Custom CNC Milling Services
IATF 16949:2016 certified custom CNC milled parts in metals and plastics. Whether you need a single prototype or millions of production parts, our multi-axis milling centers handle complex shapes with consistent precision — all from one turnkey partner.
What Is Custom CNC Milling?
Custom CNC milling is a machining process where computer-controlled rotating cutters carve material from a solid block of metal or plastic. The part stays fixed while the cutter moves across multiple directions — called axes — to shape flat surfaces, pockets, slots, and intricate 3D contours with repeatable accuracy down to ±0.01 mm.
Machines range from 3-axis mills (X, Y, Z movement) to 5-axis mills that add two rotational axes, letting the tool reach almost any angle in a single setup. Unlike CNC turning where the part spins, milling is the preferred process for non-cylindrical parts requiring complex geometry and tight tolerances. Meco provides custom milling as part of our turnkey manufacturing model — integrated with finishing, assembly, and global logistics, all under IATF 16949:2016 certification.
Why Custom CNC Milling for Your Next Project
No dies or molds needed — go from CAD to finished parts in days. Ideal for aerospace, medical, and automotive components with complex shapes and tight dimensional control.
Why Choose Meco for Custom CNC Milling
Better milled parts, faster lead times, lower total cost.
Multi-Axis Precision
±0.01 mm accuracy with surface finishes down to Ra 0.4 μm. We operate 3, 4, and 5-axis mills with a maximum work envelope of 1016 × 508 × 635 mm
40+ Integrated Processes
Milling connects seamlessly with turning, tapping, drilling, surface finishing, heat treatment, and assembly.
Metals & Plastics
We mill aluminium, stainless steel, titanium, brass, and copper, plus engineering plastics like Nylon, Delrin, and PTFE. 15–30% on production costs.
Certified Quality
IATF 16949:2016 certified — the same standard required by global automotive OEMs. We deliver PPAP packages, First Article Inspection reports and SPC monitoring
Custom CNC Milling Methods Compared
Each axis configuration suits different levels of part complexity, tolerance needs, and budget. Here is a side-by-side comparison to help you choose.
| Factor | 3-Axis Milling | 4-Axis Milling | 5-Axis Milling |
|---|---|---|---|
| Best For | Flat surfaces, slots, pockets, simple profiles Lowest cost | Multi-sided parts, helical shapes, gears Balanced | Complex contours, impellers, aerospace brackets Maximum capability |
| Precision | High (±0.02 mm) | Very High (±0.01 mm) | Ultra High (±0.005 mm) |
| Setups Needed | Multiple setups for multi-sided parts | Reduced — the rotary axis gives access to 4 faces | Single setup for all faces Fewest setups |
| Shape Complexity | Simple to moderate | Moderate to complex | Highly complex, organic, undercuts |
| Cycle Time | Fastest per feature on simple parts | Moderate — fewer repositions needed | Lowest total cycle on complex parts |
| Cost Efficiency | Excellent for standard parts | Balanced cost vs. capability | Best value for high-complexity parts |
| Meco Page | 3-Axis CNC → | 4-Axis CNC → | 5-Axis CNC → |
Custom CNC Milled Parts We Manufacture
Precision milled components in metals and plastics for the world's most demanding applications.
Custom CNC Milling Materials and Capabilities
Maximum work envelope: 1016 × 508 × 635 mm. Accuracy: ±0.01 mm. Surface finish: Ra 0.4–3.2 μm. Standards: ISO 2768, ISO 286.
Metals
| Aluminium | 6061, 7075, 5052, 2024 |
| Stainless Steel | 303, 304, 316, 17-4PH |
| Carbon Steel | 1045, 4140, 4340 |
| Brass | C360, C464 |
| Bronze | C932, C954 |
| Copper | C110, C145 |
| Titanium | Grade 2, Grade 5 |
Plastics
| PA (Nylon) | High toughness, wear resistant |
| POM (Delrin) | Low friction, dimensionally stable |
| PTFE (Teflon) | Chemically inert, ultra-low friction |
| PMMA (Acrylic) | Optically clear, UV resistant |
Ready to Start Your Custom CNC Milling Project?
Upload your CAD files and get a detailed quote with DFM feedback in under 24 hours.
