Custom Online CNC Machining Services
Get on-time quotes for your metal or plastic CNC machining projects, from rapid prototyping to batch production.
- ISO 9001 & IATF 16949 Certified
- No MOQ Limit
- Lead Time in Less Than 3 Days
- Tolerance Down to ±0.01mm
- 45+ Materials and Surface Finishes Available
CEX High Precision CNC Machining Services
Equipped with over 50 sets of machines, including 3-, 4-, and 5-axis machining centers, CNC lathes, CNC milling machines, and a variety of supplementary equipment. We specialize in CNC machining of aluminum, stainless steel, brass, and other industrial metals and plastics.
From rapid prototypes to batch production, we ensure consistent quality and fast lead times. All processes are managed in-house under ISO 9001 and IATF 16949 standards for maximum precision and reliability.
We serve industries including automotive, robotics, medical, and industrial equipment, delivering dependable CNC machining solutions that bring your designs to reality.
| No. | Equipment Type | Quantity | Capability |
| 1 | Horizontal Machining Centers | 3 | • 4-axis with C-axis rotation • Double-station for simultaneous load/unload • Four-sided machining in one setup • Max work size: ~800 × 800 × 900 mm • Tolerance: ±0.01 mm |
| 2 | Gantry Machining Centers | 4 | • Side milling head equipped • Max work size: ~3000 × 1800 × 1200 mm • Tolerance: ±0.01 mm |
| 3 | Vertical Machining Centers | 5 | • 4-axis • Through-spindle coolant equipped for hard materials • Max work size: 860–1060 mm (X-travel) • Tolerance: ±0.01 mm |
| 4 | CNC Lathes | 2 | • Max work size (type 6180): Ø800 × 3000 mm, up to 8t load • Max work size (type 6150): Ø500 × 1500 mm • Tolerance: ±0.01–0.02 mm |
| 5 | Vertical Lathe | 1 | • Max work size: Ø1200 × 500 mm (height) • Tolerance: ±0.015 mm |
| 6 | EDM Machines | 4 | • Max work size: ~1200 × 800 × 500 mm • Tolerance: ±0.01 mm |
CNC Machining Services We Can Provide
CNC Machining Materials We Offer
We offer a wide selection of CNC machining materials for your custom parts. If you have any specific requirements, just let us know.
Aluminum
Lightweight and corrosion-resistant with excellent machinability and thermal conductivity; widely used in housings, brackets, and heat-dissipating parts for aerospace, automotive, and electronics.
Common Grades:
Aluminum 6061, 6061-T6, Aluminum 6063, 6063-T5, Aluminum 7075, 7075-T6, Aluminum 2024, Aluminum 5052, Aluminum 6082, etc
Available Finish:
As Machined, Anodizing, Hard Anodizing, Sandblasting, Polishing, Painting, etc
Stainless Steel
Highly corrosion-resistant and durable, with good strength and surface finish; commonly used in medical tools, food equipment, and high-precision mechanical parts.
Common Grades:
SUS303, SUS304, SUS304L, SUS316, SUS316L, SUS410, SUS420, SUS630/17-4PH, etc
Available Finish:
As Machined, Electropolishing, Pickling & Passivation, Brushing, Sandblasting, Mirror Polishing, etc
Carbon Steel
Strong and economical material with good machinability; often used in shafts, fixtures, and structural frames but requires surface treatment to prevent rust.
Common Grades:
1018, 1045, 4140, A36, 1215, Q235, S45C, etc
Available Finish:
As Machined, Black Oxide, Zinc Plating, Phosphating, Painting, Electrophoresis, etc
Alloy Steel
High strength and wear resistance due to added alloying elements; suitable for mechanical power transmission parts such as gears, axles, and heavy-duty shafts.
