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JASON  CHEN How Variable Holding Power Is Beneficial For Electromagnetic Chucks
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As electromagnetic chucks can provide variable holding power this is the reason which greatly improves their ability to support a wide range of machining applications.

For holding Ferro-metallic work pieces with a strong, uniform holding force magnetic chuck from Magnet Manufacturer are designed. They constitute accurately centered permanent magnetic face that works in conjunction with an operator actuated permanent or electromagnet. To create a secure anchor for the work piece the work piece closes the magnetic loop.
Magnet Manufacturer
Shop Safety

Over permanent magnetic chucks the variable holding power of electromagnetic chucks give it an advantage. But their selection generally depends both on the machining application and shop safety. Since, to operate Motor arc Magnets need constant power but a power failure can introduce a worker safety concern.

While to address these concerns uninterruptible power supplies, power conditioners and battery backup systems can be integrated into the machining operations but on the design of a particular machining application the ultimate decision relies.
Motor arc Magnets
Electromagnetic Chuck Operation

The constructions of electromagnetic chucks are with electrical coils wound around a steel core embedded in the chuck. A chuck controller from Magnet Factory in China is used to generate a variable DC voltage in the chuck's coils to energize the electromagnetic field. Electromagnetic field of the coil causes particles within the Ferro-metallic work pieces to be aligned in a common direction. 

Between the work piece and the chuck this alignment creates the electromagnetic holding force. As long as voltage is applied the chuck's poles are magnetic. To vary the strength of the magnetic field the operator can adjust the controller's DC voltage, which, in turn, provides the variable holding force.

The Variable Holding Power Advantage

The chuck's ability is improved by the variable holding power to support a wide range of machining applications that include shaping, cutting, milling, EDM, high speed cutting operations and thin work for grinding. For automation purposes electromagnetic chucks can easily be interfaced with machine centers.

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