Protective cover and glasses. prerequisites for safe operation. The two most important rules that must be followed strictly. You cannot work the angle grinder with the protective cover removed and without glasses. Sparks, abrasive particles, metal fragments and scale. inevitable satellites when working with an angle grinder. Eye contact may result in personal injury.
Glasses or their replacement mask must be closed. Sparks and splinters fly along a complex path and are able to fly behind glasses or a mask if they are open from the side. It’s good if the mask has a safety net, since the impact of the fragments of the circle can be so strong that the unarmoured mask can not withstand the impact.
The protective cover is the first barrier between the operator and the circle rotating at great speed. Destruction of the latter. quite common. Many who use the angle grinder more or less regularly, at least once, but have come across it. Most often, the destruction of the circle occurs when it is clamped (jammed) in the slot.
The protective cover is installed so that sparks and debris are not ejected towards the operator. Below are images that clearly show how the casing protects the operator in the event that the wheel collapses during rotation. It is clearly seen that the sector of expansion of the fragments is defined by the opening in the casing.
At the end of the article there is a video of this experiment.
Mounting the casing should exclude its spontaneous rotation. As it would not be inconvenient in some cases to work with the casing, its removal from the tool is unacceptable. Otherwise, the operator is not safe from the most unpleasant consequences.
Other personal protective equipment. In addition to glasses, mittens or gloves should also be referred to mandatory personal protective equipment when working. Hands are in close proximity to the rotating circle and must be protected from sparks, abrasive particles and metal fragments. It is best to use thick leather gloves to protect your hands; cotton gloves cannot provide reliable protection against sparks.
A dust mask or mask is used if stone materials are processed without the use of dust extraction devices.
Clothing should not be wide and well dressed. Dangling parts can be tightened in a rotating circle.
It is not permissible to install larger circles on the angle grinder than those for which it is intended. Small size angle grinders have higher rotational speeds than large size angle grinders. Circles of large diameters (both new and used and reduced in diameter) may not withstand high speeds and collapse. This is all the more dangerous because to install a large circle you have to remove the protective cover. In addition, too high a load due to rotation of a large circle causes increased bearing wear and reduces tool life.
You can also not use damaged circles: with cracks, chips and potholes, having deviations from roundness or flatness. This can lead to a back strike and the final destruction of the circle with the creation of a traumatic situation.
One of the most important safety requirements when working is an angle grinder. inadmissibility of use of angle saws for wood in an angle grinder. Because of its extreme danger, this should be absolutely excluded. The history of the operation of grinders is full of tragic facts arising from the installation of saw circles for wood on them.
This is due to the fact that the tree. This is a heterogeneous material in which there are knots that can lead to a back strike. Nails can also get caught. In addition, the angle grinder has very high revolutions and the saw blade becomes dull quickly.
After installing the tool, it is necessary to check the operation of the angle grinder idling for at least 1 minute at maximum speed. In this case, the circle should rotate freely, without touching the protective casing, and the vibration should not be more than usual.
When laying a workpiece, its bending in the cutting zone should be excluded, especially if it narrows the cut. In this case, it is almost inevitable that the circle is clamped in the cut and a back strike. A correctly laid blank must have stops in the cut area and along the edges.
The angle grinder must be held firmly with both hands. This is a fundamental requirement that must be strictly observed. If the holding of the tool is reliable enough, then even a back strike will not lead to a large displacement of the tool or pulling it out of the hands.
It is necessary that the body position is stable, without the possibility of imbalance.
Video: Safety Gloves For Working With Angle Grinder
The power cord should be away from the spinning wheel. Otherwise, it may be cut or captured by the disk. Both will create a dangerous situation. short circuit and abrupt stop of the disc with tool displacement.
Do not let the angle grinder out of your hands until the rotation of the wheel stops completely. to prevent any objects or bearing surface from engaging in a rotating circle.
When moving from one workplace to another, you must turn off the tool. A spinning wheel can grab clothing or touch foreign objects.
If during operation there was an interruption in the power supply, you must turn off the angle grinder so that when the power is restored, it will not start uncontrollably.
During operation, the cutting and grinding wheels become very hot; you must not touch them until they have cooled down.
All unauthorized persons must be at a safe distance from the work area. so that flying sparks and abrasive particles. and in the event of an accident and fragments of a circle. couldn’t harm them.
Cutting angle grinder. It is necessary to enter the circle in contact with the material at full spindle speeds, otherwise the circle may jam.
Manufacturers of grinders unequivocally recommend cutting so that the direction of movement of the tool and the rotation of the circle coincide. In this case, the possibility of an uncontrolled exit of the circle from the slot is excluded.
