Where do the sparks from the angle grinder fly?

The principle of operation of the “angle grinder

sparks, angle, grinder

What this machine is, firstly, the main working part is a disk. Sawing and grinding discs are different depending on the material with which you need to work. The very process of operation of an angle grinder, this is the movement of the nozzle disc at high speed, the disc has serrations, so you can cut the necessary material, and in a situation of violation of safety precautions, get wounds and cuts.

Safety engineering

Violation and non-observance of safety measures will lead to serious injury. Therefore, before starting work, you must carefully study the instructions, remember and follow.
It is a violation of safety precautions to work without protection and to saw on yourself. It’s just beyond comprehension. The stand should be the correct legs bent at the knees, the angle grinder slightly to the side.

An angle grinder is a work tool that can be dangerous. The unit must be positioned towards you, with the heel. The head should never be on the mowing line of the cut. And in this regard, it is correct to cut sparks from oneself or under a person, that is, into the legs, because:

  • You can see where the sparks fly,
  • The likelihood of catching a lawsuit or sawdust in the eye is reduced, even when working with glasses, it can fly.
  • When the disk is scattered (this happens), the fragments go away from themselves, and not onto a person.

Which way should the sparks fly from the angle grinder

“Angle grinder”, as the craftsmen have long nicknamed the tool designed for cutting and grinding metals, stones and other materials, the angle grinder. The use of this tool is quite common both in construction and in agriculture and at home, for various kinds of domestic machinations. The machine received this name from the country of the manufacturer, as it is not difficult to guess the angle grinder.

Recently, the question “In which direction should the sparks fly from the angle grinder” has caused a real stir. And the fact is that people answer in different ways, and referring to their own personal experience. But if we talk not about experience, but about how to do it right. Then you need to carefully study safety and operating technology.

Work technology

The direction in which the sparks fly depends on how familiar a person is with the technology of working with an angle grinder.

  • The first is the grip. You need to hold the unit firmly with both hands, without transferring the weight to any one hand. In a kickback situation, with the correct grip, there will be no pulling out of the hands.
  • The line should be laid out to the side away from the rotating disc, but not next to or on the mowing line of the cut.
  • The direction of the sparks can be chosen both away from the master, and under him. the main thing is not on yourself. However, left-handers do not have to choose, the only possible option is the direction of sparks “for themselves”.
  • When working with an angle grinder, there should be a bucket of water nearby as a precaution against fire.
  • The tool cannot be put off anywhere while the disc is rotating. Naturally, when moving from one place to another in operation, the angle grinder must be turned off.

The conclusion of the direction of the sparks from the angle grinder depends on the master, to choose from either himself or for himself.

And how you saw, where the sparks fly?

ANCHOR angle grinder

Name SKU Price Small picture Description Refresh
ANCHOR angle grinder BOSCH GWS 10-125, 7-125, 8-125 YB-67 180.00
ANCHOR angle grinder ARSENAL 125 (970W) YB-93 175.00
ANCHOR angle grinder PARMA 2 M YS-17 420.00
ANCHOR angle grinder BOSCH 23-230 (L = 220 mm) YB-71 490.00
ANCHOR angle grinder BOSCH GWS 14-125 CE (Bosch GWS 14-125 CE) d8 koro YB-69 210.00
ANCHOR angle grinder BOSCH GWS 14-125 CIE (Bosch GWS 14-125 CIE) YB-68 220.00
ANCHOR angle grinder BOSCH GWS 20-230 YB-70 450.00
ANCHOR angle grinder BOSCH GWS 6-115 (Bosch GWS 6-115) d8, L153 YB-95 170.00
ANCHOR angle grinder CRAFT CAG-125 Yak-61 150.00
ANCHOR angle grinder CRAFT CAG-180/1600 Yak-1 240.00
ANCHOR angle grinder CRAFT CAG-180/1900 Yak-9 240.00
ANCHOR angle grinder DeWalt 125 (for thread) YB-94 320.00
ANCHOR angle grinder DWT 125 SL Yak-24 190.00
ANCHOR angle grinder DWT 125 SS YB-36 130.00
ANCHOR angle grinder DWT 150-SL YB-38 240.00
ANCHOR angle grinder DWT 180 Yak-41 240.00
ANCHOR angle grinder DWT 180 DL Yak-44 260.00
ANCHOR angle grinder DWT 230 DL Yak-42 350.00
ANCHOR angle grinder DWT WS-125L / LV 08-125T Yak-40 170.00
ANCHOR angle grinder DWT WS-230SL Yak-38 450.00
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Buy anchor for an angle grinder

To check the angle grinder for a malfunction, you need to disassemble it. And we start by extracting the anchor. Be sure to release the brushes before removing the anchor. We take a small screwdriver and pull them up a little so that they detach from the collector lamellas. Next, unscrew the bolts that secure the gearbox housing, and carefully take out the anchor.

