✅ DIY electromagnetic table -

How to make an electromagnetic table from a microwave transformer - for plumbing and welding work

In this review, we want to share with you an interesting idea on how to make an electromagnetic table for welding and plumbing work with your own hands.

This idea (and its implementation) was shared by the author of the YouTube channel Gianni Pirola Fai Da Te.

The advantage of an electromagnetic table is that there is no need to use a vice, clamps or other devices for fixing metal workpieces.

On a homemade electromagnetic table you can both weld workpieces and process them: cut with a grinder, grind, etc.

transformer from a microwave oven (microwave);
power unit.

DIY magnetic table

Tools for grinding flat surfaces

When grinding, parts can be secured directly to the machine table using clamping bars. However, such fastening is used in cases where the parts cannot be fixed to a magnetic plate or other devices.

Pattern vices (Fig. 10.9a) differ from conventional machine ones in manufacturing precision and the ability to turn. The fixed jaw of the vice is integral with the base 1. The body has grooves for the passage of the movable jaw 2, which is moved by a screw 3. The base of the body has threaded holes for attaching the vice to various devices. All vise planes are machined at an angle of 90°. The pressed-in cylindrical measuring pin 4 is used to measure inclined planes.

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Rice. 10.9. Pattern vice (a) and electromagnetic plate (b)

Electromagnetic plates . The design of the electromagnetic plate (Fig. 10.9b) is based on the following principle. If a wire is wound around an iron core (Fig. 10.10a) and a direct current is passed through it, the core will be magnetized. If you now bring a steel object to one of the ends of the core, it will be strongly attracted to the core. After the current in the winding stops, the magnetic action of the core will also stop.

You can bend such a core in the form of a horseshoe (Fig. 10.10b) and also pass current through its winding. In this case, the magnet will be even stronger. By combining horseshoe-shaped magnets into a group, we get an electromagnetic plate.

Rice. 10.10. Diagram of the magnetic action of current (a) and a horseshoe magnet (b)

The magnet poles located on the top of the plate are carefully insulated from its body with non-magnetic alloys (babbitt, zinc), due to which the magnetic forces are not dissipated in the body of the plate, but are directed directly into the body of the part. Only magnetic metals (for example, steel, iron, cast iron) can be attracted to the electromagnetic plate.

Electromagnetic plates are used in various sizes, round and rectangular. Only direct current is suitable for powering them, so machines are installed with devices that convert alternating current into direct current.

Electromagnetic plates provide reliable and quick fastening of the parts to be ground. To maintain the functionality of the plate, it is necessary to protect it from shocks and shocks, and also to ensure that no coolant gets on the windings. Upon completion of work, you should immediately wipe the working surface of the stove dry.

Magnetic plates

In addition to electromagnetic plates, magnetic plates with permanent magnets are used on grinding machines. This type of stove does not require special generators and rectifiers with wiring and distribution devices. However, as a rule, the force of their attraction is weaker than the force of attraction of electromagnetic plates.

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The design of a rectangular magnetic plate and its operating principle are shown in Fig. 10.11. Its upper part is made of steel plates 1 with non-magnetic layers 2 between them (Fig. 10.11a). Strong permanent magnets 4 can be moved, closing them either to the iron plates or to the part being fixed. In Fig. 10.11b shows the position of the magnets when fastening parts 5, and in Fig. 10.11c – during their removal or installation. The magnets are switched using handle 3. The lower part of the plate 6 is fixed on the machine table.

Rice. 10.11. Magnetic plate:

a – general view; b – position of the magnets when securing the part; c - the same when installing and removing the part

Segmented grinding wheels for grinding flat surfaces

Surface grinding with solid grinding wheels of large diameter is economically unprofitable due to large waste, increased heat generation and the possibility of breakage during transportation. In addition, if a crack appears or partial destruction of the wheel, it is necessary to replace it entirely and lose a significant amount of usable abrasive material. These inconveniences are eliminated when using wheels made from inserted abrasive segments (Fig. 10.12). If one or more of them breaks, such segments can be easily replaced with new ones.

The insert segments are used until they are almost completely worn out. By releasing 1 clamp, you can remove 2 segments at once. As they wear, the height of the segments decreases, so spacers are placed under them.

