How to check a smooth launch of a corner grinder.

check, smooth, launch, corner, grinder

How to make and connect a speed control and smooth start to a corner grinder with your own hands

It is well known that not every tool is equipped with similar schemes of smooth start. They mainly go in expensive models of famous brands Bosch, Hilti, Dewalt. over, both in the network line and in the battery.

The power tool without such a device has a bunch of disadvantages:

Speaking of the anchor on the collector with the burnout of the lamella of the anchor

burning of brushes and faster they grind them

more often output the winding of the rotor and stator

Sixpan strikes against each other and their faster operation

Dangerous jerk when starting, tearing the tool from hands and increasing injury hazard

When working with a end saw having a PP, the disk will not be lost from the prepared cutting point

What is important for unprofessional joiners

If you still do not have electricity at the cottage or house at the initial stage of construction and you use the generator, then sooner or later you will understand that without BPP (smooth starting block) with sharp initial currents, the generator will not last long. Therefore, such a thing is able to save not only the tool, but also emergency power sources.

You can certainly independently integrate the BPP into the inside of the same corner grinding or end, however, to disassemble the equipment and poke around in the insides, not everyone is hunting.

Plus everything else, opening a new building entails a loss of warranty. Therefore, the best use for the KRRQD12A unit is an external connection.

Just keep in mind, it is suitable for collector engines. For asynchronous you need a frequency with other principles of regulation.

This box is designed for current 12 amperes.

What is characteristic, their dimensions are the same, and the difference in price is a couple of dozen.

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It would seem better to take it, but for a standard outlet in 16a, the first option is more profitable. There will be no desire to connect a more powerful load and thereby plow all the contacts.

Masters of self-made, of course, collect such schemes with their own hands, based on Tiristors VTA 12-600 or others, capacitors, dinistor and a couple of small resistors. Examples of schemes on the Internet can be found many.

Disadvantages of the power tool and service life

It is well known that not every tool is equipped with similar schemes of smooth start. They mainly go in expensive models of famous brands Bosch, Hilti, Dewalt. over, both in the network line and in the battery.

The power tool without such a device has a bunch of disadvantages:

    Sixpan strikes against each other and their faster operation

When working with a end saw having a PP, the disk will not be lost from the prepared cutting point. What is important for unprofessional joiners.

If you still do not have electricity at the cottage or house at the initial stage of construction and you use the generator, then sooner or later you will understand that without BPP (smooth starting block) with sharp initial currents, the generator will not last long. Therefore, such a thing is able to save not only the tool, but also emergency power sources.

You can certainly independently integrate the BPP into the inside of the same corner grinding or end, however, to disassemble the equipment and poke around in the insides, not everyone is hunting.

Plus everything else, opening a new building entails a loss of warranty. Therefore, the best use for the KRRQD12A unit is an external connection.

Just keep in mind, it is suitable for collector engines. For asynchronous you need a frequency with other principles of regulation.

This box is designed for current 12 amperes.

What is characteristic, their dimensions are the same, and the difference in price is a couple of dozen.

It would seem better to take it, but for a standard outlet in 16a, the first option is more profitable. There will be no desire to connect a more powerful load and thereby plow all the contacts.

Masters of self-made, of course, collect such schemes with their own hands, based on Tiristors VTA 12-600 or others, capacitors, dinistor and a couple of small resistors. Examples of schemes on the Internet can be found many.

But the ordinary user of the tool is much easier to buy all this in a ready.made compact case. You can order a similar block by link from here.

Diagnosis of the electric part angular grind

As mentioned above, most often the angular grinder refuses to work due to the breakdown of the electrical part of the unit. For the correct diagnosis of electrical circuits of the tool, the wizards for the repair of electrical equipment are used by a special device. a tester.

If you pressed the assembly button, and it does not work, then in 90% of cases the cause of the breakdown is not so serious that you cannot repair the angular grinder with your own hands.

Experts advise adhere to the basic rule of repairing power tools: move from simple to complex.