In the next step, we disassemble the angle grinder gearbox. First of all, we unscrew the bolts that secure the gearbox flange, and easily remove it. There will be a gasket under the flange. Remember to put it back on when reassembling. Otherwise, the distance between the large gear and the small gear will not be respected. This will lead to rapid wear of not only the conical pair, but also the armature itself, because the load will increase. To disconnect the armature from the gearbox, you need to unscrew the nut or remove the retaining ring (with a special puller) that secures the small gear to the anchor. It often happens that the armature shaft is very tight and is pinched in the bearing. In this case, insert a screwdriver or a pry bar between the seat for the gearbox shaft and the end of the armature, and remove the anchor using the extrusion method.

After buying and installing an anchor for people who are just starting to use angle grinders, the question often arises of how convenient it is to adjust it to their hand. There are two main customization options at hand. First. this is the direction of rotation of the disk (the question is where it is convenient for you so that sparks fly from the disk towards you or away from you). For example: when cutting metal, this is not very important. But when cutting stones or tiles, it is advisable to adjust all the same so that the dust flew from the angle grinder. And the second point. this is the position of the hand itself (right or left). In some angle grinders, in order to turn the gearbox, you need to free the brushes, pull the gearbox itself out of the housing a little and turn it where we need to. Probably everyone has come across a situation where an angle grinder jammed the disc. Some resort to rather serious measures, namely, they put a wedge in the hole in the nut, beat with a hammer and grind the washer. Others very often break the button that secures the disc. But there is a simple solution to this problem. You just need to cut off a ring from the bottom of the plastic bottle cap. Slide it onto the shaft after the disc and tighten with a nut. You will get a good gasket that will not allow the nut to jam.

You can order a rotor for an angle grinder on the website or by phone numbers indicated in the contacts.

Modified: Tuesday, 23 February 2021 10:33

Grinder Safety.- and lies you are told to scare you.

Features of floor grinding

Another area where you may need to use an angle grinder is when you need to sand floors made of concrete. Now this process is becoming more popular, because it gives the floor covering a spectacular and pleasant appearance. Grinding concrete flooring using an angle grinder will be one of the types of processing that is needed in certain cases to remove the old coating and level the base, so that you can make a screed before applying various impregnations, paints, and so on.

The preliminary sanding procedure should be carried out 3-5 days after casting the base. And the final sanding should be carried out after the final hardening of the floor surface. With the help of the process under consideration, it is possible to remove all kinds of contamination, level out areas that have undergone deformation or in which there are cracks, sagging or chips. And after sanding, the concrete floor will look fresher and has increased adhesion characteristics.

For grinding concrete, an average angle grinder with a disc diameter of 16-18 centimeters and a power of about 1400 watts will do. To get a good result, you should not rush to get the job done. Usually, the best filler for grinding will be rock crushed stone of the metamorphic type or fine-grained.

If there are any coatings on the concrete, they must be dismantled in order to level the entire plane. If there are shrinkage joints or cracks, then they need to be repaired, and then additionally sanded. Before starting work, you need to make sure that there is no reinforcement in the top layer or that there is a metal-type mesh with reinforcing functions.

Grinding concrete should only be carried out 14 days after final screed drying. During this period, the material is gaining strength. After preparation, grinding can be carried out. First, the floor should be treated with a special mixture that reacts with calcium hydroxide. For this reason, a binder-type substance on a mineral basis will appear on the surface of the material, which closes the pores and increases its strength and moisture resistance.

When using discs that have a grain size of about 400 and more, it is easy to form a fairly strong layer of concrete, which will withstand quite serious loads. This is the final stage of work, after which the surface no longer needs to be processed. If you want, you can only polish it using large grit diamonds.

