Precision CNC Machining Service | Custom CNC Milling & Turning Parts

홈 9 CNC Machining Service

High-precision Custom CNC Machining

High-precision custom CNC machining for Aluminum alloy, Stainless steel, Carbon steel, Brass, copper, Titanium, Engineering plastic, etc. Fast prototype & low-volume mass production.

CNC machining is a subtractive precision manufacturing process for custom metal & plastic parts.
We provide CNC milling, CNC turning, 3/4/5-axis machining services for complex & high-tolerance components.
Support prototype, small batch and OEM mass production, widely used in Aerospace, Automotive, Medical equipment, Industrial automation, Hydraulic & pneumatic components, Communication equipment.

Our CNC Machining Capabilities

Precision Tolerance：±0.01mm – ±0.005mm high precision
Machine Types：3-axis, 4-axis, 5-axis CNC milling / CNC turning
Available Materials：Aluminum, stainless steel, carbon steel, brass, copper, POM, ABS
Surface Finish：Anodizing, plating, polishing, sandblasting, heat treatment
Production Range：Rapid prototype, low volume batch, OEM mass production
Supported Files：STEP, IGES, STL, DWG, DXF

CNC Machining Types

CNC Milling：For complex cavities, panels, housings, irregular structures
CNC Turning：For shafts, bolts, sleeves, threaded tubular parts
5-Axis CNC Machining：For ultra-complex curved & aerospace parts
Precision Drilling & Tapping：High-precision hole processing

CNC vs Casting / Die Casting

We also provide secondary CNC machining for cast & forged blanks, to achieve final high-precision assembly tolerance.

CNC 가공

Best for: High precision, prototype, complex surface, small batch

Tolerance: ±0.005mm~±0.01mm

MOQ: 1 pcs

투자 캐스팅

Best for: Complex metal parts, medium batch, low cost

Tolerance: ±0.1mm

MOQ: 50 pcs+

다이 캐스팅

Best for: Large volume aluminum/zinc alloy housing

Tolerance: ±0.1~0.2mm

MOQ: 500 pcs+

CNC Machining Process Flow（Standard Working Procedure）



Step 1: Drawing & DFM Evaluation

Our professional engineers analyze your CAD files, technical parameters, tolerance requirements and material characteristics. We provide free DFM feedback to optimize part structure, reduce production costs and avoid processing risks before manufacturing.



Step 2: CNC Programming & Simulation

Professional programmers write precise machining programs for 3/4/5-axis machines. All processing paths are simulated in advance to eliminate errors such as over-cutting, collision and tool deviation, ensuring processing accuracy and safety.



Step 3: Raw Material Preparation

Select qualified raw materials (aluminum, steel, plastic, etc.) according to part requirements, cut and pre-process the material blanks to match the machining size, reserving reasonable processing allowance for fine machining.



Step 4: Rough Machining

Remove most redundant materials through high-speed rough cutting, quickly shape the basic outline of parts, reserve a small finishing margin, and greatly improve subsequent precision machining efficiency.



Step 5: Finish Machining

Precise cutting with optimized tools and parameters to complete final dimensions, precise holes, threads, curved surfaces and assembly structures. This procedure controls core tolerance within ±0.005mm~±0.01mm to meet high-precision assembly needs.



Step 6: Deburring & Polishing

Remove sharp edges, burrs and tool marks left by machining, perform manual or mechanical polishing to improve part surface smoothness and appearance quality.



Step 7: Surface Treatment

Complete customized surface finishes including anodizing, sandblasting, plating, powder coating, heat treatment and passivation to enhance parts’ corrosion resistance, hardness and aesthetics.



Step 8: Strict Quality Inspection

Inspect part dimensions, tolerance, surface roughness and appearance via calipers, micrometers, coordinate measuring machines (CMM) and other precision equipment. Provide official inspection reports for batch orders.



Step 9: Packaging & Delivery

Adopt anti-collision and moisture-proof professional packaging for precision parts to avoid damage during transportation, and support fast and customized delivery solutions.

Our Advantages

No MOQ, support 1-piece prototype
Strict tolerance control & full inspection report
Fast lead time (3–7 days for prototypes)
Engineer one-on-one technical support
Combine CNC + casting + surface treatment to provide one-stop service

Suijin Casting Principle

Suijin follows a standardized, strict CNC machining manufacturing process from design evaluation to final delivery, ensuring every custom part meets precise tolerance requirements and quality standards.

Know More

자주 묻는 질문

Q1: What is CNC machining?