SMP brand Electro-permanent magnetic chucks are a hybrid of electromagnetic and permanent magnetic chucks, which allows these units to be larger and more powerful for metalworking applications. The fast action of strong direct current enables the system to take advantage of the ferromagnetic material to become a permanent magnet. In this state, they do not need an external power supply. An electrical current is applied to lock and unlock the chuck, but in the event of a loss of power, the chuck continues to hold the part tightly.

An electro-permanent chuck contains a number of steel poles, each alternating between north and south polarity. The number of poles depends on the size of the chuck. Two magnets are sandwiched between the poles. One pole is an electronically switchable permanent set and the other is a permanent set. The permanent sets are constantly polarized in one direction and the switchable magnets have an electric coil around them so they can be polarized in the north or south direction by passing a current through the coil. When both sets of magnets have the same polarity, full magnetic power is achieved. When both sets have opposite polarity, they cancel each other out and the magnet surface is off.

Application:

·      5-sided machining is possible in one clamp.

·      Energy saving, no electric power supply during clamping.

·      Workpieces larger than table surface are machinable.

·      Facilitated interaction with CAD/CAM system, simplified CNC or FMS programming.

·      Reduced consumption of tools.

·      Improved finishing and greater accuracies.

·      More convenient and high efficiency.

·      Suitable for heavy milling i.e. 1-6 mm depth of cut at recommended speed & feed.

·      Variable supply unit to vary power which helps in alignment of jobs.

·      Chuck is tested for Slippering force, Waterproof test, Temperature rise test, Electrical & Demagnetizing tests.