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Custom CNC Milling Services
3-Axis to 5-Axis Precision Parts
When your design demands complex geometries, tight tolerances, and a surface finish your in-house team can actually inspect — Great Light delivers. From a single prototype to 100,000+ production units, our custom CNC milling services hold tolerances to ±0.01mm across 100+ materials. Free DFM analysis. Quote in 2 hours.
- Custom CNC Machined Prototypes (One-Off & Small Batch)
- High-Volume Production: 100K+ Units
- Precision Tolerances up to ±0.01 mm
- 50+ CNC Machines
Get Inquiry NowAbout Great Light
Start Your CNC Milling Quote
Upload CAD files — our engineers respond with DFM feedback in 2 hours.
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STEP STP SLDPRT IPT PRT SAT IGES IGS CATPART X_T OBJ STL files
What Is CNC Milling?
The Manufacturing Process That Engineers Reach for When Precision Cannot Compromise
CNC milling is a computer-controlled subtractive machining process where rotating cutting tools systematically remove material from a solid workpiece — metal or plastic — to produce a final geometry with defined dimensional accuracy. Unlike additive processes that build layer by layer, milling starts from full-density material, which is why milled parts consistently outperform printed counterparts in mechanical strength, surface finish quality, and dimensional repeatability.
Consider this: If your part spec calls for a pocket ±0.02mm deep across 200 units — can your current supplier guarantee that on paper, with CMM data per shipment? At Great Light, it is our baseline operating standard, not an exception.
Great Light has operated precision CNC machining centers in Dongguan since 2005. Our 50,000 sq. ft. facility houses 50+ CNC machines including 3-axis, 4-axis, and 5-axis simultaneous milling centers. Every machine is programmed using SolidWorks and Mastercam CAM software, operated by machinists averaging 8+ years of tenure on their specific machine type.
Whether you are an R&D engineer validating a new product concept, a procurement manager sourcing bridge production parts, or a startup that needs 10 functional prototypes in production-grade aluminum by Thursday — our digital quoting platform, in-house engineering review, and production scheduling system exist to make your timeline the priority.
Watch Our CNC Milling Process in Action
Core CNC Milling Capabilities
⚙️3-Axis CNC Milling
Flat features, slots, pockets, and holes. Standard ±0.1mm tolerance. Max part size 1000×500×500mm. Most cost-effective configuration for prismatic geometries.
🔄4-Axis CNC Milling
Indexing rotary axis for multi-sided features and long cylindrical workpieces — fewer setups, better positional accuracy, lower per-part cost on complex designs.
⭐5-Axis Simultaneous CNC Milling
Simultaneous 5-axis contouring for aerospace turbine blades, medical implants, and mold cavities. Tolerance ±0.005–0.008mm. Max size 4000×1500×600mm.
⚡Rapid Prototype Milling
Functional prototypes in production-representative metal or plastic — as fast as 1 business day for simple geometries. No tooling cost. No minimum quantity.
🏭Low-to-High Volume Production
10 to 100,000+ parts with statistical process control, batch inspection records, and scalable delivery schedules aligned to your product launch timeline.
Milling Services Portfolio
3-Axis to 5-Axis — Every CNC Milling Capability Under One Roof
What does it actually cost you when your 5-axis work goes to one supplier, your prototypes to another, and your finishing to a third? Coordination delays, tolerance stack-up between vendors, and no single point of accountability. Great Light eliminates all three.
3-Axis CNC Milling Service
Ideal for prismatic parts, flat faces, slots, drilled holes, and pocketed geometries. The most cost-effective configuration for most industrial and commercial components. Vertical and horizontal milling centers available.
Tolerance: ±0.1mm standard | ±0.01mm precision
Part size: up to 1000 × 500 × 500mm
4-Axis CNC Milling Service
4-axis CNC milling adds a rotary A or B axis to the standard 3-axis setup, enabling multi-sided machining of long parts and complex cylindrical features in fewer setups. Essential for crankshafts, cam profiles, and helical features.
Tolerance: ±0.05mm | Rotary: continuous or indexed
5-Axis CNC Milling Service
Tolerance: ±0.005–0.008mm | Size: up to 4000×1500×600mm
Rapid Prototype Milling
Need a functional prototype that behaves like a production part — not a 3D-printed approximation? CNC milled prototypes in aluminum, steel, or PEEK deliver actual material properties for meaningful functional testing.