First of all, it will take a check of an electric cable and a fork at its end. If it is collapsible, then spin it and check the reliability of the contacts. Otherwise, you will have to disassemble the angular grinder (remove the casing of the device) and “call” the cable by the tester, and also make sure that the current is suitable for the “Start” button contacts. If the device shows a break, then the cable should be replaced with a new.

The situation when the current enters the button, but does not go further (when the position is turned on), indicates a malfunction of the switch. The button cannot be repaired. It must be replaced with a new one, but first march the contacts removed in order to connect them correctly in the future. When the contacts are incorrectly connected, the engine winding may burn out.

check, smooth, launch, corner, grinder

If when checking it turned out that both the cable and the start button are working, but the current does not enter the brushes, then it is necessary to clean the contact plates of the brush holders. In case of ineffectiveness of this procedure, it is recommended to replace the brushes. Further, if everything is fine with the brushes, and the current comes to them, you should check the rotor and the stator for the presence of circuits and cliffs.

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Checking the anchor of the electric motor

The electric motor rotor may have the following malfunctions: inter.seal circuits and wiring at the lamella contacts. You can check the anchor of the corner grinder with a multimeter: the device is converted into the mode of change in resistance, the value of 200 Ohms is set, and the resistance between two neighboring lamellases is measured using probes. Thus, it is required to check all pairs of lamellas. If the resistance indicators are the same, then the rotor winding has no damage. Detection of other resistance values ​​during the “rang”, as well as the identification of a chain cliff indicates a malfunction in this coil. In this case, it will require repair of the anchor of the corner grinder.

Typically, rupture rupture occurs in the joints with the winding. Inspect the places where the coils are connected to the lamellas, make sure the reliability of the contacts of the contacts.

If you do not have a measuring device, then you can check the rotor by using a 12 V light bulb for these purposes and the battery. Power should be in the range of 30-40 watts. The verification is done as follows: supply voltage 12 V from the battery to the corner grinder fork, connect the light bulb in the rupture of one wire, start rotating the corner grinder spindle. With a good winding, the light bulb will burn evenly, without blinking. With an interval circuit, the degree of intensity of a spiral of the bulb will change. In this case, the repair of the anchor of the corner grinder with your own hands will be difficult, since the winding scheme is quite complicated, and the process itself requires special equipment and knowledge. Therefore, this operation is recommended to entrust to specialists. But the best way out of the situation will be to replace the anchor on the corner grinding of a new.

If the bulb does not light up when testing the rotor, this indicates the presence of a cliff in the stature or closing in its windings, as well as problems with electrographs.

check, smooth, launch, corner, grinder

Checking the electric motor stator

To check the stator of the corner grinder, the multimeter is used, as in the previous case. Values ​​need to be set at 20-200 Ohms and make the following. Touch one probe to the contact of the stator winding, and the second. to the part of the part. If the device shows resistance, this means that a breakdown on the case occurred. Touch the probes to the contacts of one winding, and then to the contacts of another. If the resistance is the same, then the coils are serviceable. If on one winding the device shows a chain break, then it will require a rewinding of a stator or replacing a part with a new.

Rewind the stator at home, without special knowledge, skills and equipment, it will be problematic. It is better to contact specialists professionally engaged in engine rewinds.

Installation of a regulator on an angular grinder

Do.it.yourself revolutions control regulator can be mounted in four versions:

Installation of a regulator on an angular grinder. diagram

  • in the handle;
  • into the outer box, which is attached in a convenient place on the tool body;
  • into the cooling cavity (manufacturers use this particular option);
  • On the network cable.

Installation of an additional box does not require cutting the case for the output of the regulator, but the place should be chosen very meticulously so that the innovation does not interfere with convenient to keep the tool. Installation in the handle or cooling cavity will need to cut a hole for the output wheel, the main thing here is not to lose the rigidity of the protective casing and clean the edges well so that you do not hurt your hands when working.

Often the best option is the wire mount. In this case, the regulator is easy to test, you do not need to think about the place and method of fastening (island and the plastic case are quite suitable). If desired, it can always be removed and remade.