READ  Got In The Eye From An Angle Grinder What To Do

How to cut ceramic tiles?

If we talk about cutting ceramic tiles or there is a need to cut porcelain stoneware, this can be done using a disc made of steel and having a fine-grained diamond coating. Another similar option is called dry cutting. Such disks can be solid and segmented. Home use of such solutions allows cutting ceramic tiles without refrigerants within 1-1.5 minutes. Then the disc should be allowed to cool down by idling. If we talk about a solid disc, then it perfectly cuts ceramic tiles for sidewalks.

How to cut a balloon?

Many of us are faced with the presence of an empty gas cylinder of either oxygen or propane. Most people will throw it away, although you can create a lot of useful things out of it. But in this case, it will not be possible to do without cutting the metal. These instructions are generally suitable for any cylinder, be it gas, propane, oxygen or something else. First, you should prepare a number of materials and devices, namely:

  • angle grinder with cutting disc;
  • compressor;
  • hacksaw for metal;
  • pump;
  • watering hose;
  • construction funnel;
  • directly used cylinder.

So, if you have everything you need at hand, then you can begin to perform the work in question. First, it is necessary to release the remaining gas from the cylinder. It is necessary to move the valve to the open position as far as it will go and make sure that there are no gas residues inside the container. If there are no sounds, then you can soap the outlet hole of the valve and in the absence of bubbles it will be clear that the inside is empty.

We put the cylinder on its side to make it easier to saw it. First, we saw off the valve. We take a hacksaw and saw the brass part as close as possible to the place where it is docked with the main container. There will be no extra help from someone so that while you are cutting, another person poured water onto the cutting place so that sparks do not start flying. The container should now be filled with water using a funnel. As it fills, the container should be shaken so that the remaining condensate disappears from the walls. Water should be poured to the very top, after which everything must be poured out. It is better to do this in places where there are no living quarters, since the remnants of some gases have a very strong unpleasant odor.

Now we proceed to the actual sawing of the container. We already need an angle grinder. The thickness of the metal in the cylinder usually does not exceed four millimeters, because of it, with the help of an angle grinder, it can be dealt with in 15-20 minutes. To cut safely, you should not wait for the inner surface of the cylinder to dry, but immediately start sawing the cylinder while it is wet. The water on the walls will serve as a lubricant for the disc.

How to work an angle grinder correctly?

  • How to cut a tree?
  • How to cut ceramic tiles?
  • Working with metal
  • Glass cutting
  • Working with artificial and natural stones
  • How to cut a balloon?
  • How to sharpen a chainsaw chain?
  • Features of floor grinding
  • Safety engineering

Every man’s house should always have various kinds of tools that will allow you to quickly and easily fix something in the house. These include a hammer, nails, a hacksaw, and more. One of the items is an angle grinder, which in the common people has long been called an angle grinder. Its main purpose is grinding and polishing various surfaces and materials. But in order for these processes to be as effective as possible, you should know how to work an angle grinder correctly.

How to cut a tree?

To begin with, it often happens that there is a need to cut planks or trim a piece of wood. For such work, there are special discs of one type. This disc is a solution with side teeth that increase the kerf. It should be used very carefully when it comes to sawing boards with a thickness of no more than 40 millimeters or to make descents on the knife. In no case should you use circular discs, due to the fact that they are designed to work at speeds of no more than 3 thousand revolutions.

And with an angle grinder, the operating speed is significantly higher. Yes, and disks from it are usually created, although from hard steel, but it is extremely fragile and usually immediately collapses when jammed.

Working with artificial and natural stones

A number of categories of stones, including marble, concrete, granite and others, have high strength. Even the most powerful angle grinder cannot cope with these in all cases. Use special cutting tools to cut stones. We are talking about cut-off options with diamond sputtering, which were already mentioned earlier. It is based on a high-strength steel plate, on the outside of which certain segments are located. The toothed ends of the segments are coated with high strength diamond crumbs. During operation, such circles encounter strong heating, which is why there are special slots for cooling, which are called perforations. During twisting, cold air passes through the slots into the cutting area, which cools the material being worked with and the blade. With diamond options, it is easy to cut the strongest finishing stones with a natural base:

  • granite;
  • flagstone;
  • marble.

