Alfa Main Catalogue Strana 184
Nabídka komerčních zákazníků **Nejlépe prodávané z ALFRA
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INTERESTING FACTS ABOUT TML/TMC MAGNETS FREQUENTLY ASKED QUESTIONS 1. What is the unique selling point of the Alfra magnets? Whether it is a Lifting Magnet, Positioning Magnet or a Welding Angle-magnets made by ALFRA are distinguishable due to their user-friendly design and provide outstanding performance and infinite new application possibilities. The patented magnetic system eliminates scattering losses and the magnet generates an extremely compact magnetic field. A particular highlight is that the magnets are lightweight: A TML or TMC magnet easily and effortlessly achieves a lifting force that conventional lifting magnets can only reach with three times (if at all) the amount of dead weight. Another reason to choose an ALFRA Lifting Magnet is that TML and TMC magnets attain an excellent performance even on thin material–with a minimum thickness of only 1 mm! 2. How do I know how much the magnets can lift? A clearly arranged graphic can be found on the magnet’s label indicating its load-bearing capacity, dependent upon the material’s thickness. For detailed information on the load-bearing capacity of TML magnets and the factors that influence it, please refer to the operating instructions of your Lifting Magnet. The TML 250 can for example safely lift 50 kg (195 lbs) of steel at a thickness of 2 mm (1/16") and 240 kg (530 lbs) of steel at a thickness of 8 mm (5/16"). A safety factor of 3:1 is always included. That means that, in fact, the magnet could lift 150 kg (330 lbs) of steel at a thickness of 2 mm (1/16") and 720 kg (1,590 lbs) of steel at a thickness of 8 mm (5/16") without tearing off. The 3:1 safety factor is required by law. Be sure to work within the safety measures of the lifting scale and observe the performance data and safety instructions of the operating manual. 3. What do the terms residual magnetism and pretension mean? These terms describe a reduced magnetic field that the magnet generates even when it is not activated. This pretension allows the customer to attach the magnet onto a vertical surface or even over his head and align the magnet without it falling off. Thus, he can move the magnet to the perfect position for an optimum lifting process before pushing the activation lever down. 4. What is an air gap? The small distance that may form between the magnetic contact area and the surface of the workpiece is referred to as an air gap. It may for instance occur due to a deformation of the material during the lifting process. An air gap that is too big will result in the breakaway of the magnet from the material surface. Therefore the entire magnetic contact area should rest on a plane surface of the material being lifted. 184 5. What is the advantage of the tight-fitting activation lever of the TML 250, 400 R, 500 and 1000? The activation lever of conventional magnets protrudes at an angle of 90 degrees and sticks out to the side of the magnet–in most cases by several centimeters/inches. For this reason, the magnet can only be attached to areas that are wide enough for the protruding lever. Due to its user-oriented design, the stable activation lever of the ALFRA TML magnets, TML 250, 400 R, 500 and 1000 rests closely against the magnet housing. As the lever of the TML magnet is parallel to the base body of the magnet, it allows for the easy and effortless attachment of the magnet to narrow areas e.g. between I-beams. 6. Why is the bottom plate of ALFRA magnets hardened and coated? The magnetic contact area is located on the underside of the magnet. The installed permanent magnets generate an extremely powerful magnetic field to ensure an optimum magnetic adhesion. High-quality, specially hardened steel with approx. 450 HV 30 (approx. 1400N/mm2) prevents damage to the magnetic contact area and protects it from wear and tear. A TiN-coating by means of 2500 HV 0.05 additionally increases the durability of the magnetic contact area. For this reason, ALFRA magnets provide a long service life. Another advantage: the regrinding of the lower plates required with conventional magnets is no longer necessary with the Alfra models of the TML and TMC series. 7. What is a magnetic shearing stroke? The term shearing stroke describes the vertical lifting of a work piece. The most common kind of shearing stroke is the sidelong vertical lifting of steel sheets or thin steel beams from a stack. Due to this, the Lifting Magnet is able to vertically lift the work piece up to 90°. In contrast to conventional magnets, the TML Lifting Magnet even allows for the lifting of a 4 mm (5/32") thick single steel sheet from a stack. This means that the magnet’s attractive force will not be exerted onto the subjacent work piece. With an ALFRA TML magnet, the so-called ‘sticking together’ of two work pieces now belongs in the past. 8. Can rust or paint reduce the magnet’s load capacity? Magnetic Clamps and Lifting Magnets also achieve an excellent adhesive force even on rusty, lacquered or powder-coated surfaces. For detailed information on the performance of your TMC or TML magnet please refer to the operating instructions.
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