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Magnetic Chuck
Magnetic chucks are used in conjunction with a chuck key to holding the workpiece securely. This can be done with a hand-held magnetic chuck which uses a handheld magnet to attract and hold the workpiece, or by using an electromagnetic chuck which uses an electromagnet to attract and hold the workpiece. A magnetic chuck is also called a quick-release magnet, as it can quickly remove or attach pieces of metal.
Alnico Magnets are widely used in the magnetic chuck to control holding and releasing the workpiece.