But artificial solutions are also well cut by this method. As with the same concrete, its age will be very important, since the older it is, the stronger it is usually. It also matters what kind of filler was used to create the material. In general, concrete can only be handled by a powerful, truly professional angle grinder, which has diamond-based abrasive discs and the ability to switch speeds. Let’s say that today there are only two methods for cutting stones of natural and artificial origin:

  • dry;
  • wet.

In the first case, a large amount of dust is formed. In the second case, there will be a lot of dirt. Preference should be given to one method or another depending on the amount of work. If we are talking about some one-time work, then you can easily get by with the dry option. If there is much more work, then you should resort to the second option. In addition, the use of water reduces dust formation, improves cutting conditions and reduces wear on the diamond blade.

Glass cutting

Before you start cutting glass, you should understand the characteristics of such a transparent and seemingly fragile material. Glass has quite good strength characteristics, although it may seem, at first glance, that this is not the case. It has not only good strength, but also hardness, heat resistance, and good optical properties. Cutting a glass bottle at home just won’t work. You must have a certain tool and certain conditions.

It should be said that glass with an angle grinder can only be sawed. And this can be done quickly. But for this, you should have a disc made of steel, equipped with diamond spraying for cutting concrete, granite or other building materials. When cutting, the cutting area should be constantly watered with cool water. Given the high strength of the glass, there will be a lot of heat at the cutting site. High temperatures will have a negative effect on the cut edges and blade. And thanks to the cooling, the cut will be smoother and the diamond dusting will not quickly wear off. This method allows you to work with almost any kind of glass for household use.

Working with metal

Metal is the material for which the instrument was originally designed. Using an angle grinder, you can easily cut rail, fittings, cast iron, various metals. You can also cut the tube straight off without any problem. It should be said that metal cutting requires maximum attention and care. In addition, special discs made of hard wire are required to clean the surface from scale or rust. If you have to work with this material, then you should follow a number of rules.

  • In work, it is necessary to pause every 5-7 minutes of cutting. This will be especially important for a household instrument, which is not suitable for particularly strenuous work. And the durability of the device and disks will greatly depend on this.
  • The workpieces should be fixed as securely as possible using clamps or a vice.
  • When cutting thick metal, it is best to cool it down. This can be done by pouring cold water.
  • If you are cutting aluminum, then in order to reduce friction and the disc is better cooled, you can drop a little kerosene into the cut. But here you should be careful in terms of fire safety.

When working with metal, the main attention should be paid to the cutting disc. Care must be taken so that it is not pinched by the edges of the metal workpiece. It will be best if the piece that is being cut will seem to hang in the air. We are talking about cases when work is carried out with materials such as pipe, angle, round timber, fittings, and so on. It will also not be superfluous to note that cutting metal profiles. various rails, corners should not be carried out at one time, but cut each separate part.

In workpieces that are thick, all cuts should usually be straight. If there is a need to make a certain contour of a curvilinear type, then you should first make segment rectilinear through cuts and remove unnecessary parts. When working with metal, do not press too hard on the device. Too much force can cause breakage.

Safe Operation Angle Grinder

(There will be trouble). I will not insist on being right, BUT I WILL NEVER HOLD ON ANOTHER, N AND K O G D A.

lamplighter: Place the disc correctly.

Kremlin paws: Whoever says that sparks do not burn in the “away” position, let them try to saw off the stuck bolt under the bottom of the car. Or, try to imagine that you, a small angle grinder, saw a part. with one hand. In which case it will be safer for you: sparks on yourself or vice versa?

Alexey Salo: The crest should not use the Russian angle grinder.

Andrey Porokhnya: And if the disk breaks, it will fly at you, everything is simple

Sergey Ryabchikov: First you need to install the disc correctly. Printing should not be outward.

Correct disc rotation angle grinder

Usually the disc rotates counterclockwise (when viewed from the side of the disc), sparks fly forward, but recently, in a pipe warehouse, I saw that the cutter’s disc rotates in the opposite direction, sparks fly under the feet. He has to cut a lot and every day. Therefore, the question arose. how is it right?