CNC Milling Surface Finishes
| Finish | Compatible Materials | Standards |
|---|---|---|
| Anodizing (Type I/II/III) | Aluminium, Titanium | MIL-A-8625, MIL-DTL-5541F |
| Chrome Plating | Aluminium, Steel, Brass, Bronze, Copper, Zinc | – |
| Zinc Plating | Steel | ASTM B633 |
| Nickel / Electroless Nickel | Aluminium, Steel, SS, Brass, Bronze, Copper, Zinc | – |
| PVD (Physical Vapour Deposition) | Aluminium, Steel, SS, Brass, Bronze, Copper, Zinc | – |
| Painting | All metals | ISO 15184, ISO 2409 |
| Powder Coating | All metals | – |
| E-Coating (Electrocoating) | All metals | – |
| Galvanizing (Hot Dip) | Steel | ASTM A123, GB/T 13912 |
CNC Milling Tolerances
| Class | 0.5–3 | 3–6 | 6–30 | 30–120 | 120–400 | 400–1000 | 1000–2000 | 2000–4000 |
|---|---|---|---|---|---|---|---|---|
| Fine (f) | ±0.05 | ±0.05 | ±0.10 | ±0.15 | ±0.20 | ±0.30 | ±0.50 | — |
| Medium (m) | ±0.10 | ±0.10 | ±0.20 | ±0.30 | ±0.50 | ±0.80 | ±1.20 | ±2.00 |
| Coarse (c) | ±0.20 | ±0.30 | ±0.50 | ±0.80 | ±1.20 | ±2.00 | ±3.00 | ±4.00 |
| V. Coarse (v) | — | ±0.50 | ±1.00 | ±1.50 | ±2.50 | ±4.00 | ±6.00 | ±8.00 |
| Class | ≤10 | 10–50 | 50–120 | 120–400 | >400 |
|---|---|---|---|---|---|
| Fine (f) | ±1° | ±0°30′ | ±0°20′ | ±0°10′ | ±0°5′ |
| Medium (m) | ±1°30′ | ±1° | ±0°30′ | ±0°15′ | ±0°10′ |
| Coarse (c) | ±3° | ±2° | ±1° | ±0°30′ | ±0°20′ |
| Class | 0.5–3 | 3–6 | >6 |
|---|---|---|---|
| Fine (f) | ±0.20 | ±0.50 | ±1.00 |
| Medium (m) | ±0.40 | ±1.00 | ±2.00 |
| System | Description |
|---|---|
| Hole Basis | The hole size is fixed (designated H) and the shaft diameter varies. This is the most common system because standard reamers and boring tools can be used. |
| Shaft Basis | The shaft size is fixed (designated h) and the hole diameter varies. Typically used when a standard-diameter shaft must fit into multiple housings. |
| Fit | Type | Application |
|---|---|---|
| H7/g6 | Clearance | Precision sliding fit — parts move freely with minimal play |
| H7/h6 | Transition / Clearance | Accurate location — slight hand pressure to assemble |
| H7/p6 | Interference | Press fit — requires a hydraulic press or thermal expansion to assemble |
Custom CNC Milling Services for Critical Industries
High-precision 3, 4, and 5-axis custom milling solutions for 10 sectors — from rapid prototyping to high-volume production with micron-level accuracy.
Aerospace Parts Manufacturing
Flight-critical custom CNC milled components built for zero-defect reliability. We machine structural brackets, turbine housings, avionics enclosures, and landing gear fittings from titanium, Inconel, and aerospace-grade aluminium — holding ultra-tight tolerances even under high-stress thermal and fatigue conditions.
Automotive Parts Manufacturing
High-volume custom CNC milled powertrain and chassis components produced under IATF 16949 quality controls. We machine engine blocks, transmission cases, suspension brackets, and EV motor housings from aluminium and steel alloys to meet strict OEM specifications and PPAP (Production Part Approval Process) requirements.
Medical & Healthcare
Custom CNC milled parts for diagnostic, surgical, and patient-care devices. We machine biocompatible surgical guides, implant components, diagnostic enclosures, and prosthetic parts from 316L stainless steel and titanium — with full lot-level traceability and documentation for regulatory compliance.
Heavy Equipment Manufacturing
Large-format custom CNC milled parts for construction, mining, and agriculture equipment. We produce manifold blocks, structural mounts, bearing housings, and valve bodies from 4140 and 4340 high-strength steels — then heat-treat and surface-finish them in-house so they can withstand extreme loads and harsh environments.