Common Grades:
4140, 4340, 8620, 4130, 40Cr, 20Cr, etc
Available Finish:
As Machined, Black Oxide, Heat Treatment, Chrome Plating, Phosphating, Hardening, etc
Tool Steel
High hardness, excellent wear resistance, and good dimensional stability; ideal for cutting tools, dies, molds, inserts, and high-stress mechanical parts.
Common Grades:
D2, A2, O1, H13, S7, M2, etc
Available Finish:
Polishing, Black Oxide, Nitriding, PVD Coating, Hard Chrome Plating, EDM Finish, etc.
Brass
Easy to machine and polish with good strength and conductivity; ideal for fittings, terminals, and decorative hardware.
Common Grades:
C360, C260, c268, C464, H59, H62, C272, C280, C377, etc
Available Finish:
As Machined, Nickel/Chrome Plating, Polishing, Sandblasting, etc
Copper
Excellent conductivity and thermal performance; used for electrical contacts, terminals, and heat sinks where high conductivity is required.
Common Grades:
C1201, C110, C101, C102, T1, T2, C103, C122, etc
Available Finish:
As Machined, Polishing, Sandblasting, Nickel Plating, Passivation, etc
Titanium Alloy
Strong yet lightweight, corrosion- and fatigue-resistant, biocompatibility; widely applied in aerospace fasteners, medical implants, and critical load-bearing parts.
Common Grades:
Ti-6Al-4V (Grade 5), CP-Ti (Grade 2), Ti-6Al-4V ELI (Grade 23), Ti-6Al-7Nb, etc
Available Finish:
As Machined, Sandblasting, Anodizing, Electropolishing, Polishing, Electroless Nickel, etc
ABS
Tough, impact-resistant thermoplastic with good dimensional stability and surface appearance; suitable for covers, control panels, and functional prototypes.
Common Types:
ABS-GP, Flame-Retardant ABS (UL94 V-0), High-Impact ABS, ABS+PC, etc
Available Finish:
As Machined, Sandblasting, Spray Painting, Powder Coating, Electroplating, etc
POM
High-stiffness engineering plastic with low friction and excellent wear properties; ideal for gears, cams, sliding rails, and precision mechanical parts.
Common Types:
Homopolymer POM, Copolymer POM, Lubricated POM, etc
Available Finish:
As Machined, Sandblasting, Polishing, Spray Painting, Tumbling, etc
PC
Optically clear with high impact strength and heat resistance material; used for safety shields, lenses, machine windows, and electronic housings.
Common Types:
Clear PC, Flame-Retardant PC, PC+10%/20% GF, PC-ABS, UV-Stabilized PC, etc
Available Finish:
As Machined, Sandblasting, Spray Painting, Brushed Finish, Tumbling, etc
PA (Nylon)
Durable and self-lubricating with low friction coefficients; commonly used for bushings, rollers, gear wheels, and structural support parts.
Common Types:
PA6, PA66, PA12, PA6/PA66+15%/30% GF, etc
Available Finish:
As Machined, Sandblasting, Painting, Powder Coating, Tumbling, etc
PE / HDPE
Chemically resistant and lightweight plastic with good toughness; commonly used in tanks, valves, pump components, and piping systems.
Common Types:
HDPE, HDPE+UV Stabilizer, UHMWPE, XLPE, etc
Available Finish:
As Machined, Sandblasting, Powder Coating, Painting, Tumbling, etc
PTFE (Teflon)
Exceptional chemical resistance, extremely low friction, and non-stick surface; used in seals, bearings, gaskets, and lab equipment.
Common Types:
Virgin PTFE, PTFE+15% GF, PTFE+MoS2, Expanded PTFE, etc
Available Finish:
As Machined, Sandblasting, Powder Coating, Brushed Finish, etc
PMMA (Acrylic)
Optically clear, UV-stable plastic with good surface hardness; ideal for displays, lighting covers, signage, and transparent machine guards.
