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What Does CNC Machine Stand For? Understanding CNC and Its Machining Process

What Does CNC Machine Stand For? Understanding CNC and Its Machining Process
What Does CNC Machine Stand For? Understanding CNC and Its Machining Process
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CNC machines, or Computer Numerical Control machines, are manufacturing marvels that integrate accuracy, speed, and regularity based on computerized systems. The machinery is used across different sectors, such as aerospace and automotive, for making intricate components that are of high quality. This piece of writing gives an insight into the basic principles that underlie CNC technology, outlining the operational mechanics and step-by-step cutting process. After reading this article, you will have a good understanding of how CNC machines function and their importance in contemporary manufacturing techniques.

What Is a CNC Machine?

What Is a CNC Machine?

Understanding the Term “CNC”

Computer Numerical Control (CNC) is an acronym for. It refers to a system where computers are used to control the movement and operation of manufacturing machinery, such as lathes, mills, and routers. By inputting precise instructions via computer code; CNC machines can perform complex tasks with high accuracy, repeatability and automatically guide machine tools through various machining processes. This eliminates the need for manual intervention significantly reducing potential for human error and enhancing production efficiency.

How CNC Machines Differ From Traditional Machines

Traditional machines solely depend on manual control, which necessitates skilled machinists to operate cutting tools, feed rate, and positioning. This procedure requires a lot of human labor, forcing the machinist to take a lot of risks that favor the accuracy and quality of the end product. On the contrary, CNC machines allow computer systems to control the machining process. Some major differences are: Precision in CNC machining technology is essential for accurate machine parts production.

Automation and ControlManual operation is how traditional machines function while CNC machines use computer numerical controlled programming which results in less dependence on manpower.

Repeatability: With CNC machines, repeatability is a significant advantage. The same component can be produced numerous times with identical specifications, which is challenging to achieve with manual operations.

Efficiency:CNC machines improve efficiency significantly by reducing setup time and minimizing the potential for human error. As such, this leads to more rapid rates of production and enhanced workflow system.

Complexity: CNC machines can execute complex geometrical cuts and multi-axis movements that are hard or sometimes impossible with their traditional counterparts.

Technical Parameters:

  • Accuracy: Generally, CNC machines have an accuracy of up to ±0.0001 inches (±0.0025 mm).
  • Cutting Speed:CNC machines are able to achieve high cutting speeds in excess of 4000 SFM.
  • Control System:CNC machine tool controls use G-Code &/or M-Code for programming, thus offering versatile control over all aspects of the machining process.

These distinctions make CNC machines indispensable in modern manufacturing environments where precision, efficiency, and repeatability are paramount.

Advantages of Using CNC Machines

The number of advantages that CNC machines possess is what makes them indispensable in contemporary manufacturing.

CNC machining technology has better precision and accuracy:

  • CNC machines guarantee the highest level of accuracy with tolerances to ±0.0001 inches, which are required for predictable production of high-quality parts.

Increased efficiency and productivity:

  • CNC machines considerably shorten preparation time and labor costs and eliminate human error, thus leading to quicker manufacturing processes and higher throughput.

High repeatability levels:

  • Upon programming, one part can be produced several times over with respect to its specifications thereby eliminating variations from part-to-part and reducing waste.

Ability to handle complex tasks:

  • Complex parts that would be hard or impossible to produce using manual machining are easily made by CNC machines because they can handle intricate geometric cuts as well as multi-axis movements without a hassle.

Flexibility:

  • CNC machines easily work on different materials like metals, plastics, and composites, among many others, and perform diverse operations such as drilling, milling, and turning.

It is valued for enhanced safety when it comes to CNC machining technology:

  • Automation makes any human contact with the machinery unnecessary enhancing safety in the workplace while minimizing accidents occurrence.

In terms of scalability:

  • Scalability is easy with CNC machining. Once a design has been programmed into the software it can be repeated indefinitely making it suitable for small scale as well as larger runs.

These features demonstrate why CNC machines have become crucial components in modern manufacturing, significantly improving precision, efficiency, and general process reliability.

What Types of CNC Machines Are Available?

What Types of CNC Machines Are Available?