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Correctly for safety, when sparks fly to the worker working with an angle grinder, to his feet. Why? When clamping the angle grinder, it flies forward. Without causing harm. (Sparks fly, pants burn. it doesn’t count). When rolled over, sparks fly forward. Usually when cutting, the right elbow rests on the right shin. And when clamped, the angle grinder flies over the lower leg. It’s better not to describe the consequences, I think it’s clear. Minimum hospital month. The bulk of professionals cut their pants.

That’s right and right (as you saw). when the sparks fly to the cutter, and the centrifugal pulling force “carries away” the angle grinder away from the cutter, and not on it. What you saw, the sparks flying on the cutter, is the correct choice of setting the position of the angle grinder, and precisely setting the body, handle and cover, because the direction of rotation of the shaft does not change. You can swap the handle in places (depending on the model of the angle grinder, it can be set in three or two positions 180 degrees and 180 degrees in increments of 90) You can rotate the casing within the range of its adjustment. But not all angle grinders allow you to “twist” the casing as you like. For some, the position of the gearbox can also be changed.

Angle grinder (in common parlance “angle grinder”) is a rather dangerous tool, although very effective in many locksmith operations.

Having experience robots with all running angle grinders, from 115 to 230 (this is the diameter of the circle, and, accordingly, the power of the unit), I can say that devices up to the 150th disc can still be confidently held, as in the case of not predictable “recoil” then above this diameter, it is very difficult, and is fraught with serious injuries (!) That is why you should not tempt fate, and regardless of the power of the unit, and the diameter of the disc, always direct its rotation away from you (if you look at its upper part) and let the sparks fly at your feet, but this is a 100% guarantee that you will hold the angle grinder in case of a snack and throw.

Again, from personal experience, I can conclude that the arm muscles are much more difficult to reflexively react to extension than to flexion (IMHO!) “Pulling” the cutter is less dangerous than rolling on it. As a last resort, the angle grinder will simply jump out of your hands, rushing away from you and not at you. Of course, you release the latch and it will just fall without hurting you.

Well, let the sparks fly, just always saw at yourself. That’s why you need a good suit (pants and a suit made of thick fabric). From the sparks flying, you can burn your pants (all that is not scary) but from an angle grinder that flew at you. maybe anything!

I came to this conviction solely on my own experience, and this experience was not without some “losses”. However, it is also confirmed by others.

I have a small DWT angle grinder, the standard disc is on the right, rotates counterclockwise, sparks fly forward. But it is absolutely inconvenient for me to work this way, since I see neither the product nor the circle.

I turned the gearbox over so that the disc was visible, but the sparks fly at me. it’s not pleasant. The question is, is it possible to somehow make the disc rotate clockwise? Change the wires from the brushes? And another question is how safe it is. In principle, the discs are light, they will not cause serious injuries, except that they will knock out the eyes, if without glasses.

Direction of rotation of the disc angle grinder

Direction of rotation of the disc angle grinder

I have been repairing power tools for eight years, during which time I have heard so many terrible first-hand stories from the owners that God forbid. Including about pieces of a disk in the neck. The last example: a man does not take his instrument out of repair for a long time, several months, when I call him on the phone, I don’t fucking understand what he’s saying. Finally it appears: there is no voice, there is a terrible scar on the neck. An angle grinder worked without protection, then everything is clear. Saved by the fact that he worked in the immediate vicinity of the regional hospital, did not have time to bleed, everything was sewn up, but damaged the ligaments forever.

The disc is placed the way someone’s hands are sharpened.

Video on this topic


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Safety when working with an angle grinder

Safety when working with an angle grinder is an extremely important component when working with this tool. Of course, any tool requires careful attention, be it a jigsaw, hammer drill or screwdriver.

However, an angle grinder, or, as it is “scientifically” called, an angle grinder (angle grinder), requires this attitude doubly. Why ?

The angle grinder is the most traumatic power tool. The disk, mounted on the spindle, rotates at a speed of up to 13 thousand revolutions per minute. Circular blade protection, as, for example, with a circular saw, does not have a cut-off machine. If the disc is skewed, the tool can pull out of the hand, and the bounce path is impossible to predict. The circle can break into fragments, which scatter at speeds up to 360 km / h. long distances. All of these factors make the angle grinder perhaps the most dangerous handheld power tool.

