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Selecting the type of magnetic work holder that best fits an automation environment requires the process engineer to learn a few basic [url=http://www.thehygienerevolution.com/barbour.php]barbour paris[/url] guidelines.

Today's machine shops, factories or material handling operations rely on automation to maintain quality, safety and reduce costs. Robotic manufacturing cells, CNC machine control centers, automated pick and place operations, and remotely controlled cranes leverage the power of automation technologies. Yet, when considering the options for [url=http://www.achbanker.com/home.php]hollister[/url] work holding and lifting applications, many of the traditional techniques are ill suited for [url=http://www.rtnagel.com/louboutin.php]louboutin pas cher[/url] automation. [url=http://www.ilyav.com/uggpascher.php]ugg pas cher[/url] Clamps and vises or slings and chains have to be attached to work pieces [url=http://www.mansmanifesto.fr]doudoune moncler homme[/url] or lifted material by hand. [url=http://www.dataguru.cn/?mod=spacecp&ac=blog&blogid=]hollister france How To Verify The Reputation Of O[/url] An option to the traditional techniques is magnetic work holding. They can provide both secure support of [url=http://www.vivid-host.com/barbour.htm]barbour uk outlet[/url] a work piece or lifted material but also are readily integrated into an automated operation. Selecting the type of magnetic work holder that best fits an automation environment requires the process engineer to learn a few basic guidelines.

Overview of Magnetic Work Holder Types

In general, there are three types of magnetic workholders sold in the marketplace today: permanent, electromagnet and electro-permanent. The permanent magnetic type uses permanently magnetized material to generate the holding force. They do not require electrical power, which eliminates hazards caused by power interruptions and gives them the added benefit of portability. The electromagnetic type uses an energized electrical coil wound around a steel core embedded in the lifter to generate the holding force. [url=http://www.vivid-host.com/barbour.htm]barbour uk[/url] A D.C. controller or rectifier provides the excitation voltage to energize the magnet. However, the primary disadvantage is they require the continuous application of electrical power to operate. So, a power failure would de-energize the magnet and create a potential safety hazard.

Indirect Control

The permanent magnetic workholder cannot be directly controlled for automation purposes since it is operated manually by an actuator located on the side of the magnetic lifter or chuck. While it offers the advantages of all magnetic work holders, the inability of the permanent magnetic work [url=http://www.1855sacramento.com/woolrich.php]woolrich parka[/url] holder to be directly controlled via automation is indeed a limitation. However, it can be indirectly [url=http://cgi.www5d.biglobe.ne.jp/~rainman/keiji4-1235/yybbs.cgi]hollister france La Bourse de[/url] controlled in an automated operation because it does not require electrical power to operate thereby making it portable. This portability allows for the indirect control of a work piece in, for instance, an automated palletized operation.

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The electro-permanent and the electromagnetic work holders can be remotely controlled in an automated operation. Both of [url=http://www.thehygienerevolution.com/barbour.php]barbour[/url] these types of magnetic work holders are [url=http://www.1855sacramento.com/moncler.php]moncler sito ufficiale[/url] energized or de-energized via a chuck [url=http://www.1855sacramento.com/peuterey.php]peuterey outlet[/url] controller, which is essentially an AC to DC rectifier that produces the excitation voltage for the electrical coils of the magnets embedded in the chuck or lifter. Hence, by integrating the controller into the automation control system, the magnet can be controlled from a centralized control center or a remote location. But there are variations on how these two types of magnetic work holders are remotely controlled. They are:

Electro-Permanent: the magnetic work holder only needs to be enabled briefly to energize the lifter or chuck. It will hold until it is disabled. Thus, this type is both failsafe and portable.
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Electromagnetic: this magnetic work holder requires power for all operations: enable, disable and operation. Hence, additional systems such as power conditioners and/or uninterruptible power supplies to ensure power integrity would be required for safety purposes.