In the realm of NC feeders, two main types reign supreme: pneumatic NC feeders, the standard choice, and mechanical NC feeders, the optional alternative. The distinction between them lies in their operational mechanisms and suitability for various applications.

Pneumatic NC Feeders: Versatility and Ease

Pneumatic NC feeders, designated as the standard option, boast widespread usage owing to their utilization of pneumatic solenoid valve relaxation. This feature, while not necessarily superior in performance, demands lower installation prerequisites and accommodates a broader array of applications. From punch presses to shears and hydraulic presses, pneumatic NC feeders prove their versatility.

Mechanical NC Feeders: Precision and Performance

On the other hand, mechanical NC feeders, though optional, offer distinct advantages, particularly in scenarios necessitating short-stroke high-speed feeding and traditional punch press operations. Unlike their pneumatic counterparts, mechanical NC feeders employ a mechanical rod relaxation method. However, this method requires an additional relaxation bracket device, limiting their suitability primarily to punch presses.

Key Differences in Operation

Aside from their relaxation methods, mechanical NC feeders feature unique components such as a material thickness adjustment disc and a relaxation handle. Unlike pneumatic models, these elements necessitate adjustments according to the actual material thickness during operation.

Adjusting Material Thickness on Mechanical NC Feeders

For those transitioning from pneumatic to mechanical NC feeders, understanding how to adjust material thickness becomes crucial. Here’s a step-by-step guide:

  1. Lift the Relaxation Handle: Begin by raising the relaxation handle to create space between the upper and lower rollers.
  2. Feed Material Through Rollers: Insert the material head through the rollers and into the punch press, then lower the relaxation handle to secure the material between the rollers.
  3. Adjust Material Thickness: Loosen the fixing screws of the material thickness adjustment disc and modify the handle position based on the actual material thickness. Aim for a 5mm gap between the adjusted relaxation bracket, ensuring accurate feeding.
  4. Secure Adjustments: Once the desired thickness is achieved, tighten the fixing screws of the adjustment disc to secure the settings.
  5. Ensure Accuracy: Remember to readjust the material thickness whenever there’s a change in material thickness to maintain feeding precision.


Understanding the nuances between pneumatic and mechanical NC feeders is essential for optimizing stamping operations. While pneumatic feeders offer versatility, mechanical counterparts excel in precision and performance, particularly in specific applications. By mastering the adjustment process for mechanical NC feeders, stamping business owners can enhance efficiency and accuracy in their production processes.

NC Feeder
NC Feeder