ISO 9001 & AS9100 CNC manufacturing
CNC Machining Services
CNC machining services transform your CAD designs into precision parts by removing material from a solid workpiece using computer-controlled cutting tools. Whether you need one prototype or ten thousand production parts, the right CNC machining partner delivers consistent quality, tight tolerances, and reliable lead times.
At Baetro, we provide CNC machining services with instant online quoting, no minimum order quantities, and standard lead times of just 3-7 days. Our Qingdao facility runs 30+ CNC machines, including 5-axis simultaneous centers, producing parts with tolerances as tight as ±0.001 inch.
±0.001″Standard tolerance
3-7 daysStandard lead time
50+Materials
30+CNC machines
Key Takeaways
CNC machining services built for engineering buyers
Core quoting, quality, material, and inspection details for engineers comparing CNC machining suppliers.
60 secLive instant quotes
1-100,000No minimum order
3-7 daysStandard lead time
ISO + AS9001 & AS9100
50+Metals and plastics
FreeDFM on every quote
Capabilities
Comprehensive CNC Machining Capabilities
Not every part fits the same process. Baetro offers a full range of CNC machining capabilities under one roof, so buyers do not have to coordinate multiple suppliers for a single project.
Milling / 3-axis to 5-axis
CNC Milling Services
CNC milling uses rotating cutting tools to remove material from a stationary workpiece, producing prismatic shapes, contoured surfaces, pockets, slots, and complex 3D geometries.
- 3-axis milling: standard prismatic parts with faces, slots, and pockets.
- 4-axis milling: indexed rotation for multi-face machining and fewer setups.
- 5-axis milling: complex geometries in one setup to reduce repositioning error.
Turning / Swiss machining
CNC Turning Services
CNC turning rotates the workpiece against a stationary cutting tool, making it ideal for shafts, bushings, fittings, threaded components, and small-diameter precision hardware.
- CNC lathe turning: diameters up to 450 mm and lengths up to 1500 mm.
- Swiss machining: slender parts down to 1 mm with tolerances to ±0.0002 inch.
- Live tooling: cross-holes, flats, slots, and milled features in one setup.
Drilling / Grinding / EDM
Additional CNC Processes
Secondary CNC processes support holes, sealing surfaces, hardened materials, sharp internal corners, and mold details that cannot be solved efficiently by milling or turning alone.
- Deep hole drilling: drilled, tapped, reamed, and gun-drilled features above 20:1.
- CNC grinding: bearing seats, seal surfaces, cylindrical forms, and gauge blocks.
- EDM machining: wire EDM cuts and sinker EDM cavities in hardened materials.
Procurement confidence
Why Engineers Choose Baetro for CNC Machining
Choosing a CNC machining partner is about confidence that parts will arrive on time, meet specifications, and work in the assembly the first time.
Instant Quotes in 60 Seconds
Upload STEP, STL, or IGES files and receive live pricing and lead times immediately. The quoting engine analyzes geometry, material, tolerances, and finish requirements to calculate accurate pricing.
No Minimum Order Quantity
The custom CNC machining process is identical whether the order is 1 piece or 100,000 pieces. This supports design validation prototypes, low-volume production, bridge manufacturing, and spare parts.
3-7 Day Standard Lead Times
Standard lead time for machined parts is 3-7 days from order confirmation to shipment, with expedited options for urgent prototypes and 24/7 manufacturing operations.
Free DFM Feedback on Every Quote
Engineers review wall thickness, internal corners, tolerance stackups, and features that could be redesigned to reduce machining time. DFM feedback often reduces machining cost without compromising function.
ISO 9001 & AS9100 Certified Quality
Baetro uses an ISO 9001:2015 quality management system, AS9100D aerospace quality standards, CMM inspection, surface roughness testing, inspection reports, and material traceability.
Inspection documentation
Full inspection reports are provided with every shipment, with tight-tolerance features verified on CMM equipment and material traceability maintained from raw stock to finished part.
Finished parts showcase
Showcase of Finished CNC Machined Parts
Representative machined components showing how material choice, process route, and finish requirements translate into production-ready parts.
Material library
CNC Machining Materials
Material selection balances mechanical properties, corrosion resistance, machinability, and cost. Baetro machines 50+ materials across metals and plastics.
Metals
Aluminum: lightweight, corrosion-resistant, and highly machinable. Common grades include 6061-T6, 7075-T6, and cast aluminum.
See our aluminum CNC machining options
Stainless Steel: strong and corrosion-resistant. 304 suits general applications; 316 performs well in marine, chemical, and medical environments.
View stainless steel CNC machining capabilities
Carbon Steel: cost-effective and strong for structural components, tooling, and non-corrosion-critical parts.
