Maijin-China's Premier Provider of Custom High-Tolerance CNC Parts for Global High-Tech Industries.
Simple Definition
Core Characteristics
Precision up to Micron Level: Dimensional accuracy is typically within ±0.005mm, making it suitable for precision parts.
Flexible Production: Changing the part design generally only requires modifying the program, allowing for quick adaptation to small-batch, multi-variety production.
Basic Working Principle
The fundamental principle involves a rotating workpiece and a stationary cutting tool. The CNC system translates a digital design into instructions (G-code) that control the movements of the tool along various axes to precisely remove material from the rotating workpiece. The basic workflow can be broken down into four key stages.
1. Programming: Creating a CNC program (G-code) from a part design that defines the toolpath, spindle speed, feed rate, and other parameters.
2. Workpiece Setup: The raw material (which can be round, square, or hexagonal ) is securely clamped in the machine's chuck or collet.
3. Machining Process: The machine executes the program. The main spindle rotates the workpiece, and the cutting tool moves according to the programmed path to shape the part. This often involves:
Roughing: Quickly removing excess material .
Finishing: Achieving the final dimensions and surface finish.
4. Completion: The finished part is removed. Additional steps like deburring or applying surface treatments may follow before final inspection.
Key Technologies Enabling High Precision
Live Tooling: Allows the integration of milling, drilling, and slotting operations while the workpiece is stationary, enabling the creation of complex features in a single setup.
Multi-Axis Control: Advanced turning centers can control multiple axes (e.g., C-axis) simultaneously, allowing for the machining of complex geometries.
| Aspect | CNC Turning | CNC Milling |
| Core Motion | Workpiece rotates; tool moves along linear axes | Cutting tool rotates; workpiece moves on a table |
| Primary Strength | Manufacturing axisymmetric/rotationally symmetrical parts | Manufacturing asymmetric/prismatic parts |
| Typical Parts | Shafts, bushings, gear blanks, flanges, bolts | Housings, brackets, molds, plate-like parts, complex geometries |
| Key Advantage | Highly efficient and cost-effective for rotational parts | Unmatched geometric flexibility for creating complex features |
Technology | Method | Analysis |
CNC Turning | The Part Rotates, the Tool Cuts | Similar to a potter's wheel, the raw material (workpiece) is clamped in a chuck and rotates at high speed. A stationary cutting tool moves along the rotating workpiece, removing material to create cylindrical, conical, or other shapes symmetrical around a central axis. |
CNC Milling | The Tool Rotates, the Part Moves | More like a sculptor at work. The rotating multi-point cutter (end mill) is the "chisel," while the workpiece is secured to a table. The tool moves in multiple directions (X, Y, Z axes) to shape the stationary workpiece, creating flat surfaces, slots, pockets, and complex 3D contours. |
| Category | Specifications |
| Core Equipment | - CNC Lathes: Multiple precision CNC lathes (Brands: Tsugami, Fanuc, SYMC)- Mill-Turn Centers: Multi-axis machines with live tooling and C-axis |
| Maximum Part Dimensions | - Max. Turning Diameter: Ø 300 mm- Max. Turning Length: 500 mm |
| Standard Tolerance Range | - Standard Machining: ±0.01 mm- High-Precision Machining: Up to ±0.005 mm |
| Typical Surface Roughness (Ra) | - Standard Turning: Ra 1.6 μm- Precision/Fine Turning: Up to Ra 0.8 μm or better |
| Supported Materials | Metals: Aluminum, Stainless Steel, Carbon Steel, Brass, Copper, Titanium Alloys, etc.Plastics: PEEK, Delrin, Nylon, PTFE, Polycarbonate, etc. |
| Available Surface Finishes | Anodizing (Clear, Black, Colors)Plating (Nickel, Chrome, Zinc)Electroless Nickel Plating (ENP)Bead Blasting/BrushingPassivationRoHS Compliance certification available |
Metals Comparison Table
| Material Grade | Cost Level | Tensile Strength | Hardness | Max Service Temp | Key Properties & Applications |
|---|---|---|---|---|---|
| Aluminum 6061 | Low | Medium (125-310 MPa) | Medium (HB 95) | 175°C | Good strength-to-weight, excellent machinability, general parts |
| Aluminum 7075 | Medium | Very High (220-570 MPa) | High (HB 150) | 175°C | Aerospace-grade strength, lower corrosion resistance |
| Stainless 304 | Medium | High (505 MPa) | Medium (HB 70) | 815°C | Excellent corrosion resistance, food/medical applications |