Why does it rip discs and how to avoid it? Sometimes, as mentioned above, the abrasive disc breaks into pieces during operation. As a rule, this happens so quickly that the worker notices the gap only after it has already occurred. over, the disc can rip off the spindle entirely (the middle breaks out), and it, like a flying saucer, rushes up !

Why this happens and how to avoid ruptured discs on angle grinders ?

A skewed blade in the cut is one of the most common causes of ripping blades. Most often, the worker himself inadvertently skews the tool, or clamps the disc in the metal (this can happen if you saw in the direction opposite to the direction of rotation, as well as if you cut for squeezing instead of breaking).

Unjustifiably long-term operation. In fact, discs for an angle grinder do not cost much, but some, in order to save a penny, work with them until there is practically one spindle left. In such cases, the discs also break.

Improper use. Grinding with cut-off wheels leads to their rapid thinning, as a result of which the strength of the bond is lost and the wheel is torn apart. Below you can see such a thinned circle:

Angle Grinder Sparks

Factory or acquired defect. chip, crack or break. In the process of work, the circles experience serious overloads, and in addition they noticeably heat up. Chips and cracks slowly creep to the sides and “spread” the disc. Therefore, it is strictly prohibited to work with such products.

Is it worth cutting an angle grinder a tree ?

Some “craftsmen” set it to 22 mm. discs for circular saws adapter flanges, so that it is possible to put such a disc on the spindle of an angle grinder, and then they begin to saw different pieces of wood.

So, if in the process of sawing at least a small knot or other non-uniform area accidentally comes across, then the tool can be pulled out of the hands, and it will fly to no one knows where. For example, in you. By the way, the disk does not stop rotating at a speed of 6-13 thousand revolutions per minute. Or the engine may still burn out, especially with a cheap angle grinder.

Dangers when sawing openings and grooving

When making cuts in concrete walls, reinforcement can get into the area of ​​such a cut. If the blade is diamond, the angle grinder may break out of your hands. If the disc is abrasive, then it can break, and reinforcement particles can, heating up to 500 ° C, fly out of the cut zone directly at you at great speeds.

Before driving in concrete, it is recommended to check the cutting area with a metal detector, if any. Also, unknown hidden wiring with current-carrying wires, as well as smeared junction boxes and old grooves, carry great dangers. Such things should also be excluded by ringing the walls with a non-contact probe or an electromagnetic radiation detector.

Dangers from improper use of discs

If you cut tiles or granite ceramics with a disc for metal work, then part of the material will curl with shavings, which can fly in any direction at high speed. By the way, the temperature of such chips can reach 600 ° C or even more (literally “white heat”).

A similar situation will happen if you cut tiles at 11 thousand rpm (you need no more than 3 thousand revolutions to cut tiles). Sawing iron with a diamond blade on concrete can cause the angle grinder to tear out of your hands. Cutting aluminum with a disc over steel will damage this disc, and possibly damage the workpiece with the scattering of large torn chips. Etc.

Comprehensive security measures

Change circles and make any adjustments only with the plug disconnected. Until the plug is unplugged, nothing like this can be done. !

It is strongly recommended not to use the switch lock. this way the control over the rotation of the disc and in general over the instrument is maintained better.

Never operate the angle grinder with greasy or slippery handles. They should be thoroughly cleaned of such contamination by 100% before work.

Sparks from the angle grinder are hot and may cause a fire. Therefore, there should be no flammable materials in the cutting area. The fact is that some “construction gurus” claim that they (sparks) are supposedly cold.

Which way should the “angle grinder” disc rotate??

The disc on the left and, accordingly, the rotation towards oneself is a consequence of the fact that during work instinctively put the right hand forward, holding the gear knob with it. The same goes for shoveling. The one who holds the shovel is how the angle grinder works. Although with an effort of will, you can force yourself to change your hand. Because I work with my left hand forward (disc to the right, rotation away from myself), then, of course, I think this option is the only correct one: rolleyes :. Pros:

The sparks fly away without harming me or the angle grinder. When they work with sparks on themselves, they are sucked into the engine by the fan and over time all the windings begin to blush with pure uninsulated copper, as if someone rubbed it with sandpaper on purpose.

When biting, the angle grinder jumps out of the cut straight into my hands. You just have to always remember that you have a car with a power of several horsepower in your hands and hold these animals with a firm hand. According to the working conditions, of course, you have to turn the angle grinder, if you don’t get close to it in another way, but I always return to the usual option.