Overview of Different Types of CNC Machines

Considering the fact that there is a wide selection of different types of CNC machines each tailored to specific industrial applications and tasks, let’s take a look at some of the most common ones:

CNC Milling Machines:

These use rotary cutters to extract materials from workpieces, which can perform different kinds of cuts and shapes. The milling machines are ideal for manufacturing complicated parts with high accuracy.

CNC Lathes:

CNC lathes involve rotation of the workpiece around its axis in order to facilitate various cutting or shaping operations. They are excellent for producing cylindrical parts and obtaining nice finishes.

CNC Routers:

These machines are majorly used for cutting and shaping wood, plastic, as well as soft metals and can be very complex creating intricate patterns and designs quickly.

CNC Plasma Cutters:

These use plasma torches to cut through steel and aluminum-like conductive materials. High-speed precision cutting makes it suitable for large metal fabrication.

CNC Laser Cutters:

These employ high-powered laser beam to make extremely precise cuts in a range of different materials including metals, plastics or woods. These are used where delicate detail is needed as well as high quality finish.

CNC Electrical Discharge Machines (EDM):

EDM machines utilize electrical sparks that erode material from a work piece. Complex geometrical shapes, hard materials machining, intricate cavities etc. are done using them.

Each type has unique features that differ depending on the specific needs of industry ranging from flexibility to accuracy thereby making it possible for them to be used across several industries.

Exploring CNC Mills and Lathes

It is significant to know the unique functions and technical aspects that affect their output while discussing CNC mills and lathes. Complex geometric tasks are carried out by CNC mills, but CNC lathes are specially designed with high precision for producing cylindrical parts.

CNC Mills

  • CNC machine tools depend on the speed of their spindle: Up to 20,000 RPM (depending on the machine model).
  • Axis Movements: General 3-5 axes.
  • Cutting Tools:There are several types of rotary cutters used in both lathe machines and other CNC machine tools.
  • Precision: Tolerances can be as small as 0.001 mm.
  • Applications: Perfect for complex part creation, mold making and tooling.

CNC Lathes

  • Spindle Speed:Up to 6,000 RPM (depending on the machine model).
  • Axis Movements:This varies with different types of CNC machines in use i.e., between two and four axis.
  • Workpiece Rotations: Continuous revolving through a full circle (360°).
  • Precision: Tolerances up to 0.01 mm may be achieved.
  • Applications: It specializes in turning operations where it makes shafts, bushings, and threads.

When a manufacturer understands these parameters, they can make a choice of machinery that will match their specific production demands, hence leading to efficient work processes efficiently done with accuracy.

The Role of CNC Routers in Manufacturing

CNC routers form a very important part of modern manufacturing since they offer high-speed, flexible, and automated solutions for cutting and forming different substances. This is in contrast with CNC mills and lathes that are specifically designed to deal with a broad range of non-metallic materials such as wood, composites, plastics and foams. They have high-speed spindles capable of 24,000 RPM or more and work on multiple axes—usually three, although some more advanced models can offer four or even five axes.

The main characteristics include:

  • Material adaptability: Can process wood, plastic, foam, and softer metals.
  • High speed processing: Spindle speeds up to 24,000 RPM.
  • Complicated cuts: Allows complex cuts and designs that can be repeated every time.
  • Automation: Increases manufacturing speed while minimizing manual involvement.
  • Precision: Tolerances as low as 0.01mm, leading to uniform quality.

The use of CNC routers covers many industries from woodworking through sign making to furniture production to aerospace prototyping even down to automotive component manufacturing. This enables the process of manufacturing to be cost effective and scalable through reducing production period significantly whilst increasing accuracy attributed by CNC routers.

How Does CNC Machining Work?

How Does CNC Machining Work?

