What is CNC Machining?

Explore design for machinability, material properties, finishing options, and more for milled and turned parts 

What is CNC Machining?

Computer Numerical Control (CNC) machining is a subtractive manufacturing process that uses pre‑programmed computer software to control the movement of factory tools and machinery. The process can control a range of complex machinery, from grinders and lathes to mills and routers. With CNC machining, three-dimensional cutting tasks can be accomplished in a single set of prompts.

At Konlida Precision Technology, we combine decades of machining expertise with a digital manufacturing workflow. Our advanced 3‑axis, 4‑axis, and 5‑axis machining centers — including DMG MORI and MAZAK equipment — achieve tolerances as tight as ±0.002mm. Unlike 3D printing, which adds material layer by layer, CNC machining starts from a solid block or cylinder and precisely removes material to create the final geometry.

⚙️ Digital thread from CAD to part. Every uploaded 3D CAD model undergoes automated DFM analysis. After approval, G‑code is generated and sent directly to our machining centers — reducing lead times and eliminating manual translation errors.
🖥️ Konlida's 5‑axis DMG MORI machining center in operation — precision cutting of aerospace-grade aluminum.

Advantages and Common Applications

Key Benefits

  • Unmatched accuracy & repeatability — ±0.002mm typical, ideal for tight-tolerance components.
  • Production-grade materials — machine any metal or engineering plastic.
  • Scalable economics — per‑part cost decreases significantly with volume.
  • Fast lead times — prototype parts in as few as 3‑5 days.
  • Superior mechanical properties — no anisotropy, fully dense parts.

Typical Applications

  • Functional prototypes & pilot runs
  • Medical instruments & implants
  • Aerospace structural components
  • Automotive powertrain parts
  • Semiconductor equipment components
  • Fixtures, jigs, and custom tooling

CNC machining is often the fastest, most cost-effective route for low‑to‑medium volume production and for parts that require tight tolerances or materials not available in 3D printing. Explore our full CNC machining services →

Design for CNC Machining: 8 Key Principles

Designing parts with manufacturability in mind reduces cost, lead time, and quality issues. Follow these guidelines when creating parts for CNC machining:

1. Keep it simple

Break multi‑faceted parts into assemblies. Avoid swept surfaces unless critical. Design features that can be cut from one side to avoid multiple setups.

2. Specify tolerances only when needed

Tighter tolerances increase cost. Use standard block tolerances unless a feature requires special attention.

3. Avoid engraved or raised text

Laser marking or ink stamping is more economical. Raised text requires milling away everything around it.

4. Watch tall walls and deep pockets

Carbide tools have a practical stick‑out of 4× diameter. Deep features cause chatter and poor finish.

5. Thin walls are risky

Walls thinner than 0.8mm (0.032") are difficult to machine without deflection.

6. Deep holes add cost

Holes deeper than 5× drill diameter require special techniques. Keep threads to 2× diameter for best results.

7. Use radii in internal corners

Square internal corners are impossible to mill; they require EDM. Add a radius equal to your end mill size.

8. Design smart thread features

Tap threads for holes up to M12. For larger or deep threads, consider thread milling or inserts.

📘 For a complete set of design rules and DFM checklists, download our CNC Design Guide →

Materials for CNC Machining

Konlida machines virtually any solid material. Below are the most commonly requested categories. For full mechanical properties and data sheets, visit our Materials Resource Center →

Metals

  • Aluminum — 6061, 7075, 2024 (excellent machinability)
  • Stainless Steel — 303, 304, 316, 17‑4 PH
  • Steel Alloys — 1018, 4140, A2, D2, O1
  • Titanium — Grade 2, Grade 5 (Ti‑6Al‑4V)
  • Brass & Copper — C360, C110
  • Exotics — Inconel, Hastelloy, Monel

Plastics

  • PEEK — High strength, chemical resistance
  • PEI (Ultem) — High temperature, flame retardant
  • POM (Acetal/Delrin) — Low friction, dimensionally stable
  • ABS & PC — Impact resistant, good machinability
  • Nylon (PA6, PA66) — Tough, wear resistant
  • PTFE, HDPE, PP, Acrylic

We also support customer-supplied materials and provide full material traceability for regulated industries.

Threaded Holes for Machined Parts

Konlida offers a range of threading options for both milled and turned parts. Internal threads can be tapped or thread‑milled; external threads are available on turned parts.

  • Standard threads: UNC, UNF, Metric (coarse and fine)
  • Thread limits: H2 (standard), H3 (tight) — H3 increases cost significantly.
  • Threaded inserts: Heli‑Coil and key locking inserts available for plastics or soft metals.
  • Deep threads: Maximum thread depth of 2× diameter is recommended for tapping; thread milling can go deeper.

For design guidance on specifying threads in your CAD model, refer to our Threading Guide →

Finishing Options for Machined Parts

Enhance appearance, corrosion resistance, and wear properties with our in-house and partner finishing services.

Aluminum Anodizing

Type II (clear or black) for decorative and mild protection; Type III hardcoat (black) for wear resistance.

Chromate Conversion

Clear chromate for corrosion protection while maintaining electrical conductivity.

Passivation

For stainless steel parts to remove free iron and improve corrosion resistance.

Additional Finishes

Powder coating, painting, electropolishing, and nickel plating available upon request.

Typical lead time for finishing: 1‑3 days. View all finishing capabilities →

Quality Control & Certifications

All machined parts are subject to rigorous inspection protocols. Konlida maintains ISO 9001, AS9100D, IATF 16949, and ISO 13485 certifications.

  • Incoming material verification — certificates of conformance and material test reports.
  • In-process inspections — first article, statistical process control (SPC) on critical features.
  • Final inspection — using Hexagon CMM, Keyence optical measurement, and manual gauges.
  • Documentation — full dimensional reports, FAI, and material certifications available.
✅ CTQ (Critical‑to‑Quality) process — specify your most critical dimensions in the CAD model, and we will generate a custom inspection plan. Learn about our quality systems →
📏 Hexagon CMM performing automated dimensional inspection on a machined aerospace bracket.

Real-World CNC Machining Success

See how Konlida has helped customers across industries solve complex manufacturing challenges. Visit our Case Studies section →

  • Aerospace: 5‑axis machining of turbine housings from Inconel 718 — ±0.005mm tolerance, 2‑week lead time.
  • Medical: Titanium spinal implant prototypes — ISO 13485 certified, fully validated finishing.
  • Semiconductor: High‑purity aluminum chambers with complex internal features — surface finish Ra ≤ 0.8μm.
  • Automotive: Low‑volume production of transmission components — from prototype to 500 units with zero defects.

Explore these and more detailed success stories →