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Resistance to the implementation of magnetic work holding usually begins with a concern for safety. These concerns can be allayed by assessing the technology, holding power and optimal operating conditions of magnetic work holding in terms of operational safety.

Despite the competitive benefits of magnetic workholding in reducing costs and improving productivity, there still exists a resistance to the implementation of magnetic technology as the primary work holder in machining operations. This resistance usually begins with a concern for safety. By assessing the technology, holding power and optimal operating conditions of magnetic work holding relative to operational safety, these concerns can be allayed.

Magnetic Work Holding as a Safe Technology

If a machine operator has held workpieces with mechanical clamps for decades, the idea of relying on magnetism to hold workpieces, especially in heavy milling operations, boils down to an issue of trust: Is this really safe? While understandable this opinion is rooted in subjectivity not objective fact. More than likely, those who hold this point of view may not fully understand the facts of how safe magnetic work holding is.

So, how can magnetic work holding be considered as a safe technology? By definition, it produces a uniform, consistent, and infinite holding power that does not relax, give, or decrease until an operator de-energizes it.

In general, magnetic work holders are constructed with an array of individual magnets embedded into a magnetic chuck or plate. Each magnet has a north and south pole across which flows magnetic energy called flux. When a workpiece is placed across the poles of these magnets, flux flows into it. When placed in this flux field, a magnetic field of opposite polarity is induced into the workpiece thereby creating a magnetic attraction between the chuck and the workpiece. This attraction will remain consistent, uniform, infinite, and reliable as long as the magnetic field is energized. This reliability makes magnetic workholding a truly safe technology.

Magnetic Work Holding as a Safe Holding Force

Holding power or strength is another factor considered when forming an opinion about the safety of magnetic workholding. If an operator does not know how strong magnetic workholding is, he may mistakenly believe magnetic technology is not strong enough to do the job safely. This opinion can be allayed by two facts:

(1) magnetic workholding can have a clamping power up to 1000 daN and

(2) depending upon the application, an instantaneous clamping force of 12 tons per square foot can be generated by magnetic workholders. This level of holding force is more than comparable to mechanical clamps with one additional advantage: magnetic holding force is uniform, constant and infinite until the operator de-energizes it.

Optimal Operating Conditions

To implement magnetic work holding solutions may require some training to understand the technology's optimal operating conditions. For example, magnetic work holding is best used with smooth-surfaced workpieces rather than rough ones because the smoothness decreases the air gap between the workpiece and the magnet; small air gaps increase magnetic attraction and the holding bond. Some materials are better conductors of magnetism than others. For example, annealed materials are ideal while hardened materials don't absorb flux as easily and will retain some magnetism. This condition can be corrected within seconds with demagnetization. Finally, the direction of the holding force is yet another adjustment an operator may have to make to safely implement magnetic work holding. All magnets have 100 percent clamping force directly away from the face of the magnet, but only about 20 percent clamping force against side forces. So, the geometry of a cut must be considered in the machining process to reap the advantages of this type of workholding.

DocMagnet Inc. designs and supplies Magnetic Work holding equipment. Their Permanent Magnetic Chucks have all metal surfaces and are built and tested to the highest quality.

Refurbished Clinical Laboratory Centrifuges

Small labs and hospices are always looking to save money. Purchasing refurbished clinical laboratory centrifuges for your small labs would save a lot of money. Available at highly discounted rates, these are excellent alternatives for new products.

Innovative Features and Specifications

Clinical laboratory centrifuges are used for separating particles from solutions depending on their density, viscosity, size and shape. For carrying out these clinical procedures effortlessly, you can buy clinical laboratory centrifuges with a variety of advanced features. For various clinical applications, today clinical laboratory centrifuges are available in different models including analytical, differential and density centrifuges.

The specifications and features vary according to the models used. There are systems with angled head rotors, auto-off features, LED power indicator light, unique space saving designs, lid with safety interlocks, vibration free operation and much more. Most of these products are quiet, compact, lightweight and simple to operate.

Refurbished Products with Exceptional Value

Refurbished clinical laboratory centrifuges maintain high quality standards. Most of the retailers receive a large number of used products which will be later inspected, disassembled, tested and repaired to make them as good as new. To keep the products in proper working condition, the refurbished laboratory products are thoroughly inspected and tested by the experts. They effectively fix the problems of the defective products and develop them to meet original manufacturer specifications.

Make Sure You Buy from a Dependable Dealer

You can purchase refurbished clinical laboratory centrifuges from reputable dealers or suppliers. Once you locate a dealer, make sure that you receive completely tested reconditioned products from them. There are possibilities that you might be cheated with unchecked, fake products. With quality dealers, you can find an extensive inventory of name-brand refurbished clinical laboratory centrifuges. Refurbished products from renowned manufacturers such as LW Scientific, Unico, and The Drucker Co are available at established companies like Block Scientific.

About the Author

Block Scientific is the affordable source of fine Medical Laboratory Equipments. We stock high quality branded Centrifuges including Refurbished Clinical Laboratory Centrifuges.

This is a Physics Question for my class about hyper gravity.?

At its Ames Research Center, NASA uses its large “20-G” centrifuge to test the effects of very large accelerations (“hypergravity”) on test pilots and astronauts. In this device, an arm 8.84 {rm m} long rotates about one end in a horizontal plane, and the astronaut is strapped in at the other end. Suppose that he is aligned along the arm with his head at the outermost end. The maximum sustained acceleration to which humans are subjected in this machine is typically 12.5 {it g}.

Formula for centripetal acceleration is:
Ac = v^2 / r or w^2 * r
where v is linear speed, w is angular speed, r is distance from the centre of motion.
If acceleration is 12.5g than angular speed is:
w = sq root(Ac / r ) = sq root( 12.5 * 9.81m/s^2 / 8.84m) = 3.72rad/sec
linear speed of head is:
v = w * r = 3.72rad/sec * 8.84m/radius = 32.9m/s
acceleration at feet is:
(3.72rad/sec)^2 * (8.84m-2m) = 94.9m/s^2
rpm is:
w / (2*Pi) * 60 sec/min = 35.6

New Cascade Machine On-Line at Piketon
The machine is being tested in a commercial plant configuration at the Piketon A-Plant

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