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Precision Grinding 
Solution

  • Electro permanent magnetic design. No electric power supply required to keep the magnetic force, never generate temperatures to affect the accuracy of workpieces, suitable for precision surface grinding jobs. 

Eliminating Stress to Achieve Micron-Level Grinding Precision 

In the field of precision grinding, workpiece clamping is a critical factor that directly affects final tolerances and surface quality. Traditional mechanical fixtures—such as vises or bolt clamping—often create localized stress concentrations, which are a primary cause of workpiece deformation and reduced flatness and parallelism. 

Magnetic Surface Grinder Chuck 

Earth-Chain’s Electro Permanent Magnetic Chuck – EEPG Series  is specifically designed for high-precision grinding environments, offering a non-mechanical clamping solution with uniformly distributed magnetic force. Our solution is engineered to eliminate potential workpiece deformation during grinding, allowing machine tools to fully realize their inherent precision capabilities. 

Technical Challenges in Precision Grinding Processes

1. Clamping Stress and Thermal Deformation Management
For thin-walled, long, or high-precision workpieces, internal stress caused by mechanical clamping can result in micron-level warping once the workpiece is released. In addition, grinding processes are often time-consuming and demand exceptional thermal stability from the workholding system. Conventional electromagnetic chucks require continuous power, generating heat that can cause thermal deformation of the machine, workpiece, and chuck body—directly compromising grinding accuracy.

2. Setup Time and Machine Utilization
Repeated positioning and precise alignment of precision-ground workpieces are extremely time-consuming, significantly increasing non-cutting time. In high-mix, low-volume production environments, complex setups and lengthy clamping procedures severely limit production flexibility and overall machine utilization.

Technical Advantages of the Magnetic Clamping Solution

1. Zero-Stress Clamping for Guaranteed Final Accuracy
Through optimized magnetic circuit design, magnetic flux is evenly distributed across the underside of the workpiece, securing it in a free, unstressed state. This eliminates compressive forces associated with traditional fixtures, making it ideal for ultra-thin workpieces and deformation-sensitive materials. The result is more stable flatness and parallelism—forming the foundation for high-quality precision grinding.

2. EEPG Electro-Permanent Technology and Thermal Stability
The EEPG electro-permanent grinding chuck requires electrical power only during magnetic switching (ON/OFF) for 1–3 seconds. No continuous power is needed during clamping. This key technological advantage prevents heat generation during extended grinding operations, ensuring excellent thermal stability—an essential condition for achieving micron-level grinding accuracy.

3. Rapid Loading/Unloading and CNC Integration
Magnetic activation and release are completed within 1–3 seconds, allowing operators to change workpieces quickly without tools or clamp multiple small parts simultaneously. This significantly improves machine utilization. The EEPG controller can be integrated with CNC systems to enable automated safety monitoring of clamping status, ensuring both operational safety and efficiency.

Let us evaluate the most suitable magnetic clamping solution for your application.
Contact us today to receive professional, application-specific technical recommendations.