![]()
CNC Machining — Precision Milling, Turning & Multi-Axis Solutions
What is CNC Machining?
CNC machining is a precision subtractive manufacturing process that transforms raw stock (bars, billets, extrusions, castings) into finished components by removing material with computer-controlled tools. Using mills, lathes and multi-axis machining centers, CNC machining delivers tight tolerances, repeatable geometries and excellent surface finishes for both prototypes and high-volume production.
Why choose CNC for your parts?
Micron-level accuracy: We routinely achieve tolerances down to ±0.005 mm for critical features; precision turning can reach ±0.003 mm, and multi-axis work for complex geometries is controlled to ±0.008 mm.
Versatility: Metals, plastics and composite materials — from 6061-T6 aluminum and 303/304 stainless to 20Cr/40Cr steels, brass (HPb59-1), POM, PTFE and PEEK.
Faster validation: Rapid prototyping and quick turnaround for testing and design validation.
Integrated finishing: Machining plus downstream operations (hardening, grinding, anodizing, plating) reduce suppliers and lead time.
Design for manufacturability (DFM): Add threads, knurling, ribs or logos directly to parts to eliminate secondary assembly steps.
Our CNC Machining Categories
To meet diverse application requirements, NBI provides CNC machining solutions across three major material groups. Each category is optimized with dedicated processes, cutting tools, and surface finishing options to ensure the best performance for your product.
Aluminum is one of the most widely used CNC materials thanks to its excellent strength-to-weight ratio, corrosion resistance, and outstanding machinability.
We work with popular alloys such as 6061-T6, 6063, A356-T6, A380, ADC12, and 7075, delivering highly precise components suitable for lightweight structural designs and heat-dissipation applications.
Common Applications:
Heat sinks and thermal housings
Electronic enclosures and brackets
Mechanical components with anodized surfaces
High-precision industrial parts
Steel machining is ideal for strength-critical and wear-resistant applications.
We work with a wide range of steels including 20#, 40Cr, 45#, 12L14, and stainless steels such as 303, 304, and 316.
With advanced turning, milling, grinding, and heat treatment processes, we produce components with tight tolerances and exceptional durability.
Common Applications:
Shafts, pins, sleeves, and threaded connectors
Tooling parts and power-transmission components
Valve cores, fittings, and pressure-resistant parts
Precision-ground shafts and custom mechanical assemblies
Plastic machining is used for lightweight, non-conductive, and corrosion-resistant components.
We specialize in engineering plastics such as POM, PTFE, Nylon, PEEK, ABS, and Acrylic, producing clean, burr-free surfaces suitable for high-precision assemblies.
Common Applications:
Bushings and bearings
Insulation components and connectors
Custom rods, spacers, and functional prototypes
Medical and electronic structural parts
Our CNC Capabilities
Process types: CNC milling, CNC turning, 3/4/5-axis simultaneous machining, wire-EDM, grinding, drilling and tapping.
Tolerance & repeatability: Standard capability ±0.005 mm, precision turning ±0.003 mm, 5-axis complex features ±0.008 mm. Custom tolerances available by request.
Materials: Aluminum alloys (6061, A356, ADC types), carbon steels (20Cr, 40Cr), stainless steels (303, 304, 416), brass, copper alloys, titanium, POM, PTFE, and engineering plastics.
Part types: Shafts, fittings, housings, connectors, heat sinks, bushings, flanges, pistons, threaded inserts and precision assemblies.
Batch size: Prototyping, small runs and high-volume production — we tailor tooling and process plans to optimize unit cost and quality.
Equipment & Technology
Multi-axis CNC machining centers (3/4/5 axis) for complex contours and single-setup machining.
CNC lathes / turning centers for high-accuracy rotational parts.
Wire-EDM for tight internal profiles and intricate features.
Dedicated grinding and finishing cells for surface flatness and concentricity.
CNC tool presetters, automatic tool changers and efficient workholding systems for repeatable throughput.
Metrology: Coordinate Measuring Machines (CMM), surface profilometers, micrometers, thread gauges and custom fixtures.
Secondary Operations & Surface Finishes
We provide in-house finishing to deliver parts ready for assembly or market:
Anodizing (clear, black, color), powder coating, nickel / chrome plating, passivation (stainless), vibration polishing, shot/sand blasting, and heat treatment / hardening.
Mechanical assemblies: press-fits, O-rings, thread inserts, bonded seals and sub-assembly work as requested.
Quality Control & Documentation
Quality is embedded in every step:
Incoming material verification and full traceability.
First article inspection (FAI) and free sample reports with material certificates and dimensional measurement.
In-process inspection and final CMM verification before shipment.
Production records, inspection reports and customer-requested documentation (PPAP/FAI style deliverables) available on demand.
Industries We Serve
Automotive & EV: engine components, shafts, sensor housings.
Industrial & Automation: gearboxes, pump parts, robotic end-effectors.
Medical & Diagnostics: surgical instruments, precision implants and micro components.
Electronics & Lighting: heat sinks, connector pins, housings.
Aerospace & Defense: structural brackets, fuel system components (per customer spec).
Industry Trends & Our Readiness
Smart manufacturing: predictive maintenance and real-time quality monitoring to reduce downtime.
Hybrid workflows: combining additive manufacturing (for lightweight or conformal features) with subtractive finishing.
Green machining: energy-efficient practices, material optimization and waste reduction.
Micro-machining: rising demand for miniaturized, high-precision parts in medical and electronics markets.
Why NBI for CNC Machining?
15+ years of focused experience in precision machining and custom components.
Full-service supplier: design for manufacturability, prototyping, precision machining, finishing and assembly — one partner for complete part delivery.
Engineer support: blueprint review, reverse engineering and manufacturability feedback included with quotes.
Quality first: sample reports, CMM inspections and strict process controls to ensure consistent delivery.
Ready to start?
Send us your drawing (STEP, DWG or PDF) for a free DFM review and fast quote. We’ll return material certificates, a full dimensional report for samples and a production plan tailored to your schedule.
Start Your Project