Common Types:
Clear PMMA, Impact-Modified PMMA, Colored PMMA, UV-Blocking PMMA, etc
Available Finish:
As Machined, Sandblasting, Painting, Tumbling, etc
PEEK
High-performance polymer with superior thermal (up to 250°C) and chemical stability; used in aerospace, medical implants, semiconductor, and fluid handling components.
Common Types:
Virgin PEEK, Glass-Filled PEEK, PEEK+30% GF, PEEK+30% CF, PEEK+PTFE, etc
Available Finish:
As Machined, Sandblasting, Polishing, Painting, etc
CNC Machining Surface Finishes We Offer
Looking for the suitable surface finish for your CNC machining parts? We offer a wide selection of CNC machining surface finishes for both functional and aesthetic needs.
Anodizing
Increases corrosion resistance and surface hardness; adds vibrant color options; ideal for aluminum parts in automotive and aerospace.
Passivation
Removes surface iron from stainless steel to prevent rust and enhance corrosion resistance without influencing dimensions or appearance.
Electropolishing
Improves surface finish, removes micro-burrs, enhances corrosion resistance; used in medical, food-grade, and precision applications.
Powder Coating
Durable, chip-resistant surface finish with uniform thickness and excellent wear resistance; suitable for indoor and outdoor metal parts.
Spray Painting
Versatile and cost-effective color finish that improves product appearance; provides mild corrosion resistance and surface protection.
Sandblasting
Produces a uniform matte surface by blasting abrasive media; removes tool marks and prepares parts for the following spray painting or coating.
Mirror Polishing
Produces a highly reflective, mirror-like surface; ideal for premium aesthetics and optical clarity; often used on stainless steel, aluminum, and plastics.
Brushed Finish
Adds linear, directional texture to metal surfaces; reduces glare and visible fingerprints while giving an elegant, modern industrial look.
Black Oxide
Forms a dark, matte conversion layer on steel, providing mild corrosion resistance; enhances appearance and reduces light reflection.
Zinc Plating
Economical anti-corrosion coating for steel parts; provides a durable protective layer that slows rust and improves part lifespan.
Nickel Plating
Offers a bright, decorative finish with enhanced wear and corrosion resistance; commonly used in both industrial and cosmetic applications.
Chrome Plating
Hard, mirror-like surface with excellent wear resistance and a premium aesthetic look; commonly used in tools, appliances, and trim parts.
Quality Control and Sustainability at CEX
ISO 9001:2015 & IATF 16949:2016 Quality Control Systems
At CEX Casting, we deliver high-precision CNC machined parts with strict process control and consistent quality. Our ISO 9001 and IATF 16949 certifications reflect robust systems across all stages, including material selection, toolpath programming, and final inspection.
These certifications validate our ability to meet global standards, including the demanding requirements of automotive CNC machining. We ensure full traceability, stable dimensional accuracy, and reliable delivery for both prototypes and production runs.
Our In-House Quality Inspection Laboratory
Coordinate Measuring Machine (CMM) with a measurement range of 800×1200×600 (mm) and a Maximum Permissible Error (MPE) of 3.0 μm
Digital Height Gauge, 0–600 (mm), with resolution of 0.001 mm
Full Range Vernier Caliper, 0–100–150–200–300–600–1000 (mm), with accuracy of ±0.02 mm
External/Internal Micrometers, 0–25–75–100–125–150 (mm) / 12–20–50–100 (mm), with resolution of 0.001 mm
Dial Indicator Set, measurement range 0–10 mm, resolution 0.01 mm
Surface Roughness Tester, Ra 0.01–50.0 μm, with resolution of 0.001 μm
Thread Plug/Ring Gauges, covering M2 to M24 metric sizes and UNC/UNF imperial standards
Go/No-Go Gauges, for fit tolerance checks, with tolerance range ±0.01 mm
Safety, Health, and Sustainability
CEX Casting is certified under ISO 14001:2015 and ISO 45001:2018, demonstrating our strong commitment to workplace safety, employee well-being, and environmental responsibility. We integrate health, safety, and sustainability principles into every stage of our production, ensuring that our production process operates with minimal environmental impact and maximum care for our people.
