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Wysłany: Śro 15:10, 04 Wrz 2013
Temat postu: www.vivid-host.com/barbour.htm Lathe Magnetic Chuc
A magnetic chuck is the best way to clamp thin, flexible rings and discs without distorting them.
In general, a lathe chuck is a workholding clamp used with a tool or workpiece of a radial symmetry or cylindrical form. In some applications, the tool is held by the chuck while the workpiece rotates; in other applications, the reverse occurs. While there are many different types of chucks used for lathes and turning applications-clamping chucks, core chucks, diaphragm chucks, collet chucks, draw bar chucks, electrostatic chucks and others-magnetic chucks are increasingly applied for turning applications because of the high level of accessibility to the workpiece
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they provide as well as distortion free clamping. For rings
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and bearings, magnetic chucks are especially useful because of total access to the I.D. and O.D. of the part. Turning applications do not need to be stopped and restarted when a magnetic chuck is used; mechanical clamps do not
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possess this inherent advantage.
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Overview of Lathe Magnetic Chucks
Lathe magnetic chucks are constructed with a centered permanent magnet face in a radially sectored, pole distribution. Once the magnetic circuit is energized, the workpiece is held against the pole plate and closes the magnetic circuit, forming a secure bond between the plate and the workpiece. Magnetic chucks can be designed with single or double magnets. Single magnet types are ideal for turning of magnetically hard materials such as bearing steels. Double magnet types are most suitable for heavy turning of magnetically soft materials.
Process Considerations for Magnetic Control
Lathe magnetic chucks
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are typically controlled in two ways, manually or electronically, and with permanent magnets, which offer a high level of holding force combined with an intrinsic failsafe operation. Permanent magnetic control is actuated by a lever located on the chuck. It turns the holding force on or off; no electrical power is needed, giving it a failsafe feature. Electro-permanent magnetic control uses a chuck controller that applies a variable D.C. excitation voltage to the chuck to turn the magnetic holding force
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on or off. Power is not needed to maintain the force. This also gives the electro-permanent control type a failsafe operation. Additionally, the electro-permanent control can vary the holding force
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a
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variety of applications. This is accomplished by the chuck controller, which can vary the magnetic force by applying different levels of excitation voltage.
While the electromagnetic control type is an option, it needs constant power to operate the chuck, hence, does not have the failsafe feature, which
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can be a safety hazard in locations
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where electrical power is unreliable.
Distortion Free Clamping
A magnetic chuck is the best way to clamp thin,
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flexible rings and discs without distorting them. By using radial, T-slotted poles as well as pole extensions to raise the workpiece from the pole
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plate, complete access to the ID and OD faces eliminates clamping distortion.
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