How to make a smooth start for power tools with your own hands

Smooth start has been widely used in a safe launch of electric motors. During the start of the engine, the nominal current (IN) is exceeded 7 times. As a result of this process, the operational period of the motor is reduced, namely the stator windings and a significant load on the bearings. It is because of this reason that it is recommended to make a smooth start for power tools with your own hands, where it is not provided.

General information

The stator of the electric motor is an inductance coil, therefore, there are resistance to the active and reactive component.

When the electric current flows through radio elements that resist with the active component, losses associated with the transformation of part of the power into the thermal type of energy occur. For example, the resistor and windings of the electric motor stator have resistance with the active component. It is not difficult to calculate active resistance, since the current phases of the current (I) and voltage (u) are coincided. Using the OMA Law for a chain site, you can calculate the active resistance: R = U/I. It depends on the material, cross.sectional area, length and its temperature.

If the current passes through the reactive type of elements (with capacitive and inductive characteristics), then, in this case, reactive R appears. The inductance coil that has no almost active resistance (when calculating, R of its windings is not taken into account). This type of R is created thanks to the electric motion force (EMF) of self.induction, which directly depends on the inductance and frequency of I, passing through its turns: XL = WL, where W is the angular frequency of alternating current (W = 2PIF, and F is the network current frequency) and l. inductance (l = n / rm, n. the number of turns and RM. magnetic resistance).

When the electric motor is turned on, 7 times more nominal (current consumed during the operation of the tool) and the stator windings are heated. If the stator coil is old, then an interval short circuit can occur, which will entail the failure of the power tool. To do this, use the device for a smooth start of the power tool.

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One of the methods for reducing the starting current (IP) is the switching of windings. For its implementation, 2 types of relay (time and load) and the presence of three contrasts are required.

Starting an electric motor with windings connected by the type “Zvezda” is possible only with 2 not at the same time closed contactors. After a certain time interval, which sets the time relay, one of the contributions is disconnected and another, not used earlier. Thanks to this alternation of the inclusion of windings and the starting current is reduced. This method has a significant disadvantage, since when two contrasts are at the same time, a current of KZ arises. However, when using this method, the windings continue to heat up.

Another way to reduce the starting current is the frequency regulation of the launch of the electric motor. The principle of this approach is the frequency change in the supply U. The main element of this type of smooth starting device is a frequency converter consisting of the following elements:

The rectifier is made of powerful diodes or thyristors, which acts as a converter U power supply into a constant pulsating current. The intermediate circuit smooths out a pulsating direct current at the output of the rectifier, which is assembled on a large capacity capacitors. The inverter is necessary for direct converting the signal at the output of the intermediate circuit into the amplitude signal and the frequency of the variable component. The electronic control scheme is needed to generate signals necessary to control the rectifier, inverter.

Operating principle

During the launch of the collector type electric motor, a significant short.term increase in consumption current occurs, which causes the premature failure of the power tool and the delivery of it for repair. Wear of the electrical parts (current exceeding 7 times) and mechanical (sharp launch). For the organization of “soft” starting, you should use smooth starting devices (hereinafter referred to as UPP). These devices must meet the basic requirements:

  • A smooth increase in load.
  • The ability to start the engine at certain time intervals.
  • Providing protection against linear jumps U, phase loss (for a 3-phase electric motor) and various interference of the electrical component.
  • Significantly increasing life.

The most widespread is the Simistor SCP, the principle of action of which is smooth control U by adjusting the angle of opening the transition of the systemist. Simistor needs to be connected directly to the engine windings and this allows you to reduce the starting current from 2 to 5 times (depending on the simistor and the control circuit). To the main disadvantages of the Simistor SCP are the following:

  • Complex schemes.
  • Overheating of windings with prolonged launch.
  • Problems with the launch of the engine (leads to a significant heating of stator windings).

The schemes are complicated when using powerful engines, however, with low loads and idle, it is possible to use simple schemes.

Do.it.yourself angular grinder.