The CNC Machining Process Explained

The CNC machining process has a number of critical steps aimed at converting digital designs into precise physical objects:

  1. Design Creation:This starts with detailed digital modeling using CAD (Computer-Aided Design), which is essential for CNC manufacturing. This model stipulates all the dimensions, shapes and features of the final item.
  2. Conversion to CNC Program: The CAM system, on the other hand, imports this CAD model where it then uses it to generate the G-codes that are understood by the CNC machines. These codes contain specific information about how to move from one point to another with a particular speed and path of tools.
  3. Machine Setup: Appropriate tools and materials are selected and loaded into the machine. In order to secure stability during machining, the workpiece must be clamped securely.
  4. Machining Execution is meticulously carried out using advanced CNC machine tools: The cutting, drilling, milling or turning operations among others are undertaken step-by-step following direction given in G-Codes as provided by G-Code language . With its high precision and automated controls, this equipment ensures that every part produced adheres strictly to all specifications.
  5. Quality Inspection in CNC machining technology ensures every component meets stringent standards: Upon completion of these parts they are examined for whether they adhere to the drawing requirements. Modern advanced CMCs normally have in-process measurement systems used for real-time checks during machining processes.
  6. Post-Processing is a crucial step in cnc manufacturing to ensure the final product meets all specifications: This involves additional operations like deburring, surface treatment or heat treatment depending on what properties are desired after processing for any application of a part..

The procedure provides an environment that is highly corrosion resistant, hence guaranteeing high repeatability and precision making CNC machining an indispensable technique in modern manufacturing especially when it comes to machine parts.

Steps Involved in CNC Programming

Part Design: To start, create an elaborate digital model by use of CAD (Computer-Aided Design) software. That is the model that defines all dimensions, shapes and features of the final product.

  • Parameters: Dimensions, tolerances and material specifications.

Conversion to CNC Program: The CAD model is then imported into CAM (Computer-Aided Manufacturing) software which produces G-code—a language that can be understood by CNC machines. It gives specific instructions on movements or path feeds, speeds or spindle speeds as well as paths to be taken by a tool in CNC machine tools.

  • Parameters: Feed rate, spindle speed, tool path coordinates, and cut depth.

Machine Setup: Appropriate cutting tools and materials are chosen before being loaded into the CNC machine. During the machining process, the workpiece must be clamped in order to ensure its stability of it.

  • Parameters: Tool selection (e.g., end mill – drill bit), material type, and clamping force.

Machining Execution: Cutting, drilling, milling or turning are some of the operations carried out by a CNC machine under the guidance of G-codes. Production of parts with this machine ensures accuracy since its systems have very high precision.

  • Parameters: Machine axis movements, cutting speed, coolant flow rate if applied, for example, during the drilling operation.

Quality Inspection: A finished part has to go through inspection so as to check its conformity against design references. Advanced models also have real-time inspection capabilities, which are made possible using in-situ measurement tools.

  • Parameters: Measurement tolerances; inspection criteria e.g., dimensional accuracies as well as surface finishes.

Post-Processing: Depending on what one wants for his final properties some additional steps like deburring, surface finishing or heat treatment might be required in order to accomplish that purpose.

  • Parameters: Surface roughness; heat treatment temperature; deburring intensity.

This systematic procedure helps achieve high repeatability, hence making CNC programming an essential aspect of modern-day manufacturing.

Materials Used in CNC Machining

CNC machining is compatible with an extensive array of materials which are selected on the basis of specific considerations for the final product. Common categories include:

Metals: This category frequently comes into play in the implementation of CNC machining owing to metals’ strength, endurance and adaptability. Popular choices are as follows:

  • Aluminum: Utilized in aerospace, automotive and consumer electronics, aluminium is preferred for its machinability, lightness and resistance to corrosion.
  • Steel: Different types of steel including carbon steel and stainless steel can be found in applications where there is a need for high strength and abrasion resistance.
  • Titanium: A good combination of lightweight construction coupled with excellent mechanical properties makes it suitable for aerospace applications as well as medical devices.

Plastics: Plastics are chosen because they have low weight and they can be easily machined. These commonly include:

  • ABS (Acrylonitrile Butadiene Styrene): ABS being tough with impact resistance property is mostly used in prototypes and enclosures.
  • Polycarbonate: Polycarbonates with high strength come in handy especially when utilized in optical protective systems.
  • Nylon: This polymer has got good durability and versatility thus widely applied as gears, bearings or bushings.

Composites: Composite materials are engineered to combine the properties of various substances hence enhanced performance characteristics.