Rice. 10.12. Segment grinding

DIY magnetic plate - Metals, equipment, instructions

Magnetic plates for grinding machines are a special class of metalworking equipment that is designed to hold steel workpieces on the working surface under the influence of electromagnetic attraction forces.

It would seem, why use such a sophisticated design when you can use traditional cams as a clamp, which reliably clamp the workpiece and provide maximum rigidity during processing? In fact, electromagnetic fixation using magnetic plates for grinding machines has a number of advantages, which we will discuss below.

The key advantage is the ability to operate the equipment in multi-threaded mode. The master can simultaneously fix several workpieces on one installation, thereby increasing the productivity of his work by an order of magnitude. In addition, the magnetic plate for the grinding machine can ensure extreme precision in machining the workpiece.

This is due to the fact that during the grinding process the metal part heats up and, accordingly, expands. In this case, the workpiece clamped in a vice is deformed, while the workpiece mounted on the electromagnetic plane expands freely on the working surface.

It is worth remembering that the plate is not capable of providing as much force as the locking cams. In addition, if an emergency interruption of the power supply occurs, the workpiece will fall off the working surface. That is why the scope of application of magnetic plates for grinding machines excludes work that requires high cutting forces.

Another disadvantage of such installations is the phenomenon of residual magnetism inherent in steel workpieces that were processed in this way. Fortunately, you can cope with the problem using a demagnetizer, which in most cases allows you to close your eyes to the above-described drawback.

How to make a simple electromagnet - step-by-step instructions with diagrams

Such a device is convenient because its operation is easy to control using electric current - changing the poles, changing the force of attraction. In some matters it becomes truly indispensable, and is often used as a constructive element of various homemade products. It’s not difficult to make a simple electromagnet with your own hands, especially since almost everything you need can be found in every home.

What you will need

Any suitable sample made of iron (it is highly magnetic). This will be the core of the electromagnet.
The wire is copper, always with insulation to prevent direct contact of the two metals. For a homemade electric magnet, the recommended cross-section is 0.5 (but not more than 1.0).
DC source - battery, battery, power supply.

Additionally:

Connecting wires for connecting an electromagnet.
Soldering iron or electrical tape to secure contacts.

Device and principle of operation.

3.1. The plate consists of three main parts: movable and fixed magnetic blocks and a housing. Magnetic blocks are assembled from steel plates, between which ceramic permanent magnets are located. The free space between the steel plates is filled with non-magnetic material.

Rice. Magnetic plate device

3.2. When switched on, poles 2 of the power unit lie on non-magnetic elements 5 of housing 1, directing the entire magnetic flux of magnets 3 through adapter 4 and parts 6. when switched off, poles 2 are located under non-magnetic spacers of the adapter. As a result, the magnetic flux has a new direction.

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3.3. The movable magnetic block is located inside the housing and can be moved using an eccentric wolf to the right or left by turning the handle 180˚. In the off position, magnetic circuits with different polarities are combined; there is no non-magnetic flux on the working surface.

Compared to electromagnetic plates and hydraulic or pneumatic devices, they have the following advantages:

do not require connection to an energy source;
allow you to achieve higher precision when processing workpieces;
provide absolute reliability of fastening;
maintain the main technical parameters during the entire service life at the original level;
do not require periodic repairs and maintenance

Do-it-yourself electromagnetic table - Metalist's Handbook

It is worth remembering that the plate is not capable of providing as much force as the locking cams.

In addition, if an emergency interruption of the power supply occurs, the workpiece will fall off the working surface.

That is why the scope of application of magnetic plates for grinding machines excludes work that requires high cutting forces.

How do surface grinding machines work?

The vast majority of parts made of metal undergo a technological operation such as grinding. To perform this with high efficiency and accuracy, surface grinding machines are used.

A rather difficult to manufacture banding machine with excellent functionality

Surface grinding machines of serial models can process both flat and profile parts. The surface processing accuracy that can be achieved using such devices is 0.16 microns. Of course, it is almost impossible to achieve such a result when processing on machines made by yourself. However, even the accuracy that homemade machines allow to obtain is quite sufficient for many metal products.

