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The company Selter specializes in the design and manufacture of industrial magnetic applications; however, when it was founded in 1956 its main activity was limited to the manufacture of magnetic chucks. In the sixties, the range of chucks was extended with the addition of other magnetic and electromagnetic products. The company started to export its products in 1969, and as they have become more and more successful it now exports to Europe, Unites States and other American and Asian countries.
Selter has more than 45 years of experience in the manufacture of magnetic applications, guaranteeing the quality of its entire range of magnetic and electromagnetic products, which are mainly used in the machine-tools sector and in general industry. As well as these products, Selter also manufactures customized magnetic applications that perfectly adapt to the customer’s specific requirements. Selter’s commercial and technical staff are at your disposal for any enquiries you may have about its products. |
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| Magnetic chucks |
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| Permanent Magnetic Chucks > Platos magnéticos |
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The permanent magnetic chuck is used to hold iron pieces, particularly in the machining industry, and its operation is based on the magnetism created using permanent magnets.
The use of permanent magnetic chucks in different machining operations offers many advantages to improve productivity:
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| Permanent Magnetic Chucks > Nor-Pol / Fi-Pol, for Grinding |
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These chucks are ideal for grinding different kinds of pieces, and give good results with small, narrow pieces.
They are completely coolant-tight and oil-tight and can operate totally submerged in these liquids. Magnetisation is carried out via the lever, and chucks with lengths over 650 mm have 2 levers. The shaft on smaller chucks does not project from the chuck and can be handled using the Allen key supplied. The clamps used to hold the chuck are supplied separately and must be ordered expressly. Available in two different pole spacings: Nor-Pol and Fi-Pol. NOR-POL Pole spacing of 6-5 (6 mm of steel and 5 of brass). It is suitable for all kinds of pieces with thicknesses as small as 2 mm to the very largest pieces. FI-POL It has a narrower pole spacing: 6-1.5-2-1.5 (6 mm of steel, 1.5 of brass, 2 of steel and 1.5 of brass). It has greater holding power for small or narrow pieces (less than 3 mm), and for larger pieces, it gives a similar result to Nor-Pol. |
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| Permanent Magnetic Chucks > Max-Pol, for Milling |
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With a more robust construction and greater magnetic power, this chuck is designed for use with milling machines.
Its pole spacing of 8-5 (8 mm of steel and 5 of brass) is suitable for all kinds of pieces with thicknesses of 5 mm to the very largest pieces. It is completely coolant-tight and oil-tight and can operate totally submerged in these liquids. Magnetisation is carried out via the lever, chucks with lengths over 650 mm have 2 levers. The clamps used to hold the chuck are supplied separately and must be ordered expressly. |
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| Permanent Magnetic Chucks > EDM, for Spark-Erosion |
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This chuck is equipped with a cleaning system in the electrode work area, which is achieved by the circulation of dielectric liquid from the holes made in the top of the chuck. These holes are interconnected via internal ducting, and the dielectric liquid is filled through a single 1/8 Gas opening in the side of the chuck.
Fi-Pol pole spacing (6 mm of steel, 1.5 of brass, 2 of steel and 1.5 of brass). Good holding power for all kinds of pieces. The magnetic field is very low (approx. 6 mm) to prevent interference with the electrode. Magnetisation is carried out via the lever. The shaft on smaller chucks does not project from the chuck and is adapted for handling with the Allen key supplied. The clamps used to hold the chuck are supplied separately and must be ordered expressly. |
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| Permanent Magnetic Chucks > With Extra-Fine Pole Spacing |
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This chuck is very low (40 mm) and has very fine pole spacing of 1.5-0.8 (1.5 mm of steel and 0.8 of brass).
It is suitable for very small or narrow pieces on grinding or spark-erosion machines. It is completely coolant-tight and oil-tight and can operate totally submerged in these liquids. The magnetisation shaft does not project from the chuck and can be handled using the Allen key supplied. The clamps used to hold the chuck are supplied separately and must be ordered expressly. |
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| Permanent Magnetic Chucks > Circular Models |
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This model is designed for use on lathes and grinding machines. It is installed using a chuck back plate, in the same way as for a normal jaw chuck .
It offers progressive magnetisation to help centre the piece. Chucks of 250ø or more are prepared for making an hole in the centre of the top plate in order to fit a stop or centring device. It is available in two different pole spacings: Fi-Pol and Max-Pol. FI-POL Fine pole spacing: 6-1.5-2-1.5 (6 mm of steel, 1.5 of brass, 2 of steel and 1.5 of brass). Suitable for small or narrow pieces (less than 5-mm wide). Chucks of 100ø and 130ø have 4 mm of steel instead of 6. MAX-POL Pole spacing of 8-5 (8 mm of steel and 5 of brass). It has greater magnetic power than Fi-Pol and is suitable for all kinds of pieces, from thicknesses of 5 mm to the largest pieces. |
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| Sine tables > Sine Tables, with Nor-Pol / Fi-Pol Magnetic Chuck |
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The sine table allows pieces with some inclination to be ground. The angle of inclination is adjusted from 0° to 45º using gauge blocks.