  • Carbon Fiber Reinforced Polymers (CFRP): CFRP has been designed in such a way that it exhibits high strength combined with lightweight which serves critical components for aviation industry such as aerospace structures or control surfaces etc also sports equipment like bicycles, tennis rackets etc..
  • Glass-Filled Nylon: Glass-filled nylon, also called GFN, offers better stiffness along with thermal stability, making it ideal for industries that require more performance from plastics than usual ones do.

By selecting the most appropriate material, CNC machining can meet different industries’ varied needs thereby enhancing their efficiency and productivity.

What Are the Applications of CNC Machines in the Manufacturing Industry?

What Are the Applications of CNC Machines in the Manufacturing Industry?

CNC Machines in Various Manufacturing Methods

The importance of CNC machines in several manufacturing processes is as a result of their accuracy and flexibility. In subtractive manufacturing, the use of CNC machining entails cutting and removing material from a solid block into components with high precision. The additive manufacturing process uses CNC machines for layer-wise addition of materials to create parts such as those typically used in 3D printing. It is advantageous to use CNC machines in injection molding because they help create precise molds that are used for the production of plastic parts while facilitating multiple intricate cuts and patterns through the employment of tools like CNC laser cutters and plasma cutters, especially when it comes to sheet metal fabrication. All these methods demonstrate how widely applicable Computer Numerical Control (CNC) machining has become in modern production, thereby improving efficiency and uniformity across different outputs necessary for various productions.

Impact of CNC Technology on the Manufacturing Industry

CNC technology revolutionized the manufacturing industry with increased precision, efficiency, and scalability. One significant benefit of CNC machines is their ability to create complex and detailed parts with great accuracy, often in tolerances within micrometers. With this type of accuracy, there is less waste material produced and hence minimal rework or touch-up required thus reducing production costs.

Also, CNC Technology provides for repetitive high rates for mass-produced components to be made uniform. This importance is especially evident in industries like aerospace and automotive, which require consistency in quality. Moreover, CNC machines facilitate fast prototyping, enabling quicker design iterations and time-to-market.

While optimizing the CNC operations, technical parameters play an important part. Main parameters include:

  • Spindle Speed: It generally ranges from 500 RPM to 50,000 RPM influencing the surface finish along with material removal rate.
  • Feed Rate: It determines how fast the cutting tool moves forward, usually expressed in inch per minute (IPM) or millimeters per minute (MM/min).
  • Tool Wear Monitoring: By means of sensors that detect tool wear and tear these should be replaced during machining so as not to compromise on precision.
  • Axis Resolution: It is responsible for fine movements of the machine’s axes somewhere around the submicron level, which determines how accurate its final product will be.
  • Cutting Speed: It depends on the materials being processed, meaning it influences temperature and stress on both the workpiece and its tooling systems.

The standardization of manufacturing processes through the integration of CNC technology leads to improved product quality, shorter lead times and increased flexibility in production. This advancement continues to cause higher efficiency levels throughout the manufacturing sector.

Examples of Products Produced by CNC Machines

In different industries, CNC machines are important in the production of a wide range of products. Here are a few examples:

  • Automotive Components: Engine blocks, gears, and transmission shafts are some of the intricate parts made using CNC machines that ensures high reliability and precision.
  • Aerospace Parts: Turbine blades, airframe components and engine parts which are critical are fabricated with precise using computer numerical control technology that meets stringent industry standards.
  • Medical Devices: In the medicine sector, for instance, complex medical devices such as implants, prosthetics, and surgical instruments that require high levels of hygiene and precision can be produced through CNC machining.
  • Electronic Enclosures: These customized electronic enclosures and housing units for industrial appliances have been made to exact specifications so as to protect their internal components.
  • Industrial Equipment: CNC machines used for building custom fittings, hydraulic components, and power generation parts, among other various industrial machinery parts.
  • Consumer Goods: CNC machining allows precise manufacturing of everyday items like kitchen utensils, home appliances, and sports goods.

These instances exemplify how versatile yet important these machines are in coming up with highly qualitative, reliable, and complex products in many sectors.

What Is the History and Evolution of CNC Technology?

What Is the History and Evolution of CNC Technology?