The load-bearing structural element of the machines of this group (as well as any other equipment) is the bed. Its dimensions directly determine what size parts can be processed on the machine. The most common material for manufacturing beds of surface grinding equipment is cast iron, since this metal, due to its characteristics, perfectly dampens vibrations, which is especially important for devices of this type.

Work table and controls of the 3G71M grinding machine

The structural element of surface grinding machines on which the workpiece is fixed is a work table having a round or rectangular shape. Its dimensions can vary significantly depending on the specific model of surface grinding equipment. The workpieces can be fixed on such a work table due to its magnetized surface or using special clamping elements. During processing, the work table makes reciprocating and circular movements.

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In mass-produced surface grinding machines, the work tables are driven by a hydraulic system. In self-assembled equipment, mechanical transmissions are used for this.

Grinding a steel workpiece fixed on the working surface of the machine using a magnetic field

Important elements of the design of surface grinding equipment, which ensure the accuracy and smooth movement of the work table, are guides. In addition to high precision manufacturing, the guides must have exceptional strength, since in the process of almost constant movements of the desktop they are subject to active wear.

To achieve high processing accuracy, the guides must ensure accurate, smooth (without jerking) movement of the worktable with minimal friction of the contacting elements. That is why high-strength steel is used for the manufacture of these structural elements, which is hardened after the guides are made from it.

Option for manufacturing guides using angles and bearings

The working tool of a surface grinding machine, which can be a grinding wheel or an abrasive belt, is mounted on the spindle of the headstock. Rotation of the working tool, for which the main electric motor is responsible, can be transmitted through a gearbox or belt drive.

For do-it-yourself surface grinding machines, you can choose a simpler option: select the diameter of the grinding wheel so that it can be mounted directly on the electric motor shaft. This will eliminate the need to use a gear or belt drive.

Magnetic table for grinding machine

» Machine » Magnetic table for grinding machine

One of the main components of a grinding machine is a fixing element, with the help of which the workpiece is secured for further processing. Along with mechanical components, magnetic plates have become widespread, which differs from analogues not only in reliability, but also in good performance properties.

General information about the design

Mechanical magnetic plate

The main advantage of magnetic plates is their good workpiece fixation rate, as well as their relatively small size. To complete the machines, two types are used: electromagnetic and magnetic. They have significant design differences.

The stove has a fairly simple operating principle. A magnetic field is created on its surface, which holds metal-containing workpieces on the table surface. This allows you to process not only the outer plane of the materials, but also the end areas. In some cases, it is possible to grind several parts at the same time. Thanks to its magnetic properties, additional equipment or auxiliary devices can be installed on the work surface.

Design features of various types of magnetic plates:

electromagnetic plate. It consists of a housing, inside of which there are two groups of electromagnetic coils. They are separated by a non-magnetic layer. When electricity is supplied to the installed part, an electromagnetic field is formed, which fixes the workpiece. The disadvantage of this design is the lack of clutch in the event of a power outage. Therefore, it is recommended to install a machine deactivation relay when such a situation occurs;
magnetic plate. Structurally, it resembles an electromagnetic model. It also contains two groups of magnets that differ in polarity. Blocks of non-magnetic material are installed on the working surface of the stove. In their normal position, they prevent the emergence of a magnetic field. With the help of a mechanical device, they are shifted, as a result of which the workpiece is securely fixed on the table.

The mechanical magnetic plate has a high degree of reliability, but to turn it on/off you need to turn the lever. This affects the speed of changing the positions of parts, and as a result, productivity. Therefore, electromagnetic models are most often used for mass production, and mechanical ones for more precise processing.

In addition to horizontally oriented grinding plates, a device for cross-drilling rollers can be used. Magnets are located along the workpiece, which makes it possible to process cylindrical parts of complex shapes.

Technical specifications

Magnetic plates are rarely included as standard equipment in factory equipment. Most often they are purchased separately. Therefore, it is important to know their main technical characteristics, which must correspond to the parameters of a specific machine model.

The determining parameter is the dimensions. The size of the plate can vary from 10*25 cm to 32*100 cm. Moreover, as the dimensions of the device increase, its weight increases. This directly affects the maximum weight of the workpiece, since the plate is installed on a standard work table.