Lead time: 1–5 business days | Qty: from 1 piece
Low & High-Volume Milling
Scale from 10 parts to 100,000+ using the same CNC program, same material verification, and same quality engineer — so your production transition introduces no new variation. Batch inspection records provided per shipment.
MOQ: 1 piece | Max: 100,000+ | SPC available
Materials
100+ CNC Milling Materials — Metal, Plastic & Composite
Not all CNC shops can machine the full spectrum of engineering materials. Titanium work-hardens. PEEK requires specific cutting parameters. Magnesium is pyrophoric if handled incorrectly. At Great Light, our machinists are certified and experienced with each material category — and all stock carries full traceability documentation from certified suppliers.
Metal Alloys
Aluminum Alloy(6061, 7075, 2024)
Aluminum alloys are lightweight, low-density, corrosion-resistant, and have good mechanical properties, making them an excellent material for the aerospace, electronics, and automotive industries.
Steel (Mild Steel & Hardened Steel)
Steel possesses high strength and durability. Low-carbon steel is easy to process; hardened steel is more wear-resistant.
Brass (C360, C260)
Free-machining grade, Excellent machinability, corrosion resistant, decorative
Titanium
Highest strength-to-weight ratio, biocompatible, zero corrosion
Copper (C110, C101)
Copper has excellent thermal and electrical conductivity, making it the preferred material for electrical components and heat exchangers.
Stainless Steel (303, 304, 316, 17-4)
Stainless steel has excellent chemical durability, strength and surface finish, making it suitable for harsh application environments.
Magnesium (AZ31)
Magnesium is lightweight and has excellent processing properties, making it commonly used in the aerospace, automotive, and electronics industries.
Plastics
POM/Delrin
POM has high strength, low coefficient of friction and dimensional stability, making it suitable for gears, bushings and wear-resistant parts.
ABS
ABS is cost-effective and has excellent toughness, making it commonly used to manufacture durable prototypes, shells, and structural components.
Nylon (6/6)
Nylon is lightweight, flexible, and impact-resistant, making it the preferred material for gears, bushings, and sports equipment.
Polycarbonate (PC)
PC material is impact-resistant and has excellent transparency, making it suitable for lenses, protective covers, and functional prototypes.
HDPE/UHMWPE
HDPE has excellent corrosion resistance, low coefficient of friction and low moisture absorption, making it suitable for wear-resistant plates, bearings and bushings.
PMMA (Acrylic)
PMMA has high optical transparency and rigidity, making it suitable for lenses, displays, and signage.
PTFE (Teflon)
PTFE has excellent heat and chemical resistance, and provides excellent electrical insulation for seals, insulators, and chemically processed components.
PVC
PVC has excellent chemical resistance and is cost-competitive, making it ideal for fluid handling, housings, and CNC machined parts for a variety of industrial applications.
PEEK
PEEK is a high-performance thermoplastic with excellent strength, heat resistance and chemical stability, and is commonly used in the aerospace, medical and semiconductor industries.
Don’t see your material? Contact our engineering team — we source specialty alloys and high-performance composites on request.
CNC Milling Surface Finishes
Enhance the quality of your custom CNC-milled parts through superior surface treatment services, eliminating appearance defects and enhancing their corrosion resistance, wear resistance, and environmental stress resistance. This is part of our comprehensive CNC machining process.
Tolerances for CNC Milling
We maintain strict CNC milling tolerance standards to ensure every part meets precise dimensional accuracy and superior quality. Our standard tolerances follow ISO 2768-m for metals and ISO 2768-c for plastics, guaranteeing consistency and reliability across all production runs. Whether for prototypes or full-scale manufacturing, our advanced processes deliver cost-effective, precision-milled parts that meet your exact design requirements.
- Maximum Part Size
- Minimum Part Size
- General Tolerances
- Lead Time
3-Axis
1000 x 500 x 500 mm
5 x 5 x 5 mm
±0.1 mm
Delivery of simple parts can be as fast as 1 day.
4-Axis
1000 x 500 x 500 mm
5 x 5 x 5 mm
±0.1 mm
5 bussiness days for most projects.
5-Axis
4000 x 1500 x 600 mm
5 x 5 x 5 mm
±0.05 mm
5 bussiness days for most projects.