Why Choose Us
High-Precision Machining
With over 50 CNC machines, including 3-, 4-, and 5-axis machining centers, we achieve tolerances as tight as ±0.01mm for complex geometries across various metals and plastics.
Fast & Reliable Lead Time
Standard lead time is 7–10 working days. Over 92% of our orders ship on time or earlier, with prototype parts available in as fast as 3 days through our dedicated fast-track line.
Full Material & Finish Capability
We support 30+ metals and plastics including aluminum, stainless steel, brass, PA, and ABS, with 15+ surface finishes like anodizing, polishing, electroplating, and spray painting.
Rigorous Quality Control
Certified to ISO 9001 and IATF 16949, we ensure every part meets strict standards using CMMs, projectors, surface testers, etc. Full inspection reports are available upon request.
Engineering & DFM Support
Our team reviews drawings within 24 hours and provides manufacturability analysis and material selection advice to help you optimize cost, function, and production efficiency.
No MOQ & Flexible Quantities
Whether you need 1 prototype or thousands of production units, we support all volumes without MOQ restrictions; ideal for startups, pilot runs, or scalable mass production.
CNC Machined Parts We Have Developed
CNC Machining FAQ
How Do You Guarantee Consistent Precision Across Parts?
Machine Calibration
All CNC machines are calibrated on a schedule using precision instruments. Tool offsets and spindle accuracy are verified before every job to ensure consistent results.
In-Process Inspections
During machining, we conduct dimensional checks at regular intervals using micrometers, calipers, and CMMs to catch any deviation early and prevent batch-wide errors.
Documented Workflows
We maintain process sheets detailing fixture setup, cutting tools, speeds, and inspection points. Operators follow these strictly to maintain consistency across runs.
Final Quality Checks
Every part goes through a final inspection using calibrated equipment. Detailed inspection reports can be provided, including GD&T checks, surface finish, and dimensions.
Will Complex Features Like Undercuts or Concave Curves Cost Extra?
Yes, complex features generally cost extra. Here’s why:
Advanced Machining Requirements
Features like undercuts often require multi-axis machining or multiple setups, significantly increasing programming time, fixture design, and toolpath verification steps.
Tooling Considerations
Small or custom tools are often required to reach tight geometries. These tools wear faster and require special feed/speed adjustments, increasing cycle time and cost.
Efficiency Trade-Offs
We assess each complex feature during DFM review and offer design simplification suggestions where it saves cost without compromising function or design intent.
Can You Machine Parts with Thin Walls Without Deformation?
Yes, thin-walled parts can be machined without deformation. Here’s why:
Optimized Toolpaths
We program high-speed, low-force toolpaths that minimize cutter pressure, using multiple shallow passes to avoid part deflection or vibration-induced chatter.
Proper Fixturing
Thin-walled parts are secured using vacuum fixtures or soft jaws that spread clamping pressure. This reduces distortion during cutting and maintains part integrity.
Thermal Control
Heat buildup is controlled with mist or air cooling to avoid thermal expansion. For long runs, we also schedule breaks between passes to allow heat dissipation.
Machining Strategy
We machine internal features first to preserve wall strength during finishing cuts. This reduces flexing and improves dimensional stability on final dimensions.
How Do You Deal with Hard-To-Machine Materials?
Material Knowledge
We machine stainless, titanium, and tool steels regularly. Our team understands their unique behaviors, such as work hardening or poor heat conductivity, and plans accordingly.
Cutting Tools & Speeds
We use carbide tools with special coatings (e.g., TiAlN), low feed rates, and high-pressure coolant systems to reduce tool wear and keep temperatures under control.