Brass: excellent machinability and natural corrosion resistance for fittings, valves, decorative parts, and electrical components.
Titanium: high strength-to-weight ratio, biocompatibility, and corrosion resistance for aerospace and medical applications.
Copper: superior electrical and thermal conductivity for heat sinks, contacts, and bus bars.
Plastics
PEEK: high-performance polymer with mechanical strength, chemical resistance, and biocompatibility.
ABS: tough, impact-resistant, and cost-effective for prototypes, enclosures, and consumer product components.
Nylon (PA6, PA66): wear-resistant, low-friction material for bushings, bearings, gears, and sliding components.
POM (Delrin/Acetal): low friction, high stiffness, and dimensional stability for precision mechanical parts.
Polycarbonate: transparent, impact-resistant plastic for optical components and protective covers.
Acrylic (PMMA): clear plastic for optical and display components.
Post-processing
Surface Finishes & Post-Processing
A machined part is rarely complete without finishing. Surface treatments improve appearance, corrosion resistance, wear properties, and electrical characteristics.
| Finish | Description | Best For |
|---|---|---|
| As-machined | Raw machined surface, tool marks visible | Internal, non-cosmetic parts |
| Bead blasted | Matte, uniform surface | Cosmetic parts, pre-anodizing prep |
| Anodizing (Type II) | Thin colored oxide layer | Decorative and mild corrosion protection |
| Anodizing (Type III) | Thick hardcoat, natural gray | Wear surfaces, extreme durability |
| Powder coating | Durable colored coating | Outdoor, industrial applications |
| Polishing | Mirror-smooth surface | Decorative, optical, low-friction |
| Black oxide | Thin black conversion coating | Stealth appearance, mild corrosion resistance |
| Chromate passivation | Clear or yellow coating | Aluminum corrosion protection |
| Nickel plating | Corrosion-resistant metal layer | Electrical conductivity, wear resistance |
| Chrome plating | Hard, reflective metal layer | Decorative, extreme wear resistance |
| Painting | Custom color coating | Brand-matched components |
Engineers recommend the optimal surface treatment during the DFM review based on the part application.
Engineering data
CNC Machining Tolerances & Specifications
Tolerance defines how much a dimension can vary from its specified value. Specifying the right tolerance for each feature is one of the fastest ways to optimize part cost.
Standard Tolerances
| Feature Type | Standard Tolerance | Tight Tolerance |
|---|---|---|
| Linear dimensions | ±0.001″ (±0.025 mm) | ±0.0005″ (±0.013 mm) |
| Hole diameter | ±0.001″ (±0.025 mm) | ±0.0005″ (±0.013 mm) |
| Hole position | ±0.005″ (±0.13 mm) | ±0.002″ (±0.05 mm) |
| Angularity | ±0.5° | ±0.25° |
| Surface roughness | Ra 125 µin (3.2 µm) | Ra 63 µin (1.6 µm) |
Reserve tight tolerances for features that genuinely need them, such as press fits, bearing seats, mating surfaces, and critical dimensions.
Part Size Limits
- Max turning diameter: 450 mm
- Max turning length: 1500 mm
- Max milling envelope: varies by machine; contact us for large part inquiries
- Minimum wall thickness: 0.5 mm, depending on material and geometry
Applications
Industries We Serve
CNC machining supports modern manufacturing across aerospace, medical devices, automotive, electronics, robotics, industrial equipment, and energy applications.
Industry
Aerospace
Structural brackets, housings, and fittings requiring AS9100-certified processes and tight tolerances.
Industry
Medical Devices
Surgical instruments, diagnostic equipment, and implant-grade components with traceability.
Industry
Automotive
Custom brackets, engine components, and prototyping parts for iterative design cycles.
Industry
Robotics
Precision joints, frames, and end-effector components for smooth motion and positioning.
Additional applications: electronics enclosures, heat sinks, mounting hardware, industrial wear parts, tooling, structural components, turbines, pumps, and valves.
How it works
The Baetro Process: From CAD to Finished Part
A controlled route from CAD upload through quoting, machining, inspection, documentation, and shipment.
Upload Your CAD File
Submit your design in STEP, STL, or IGES format. The system accepts files from SolidWorks, Fusion 360, CATIA, Inventor, and most major CAD platforms.
Receive Instant Quote + DFM Feedback
In under 60 seconds, see price, lead time, and manufacturability analysis with engineering feedback on potential issues.
Confirm Your Order
Select material, finish, and quantity, then pay securely online. Standard orders do not require purchase orders.
Precision Manufacturing
Parts are machined on 30+ CNC centers by experienced operators, with in-process inspections to catch issues early.