The main parameters that a magnetic plate should have:

dimensions and weight. Not only width and length are taken into account, but also height. It may affect the maximum permissible part size;
specific force of attraction. It must be uniform over the entire installation plane. Typically this parameter ranges from 50 to 120 N/cm²;
distance between poles. This characteristic determines the minimum size of the workpiece.

During operation, the magnetic plate can change the geometry of the workpiece. Therefore, the process of installing and subsequently removing the part should be as careful as possible. You should also take into account the main disadvantage of electromagnetic models - heating of the surface during activation. This is not only the main reason for device failure, but also affects the properties of the workpiece.

The video shows an example of how a small magnetic plate works:

stanokgid.ru

Magnetic plates for grinding machines

Magnetic levitation at home

In the 90s of the 20th century, the Levitron toy, based on the influence of a magnetic field, became very popular.

This is a levitating top hovering in the air. A similar toy can be assembled at home to understand the essence of magnetic levitation. How to make Levitron - we will present detailed instructions.

List of materials:

wooden board;
a simple pencil;
insulating tape;
washers made of plastic or brass;
cardboard;
13 neodymium disk magnets brand N52, size 12*3 mm;
wide ring magnet with an outer diameter of 20, an inner diameter of 10 mm, brand N42.

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Description of the assembly process step by step:

Making a layout. Initially, the top was assembled on two ceramic ring magnets. In our design we will use standard neodymium magnets. First, let's print out a diagram of the marking holes for installing magnets. Before starting work, check the conformity of the dimensions in the printed diagram and those indicated in the source code. If everything matches, then cut out the layout.
Preparing the foundation. Attach a paper diagram to the board and mark according to it. Please note that the thickness of the wooden blank must be 6mm or more.
Transfer of all circuit blocks to the base. Glue the paper carrier to the resulting base. Using a Forstner drill (d=12mm), punch the center of the circles. This will ensure further drilling accuracy.
We drill holes. Using a Forstner drill (d=12mm), we make holes in the workpiece so that the bottom of the hole extends 3 mm into the top of the block. The magnets should be positioned as close to the top as possible.
Installation of magnets. When the holes are ready, you have double-checked their dimensions, install the magnets with one pole facing up, for example the south one. To determine the polarity, you can use the marked D68PC-RB magnet. Place the block on a steel plate to make it easier for the magnets to move to the bottom of the holes. Let's take N52 magnets and place them in the holes, one at a time, as deep as possible. If you need to push the magnet through, you can use a wooden dowel.
How to make a top. Take a pencil 40 mm long with a pointed end. We wrap electrical tape around it to increase the diameter to fit the central part of the ring magnet. Insert the pencil into the magnet so that the south pole is at the bottom, like the pointy part of the pencil. To add weight to the top, use plastic or brass washers: put several on top. To ensure proper operation, it is necessary to determine the acceptable number of washers using the selection method.
Let's start the system. Cut cardboard or plastic for the platform. Place it on a magnetic base. On the platform, the top begins to spin and gradually rises with the platform until it falls into the magnetic field well.

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If everything is done correctly, the top will freeze. Debugging the mechanism may take a long time.

Tips for adjusting the top:

Try to ensure the base is balanced. Use pieces of cardboard or paper to raise the sides of the base and level it. If it deviates from the center to some side, lift it by placing pieces of paper under it.
Apply three-point leveling.
Consider the weight of the top: the device assumes the presence of a magnetic pit - the strength of the magnet in the center is weaker than near the edge. To keep the magnet in the center, you should add weight (when the top flies out) or decrease it (if the top does not rise from the platform).
Another significant indicator is the height of the platform: a low platform does not allow the top to spin sufficiently. Therefore, you need to place paper or cardboard under it.
If you have a 3D printer at hand, you can print a toy on it.

Thus, it is possible to make Levitron with your own hands at home. Based on the presented materials, you can design various souvenirs and interior items that can please you and your friends. In addition, you can show all kinds of tricks with magnets and levitation to children.

Magnetic tables. Coordinate tables

Dovetail guides.
The flywheel division value is 0.05 mm.
Millimeter scale, 2 stops.
Chutes for draining coolant.