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When working with an angle grinder, I try to avoid deep cuts. It is better to cut the corner in two steps, cut the shelves in turn. I cut the channel in three steps, first the core then the shelves. thus avoiding accidental pinching of the tool. A cut in thick metal sometimes has to be cut, deliberately widened by cutting in two steps, especially if the cutting zone is inconvenient and unintentional skewing of the disc is possible.
I outline the cutting line in thick metal immediately and cut it by 5-7 mm, cutting the edges of the cut. when cutting, avoid cutting with a package; displacement of the stack is fraught with skewing of the lower layers. Two elements of spatial structures should not be cut when the disk cuts two elements spaced apart from each other at the same time; with a thin disk, the cuts of the comut turn out to be non-parallel (not coaxial).

The disk rotates around a fixed axis according to the law.

Determine the angular velocity, angular acceleration and rotational speed of the disk at time t = 2 s.

Uneven body rotation set.

Body angular velocity


At time t = 2 s

glad / s.

Angular acceleration of the body


At time t = 2 s

rad / s 2.

Since ω 0, ε 0, then the accelerated rotation.

Disk rotation frequency at t = 2 s


Date of publication: 2015-10-09; Read: 118 | Page copyright infringement

studopedia.org. Studopedia.Org. 2014-2018. (0.001 s).

In other words, how to “set up” an angle grinder correctly so that you can work with it simply, conveniently and safely!

Mansur Fattakhov: On “Interskol” the handle with the switch is turned over.

Mansur Fattakhov: The handle with the button did not turn over.

TORKA Donetsk: Where the sparks fly.

There are the fragments of the circle.

Vadim Rostov: It turns out somehow strange, if the power button is under your fingers (which is quite logical), then sparks fly away from you. If the sparks are on themselves, then the power button looks up (into the palm). And then how to turn it on? The conclusion is obvious. sparks only from yourself!

Let the enemies rot in Navi !: at

Tsar of All Russia: sparks on itself, and when the disc scatters, it will also fly into fucking. Correctly sparks from yourself, and in order to make it convenient to saw and hold the angle grinder, the handle must be held with the left hand with another grip, and not as the author of the video shows

Rostislav Vodovrzov: Safely. When sparks, and with them the flying disc flies into your e @ alo, torso and legs. If you are nauseous and cannot hold a 230 angle grinder in your hands in case of a snack ……… On @ ya you take it, ram, take it. You blah, “sparks on yourself” as if the sectarians are three-fingered and earless.

Nikolay Novikov: I must add that when cutting from yourself.

Igor 79: If the head is with brains, it doesn’t matter where the sparks fly!

Nikolay Yurassow: This is for lefties only

Alexander Kruglov.: From the factory, everything was correct and the protective fence and the power button on the handle. At the beginning of the second minute, everything was turned inside out. Now you have to twist your hands as well.

Murat Balaev: why did they hang two Serbs, right above the work table, what do you use with them every day and why it is necessary to install a cutting wheel in an angle grinder, drawing from yourself?

PROvincial: sparks only along the body of the angle grinder AND THIS IS NOT DISCUSSED

Natalya Yurievna: The “angle grinder” worked for 30 years, in the nineties DAILY, later much less often, THIS WAY I CHOSE AND I. I tried both methods, there was no Internet yet, so I began to explore the WAY. With small bites on the disc, it is more difficult to hold the tool, and if it Bites WELL?

How to cut an angle grinder correctly: by yourself or by yourself?

To such “craftsmen” I would recommend to substitute your own hand for half a minute under the sheaf of sparks from the angle grinder. I assure you that in this case the theory of cold sparks will almost completely dissipate during this time, and perhaps even faster.

You need to cut in the direction of the “spark towards you”, from the far edge of the workpiece from the corner. However, for the reasons described above, it would be better to wear a leather apron, otherwise you will burn your pants. Of course, you should cut so that the flow of sparks is not directed to unprotected parts of the body and even more so to the face.

