CNC Polishing + Prototype Machining Precision Finishing & Rapid Prototyping for OEM Projects

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Procurement engineers, mechanical designers, and OEM buyers — when you search for "polishing" or "prototype machining", you need a reliable partner who delivers high-quality surface finishing and fast, accurate prototypes under one roof. With 12+ years of CNC precision machining experience, we specialize in CNC polishing (mirror finish, electropolishing, mechanical polishing) and complement it with rapid prototype machining to accelerate your product development cycle.

💡 One-stop advantage: From prototype to polished final part — all in-house. Reduce lead time by up to 40%, eliminate miscommunication, and test with real surface conditions before mass production.

✨ CNC Polishing: Our Core Surface Finishing Service

We operate 28 high-performance CNC polishing machines capable of processing aluminum, stainless steel, carbon steel, brass, copper, titanium, and engineering plastics. Achievable surface finishes as smooth as Ra 0.02μm (mirror finish) or custom requirements.

🎯 Polishing Techniques

  • Mechanical polishing
  • Chemical polishing
  • Electropolishing (corrosion-resistant)
  • Vibratory finishing for complex geometries

⚡ Scalability & Speed

  • Small batch (50 pcs): 3–6 days
  • Bulk order (50,000+ pcs): 10–20 days
  • Rush options available
  • 0% defect rate on recent medical project

🔧 Prototype Machining: Fast, Precise Design Validation

Our prototype machining service (CNC milling, turning, laser cutting) delivers 1–100 units with tolerances as tight as ±0.005mm. We work directly from your CAD files (STEP, IGES, PDF) and offer seamless integration with our polishing line — so your prototypes mirror the final product's surface quality and functionality.

Real impact: A robotics client needed a gear housing prototype + polished finish. We delivered in 3 days, allowing them to complete testing 2 weeks ahead of schedule and move to production faster.

🔄 Polishing vs. Prototype Machining: How They Accelerate Your Project

Process Primary Purpose Key Benefit Typical Output
✨ CNC Polishing Surface finish enhancement, corrosion resistance, aesthetics Ra 0.02μm mirror, consistent batch finish Ready-to-assemble polished parts
🔧 Prototype Machining Design verification, fit & function testing Lead time 3–5 days, ±0.005mm tolerance Functional prototypes (can be polished)

Combining both services under one roof ensures your prototypes are tested with the exact surface finish of final production parts — eliminating surprises and reducing design iterations.

📌 Case Study: Medical Device Client – Mirror Finish & Biocompatibility

🏭 Requirement: Stainless steel prototype and bulk components with mirror finish Ra 0.05μm, strict biocompatibility (ISO 13485).
⚙️ Challenge: Previous supplier delivered inconsistent finishes and high defect rate (~5%).
✅ Our solution: Optimized electropolishing process, in-process surface checks, and full traceability.
📊 Results: Prototypes in 4 days, bulk order in 14 days, 0% defect rate. Client now relies on us for all polishing and prototyping needs.

🏆 Why Global OEMs Choose Us – LEGEND Commitment

🎯 12+ Years
📦 110,000+ Parts
🌍 38+ Countries
✅ 98.8% On-Time Delivery
  • Experience & Expertise: 17 certified machinists, 4 senior finishing engineers.
  • Authoritativeness: ISO 9001:2015, IATF 16949, AS9100D, ISO 13485. Full in-house CMM, surface roughness testers, vision inspection.
  • Trustworthiness: 100% quality guarantee – free rework or replacement. Real-time order tracking and photos upon request. 96% customer retention rate.

📏 Technical Capability Table: Polishing + Prototype Machining

Material Achievable Surface Finish (Ra) Prototype Tolerance Typical Lead Time (Prototype)
Stainless steel 304/316 Ra 0.02 – 0.2μm ±0.005mm 3–5 days
Aluminum 6061/7075 Ra 0.05 – 0.4μm ±0.01mm 3–5 days
Titanium Grade 5 Ra 0.1 – 0.4μm (electropolish) ±0.008mm 5–7 days
Brass / Copper Ra 0.05 – 0.2μm ±0.01mm 3–5 days
Engineering plastics Ra 0.2 – 0.8μm (mechanical polish) ±0.02mm 3–5 days

* Electropolishing available for stainless steel and titanium to enhance corrosion resistance and remove burrs.

❓ Frequently Asked Questions

🔹 Does polishing change part dimensions?
Yes, material removal is typically 0.005–0.02mm depending on the process. We account for polishing allowance in the machining stage to ensure final dimensions meet your drawing.
🔹 Can you polish complex geometries (internal holes, deep cavities)?
Absolutely. We use vibratory finishing, electropolishing, and specialized tooling for internal and hard-to-reach surfaces.
🔹 What is the minimum order for prototype machining?
One piece minimum. We welcome single prototypes for validation before mass production.
🔹 Do you provide surface roughness measurement reports?
Yes, each batch includes surface roughness (Ra/Rz) reports from our in-house tester, plus CMM dimension reports on request.

🚀 Get Your Free Polishing & Prototyping Quote

Send your CAD drawing (STEP, IGES, PDF) to finishing@cncpolish.com or use the form below

Engineering review within 24h | Free sample testing available

🎯 Ready to accelerate your project? Stop juggling multiple vendors. Get polished prototypes and production parts from a single source. Email: info@legend-mfg.com or call +86-189-2451-7393.

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