  2. DFM analysis & quote Engineers review manufacturability and typically return a quote within 12–24 hours.
  3. Confirm order Select materials, process strategy, and surface finishes.
  4. Precision machining Production starts with full-process quality tracking.
  5. Inspection & delivery 100% dimensional checks, inspection reports, and international express shipping.

Difference from CNC Turning

Comparison CNC Milling CNC Turning
Motion mode Tool rotates; workpiece is fixed or moves slightly Workpiece rotates; tool is largely fixed
Applicable shapes Complex prismatic shapes, polyhedra, and contoured surfaces Cylindrical and rotational parts
Typical parts Housings, brackets, molds Shafts, sleeves, bolts

Design tips

  • Use internal corner radii that match available end-mill sizes.
  • Keep wall thickness consistent where possible to reduce chatter and warp.
  • Consolidate hole sizes to reduce tool changes and cycle time.

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