Quality Verification
Every part undergoes dimensional inspection. Tight-tolerance features are verified on CMM equipment, with inspection reports included.
Express Delivery
Parts ship via DHL, FedEx, or UPS with customs documentation and real-time tracking from facility to destination.
DFM guidance
CNC Machining Design Guidelines
Good design reduces machining time, lowers cost, and improves part quality. These are the guidelines reviewed during DFM analysis.
Internal Radii
Design internal corners with radii rather than sharp corners. A radius equal to or larger than the end mill radius reduces tooling needs and machining time.
Wall Thickness
Thin walls under 0.020 inch in metal or under 0.040 inch in plastic can vibrate during machining. Add ribs or increase thickness where possible.
Threads
Standard UNC and UNF threads are most economical. Avoid custom pitches unless necessary and specify thread depth at 1.5× diameter for strength.
Undercuts
T-slots, dovetails, and O-ring grooves require special tooling. Minimize undercuts or use standard sizes to avoid custom tool costs.
Text and Lettering
Raised text machines better than recessed text. Minimum character height of 0.020 inch ensures readability.
Tolerances
Only specify tight tolerances where function requires it. DFM review identifies over-toleranced features before production.
Site architecture links
Related CNC machining pages
Move into process-specific, material-specific, and precision machining pages when your project needs a narrower manufacturing route.
Child page
EDM Machining
Wire EDM and sinker EDM for hardened materials, cavities, and sharp internal geometry.
Related page
5 Axis CNC Machining
Simultaneous 5-axis machining for multi-face parts and complex contours.
Related page
Precision CNC Machining
Tight-tolerance machining, CMM inspection, and quality documentation.
Related page
Prototype CNC Machining
Fast CNC prototypes for design validation, testing, and bridge manufacturing.
FAQ
CNC Machining Services: Frequently Asked Questions
Answers to the questions engineers and sourcing teams usually ask before uploading drawings or CAD files.
What is CNC machining?
CNC (Computer Numerical Control) machining is a subtractive manufacturing process where computer-controlled machine tools remove material from a solid workpiece to create precision parts. A CAD file guides the machine movements, producing repeatable results with tolerances as tight as ±0.0002 inch.
How much do CNC machining services cost?
Cost varies by material, part complexity, tolerance requirements, and quantity. A simple aluminum bracket in low volume might cost $20-50. A complex stainless steel part with tight tolerances could cost $200 or more. The fastest way to know your exact price is to upload your CAD file for an instant quote.
What materials can be CNC machined?
Virtually any machinable material. Metals include aluminum, stainless steel, carbon steel, brass, titanium, and copper. Plastics include ABS, nylon, PEEK, POM, polycarbonate, and acrylic. If a material is not listed, Baetro can likely source it.
How long does CNC machining take?
Standard lead time is 3-7 days from order confirmation to shipment. Expedited options are available for urgent prototypes. Shipping time depends on location and selected shipping method.
Do you have a minimum order quantity?
No. You can order 1 piece or 100,000 pieces. The quality process is identical regardless of quantity, with no setup penalties or hidden fees for small orders.
What file formats do you accept?
Accepted file formats include STEP (.stp, .step), STL (.stl), IGES (.igs, .iges), SolidWorks (.sldprt), and Parasolid (.x_t). STEP is preferred for CNC machining quotes.
What tolerances can you achieve?
Standard tolerance is ±0.001 inch (±0.025 mm). Tighter tolerances down to ±0.0005 inch are available on request, depending on part geometry and material. Every part is inspected, and full inspection reports are provided with tight-tolerance orders.
Do you offer surface finishing?
Yes. Baetro offers 10+ in-house finishes including anodizing, powder coating, bead blasting, polishing, plating, and painting. Parts can ship finished and ready for assembly.
How do you ensure quality?
Baetro is ISO 9001 and AS9100 certified. Every part receives dimensional inspection, tight-tolerance features are verified on CMM equipment, and inspection reports and material traceability are provided.
Can you ship internationally?
Yes. Baetro ships to customers in 30+ countries via DHL, FedEx, and UPS, with commercial invoices, packing lists, certificates of origin, and DDP shipping where available.
Quote-ready manufacturing
Ready to Get Your CNC Machining Quote?
Stop waiting days for a machining quote. Upload your CAD file and see your exact price and lead time in under 60 seconds. No minimum order. No hidden costs. No obligation.
Every quote includes free DFM feedback from the engineering team. Every order ships with full inspection documentation. Whether you need one prototype or ten thousand production parts, Baetro delivers precision CNC machining services with speed, transparency, and engineering support.
No credit card required for quotes. Free DFM feedback included. Parts ship in as little as 3 days.