Machine Rigidity
Our CNC machines feature high spindle torque and reinforced beds, which prevent vibration and maintain cutting accuracy when dealing with high-resistance materials.
How Do You Deal with Tool Marks or Machining Lines on the Surface?
Toolpath Optimization
Finishing passes are done with small stepovers and tight tolerances at higher RPMs to minimize visible lines. This ensures uniform surface appearance across areas.
Secondary Finishing Options
We offer bead blasting, polishing, and brushing to remove tool marks. For aluminum, we also provide anodizing to enhance appearance while protecting the surface.
Material Sensitivity
Aluminum and plastics show tool marks more easily. For these, we recommend finer finishing passes or a specific post-processing step based on the part’s end use.
Customer Preferences
If different surfaces require different finishes, we segment toolpaths accordingly and mark finish zones clearly in the job order and quality control checklist.
Can You Combine CNC Machining with Other Processes Like Casting or Welding?
Casting + Machining
We machine castings to refine surfaces, bores, and threads where tight tolerances are needed. Machining helps compensate for casting variation and shrinkage.
Welding + Machining
Post-weld machining corrects warpage and restores key dimensions like flatness, hole position, or concentricity for parts that need precise final assembly.
Why Combine Processes
Combining processes reduces material waste and speeds up production for complex shapes. It’s often more economical than machining from solid blocks.
Application Advice
Our team evaluates your design to suggest the best mix of processes for function, tolerances, and cost, whether you need strength, weight savings, or both.
What Factors Influence the Lead Time for CNC Machined Parts?
Material Availability
We stock aluminum, brass, stainless steel, and plastic materials in common sizes. Rare alloys and plastics may require 2–5 extra days to source, depending on region and quantity.
Part Complexity
Deep pockets, multiple faces, or critical tolerances increase both CAM programming and cycle times. 5-axis jobs may require special fixturing and simulation.
Order Quantity
Prototypes can be delivered within 3 days. For batch runs, we balance spindle availability, tooling wear, and QC time to meet the schedule efficiently.
Surface Finish
If surface finishes or treatments are required, such as anodizing or powder coating, additional lead time of 2–7 days is usually needed based on finish type.
How Do You Prevent Deformation in Thin-Walled or Large CNC Machined Parts?
Stress Relief and Pre-treatment
Heat-treated or aged materials reduce internal stresses that cause movement during machining. We use certified stock or provide in-house aging if needed.
Symmetrical Machining Strategy
We remove material in balanced steps from all sides, allowing stress to be released evenly. This helps minimize warping or bending, especially on long parts.
Custom Fixtures
We design part-specific jigs or vacuum clamping systems that spread pressure. This minimizes flexing and helps maintain geometry throughout the operation.
Controlled Cutting Parameters
Light cuts with low engagement and intermittent cooling cycles keep heat and vibration low. These parameters are fine-tuned per part using simulation feedback.
Can You Provide Traceability for Machined Parts and Materials?
Material Certificates
If needed, we provide original Mill Test Reports (MTRs) from suppliers for every batch of material, ensuring compliance with international standards like ASTM or DIN.
Inspection Reports
FAI reports, CMM dimensional logs, and surface roughness graphs can be supplied. These are tied to job numbers and included with shipments on request.
Batch-Level Tracking
Every production run has a unique ID in our ERP. It links the part to the operator, machine used, material batch, inspection records, and final destination.
Part Marking
Laser or dot peen engraving is available to mark serial numbers, version codes, or customer-specific trace IDs directly on the part surface or tag.
How Do You Choose Cutting Tools for Different Materials in CNC Machining?
Material Properties
We analyze machinability, hardness, and chip formation of each material. For instance, brass uses uncoated tools, while steel needs coated carbide or ceramics.
Part Geometry
Deep cavities or small fillets require tools with special lengths or corner radii. We choose tools that minimize deflection while accessing required features.