The oscillation of the table can be blocked to avoid movements whilst it is in use. The magnetic chuck is incorporated in two different pole spacings: Nor-Pol and Fi-Pol. The clamps to hold the table are supplied separately and must be ordered expressly. This model is available in two different types: SINGLE AXIS OF ROTATION: With one longitudinal axis of rotation. DOUBLE AXIS OF ROTATION: With one longitudinal and one transversal axis of rotation. |
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| Sine tables, with Magnetic chuck with Extra-Fine Pole Spacing |
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This table is very low (77 mm) and has a magnetic chuck with extra-fine pole spacing incorporated.
It is suitable for grinding pieces with some inclination. The angle of inclination is adjusted from 0° to 45º using gauge blocks. The oscillation of the table can be blocked to avoid movements whilst it is in use. The clamps to hold the table are supplied separately and must be ordered expressly. This model is available in two different types: SINGLE AXIS OF ROTATION: With one longitudinal axis of rotation. DOUBLE AXIS OF ROTATION: With one longitudinal and one transversal axis of rotation. |
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| Electromagnetic Rectangular Models |
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This chuck is universal with good magnetic holding, and is suitable for all kinds of work on grinding machines or milling machines depending on their pole spacing.
The chuck does not heat up even after several hours of operation. It has a long working life due to the watertight integrity of the coil. 20-4 POLE SPACING: Transversal pole spacing of 20 mm of steel and 4 of brass. Suitable for all kinds of pieces. FINE POLE SPACING: Finer pole spacings are available for grinding small pieces (40 mm or less). 45-5 POLE SPACING: Transversal pole spacing of 45 mm of steel and 5 of brass. Suitable for milling pieces with lengths of 80 mm or more. Good holding of the pieces with large air gaps, such as cast pieces, oxygen-cut pieces, forged pieces, etc. Input voltage 110 V DC, other voltages can be supplied on request. This chuck requires a controller for its operation, which supplies the appropriate voltages for the magnetisation and demagnetisation process of the chuck. |
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| Electromagnetic Circular Models |
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This chuck is designed for grinding machines and lathes. It is installed using a chuck back plate and has a central collector for electrical connection.
Different types of magnetic poles depending on the application. The chuck has a long working life due to the watertight integrity of the coil. Input voltage 110 V DC, other voltages can be supplied on request. This chuck requires a controller for its operation, which supplies the appropriate voltages for the magnetisation and demagnetisation process of the chuck. |
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| Electromagnetics > Controllers for Electromagnetic Chucks |
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This controller is required to completely demagnetise the electromagnetic chucks.
It consists of a metal box joined to a remote control with a 5-m cable. Input voltage: 220-240 V AC / 50-60 Hz. Output voltage: 110 V DC. WITHOUT POWER REGULATION: The chuck's magnetic power cannot be regulated. WITH POWER REGULATION: The chuck's magnetic power can be regulated from 0 to 100%. |
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| Quadri-Pol Permanent Models, for Milling |
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This chuck has square poles with great magnetic power and is specially designed to hold iron pieces in milling operations.
It is built from a solid block of steel and has great stability and rigidity with no warping. The five accessible sides of the pieces can be machined without the need for clamps or jaws. The chuck's electropermanent circuit offers the following advantages:
POLE EXTENSIONS Pole extensions can be assembled to improve the QUADRI-POL chucks. These extensions are prolongations of the chuck's square pole to a certain height. Pieces with uneven surfaces that do not lie flat on the chuck can be held perfectly by fitting pole extensions. There are two types: fixed and mobile. Mobile extensions adapt to the uneven surface of the piece and the fixed ones act as a support point. VERSIONS They are supplied in three different versions depending on the measurements of the magnetic poles.
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| Accessories for Chucks > HM Magnetic Plates, for Hard Metal Pieces |
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These plates are used for grinding hard metal pieces.
They have a magnetic side that cannot be demagnetised (it always magnetizes). The bottom side can be fitted on a magnetic chuck. CAUTION: The magnetic power of these plates is very high (16 daN/cm²) in order to hold the hard metal which is not very magnetic. They are not suitable for holding steel pieces, as it is impossible to remove the pieces from the magnetic plate. |
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| Accessories for Chucks > Flux Transmission Blocks |
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This block must be used with a magnetic chuck. It is not magnetic, but when placed on a chuck it transmits the flux from the chuck to the piece.