You have a corner grinder, but there is no speed controller? You can make it with your own hands.

Revolutions control and a smooth start for angular grinder

Both are necessary for the reliable and convenient operation of the power tool.

What is a revolution regulator and why it is needed

This device is designed to control the power of the electric motor. With it, you can adjust the speed of rotation of the shaft. The numbers on the adjusting wheel mean a change in the speed of the disk.

The regulator is not installed on all corner grinders.

Corner grinder with a revolution regulator: examples in the photo

The lack of a regulator greatly limits the use of a grinding machine. The speed of rotation of the disk affects the quality of the operation of the corner grinder and depends on the thickness and hardness of the processed material.

If the speed is not regulated, then the turns are constantly kept at the maximum. This mode is suitable only for solid and thick materials, such as a corner, pipe or profile. The reasons why the presence of a regulator is necessary:

  • For thin metal or soft wood, you need lower rotation speed. Otherwise, the edge of the metal will melt, the working surface of the disk will be blurred, and the tree will turn black from high temperature.
  • For cutting minerals, it is necessary to adjust the speed. Most of them at high speed break off small pieces and the place of cuts becomes uneven.
  • The highest speed is not needed for polishing cars, otherwise the paintwork will deteriorate.
  • To change the disk from a smaller diameter to a larger one, it is necessary to reduce speed. It is almost impossible to hold your hands with a corner grinder with a large disk rotating at a huge speed.
  • Diamond discs cannot be overheated so as not to spoil the surface. The speed is reduced for this.

Why do you need a smooth start

The presence of such a start is a very important point. When the powerful power tool connected to the network is launched, the starting current is thrown, which is many times higher than the rated current of the engine, the voltage in the network sags. Although this throw is short.term, it causes increased wear of the brushes, the engine collector and all the elements of the tool according to which it proceeds. This can cause the failure of the tool itself, especially Chinese, with unreliable windings, which can burn at the most inopportune moment during the inclusion. And there is also a large mechanical jerk when starting, which leads to rapid wear of the gearbox. Such a start extends the life of the power tool and increases the level of comfort during operation.

Electronic block into corner grinder

The electronic unit allows you to combine the speed control and smooth start into one whole. The electronic circuit is implemented according to the principle of impulse. phase control with a gradual increase in the phase of the opening of the systemist. Such a block can be supplied with corner grinders of different capacities and price category.

Do.it.yourself revolutions

The revolution regulator is not installed in all models of the Bulgarians. You can make a block for adjusting revolutions with your own hands or purchase a ready.made.

Factory regulators of the revolutions of the Bulgarians: photo examples

Such regulators have a simple electronic circuit. Therefore, creating an analogue with your own hands will not be difficult. Consider what the speed control for Bulgarians is assembled from up to 3 kW.

Production of printed circuit board

Since the circuit is very simple, there is no point in installing one to install a computer program for processing electric circuits. Especially since printing needs special paper. And not everyone has a laser printer. Therefore, let’s go the easiest way to make a printed circuit board.

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Take a piece of textolite. Cut the necessary size for the chip. Roll the surface and degrease. Take a laser disc marker and draw a scheme on a textolite. In order not to make a mistake, first draw with a pencil. Next, proceed to etching. You can buy chlorine iron, but after it the sink is poorly washed. If you accidentally drop the clothes, there will remain spots that cannot be removed to the end. Therefore, we will use a safe and cheap method. Prepare a plastic container for the solution. Pour in hydrogen peroxide 100 ml. Add the floor of a tablespoon of salt and a bag of citric acid up to 50 g. The solution is made without water. With proportions, you can experiment. And always make a fresh solution. Copper should be scattered. It takes about an hour. Wash the board under a stream of deck water. Drill holes.

You can make it even easier. Draw a scheme on paper. Glue it with tape to the cut textolite and drill holes. And only after that to draw a scheme with a marker on the board and poison it.

Wipe the alcohol board with a rosin flus or a conventional solution of rosin in isopropyl alcohol. Take a little solder and tire the tracks.