| Stainless 316 | High | High (515 MPa) | Medium (HB 80) | 815°C | Superior corrosion/acid resistance, marine/chemical uses |
| Mild Steel 1018 | Low | Medium (440 MPa) | Medium (HB 71) | 425°C | Good weldability, general structural components |
| Alloy Steel 4140 | Medium | High (655 MPa) | High (HB 197) | 425°C | High strength/toughness, shafts/gears/machine parts |
| Brass C36000 | Medium | Low (340 MPa) | Low (HB 65) | 200°C | Excellent machinability, decorative/electrical components |
| Titanium Ti-6Al-4V | Very High | Very High (895-930 MPa) | High (HB 36) | 430°C | Highest strength-to-weight ratio, aerospace/medical implants |
| Material Type | Cost Level | Tensile Strength | Hardness | Max Service Temp | Key Properties & Applications |
|---|---|---|---|---|---|
| Delrin (POM) | Low | Medium (70 MPa) | High (Rockwell M80) | 90°C | Low friction, high stiffness, gears/bushings |
| Nylon 6/6 (PA66) | Low | Medium (80 MPa) | Medium (Rockwell R120) | 90°C | Good toughness/wear resistance, industrial components |
| PEEK | Very High | High (100 MPa) | High (Rockwell M99) | 250°C | Excellent chemical/thermal resistance, aerospace/medical |
| PTFE (Teflon) | High | Low (30 MPa) | Low (Shore D55) | 260°C | Best chemical/heat resistance, non-stick, seals/gaskets |
| Polycarbonate | Medium | Medium (70 MPa) | Medium (Rockwell M70) | 120°C | High impact strength, transparent applications |
Component Expertise: Our experience includes high-pressure fuel injection components, precision sensor housings requiring EMI shielding, and high-load transmission shafts for automotive applications.
Quality Framework: Our ISO 9001 certified system incorporates SPC statistical process control, comprehensive inspection documentation, and PPAP production part approval processes familiar to German automotive suppliers.
Critical Components: Our capabilities include aircraft hydraulic system components, surgical instrument assemblies requiring biocompatible finishes, and complex medical device enclosures.
Heavy-Duty Applications: Our expertise includes large-scale valve bodies for oil and gas applications, wear-resistant components for mining equipment, and corrosion-resistant parts for hydroelectric facilities.
Technical Capabilities: We employ advanced techniques including stress-relieving treatments, specialized coating applications, and finite element analysis support for structural optimization of heavy components.
FAQ of CNC Turning
Unmatched Supply Chain Speed: Direct access to the world's leading manufacturing ecosystem for faster turnaround.
Proven Technical Expertise: Extensive experience in precision machining for global industries.
This includes production and express shipping. Time varies based on:
Part complexity and quantity
Material availability
Surface finish requirements
Pre-production Verification: First-article inspection (FAI) using CAD models and drawings.
In-process Checks: Real-time monitoring with precision instruments (calipers, CMM) during machining.
Final Inspection: 100% quality check of critical dimensions, surface finish, and material certs.
Full Documentation: Provide inspection reports (incl. CMM data) and material certifications with shipments.
Result: Consistent, certified parts that meet international standards, with complete traceability.
3D Models: STEP, IGES, SLDPRT (preferred)
2D Drawings: PDF, DWG, DXF (with critical dimensions & tolerances)
For best results: Please include both a 3D model and a detailed 2D drawing.
Key factors enabling this precision:
High-end CNC lathes with rigid construction and thermal stability
Precision tooling and expert machining parameter optimization
Controlled environment (temperature, vibration)
In-process metrology using advanced CMM and optical measuring systems
Plastics: PEEK, Delrin, Nylon, PTFE, Polycarbonate
Request a Quote for Your Project
The first thing we do is meeting with our clients and talk through their goals on a future project.
During this meeting, feel free to communicate your ideas and ask lots of questions.
We have achieved the stable sales record at the forefront of our industry in providing high quality products and services to our customers.
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Contact Details
Tel / Whatsapp: +8613632562601
Email: mj@chinamaijin.com
Add: 10F, 9 Building Block B, Bao Neng Science and Technology Park, NO.1 Qing Xiang Rd, Long Hua District, Shen Zhen City, China.