China Prototype Machining Supplier & Engineering Products

Critical CNC-milled and turned features can be held to ±0.005 mm (5 microns), with ±0.01 mm routinely maintained across production-grade prismatic geometries. Final achievable tolerance depends on raw material selection (e.g., thermal expansion coefficients in plastics vs. steels), feature size, aspect ratio, and cutting tool reach. All geometric dimensioning and tolerancing (GD&T) metrics are validated during pre-production DFM analysis.

All precision 3, 4, and 5-axis CNC machining, Swiss mill-turning, and progressive sheet metal stamping are conducted within Sunmy's wholly-owned Shenzhen facilities. Large tonnage die casting and high-specialty chemical surface treatments (e.g., hard anodizing Type III, PTFE coating, PVD) are handled through long-term audited partner plants under direct Sunmy engineering supervision. Crucially, 100% of final quality inspection, coordinate measuring machine (CMM) testing, and First Article Inspection (FAI) documentation are performed in-house prior to export packing.

We sign strict Non-Disclosure Agreements (NDAs) prior to receiving STEP, IGES, or DXF files. Sunmy is a direct manufacturer, not a trading middleman; your CAD files are stored on isolated, encrypted internal servers accessible solely by authorized CAM programming engineers. We never outsource your core components to secondary unvetted third parties.

Every shipment includes an in-depth Quality Control Inspection Dossier containing: (1) Certified raw material mill test certificates (spectrometric chemical composition and mechanical tensile properties); (2) Full First Article Inspection (FAI) dimensional report; (3) CMM coordinate data with GD&T mapping; (4) Surface roughness measurement printouts; and (5) RoHS/REACH substance compliance declarations where applicable.

Yes. Our agile production architecture bridges the gap between single-piece R&D proof-of-concept prototypes and mass fabrication. We regularly machine pilot batches of 50 to 5,000 units directly via multi-axis CNC or rapid tooling. Once market fit is confirmed, we scale the exact CAD geometry into die casting, injection molding, or progressive stamping tooling under the same management team.

Our direct engineering team evaluates incoming 3D geometry and prints within 24 hours. This response includes thorough Design for Manufacturability (DFM) feedback—highlighting thin walls, tight radii requiring EDM, non-standard thread depths, and raw material optimization suggestions to minimize machine cycle time and per-part unit cost.