Installation of electronic components (with photo)

Prepare everything that will come in handy for the installation of the board:

Bite off four pins and solder them into a fee. Then install the dinistor and all other details, except for a variable resistor. Sold the Simistor last. Take the needle and brush. Clean the gaps between the tracks to remove the possible circuit. The simistor with a free end with a hole is attached to an aluminum radiator for cooling. Shallow with fine sandpaper, clean the area of ​​the element fastening area. Take the thermal conductive paste of the KPT-8 brand and apply a small amount of pasta to the radiator. Fasten the Simistor with a screw and a nut. Since all the details of our design are under voltage of the network, we will use the handle from insulating material to adjust. Put it on a variable resistor. Combine the extreme and medium terminals of the resistor with a piece of wire. Now solder two wires to extreme conclusions. Save the opposite ends of the wires to the corresponding conclusions on the board.

You can do all the installation with hinged. To do this, we solder the details of the microcircuit to each other directly using the legs of the elements and wires themselves. Here you also need a radiator for the simistor. It can be made from a small piece of aluminum. Such a regulator will take up very little space and it can be placed in the corner of the corner grinder.

If you want to install an LED indicator in a speed control regulator, then use another scheme.

Checking the performance of the stator

How to hang out the stator angular grinding machines by improvised means:

  • The stator usually has several fundamental malfunctions. this is a break in the conductor or the occurrence of short.closed turns. With all this, the testing tester in the resistance measurement mode of up to 200 Ohms is able to show only the absence of cliffs with the average resistance indicators, which should not differ between phase windings.
  • The absence of cliffs in the stator windings can be found with each low.voltage probe: a couple of wires, a battery, a light bulb. But, the presence of a short.term short circuit in the chain cannot be found specifically, thanks to this, qualified electricians are accepted experimentally: voltage is supplied to phase reels, while in the very center between the poles of the windings it lies with a ball of metal, which, with ordinary windings, will “look for” an electric balance point. The rotation of the ball reads the absence of a short circuit in the reels, the displacement from the center is the closure in the guides on the side located opposite.

Attentionsuch a method is dangerous due to the introduction of the highest voltage and unpredictable movement of the iron ball.

Replacing graphite brushes

The failure of the graphite brushes is one of the most common breakdowns of corner grinder.

The service life of this element of the tool design is about 1.5-2 years. The process of replacing brushes is not particularly difficult. To replace these structural elements, you need to open the tool body. After opening the housing, the screwdriver lifts and shift the brush holders, which are fixed on the collector.

The replacement of brushes should only be made on branded, purchased in special stores. When acquiring a new brush, it should be compared with the original, which is extracted from the tool. The new brush should fully, in all parameters, coincide with the extracted from the corner grinder. After installing new brushes, you should check the smoothness of its movement.

After installing and checking the smoothness of the brush movement, it is fixed using a brush holder. After fixing the brush holder, the tool body closes.

Replacing brushes is the only operation that during the repair should be carried out on their own, the remaining types of repairs should be entrusted to specialists.

Prevention of angular grinder breakdown

The service life of a grinding machine directly depends on the departure of the owner for it. Each tool needs good care, then it will work regularly for a long time.

Any corner grinder will heat up during work, but in order to postpone the corner grinder for a long time, it is necessary to adhere to some rules in the work:

How to drive a manual car SMOOTHLY. Driving stick without the kick.

  • Do not overload the tool to avoid overheating and smoke.
  • Do not put pressure on it during work.
  • Clean and lubricate the necessary parts inside the case in time.
  • With noticeable improper work, stop the operation and conduct an inspection for the presence of problems.
  • Replace fast.intelligent parts in a timely manner.
  • If the corner grinder smokes, urgently stop working and no longer turn on.
  • Do not use the tool when processing wood.type material.
  • Hold the corner grinder tightly in the process of work, so as not to drop and not damage.

Adhering to the listed simple recommendations and rules in working with a tool called an angular grinder, it is possible to extend its period of work longer than a warranty period.

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