The Origin and Development of CNC Machines

Computer Numerical Control (CNC) machines emerged from the work of John T. Parsons and his group at MIT, who first developed a numerical control system for milling machines back in the late 1940s and early 1950s as a response to the demand for more accurate production processes of complex helicopter blades by the United States Air Force. The original CNC systems relied on punched cards to store coded information about how the machine itself should move. The advent of computers in this field during the 1960s and 1970s saw these basic numerically controlled systems metamorphose into what is today known as CNC systems with the integration of computer programming languages like G-code. By introducing digital computers, manufacturing processes became less rigid, precise, and automatic. Nowadays, CNC technology still remains one of the pillars in modern manufacturing that has been evolving through software improvement and sensor enhancement with the introduction of machine learning, hence improving efficiency as well as accuracy within production settings.

How CNC Technology Has Revolutionized the Manufacturing Industry

CNC technology, through the improvement of precision, efficiency, and scalability in production processes, has changed the manufacturing industry fundamentally. Machining accuracy is one of them, and it has been made better by having absolute control over cutting tools via G-code programming that guarantees highly accurate operations. For example, there are technical parameters such as positioning accuracy, which is typically within ± 0.001 inches, and repeatability, usually within ± 0.0005 inches, thus showing how precise CNC machines are.

Automation capabilities of CNC technology are a significant contributor to reduced production lead times. Using advanced toolpath optimization and high spindle speeds (often above 10,000 RPM), CNC machines can carry out complex tasks much faster than traditional manual methods. Another way to enhance efficiency includes the incorporation of real-time sensors and feedback systems, making adaptive corrections possible so that downtime can be minimized.

This makes CNC machine advantageous in terms of scalability because they can easily switch between different product designs by changing software instructions which makes them suitable for both large-scale manufacturing runs or custom manufacturing. Decreased levels of human error coupled with constant quality output are also responsible for reducing scrap rates while raising overall product quality.

The continuous development of CNC technology that includes artificial intelligence and machine learning integration sustains the position of manufacturing industry in innovation front driving enhanced productivity and precision in the production process forever more.

The Future of CNC Machining

Emerging technologies are set to propel CNC machining into the future. Artificial intelligence (AI) and machine learning (ML) are predicted by leading sources to be integrated into CNC workflows, thus making it possible for predictive maintenance, optimized tool paths, and less machine downtime. The result is an unprecedented level of connectivity and data exchange via smart factories with IoT-enabled CNC machines that leads to superior efficiency and productivity. In addition, advances in material science will enable CNC machines to operate on new-age composites as well as exotic alloys, thus expanding their scope of application. Hybrid CNC machines that combine additive and subtractive processes will increasingly allow for more flexible designs, enabling innovation to flourish due to advancements in additive manufacturing techniques. This coming together of these technologies shall, therefore, lead to improved precision, automation, and adaptability within the future of CNC machining.

How to Become a CNC Machinist?

How to Become a CNC Machinist?

Skills and Training Required for CNC Machinists

Becoming a CNC machinist demands technical skills, formal education, and hands-on training. The core competencies include being well-grounded in machining processes, the ability to read blueprints and technical drawings fluently, as well as knowledge in computer-aided design (CAD) and computer-aided manufacturing (CAM) software. Generally, prospective CNC machinists have a high school diploma or GED, underpinned by either specialized technical training programs or associate degrees in precision machining technology. Practical experience matters the most, and it can be achieved through apprenticeship or internship programs that expose trainees to real-world machining environments. Moreover, continued professional development and certification such as those provided by National Institute for Metalworking Skills (NIMS) can enhance job prospects and expertise levels in this field.