Your CNC Milling Project Shouldn't Wait
Upload your 3D model or 2D drawing now. Our team analyses for manufacturability and responds with a quote — and real DFM feedback — in under 2 hours. No salesperson. No commitment. Just engineering.
Upload Files & Get Free Quote
Design Guidelines
CNC Milling Design Rules That Cut Cost Without Cutting Quality
Most rework in CNC milling is preventable at the design stage. A wall 0.5mm too thin. A pocket 5× too deep for its width. An internal radius that forces a micro-tool and triples cycle time. Our DFM review catches these before you pay for a single chip of material. Here are the principles we apply on every project:
| Design Feature | Best Practice | Why It Matters |
|---|---|---|
| Wall Thickness | Metals ≥ 0.8mm · Plastics ≥ 1.5mm | Thinner walls vibrate during cutting, causing chatter marks and dimensional drift |
| Cavity Depth | Max depth = 4× cavity width | Deep narrow pockets require long slender tools that deflect and reduce accuracy |
| Internal Fillets | Radius ≥ 1/3 of cavity depth | Larger radius = larger tool = less deflection = better surface finish and lower cost |
| Hole & Thread Diameter | Use standard drill/tap sizes | Non-standard holes require custom tools — adds cost and lead time |
| Undercuts | T-slot: 3–40mm · Dovetail: 45° or 60° standard | Non-standard undercut angles require custom cutters and manual programming |
| Surface Finish Callout | Specify Ra on drawing; default Ra 1.6μm as-machined | Unspecified finishes result in as-machined delivery — not suitable for all assemblies |
| Feature Alignment | Consolidate holes/features on fewest faces possible | Each additional setup face adds cost — align features to minimize setups |
The Process
CAD File to Shipped Parts — 5 Steps, Zero Ambiguity
The most common complaint we hear from engineers switching suppliers: “We never knew where our order was or when it would ship.” Here is exactly what happens after you hit ‘send’.
1
Upload Files
STEP, IGES, STL, SolidWorks, or PDF via our encrypted secure portal. NDA signed before review if required.
2
DFM Review & Quote
Engineers analyse manufacturability and return a competitive quote + actionable DFM feedback in 2 hours.
3
Approve & Schedule
Approve quote → job enters production queue immediately. No batching delays. Your timeline drives scheduling.
4
Mill & Inspect
Machined on selected-axis CNC center. CMM in-process and final inspection. Surface finish verified against Ra spec.
5
Finish & Ship
Surface finishing applied if specified. Shockproof packaging. DHL/FedEx/UPS global express. US & EU in ~4 days.
Why Great Light
Six Structural Differences That Make Every CNC Milling Order Better
The most common complaint we hear from engineers switching suppliers: “We never knew where our order was or when it would ship.” Here is exactly what happens after you hit ‘send’.
Verified Tolerances — CMM Data Per Shipment
We document tolerance compliance with CMM reports on every order. ±0.008mm isn’t a marketing claim — it’s the number on your inspection report.
2-Hour Quote + Free DFM Analysis
Engineering review of your CAD files for manufacturability issues — free, included with every quote. Most suppliers charge for this or skip it entirely.
Triple Industry Certification
ISO 9001:2015 for general quality, ISO 13485 for medical devices, IATF 16949 for automotive — one quality system covering all three.
IP Protection — NDA Before File Review
ISO 27001-certified data security. We sign your NDA before any engineer views your design. Role-restricted access controls. Encrypted storage always.
1-Day Express to 10-Day Production
Flexible scheduling for any urgency level. Simple parts in 1 day. Production runs in 5–10 days. All timelines confirmed at quote stage, not after approval.
Prototype-to-Production Continuity
Same program, same engineer, same material lot system from your first prototype to your 10,000th production part — zero variation introduced at scale-up.
Client Reviews
What Engineers Say After Their First CNC Milling Order
★★★★★
“We have been sourcing CNC machined parts from this factory for over two years. Their precision, delivery speed, and willingness to accommodate custom requests are unmatched. It’s rare to find such a reliable and technically capable partner.”
★★★★★
“Their team has consistently delivered components that meet our tight tolerances. Communication is always clear and timely, and they have helped us solve multiple design challenges with engineering support. A trustworthy CNC supplier.”
★★★★★
“I’ve worked with many CNC suppliers, but Great Light stands out. Their attention to detail and commitment to quality gives us confidence for our high-performance assemblies. They’re not just a vendor — they’re a real manufacturing partner.”