Surface Finish Goals
We select tools based on Ra requirements. For sub-1.6 μm, we use polished tools with tight runout; for mirror finishes, diamond-coated tools may be used.
Efficiency vs. Cost
We balance cycle time, tool life, and surface quality. For low-volume jobs, standard tools suffice; for mass production, we optimize for wear and tool change time.
What Surface Finishes Can Be Achieved Directly Through CNC Machining?
As-Machined Finish
This standard finish shows visible tool marks with surface roughness ranging from Ra 3.2 to 6.3 μm. It’s typically used where aesthetics are not a priority.
Fine Finish Passes
We reduce stepover, increase RPM, and use sharp tools to reach Ra 0.8–1.6 μm. No post-processing is needed when basic smoothness or a clean appearance is required.
For Tighter Requirements
For Ra below 0.8 μm, we use fine-grain carbide cutters at high speed, with optional lapping or polishing. Fixturing and thermal control are optimized to reduce distortion.
Mirror Finish (Material Dependent)
On materials like aluminum or brass, diamond tooling and ultra-fine passes can achieve Ra 0.2–0.4 μm. Cutting fluid, speed, and feed are strictly managed.
How Do You Handle CNC Orders with Mixed Materials or Multiple Parts in an Assembly?
Multi-Material Machining
We routinely machine stainless steel, aluminum, and plastics together. Our workflows ensure that toolpaths, feeds, and coolant types are matched to each material’s specific properties.
Assembly Fit Checks
We pre-assemble or dry-fit components as needed to ensure that tolerances align, especially for mating surfaces, hole locations, and fastener clearances.
Surface Treatment Coordination
Each material gets a compatible finish. For instance, aluminum gets anodized, while stainless steel parts are passivated. We track this per part and batch.
Packing and Labeling
Parts are clearly labeled, bagged, or kitted according to the assembly instructions. We can also pre-assemble sub-units and ship with alignment jigs or protective foam.
How Do You Ensure Dimensional Accuracy in Complex 3D Geometries?
Multi-Axis Machining
4-axis and 5-axis equipment minimizes part repositioning, preserving alignment and allowing seamless tool transitions across compound curves or angled faces.
On-Machine Probing
We use probing cycles to verify part location before cutting starts. This reduces setup error and ensures critical 3D surfaces are precisely aligned.
CAM Simulation
Toolpaths are fully simulated for collision avoidance and tolerance control. This helps prevent gouging or inconsistent stepovers on organic geometry.
Final Quality Inspection
We verify results using CMMs and profile projectors, especially for aerospace or medical-grade parts requiring verification of curvature, symmetry, and depth.
What Industries Does Your CNC Machining Service Commonly Support?
- Automotive & EV: sensor brackets, heat sink bases, shift linkages, pedal levers, cable clamps
- Robotics & Automation: end-effector plates, linear rail mounts, encoder housings, joint spacers, motor brackets
- Medical & Laboratory: syringe flanges, valve connectors, pump brackets, diagnostic fixture plates
- Electronics & Semiconductors: mounting frames, thermal interface blocks, aluminum enclosures, PCB support plates
- Industrial Machinery: guide blocks, bearing housings, clamping jaws, adjustment knobs, precision flanges
Can I Update or Revise My Design During CNC Production?
Yes, design changes are allowed during production, but feasibility depends on machining progress and the updated scope.
Revision Window
Designs can usually be revised before final machining begins. Once roughing or finishing starts, changes may be limited or require extra cost.
Impact Assessment
We evaluate how the update affects toolpaths, setups, or fixtures. If it impacts delivery or pricing, we’ll send an updated quote and lead time for approval.
Quick CAM Reprogramming
Minor edits like hole diameter or chamfer tweaks can often be reprogrammed and resumed within 24–48 hours, especially if the tooling is unaffected.
Communication Workflow
We confirm design updates with annotated drawings or revised models, and don’t proceed without written approval to avoid confusion or version conflicts.