It is used for grinding unevenly shaped pieces. |
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| Accessories for Chucks > Blocks with Three Magnetic Sides |
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This block is permanently magnetic and has three magnetic sides to hold unevenly shaped pieces.
The bottom side can be fixed to a magnetic or electromagnetic chuck. |
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| Demagnetisers |
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| Tabletop Models |
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This demagnetiser is ideal for workshops as it removes the remaining magnetism from components, tools, screws, bearings, etc. The piece to be demagnetised should be passed over the device.
This model is not designed for continuous use and cannot be connected for more than 10 minutes at one time. It has a thermostat that disconnects its when it reaches the maximum permitted temperature (70ºC); it cannot be reconnected until the temperature has dropped to the permitted levels. Input voltage: 220-240 V / 50-60 Hz. |
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| Portable Model |
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This model is used to remove the remaining magnetism from large pieces. The device should be passed over the piece manually.
This demagnetiser is not designed for continuous use and cannot be connected for more than 10 minutes at one time. It has a thermostat that disconnects its when it reaches the maximum permitted temperature (70ºC); it cannot be reconnected until the temperature has dropped to the permitted levels. Input voltage: 220-240 V / 50-60 Hz. |
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| Tunnel Models |
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This demagnetiser is designed for continuous use, it can be connected permanently.
This model is suitable for automatic processes where there is a flux of material. The pieces to be demagnetised should be passed through the inside of the device. Input voltage: 220-240 V / 50-60 Hz. Other voltages on request. Customized models and measurements on request. |
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| Lifting Systems |
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| Lifting Magnets |
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Lifting magnets are used for lifting flat and cylindrical iron pieces, particularly in the following cases:
The magnetisation and demagnetisation is carried out by moving a lever. They are supplied with an instructions manual, control certificate and CE declaration of conformity. All the models are graded for a certain working load, which is 3 times less than the real load detachment force (safety coefficient = 3). The detachment force is calculated for a clean, smooth, flat, low-carbon steel plate with a greater thickness than the minimum. The factors that can influence the capacity of a lifting magnet must be taken into account. FACTORS INFLUENCING THE LIFTING FORCE OF A LIFTING MAGNET The Contact Surface: If the surface of the load is oxidised, it has burrs or has a rough finish the lifting force is reduced. Load Thickness: The capacities of the lifting magnets are given for a minimum load thickness. When this minimum is not maintained the lifting force is reduced. Length and Width of the Load: If the load has an excessive length or width, the ends start to bend and the piece is no longer flat, causing detachment, particularly for thin pieces. The Load Material: High-carbon steel or alloys with other materials lose their magnetic properties which reduces the lifting force. Certain heat treatments also reduce the lifting force. |
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| EMC Lifting Magnets |
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This lifting magnet is only designed for lifting flat pieces.
Its design gives very smooth magnetisation and demagnetisation, which is achieved by turning the lever 180º. Safety blocking lever to prevent accidental demagnetisation. The safety coefficient is 3. The detachment force is 3 times greater than the working force. Consult before using more than one lifting magnet for the same load, as there will be alterations in the lifting capacity. |
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| EMX Lifting Magnets |
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Designed for flat and cylindrical pieces.
It is built with neodymium magnets, with great penetration capacity, even with large air gaps. Safety blocking lever to prevent accidental demagnetising, designed to magnetise and demagnetise with only one hand.. Easy to transport as they are lightweight. Easy maintenance as the magnetic contact poles can be rectified. The safety coefficient is 3. The detachment force is 3 times greater than the working force. Consult before using more than one lifting magnet for the same load, as there will be alterations in the lifting capacity. |
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| Electromagnets |
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Electromagnets are commonly used in industry for holding and handling pieces. They use a DC power supply and are supplied without a transformer or a rectifier.
Maximum working temperature: 60º C. RECTANGULAR MODELS 24 V DC power supply (other voltages available on request). The voltage input is protected using terminals and protective housing with different possibilities for the electric cable outlet. CIRCULAR MODELS 24 V DC Series 24 V DC power supply. 20-cm long connection cable with side outlet. 12 V DC Series 12 V DC power supply (other voltages available on request). 1-m long connection cable with possibility for top or side outlet. |
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| Magnetic Drills |
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| Electromagnetic Drill Stands |
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This electromagnetic drill stand enables a drill to be mounted using couplings, which are adapted to each model and supplied with the stand. Couplings are available for most models and makes of drill on the market.
A safety chain is used to ensure the stand does not fall. Some models allow the drill to rotate and move radially with regard to the electromagnetic base, which leads to the quick, easy and accurate positioning of the drill bit. Input voltage: 220-240 V / 50-60 Hz The electromagnetic base is supplied at 24 V DC. |
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| Rota-Fres Magnetic Drills |
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A lightweight drill with great capacity. It is ideal for drilling with hollow cutters from ø12 to ø60 mm.