In general, it is best to operate the angle grinder while wearing electrofusion clothing or other thick, sturdy and fire-resistant clothing, and wear combat boots on your feet. It is reliable and convenient. Yes, never saw a metal profile with corners (especially profile pipes and channels) from the middle, only from the edge or from the corner. The corner can be turned over and cut from the middle (where the “shelves” converge), but at the same time you need to make sure that the cut zone will not be squeezed and the disc will not be clamped.

Do not use a wire smaller than the angle grinder or very long wire for an extension. This can result in a large loss of power and clamping of the disc. Similarly, do not cut an angle grinder when it is powered by a diesel generator, and at this moment the electric welding process takes place.

Before starting work, turn on the machine and hold idle for half a minute. If you hear any abnormal sound, grinding, hissing, etc., turn off the instrument immediately and find out the source of the sound. Sometimes strong noises are emitted by almost torn pieces of paper and or petals of the petal disc, as well as damaged (broken) 1 mm. abrasive discs.

Never start the angle grinder again if the emergency lock has tripped and the blade is jammed in the cut. It is very dangerous ! You should unplug the plug from the socket, carefully pull the blade out of the cut, replace it (as it is almost certainly damaged), test the tool and only then start working, ensuring the cut is released.

Do not under any circumstances allow people or animals to appear in the plane of rotation of the disc. Safety goggles and work gloves should always be worn (leather or any welding gloves are best).

When processing concrete, stone, etc., it is also imperative to use dust protection equipment. Do not operate the angle grinder with the additional handles and guards removed, and do not place any unsuitable discs on it.

Well, of course, you must always monitor the angle grinder so that the tool is fully functional, that there is a whole network cable, the brushes work normally, and so on. By the way, I recommend not to throw abrasive discs in bulk into a bag, but to carry them in a special box so that they do not chise or crack.

Ukrainian brand of power tools has published a bright crash test on its YouTube channel

The well-known Ukrainian brand of power tools and equipment for household and professional use Dnipro-M has published an unusual video on its official YouTube channel. a crash test of angle grinders (angle grinder). Scroll to the bottom of the page to watch the video.

It is noteworthy that this video is of interest not only among regular users of the brand’s products, but even among those people who are not personally familiar with the Dnipro-M power tool. This will help you understand which angle grinder is better.

Crash test angle grinder Dnipro-M

During the crash test, the presenter poured sand directly into the holes of the gearbox, threw the tool to the ground from a height of his own height and disassembled the body of the angle grinder to examine the structure and see what happened to it. All tested models performed really flawlessly.

To understand how to choose a good angle grinder, you should pay attention to the following parameters:

diameter of the disc and nozzles;

Additional features include: ergonomic body and handles, soft start, anti-jamming, dust extraction system and dust-protected button.

What does power affect? The productivity of the selected device directly depends on this parameter. The choice of an angle grinder for home use in most cases comes down to simpler requirements. The minimum power in this case should be about 500-900 watts. At the same time, for an angle grinder in Ukraine remain affordable.

Other features of household models:

lightweight body (up to 2.5 kg);

there is no overload in the power grid;

working disk diameter. 115-125 mm.

The main causes of breakage angle grinder

Consider the typical malfunctions of an angle grinder:

Over time, the oil seal begins to pass water to the bearing and gearbox, flushing out the grease and leading to wear of parts.

If sparks fly and smoke from the angle grinder, work should be stopped immediately and the tool should be taken for repair. This is the gearbox out of order. Such problems can arise when sludge gets into the water.

Some manufacturers of angle grinders put a weak speed control scheme on their tools, which can also cause breakdown.

Another reason why the gearbox may need to be repaired is engine overheating. Any tool periodically needs to be allowed to idle.

Use special accessories to protect your eyes, face and hands;

Completely free up space for work;

Hide flammable materials;

Check the reliability of fixing the workpiece;

Hold the tool firmly with both hands;

Do not put pressure on the angle grinder during operation. She must act “on her own”;

When the work is over, wait until the rotation stops completely, then put the tool with the disc up;

Unplug the angle grinder and make sure there is no smoke.

Do not use an angle grinder to cut wood. This is due to the high degree of danger during such operation.

When cutting wood with an angle grinder, there is a high probability that the braze will come off and cause injury to the operator. There is also a risk that large amounts of wood will be caught in the teeth, causing the angle grinder to slip out of hand.

Correct operation of the angle grinder is the key to your safety and quality work!