KT120

TO TOP []

2 x- COORDINATE ROTARY TABLE FA

Rotate 360°

Size

TO TOP []

2 x- COORDINATE TABLE RKA

Longitudinal feed - 80mm; cross feed - 50mm; table groove width - 10mm; distance between grooves - 35mm; the distance between the mounting holes is 115x100mm.

CNC installation possible

Size

TO TOP []

2 x- JOINT TABLE BKA

Longitudinal feed - 180mm; cross feed - 100mm; table groove width - 16mm; distance between grooves - 65mm; the distance between the mounting holes is 182mm.

CNC installation possible

Size

TO TOP []

1 x- COORDINATE TABLE AKA 180

Longitudinal feed - 180mm; table groove width - 16mm; distance between grooves - 65mm; distance between mounting holes - 182mm

User manual

The magnetic plate should be re-opened and the equipment passport should be examined.

Place it on the machine table.
Check that the mounting is correct and start working.
A workpiece made of ferromagnetic material must be placed on the working surface in the required position and the lever must be rotated 180 degrees. Check the reliability of the fastening.
Start processing the workpiece.
Metal shavings generated during operation can be removed with a brush after turning the handle 180 degrees. Then, after cleaning the surface, you need to fix the workpiece again using the handle.
Upon completion of work, turn the handle and remove the workpiece.

Specifications

Technical conditions for the production of magnetic plates are regulated by GOST 16528-87 . It describes all the characteristics of stoves with different types of control.

The main parameters affecting the operation of magnetic plates are:

Overall dimensions – minimum starting from 10x25 cm and maximum up to 32x100 cm. The final dimensions of the workpiece depend on this value. Also, the significant size of the plate increases the load on the machine’s work table.
Magnetic force - acts constantly and when not in working position it is prevented by blocks of non-magnetic material. The range of action of this value is 50–120 N/cm².
The distance between magnetic poles or coils. The smallest size available for the part being manufactured depends on it.

Purpose

The effectiveness of this simulator has long been proven by experts. Such tables are intended for the treatment of various diseases of the musculoskeletal system .

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Inversion tables are effective for the following diseases and pathologies:

moderate postural disorders (initial stage scoliosis);
chronic spasms in the muscles of the back or neck;
as a prevention of varicose veins on the legs;
for training people who lead a sedentary lifestyle;
chronic stress as relaxation;
to strengthen the back muscles.

Keep in mind that you shouldn’t expect any special miracles from using an inversion table .

Although it is used for the treatment and prevention of various pathologies, as a separate treatment method, it has little effect. Since the simulator treats existing diseases and does not in any way affect the cause of their formation.

Therefore, exercises on an inversion table must be combined with other treatment methods, for example, lifestyle changes.

You can buy a finished product in a store, or you can make it yourself. If you have little experience in manufacturing and assembling furniture items, you can resort to the second option.

Making a tabletop with lighting from New Year's garland

There is an easier way to make your own table with an infinity effect. In this case, instead of an LED strip, a regular New Year's garland is used. First, a square or rectangular frame is made from bars, then the number of light bulbs on the garland is counted.

After this, marks are placed on the frame in the places where the light bulbs will be located. It is recommended to place them at a distance of about 2 cm from each other. At the next stage of work, holes for light bulbs are drilled in the frame of the future table.

Then light bulbs are inserted into these holes and secured there. Then you need to glue the frame onto the mirror with your own hands, and glue glass with a mirror film on top of the frame.

What is the difference between a homemade and factory vacuum table?

Working equipment created independently allows you to adapt the device to the needs of a specific production process. Do-it-yourself vacuum tables allow you to take into account all the nuances of processing parts related to their size, as well as include all functions - from milling to molding work. A vacuum table for a CNC machine, assembled independently, saves the user money and simplifies further maintenance of the device.

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Vacuum tables can significantly improve the efficiency of the production process and improve the quality of manufactured products. This is achieved by creating the powerful clamping force needed to achieve consistent quality. If the CNC machine does not come with a ready-made table, you can make it yourself. This is a simple process, and diagrams and drawings of devices can be found freely available on the Internet.

November 15, 2020
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