Internal refrigeration via the cutter (the coolant tank is supplied separately). Some models allow the drill to rotate and move radially with regard to the electromagnetic base, which leads to the quick, easy and accurate positioning of the cutter. Powerful motors of 1,200 - 1,800 W / 2-4 speeds. Precision gears for a greater working life and smoother operation. Very stable, precise guide. Electromagnetic base with double coil Supplied with case for transport and safety belt. Cutters Hollow cutters adaptable to Selter Rota-Fres magnetic drills with Weldon tool-holder ø19.05. These cutters have to work with a pin of ø6.35 mm. Cutter kits available (see accessories). |
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| Auxiliary Magnetic Products |
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| Sheet magnetic systems > Magnetic Sheet Floaters |
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These sheet floaters are used to lift steel sheets from a pile and hold them in the air. The sheets are separated from each by placing special magnetic blocks on one or more sides of the pile of sheets.
They are especially suitable for manual or automatic feeding of machines. Very robust construction using a stainless steel housing welded to an steel back plate. CHOOSING THE RIGHT KIND OF FLOATER Choosing the right floater depends on the following factors:
Maximum surface to separate per floater: For normal sheets up to 0.3 m² For sheets with oil up to 0.15 m² |
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| Sheet magnetic systems > Sheet Lifter with Handle |
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This lifter is used to lift or drag sheets by hand with maximum safety guarantees. It has a handle to drag the sheet. When the handle is lowered, it pushes a lever which releases the sheet.
Only for manual use. Not suitable for travelling cranes |
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| Sheet magnetic systems > Hand Magnet |
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| For picking up thin sheets from a pile by hand. Does not damage the sheets and prevents injuries to the hands. |
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| Sheet magnetic systems > Magnetic Jaws |
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| Particularly useful for placing pieces in presses. They prevent the operator getting their hands near the danger area. Made of plastic to prevent damage to the moulds. |
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| Magnetic Stands |
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| These stands are designed for holding dial indicators, like end stops for holding templates, etc. The magnetic bases of the stands can be supplied without the rig. |
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| Pot Magnets |
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Cylindrical magnets in a mild steel pot. They have an advantage over normal magnets as they are only magnetic on one side, leaving the other sides free from magnetism.
They can be used for many uses; i.e. as a tool for assembly, as stops, to hold pieces for bending, cutting, gluing, machining, etc. They incorporate four different types of magnet: Ferrite, alnico (AINiCo), neodymium (NdFeB) and samarium (SmCo5).
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| Pot Magnet for a Plumb Line |
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A set with a pot magnet with a holding force of 50 daN and a support with different holes to fit a plumb line.
Essential for checking perpendicularity when fitting steel girders Only the pot magnet is supplied, without the plumb line or weight. Code: 21.00.010 |
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| Magnetic Positioners and Multi-Angles |
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| These are made of a metallic case that has one or more magnets inserted. They are used to hold tools or pieces at different angles to glue or weld them, etc. |
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| Magnetic "V" Blocks |
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This block has 3 magnetic faces, 2 of which form a 90° "V".
It is very useful for holding unevenly shaped and cylindrical pieces. Gentle magnetisation via a lever. They can be supplied in pairs. Ømin. / Ømax.: 15 / 64 mm.. Precission of ^ , = , V : ± 0,02/100 mm. |
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| Magnetic Vice |
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Used to rectify unevenly shaped pieces.
Magnetised via a lever. Surfaces: Rectified and tempered at 55-60 HRc. Angle of precision: 0.01/100 mm. Maximum opening: 55 mm. |
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| Magnetic Plates for Polishing Processes |
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Used industrially to hold pieces in polishing processes.
It has permanent magnets and one magnetic side. On the bottom, it has stainless steel supports for height adjustment with screws. Simple Operation: it is fitted under the conveyor belt, where the pieces are polished, with the magnetic side in contact with the belt. When the pieces pass over it for polishing, they are retained by the force of the magnet and they are not expelled. |
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| Separating Systems |
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These magnetic systems are used to separate the iron particles from other materials in the food, clothing and recycling industries.
Plate magnets Tube magnets Cascade magnet systems Magnet filters Magnetic bars Overband magnet systems Drum magnets Head roller magnets Magnet blocks |
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| Other Magnetic Products |
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Magnetic Materials for Signalling, Signposting and Advertising Magnetic sheet Iron impregnated materials Magnetic strips and labels Plastic magnets Magnets for fixing Permanent Magnets Available in different shapes and measurements. Ferrite Magnets Alnico Magnets (AINiCo) Samarium Magnets (SmCo5) Neodymium Magnets (NdFeB) |
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