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Three principles of CNC machining technology

2025-09-11

1. The Principle of Maximum Process Concentration and Single-Shot Positioning

In general, when machining parts on CNC machine tools, especially machining centers, processes can be concentrated to the greatest extent possible. This means that the part should complete most or all of the processes that the CNC machine can handle in a single setup. CNC machining tends to favor process concentration, which reduces the number of machine tools and workpiece setups, minimizes unnecessary positioning errors, and improves productivity. For hole systems requiring high coaxiality, the entire coaxial hole system should be machined in a single setup using sequential tool changes before machining other holes. This eliminates the effects of repeated positioning errors and improves the coaxiality of the hole system.

2. The Principle of Roughing First, Finishing Later

In CNC machining, processes should be divided based on factors such as part accuracy, rigidity, and deformation. Separate roughing and finishing operations should be followed. That is, complete roughing first, followed by semi-finishing and finishing. For a given surface, the sequence should be roughing, semi-finishing, and finishing. During roughing, the machine tool and tool performance should be fully utilized, ensuring machining quality, tool durability, and the rigidity of the machine tool-fixture-tool-workpiece system. A maximum number of cuts should be used to achieve a uniform stock clearance before finishing. Finishing primarily focuses on ensuring part accuracy and surface quality, so the final contour of the part should typically be achieved with the final continuous finish cut. To ensure machining quality, a finishing allowance of 0.2-0.6mm is generally recommended. A period of time should be allowed between roughing and finishing to allow the part to fully recover from any deformation after roughing before proceeding to finish, thereby improving machining accuracy.

3. Principle of "Near-end, Far-end" and "Surface-end, Hole-end"

Based on the distance of the workpiece from the reference point, areas closer to the reference point should generally be machined first, and areas farther from the reference point should be machined later. This shortens tool travel and reduces idle time. For turning, the "near-end, far-end" approach also helps maintain the rigidity of the blank or semi-finished product and improves cutting conditions. When machining parts that require both flat milling and boring, the order is to mill the flat surface first and then bore the hole. Because flat milling creates greater cutting forces and can easily cause deformation, milling the surface first and then boring the hole allows the part time to recover. This helps ensure hole machining accuracy. Furthermore, if boring the hole first and then milling the flat surface, burrs and flash will form at the hole mouth, affecting assembly.

Conclusion

Huateng Metal Products (Dongguan) Co., Ltd. has a 25-year history of excellence in CNC machining. We pride ourselves on our commitment to innovation, precision, and customer satisfaction. With 25 years of experience, we have become a leading provider of high-quality CNC machining services across a wide range of industries and applications.

For years, the Huateng Metal Products team has been striving for excellence in CNC machining, constantly exploring technological advancements and industry best practices to achieve exceptional results. Our state-of-the-art facilities, equipped with the latest CNC machine tools, enable us to meet the most demanding requirements with precision and efficiency. Whether designing prototypes, producing custom parts, or mass-producing them, our team is dedicated to delivering exceptional products that meet and exceed our customers' expectations.

At the heart of our success lies our unwavering commitment to customer satisfaction. We work closely with our clients to understand their unique needs and specifications, providing customized solutions that combine cost-effectiveness with superior quality. Our commitment to continuous improvement and innovation enables us to maintain our leadership position and consistently deliver cutting-edge CNC machining services that set the standard in the industry.

Looking back on our 25-year journey, we are grateful for the trust and support of our customers, partners, and employees. Their unwavering confidence in our capabilities has been a significant driver of our progress to where we are today. Looking ahead, we will continue to uphold the values ​​of integrity, excellence, and innovation that have always been the foundation of our success.

In short, this 25-year milestone is a testament to our relentless pursuit of excellence and our passion for pushing the boundaries of CNC machining. We are excited about the future and look forward to continuing to provide exceptional CNC machining solutions to our valued customers. Cheers to 25 years of excellence and many more years of innovation and success to come!