Perhaps this is precisely the security requirement that users violate most often. The fact is that with such a conduct of the tool a stream of sparks flying out from under the circle hides the marking, which makes it impossible to keep the circle along the intended line. Therefore, many users deliberately violate safety requirements by cutting in the direction opposite to the rotation of the circle. In this case, sparks do not hide the marking, and it is more convenient to conduct accurate cutting. And, nevertheless, the correct operation of the angle grinder involves guiding the tool so that the direction of movement coincides with the direction of rotation of the circle.
When cutting, it is important to ensure the correct position of the angle grinder. The fishing line should pass by the operator, and not rest against him. In this case, when the wheel seizes, the reactive movement of the tool will also take place to the side.
The guard must be between the wheel and the operator. Only in this case does it provide reliable protection.
When cutting, you must avoid strong pressure on the angle grinder. It is necessary to enable the tool to cut "in the home". Overloading leads to warping of the circle and the risk of jamming with a reverse impact. The task of the operator is to adjust the stroke of the tool by lightly pressing it in those places where it is necessary.
When cutting profiles, the cut should begin at the smallest cross section.
Do not turn on the tool if the circle is in the cut.
Grinding Angle Grinder. For grinding, do not use too thin cutting wheels. It is impossible to grind a lateral surface of a cutting wheel which is not intended for work. Circles are not designed for significant lateral forces and may break. Grinding should be carried out by the edge of a circle inclined at an angle of 15 to 40 degrees to the grinding plane. In this case, the tool moves with moderate pressure forward and backward. When starting to use a new disc, do not work with the tool in direction (B), otherwise it will crash into the workpiece. After the edge of the disk is rounded, it can be used both in direction (A) and in direction (B).
Cutting angle grinder of concrete, tile, stone. Concrete, tile or stone should be cut with special circles designed to work with these materials. When cutting these materials, a lot of dust is formed, which is harmful to health. In chipper cutters, a more closed protective casing with a pipe for connecting a vacuum cleaner is made to remove dust.
If it is impossible to organize a dust suction, it is necessary to use a respirator with a filter of class P2. You can also suppress dust with a jet of water directed to the cut, use the ventilation of the room.
You need to be especially careful when making wall cuts, in which various pipelines, electrical cables and fittings can be located. If a disc hits them, a back strike may occur. Damage to a circle of electrical wires can cause a short circuit, accidental cutting of a gas pipeline can lead to an explosion. Before you perform work in unfamiliar places, you need to study them for the availability of communications.
Kickback. The main hazard during operation of the angle grinder is a back strike. sharp and sudden rejection of the tool as a result of jamming of the rotating circle in the workpiece. In this case, the destruction of the circle often occurs.
According to the laws of physics, the reactive movement of the tool occurs in the direction opposite to the rotation of the disk. The kickback is usually the result of an operator error. To prevent it or to avoid serious consequences if it nevertheless occurred, certain precautionary measures will help:
- Hold the tool firmly with both hands. For this, standard handles must be used.
- The body must be in a stable position. This will help withstand the force of the kickback.
- It is necessary to be away from the place where the instrument will be displaced during the reverse impact. If the cutting wheel is "push", in the event of a kickback, the power tool may bounce right on the operator.
- When machining corners and sharp edges, you need to be especially careful and be prepared for the possible rejection of the tool. Especially often, a back strike occurs when the cut is completed, when the last bridge connecting the individual parts of the workpiece is cut. In this case, it is recommended that, without completing the cut, remove the circle and carefully cut the jumper on the other side, in order to avoid a back strike.
- When jamming, you need to turn off the tool and remove it from the cut.
Special Security Requirements. The rules for working with an angle grinder imply the fulfillment of a number of requirements, which, although not directly related to the cutting and grinding operations themselves, are very important.
There should be no flammable liquids and gases, combustible materials: fuel, solvents for paintwork materials, rags, etc. near the working area.
It is necessary to remove materials and products that may be affected by sparks and splashes, in particular, plastic and ordinary glass, on which traces of unrecoverable remain after sparks. If you can’t remove them, you need to cover them with some suitable material (for example, a wet rag).
When using the angle grinder in a damp room or outdoors in high humidity, it is necessary to connect it through an RCD to prevent electric shock.
Unauthorized people should not be trusted to work with an angle grinder unless there is confidence that they are qualified to work safely. Access to the angle grinder for children should also be excluded.
The experiment of the expansion of fragments of a circle when working angle grinder