As multi-axis spring machines become an industry trend, demands for higher machining efficiency and spring precision continue to grow. Achieving consistent spring dimensions across varying processing speeds has become the new objective for next-generation spring machine controllers and a key technological battleground in the evolution of spring machinery.

With nearly 20 years of experience in the spring machine industry, FINGER has developed the most reliable and advanced control theories and application expertise. Our solutions enable high-speed 24-axis linkage, high-response probe loop systems (2ms response under 230M impedance), real-time length compensation, and have set a record of producing up to 3,000 springs per minute.

At this pivotal stage of industry development, FINGER has launched a “Spring Machine Revitalization Plan” aimed at addressing core challenges within the industry by offering innovative solutions.

Industry Pain Points

1. Deformation during variable-speed machining, making debugging difficult.

2. Inefficiency and lack of precision in multi-axis machining.

Key Technologies

1. Seamless connection of different motion segments to allow continuous machining based on specified motion axes.

2. Synchronization of axis positions and timing within each motion segment.

3. Speed previewing to minimize vibration caused by acceleration/deceleration while improving machining efficiency.

To tackle these issues, FINGER has developed the NIPC (Not-stop In Position Control) theory, embedded within its dedicated spring machine control system. This enables precise contour control of spring machining programs, ensuring the realization of the above objectives.

Sample Machining Program:

G08;  
G01 Y100. F20000.;  
G01 Y100. X150.;  
G01 Y50.;  
G01 Y200. X300.;  
M99;

Compared with traditional constant-time acceleration/deceleration:

Introducing the Next-Gen “Fast–Accurate–Stable” Spring Machine Controller!

As illustrated in the diagram, spring contours under the NIPC model are interpolated entirely according to the user-defined timing and precision. Particularly in multi-axis control scenarios, the system can automatically preview velocity, acceleration, and contextual speed variations across all axes to manage the spring profile—minimizing velocity fluctuations and stabilizing acceleration.

Additionally, the NIPC control process supports minimum error control, as shown in the following diagram:

Actual Processing with NIPC Model

Actual Processing with Traditional Model

In summary, the NIPC control model produces minimal theoretical errors, particularly at junction points (approaching zero), and these errors remain stable regardless of speed variations, confined within an acceleration-bound range. As evidenced by real-world machining comparisons, NIPC control delivers virtually error-free results in both high- and low-speed operations. In contrast, traditional models result in severe spring deformation and require speed-dependent program adjustments.

Thus, the NIPC model is ideally suited to meet the demands of modern spring machining—enabling high-speed, precision processing while minimizing errors. It is especially advantageous for customers needing low-speed prototyping and high-speed production, aligning perfectly with the future direction of spring machines: multi-axis, high-speed, and high-precision.