LIFTING MAGNETS Lifting magnets are used for raising pieces of iron, both flat and cylindrical, especially in the following situations: • For loading and unloading pieces in machine-tools. • For storage and distribution of iron materials. • For handling large pieces in fitting sections. The magnetism in SELTER lifting magnets is created by permanent magnets, they are completely autonomous and do not need an electrical power supply. The great resistance to demagnetisation of the neodymium magnets used guarantee a long life for the lifting magnet under normal working conditions. In all the lifting magnet models the magnetisation and demagnetisation is achieved by moving a lever. All models are graded for a determined nominal lifting force. This force is 3 times less than the real load detachment force (safety coefficient = 3). An individual control certificate is supplied with each lifting magnet, indicating the detachment force after trials carried out on a test-bench. To choose a model, apart from load weight, 4 factors influencing the lifting force must be taken into The magnetic flux of the lifting magnetic easily passes through iron; this is not true however with air or nonmagnetic materials. If a separation (air gap) is caused between the lifting magnet and the load, the magnetic flux is weakened which also reduces the lifting force. Oxide, paint, dirt, paper or a rough finished surface produce an air gap and therefore a reduction in the lifting force. The magnetic flux of the lifting magnet needs a minimum thickness of iron to work. When the piece does not have this minimum thickness the lifting force is reduced. When the length or width of the load increases, the extremes curve downwards and the piece is not as flat which produces an air gap between the lifting magnet and the load, especially with thin pieces. When this happens the lifting force is reduced. THE LOAD MATERIAL Low carbon steels are good magnetic conductors, for example ST-37 (non- alloy steel 0.1-0.3%C). However, high carbon steels or alloys with other materials lose their magnetic properties and reduce the lifting force. Heat treatments affecting the structure of the steel also reduce lifting force. The nominal force of SELTER lifting magnets is for a low carbon steel, like ST-37. TABLE B: FACTORS AFFECTING THE LIFTING FORCE LOAD MATERIAL Non-alloy steel 0,1-0,3% C 100% Grey cast iron GG20 50-60% Nondistorting-alloy steel tempered at Austenitic stainless steel, Brass, 0% Aluminium, Copper

New range of lifting magnets, for use with flat and cylindrical pieces. Bipolar conception and great penetration power, even with large air gaps. Safety blocking lever in both magnetised and demagnetised position. Designed for magnetising and demagnetising with only one hand. Smooth setback to the demagnetised position. The safety coefficient is 3: load detachment force is 3 times higher than the nominal force. Easy to carry due to its low weight. Detachment force is between 70 and 115 times the weight The possibility to grind the magnetic contact poles, enable the maintenance and avoid the power...