Industrial Manufacturing
Precision custom CNC milled fixtures, jigs, mounting plates, and enclosures for pumps, motors, and automation systems. We combine milling with drilling, tapping, turning, and surface finishing in a single workflow to cut lead time and reduce per-part cost across industrial production programs.
Consumer Electronics
Custom CNC milled aluminium enclosures, heat sinks, and structural frames for premium consumer devices. Our 5-axis precision delivers mirror-class surface finishes and burr-free edges on unibody casings, speaker grilles, button bezels, and wearable device frames — meeting the cosmetic and dimensional standards that consumer electronics demand.
Telecommunication
Custom CNC milled waveguides, RF cavity filters, amplifier housings, and 5G base station components. Our multi-axis milling achieves the dimensional accuracy and surface conductivity needed for EMI shielding (electromagnetic interference protection) and signal integrity in modern telecommunication infrastructure.
Commercial Furniture
Custom CNC milled mounting brackets, pivot mechanisms, decorative trim panels, and structural connectors for office seating, height-adjustable desks, and modular storage systems. We handle finishing and assembly in-house to deliver complete furniture hardware ready for final assembly to BIFMA/ANSI standards.
Home Appliances
Custom CNC milled internal mechanisms, control panels, structural frames, and heat-resistant housings for kitchen, laundry, and HVAC systems. We combine die-casting with precision milling to produce complex enclosures that pass UL/IEC life-cycle testing and salt-spray corrosion requirements.
Lighting Manufacturing
Custom CNC milled aluminium heat sinks, lamp housings, reflector bodies, and architectural fixtures for LED, commercial, and decorative lighting. Precision milling maximises the surface area available for heat dissipation while achieving the cosmetic quality and tight light-distribution tolerances that visible installations require.
When to Choose Custom CNC Milling
CNC milling is one of several methods for producing precision metal parts. This comparison helps you pick the right process — or let our engineers recommend the best fit for your project.
| Factor | CNC Milling | CNC Turning | Die Casting | Forging |
|---|---|---|---|---|
| Best For | Flat surfaces, pockets, complex 3D contours, housings Best for prismatic parts | Cylindrical parts (shafts, pins, fittings, bushings) | Complex thin-wall castings at high volume | High-strength structural parts (gears, flanges) |
| Tolerance | ±0.01 mm Ultra precise | ±0.01 mm | ±0.05–0.10 mm (as-cast) | ±0.5–1.0 mm (as-forged) |
| Surface Finish | Ra 0.4–3.2 μm Excellent on flat & contoured | Ra 0.4–3.2 μm | Ra 1.6–6.3 μm | Ra 3.2–12.5 μm |
| Volume Range | 1–50,000+ | 1–100,000+ | 1,000–1,000,000+ | 500–500,000+ |
| Tooling Cost | None Lowest startup cost | None | High (die required) | High (dies required) |
| First Part Lead Time | 1–2 weeks | 1–2 weeks | 4–8 weeks | 4–8 weeks |
| Meco Service Page | You are here | CNC Turning → | Die Casting → | Forging → |
Quality Assurance & Documentation
Every custom CNC milled part ships with full traceability and documentation. Our IATF 16949:2016 quality management system — the same standard required by global automotive OEMs — governs every step from raw material receiving through final inspection and packaging.
PPAP Documentation
Full Production Part Approval Process packages with control plans, process flow diagrams, and dimensional results.
First Article Inspection
FAI reports with complete dimensional verification of the first production parts checked against your drawing specifications.
CMM Inspection Reports
Coordinate Measuring Machine verification to ±0.002 mm with GD&T (Geometric Dimensioning and Tolerancing) evaluation and deviation reports.
Full Traceability
Lot-level tracking from raw material through every machining, finishing, and assembly step. Complete audit trail on every part.
Material Certs & CoA
Mill test reports, Certificates of Analysis, and material compliance documentation included with every shipment.
REACH & RoHS
Full regulatory compliance documentation for EU REACH and RoHS directives, verified at both material and finished-part level.
CTQ Reporting
Critical-to-Quality dimension tracking with SPC (Statistical Process Control) charts, Cpk analysis, and trend monitoring across production runs.