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FAQ
Frequently Asked Questions About
Everything our engineering team answers daily — answered here, in full. If yours is missing, we respond to enquiries within 2 hours.
What is CNC milling and how does it work?
CNC milling is a subtractive manufacturing process where computer-controlled rotating cutting tools remove material from a solid metal or plastic workpiece to produce precision geometries. Great Light’s milling centers operate on 3, 4, and 5 axes — enabling everything from simple pockets and holes to complex curved surfaces machined in a single setup. CAD/CAM software (SolidWorks, Mastercam) translates your digital design into precise toolpaths, ensuring dimensional accuracy and repeatability across every part in the batch.
What CNC milling tolerances can Great Light achieve?
3 and 4-axis milling holds standard tolerances of ±0.1mm, with precision milling achieving ±0.01mm. Our 5-axis simultaneous centers achieve ±0.005mm to ±0.008mm for aerospace and medical applications. All shipments include CMM dimensional inspection data verifying compliance with your drawing. If a specific GD&T callout drives your critical tolerance, include it on your 2D drawing and our DFM team will confirm achievability before production starts.
What materials can you CNC mill?
We machine 100+ engineering-grade metals and plastics: Aluminum 6061/7075/2024, Stainless Steel 303/304/316/17-4PH, Titanium Grade 5, Brass C360, Copper C110, Magnesium AZ31, PEEK, POM (Delrin), Polycarbonate, ABS, Nylon, PTFE, UHMWPE, and PMMA. We also work with specialty composites and can source custom alloys on request. All materials carry certified traceability documentation and pass incoming inspection before machining.
How fast can I get CNC milled parts?
Simple CNC milled parts can be completed in as little as 1 business day. Most prototype orders complete in 3–5 business days. Production runs take 5–10 business days depending on quantity and complexity. We offer express DHL/FedEx shipping — parts reach US and EU customers in approximately 4 days after dispatch. Rush services are available — mention your deadline at quote stage.
What is the difference between CNC milling and CNC turning?
CNC milling uses rotating cutting tools moving against a stationary workpiece to create prismatic features — pockets, slots, holes, and complex 3D contours. CNC turning rotates the workpiece against a stationary tool, optimised for cylindrical parts like shafts, bushings, and threaded components. Many production parts require both — Great Light offers integrated milling and turning under one roof, eliminating inter-supplier delays and tolerance stack-up.
Do you offer DFM analysis for CNC milling projects?
Yes — Design for Manufacturability (DFM) analysis is included at no charge with every quote. Our engineers review your CAD files for issues such as excessively thin walls (under 0.8mm for metals), deep narrow pockets (depth > 4× width), sharp internal corners without relief, and non-standard thread sizes. We return actionable DFM feedback with your quote in under 2 hours — helping you avoid costly design revisions after production begins.
What surface finishes are available for CNC milled parts?
All surface finishing is performed in-house at Great Light, eliminating inter-vendor handoffs and dimensional risk. Available options: as-machined (Ra 1.6–3.2μm), sanding/polishing (Ra 0.4–0.8μm), bead blasting (Ra 1.0–2.0μm), Type II and III anodizing (clear, black, custom colour), powder coating, e-coating, nickel plating, chrome plating, electropolishing, and painted finishes. Parts ship assembly-ready with finishing specifications documented on the inspection report.
Is my IP protected when I submit files for a CNC milling quote?
Great Light is ISO 27001-certified for information security. We sign your NDA before any engineer reviews your design files. All uploads use encrypted transfer. Design data is stored on access-restricted servers — only the engineers assigned to your specific project can view your files. We have maintained this standard for 20+ years of manufacturing for clients with highly proprietary IP.
What Are The Applications Of CNC Milling?
The primary benefits of CNC machining for the appliance industry are speed, precision, and repeatability. It allows for the rapid production of complex and high-quality components with extremely tight tolerances, which is crucial for ensuring parts fit together perfectly and function reliably. This automated process also reduces human error, leading to consistent quality across large production runs, and minimizes material waste, which helps lower overall manufacturing costs.
Stop Settling for CNC Milling Suppliers Who Make You Wait and Wonder
Great Light exists for engineers who need precision parts delivered with the speed and transparency their project schedule actually demands. Upload your CAD files. Get a real engineering quote — with DFM feedback — in 2 hours.
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