Career Opportunities and Job Roles in CNC Machining

The CNC machining sector is ripe with a broad array of career prospects for competent CNC professionals. Such jobs in the industry can be found in different sectors such as aerospace, automotive, medical device manufacturing, and electronics. Jobs within this field include:

  • CNC Operator: responsible for setting up CNC machines, operating them to make sure parts meet specified standards, routine maintenance. Technical parameters: machine operation time, precision tolerance levels and production output rates.
  • CNC Programmer: develops and optimizes CNC programs through CAD/CAM software into precise manufacturing instructions. Technical parameters: programming accuracy, toolpath optimization and cycle time reduction.
  • Quality Control Inspector: Inspects and measures manufactured parts using tools such as calipers and micrometers to ensure they adhere to strict quality standards. Technical parameters: dimensional accuracy, surface finish specifications and defect rate analysis.
  • CNC Maintenance Technician: repairs, troubleshoots, and performs preventative maintenance on CNC machines in order to minimize downtime and guarantee effective operations. Technical parameters: machine uptime percentage, mean time between failures (MTBF), and maintenance response time.
  • Production Supervisor: supervises all activities of the department that involve running of CNC machinery; manages employees; ensures high-quality products are being produced on time. Technical parameters: Production throughput, Workforce productivity, Adherence to safety standards.

In addition to these positions, skilled machinists may consider other specialized roles including tooling engineers, CAD/CAM engineers or research and development (R&D) specialists which further involves an extensive knowledge about machining principles as well as continual professional development.

The Importance of Continuous Learning in CNC Programming and Operation

Constant learning is crucial in CNC programming and operation because technology advances very quickly and industry requirements change. With the increasing complexity of CNC equipment, machinists and programmers have to remain informed about the latest software updates, machining methods, and advancements in tools to uphold accuracy and effectiveness. Professional training at regular intervals not only aids in keeping pace with competition but also improves on quality output while minimizing production errors. Additionally, getting acquainted with fads and norms prevailing within the industry helps in developing problem-solving skills among individuals as well as enhancing productivity, which is one of the main contributing factors that makes it possible for a company to comply with safety regulations pertaining to its line of operations. In the long run, continuous learning cultivates individual growth while encouraging operational success within CNC machining environments.

Reference sources

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Frequently Asked Questions (FAQs)

Q: What does CNC stand for?

A: The acronym CNC means Computer Numerical Control. It is a way of making things that involve using computers to control how machine tools work.

Q: What is the history of CNC?

A: The development of the first CNC machines happened in the 1940s and 1950s. Electronics and computer technology innovations, over several decades, greatly changed CNC machining.

Q: What kinds of CNC machines are there?

A: Different types of CNC machines include CNC milling machines and others such as computer numerically controlled lathes (CNC lathes) or computer numerically controlled plasma cutters (CNC plasma cutters). Different processing techniques are used by different types of these machines.

Q: How is CNC machine programming done?

A: To program a CNC machine, one must write instructions that control its motion and cutting activities. Communication with the controller typically happens through G-codes, which are abbreviated language understood by them.

Q: What are the advantages of CNC machining?

A: Some benefits derived from engaging in this production process include enhanced precision, consistency, and efficiency. Continuous operation in this technology can be achieved while producing complex shapes that would have been otherwise difficult to achieve using manual methods.

Q: What can be processed by CNC machines?

A: This technology can generally work with many materials, such as metals, plastics, wood, and composites. Depending on the design purpose, it may perform high-precision cutting jobs as well as shaping or drilling tasks.

Q: What is a CNC milling machine?

A:It is an automatic cutter machine tool used to remove material from a piece being worked on. It can perform complicated operations such as hole boring,cutting, and contouring.

Q: What is the role of a cnc machinist

A: A person who sets up and operates cnc machinery while at work. Among other things, they must have reading abilities, code writing and inputting skills, and part quality control expertise. This is a well-trained profession with a strong emphasis on details and technical know-how.

Q: How does CNC machining impact manufacturing?

A: It’s revolutionized manufacturing by fastening the production process, increasing accuracy and enabling consistent and efficient fabrication of complex parts thus reducing labor cost in addition to minimizing material scrap.

Q: How do I start a career as a CNC machinist?

A: Typically, formal training in CNC machining technology such as certificate or associate degree programs that cover the fundamentals of CNC machine programming, operation, and maintenance are prerequisites for becoming a CNC machinist. Practical experience is also crucial, along with job-based instructions.

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LIANG TING
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Greetings, readers! I’m Liang Ting, the author of this blog. Specializing in CNC machining services for twenty years now, I am more than capable of meeting your needs when it comes to machining parts. If you need any help at all, don’t hesitate to get in touch with me. Whatever kind of solutions you’re looking for, I’m confident that we can find them together!

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