Conflict Minerals
CMRT (Conflict Minerals Reporting Template) documentation per SEC/Dodd-Frank requirements for tin, tantalum, tungsten, and gold sourcing.
Custom CNC Milling FAQ
What is custom CNC milling?
Custom CNC milling is a machining process where computer-controlled rotating cutters remove material from a solid block to create precision parts. The workpiece stays still while the cutter moves along multiple axes — producing flat surfaces, pockets, slots, holes, and complex 3D shapes with accuracy down to ±0.01 mm. It is the standard method for parts with non-cylindrical geometry.
What is the difference between 3-axis and 5-axis milling?
3-axis milling moves the cutter in three straight-line directions (X, Y, Z) and works well for simple flat-sided parts. 5-axis milling adds two rotational axes so the tool can approach the workpiece from virtually any angle. This means you can cut complex contours, undercuts, and organic shapes in a single setup — with fewer errors and faster cycle times than repositioning the part multiple times on a 3-axis machine.
What materials can be custom CNC milled?
We mill a wide range of metals and plastics. Common metals include Aluminium (6061, 7075, 5052, 2024), Stainless Steel (303, 304, 316, 17-4PH), Carbon Steel (1045, 4140, 4340), Brass, Bronze, Copper, and Titanium. For plastics, we machine Nylon, Delrin (POM), PTFE (Teflon), and PMMA (Acrylic). Our engineers help you select the right material based on your part's strength, weight, corrosion, and cost requirements.
What tolerances can custom CNC milling achieve?
Standard commercial tolerances follow ISO 2768 and are typically around ±0.05 mm. With precision equipment and optimised setups, we routinely hold ±0.01 mm on critical features. Surface finishes range from Ra 3.2 μm (as-milled with visible tool marks) down to Ra 0.4 μm with finishing passes. Every critical dimension is verified on a CMM (Coordinate Measuring Machine). See our CNC machining cost guide for how tolerance choices affect pricing.
How much does custom CNC milling cost?
Price depends on several factors: the material you choose, how complex your part geometry is, how tight the tolerances need to be, what surface finish is required, and how many parts you are ordering. Our Design for Manufacturability (DFM) review typically identifies ways to simplify machining and reduce cost by 15–30% without compromising function. Read our detailed pricing guide for real-world cost breakdowns.
What is the standard surface finish for CNC milled parts?
A typical as-milled surface finish is Ra 1.6–3.2 μm, which means you may see faint tool marks on the surface. If your application needs a smoother or more cosmetically appealing finish, we can apply finishing passes, bead blasting, anodising, powder coating, or polishing to reach Ra 0.4 μm or better.
What industries use custom CNC milled parts?
Almost every industry that requires precision metal or plastic components uses CNC milling. The most common include aerospace (structural brackets, housings), automotive (engine blocks, transmission cases), medical (surgical guides, implant components), telecommunications (waveguides, RF filters), consumer electronics (enclosures, heat sinks), and industrial equipment (fixtures, manifold blocks).
How do I get a quote for custom CNC milling?
Upload your 3D model in STEP or IGES format along with your material and finish requirements through our quote form. We return a detailed quote with DFM feedback in under 24 hours. There is no minimum order quantity — we handle everything from 10 pieces to 10 million+.
How to Get Started
Upload STEP or IGES files with your material and finish requirements through our quote form. PDF or DWG drawings with tolerances and GD&T callouts are also welcome.
Our engineers analyse your design for machinability and deliver a detailed quote with optimisation suggestions — typically in under 24 hours.
Parts are milled, finished, and inspected. Every critical dimension is verified on a CMM with full documentation including FAI (First Article Inspection) reports and Certificates of Analysis.
Parts ship worldwide with complete quality documentation. Need to scale? Same partner, same quality system — from 10 pieces to 10 million+.
CNC Milling Resources
CNC Milling and Turning: Complete Guide
Learn how milling and turning work together, when to use each process, and how combining them under one manufacturer reduces cost and lead time.
Read the guide →
How Much Does CNC Machining Cost?
Understand the real pricing drivers — hourly rates, material costs, batch economics — and how turnkey manufacturing reduces your total spend.
Read the guide →
CNC Machine Costs: Buy vs. Outsource
Compare the real cost of owning CNC equipment versus outsourcing to a contract manufacturer. Includes CapEx, hourly rates, and break-even analysis.
Read the breakdown →Get Your Free Quote
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