Power tools are used at construction sites, factories, enterprises, private workshops, garages, and homes. If you need to cut a metal part, clean it from a layer of rust, and sand the surface, use an angle grinder. Before performing certain technological operations, it is necessary to select an attachment for an angle grinder for grinding metal.
Grinder attachment for metal grinding
Typical sizes
When visiting a hardware store, you can see a wide variety of attachments for an angle grinder. They differ in structure, diameter, thickness. You need to understand how important the technical parameters of the equipment are. If the diameter is larger than permissible, the following problems may occur:
- A low-power tool will not be able to work effectively with large-diameter equipment.
- The linear speed of the cutting edge increases depending on the size. If it is large, the equipment may collapse.
- To work with larger equipment, you need to remove the protective shield. However, this makes the work process unsafe for humans.
The diameter of the central hole, which is intended for landing on the rotating shaft, is 22.2 mm. Typical external diameter sizes are 115, 125, 150, 180, 230 mm.
The new disks contain all the information necessary for the buyer - diameter, thickness, rotation speed, areas of application of the equipment.
Unsafe methods for cleaning old paint from wood products
It is not recommended to use open fire (gas burners) to heat the paint layer. This leads to the ignition of the coating material, and then the wood itself. In addition, some types of wood, when heated, release special resins, due to which you will not be able to repaint the product.
Any type of pre-treatment of a product can lead to unpleasant consequences if you do not follow safety rules and work without protection. If the product can be taken out into the open space, then it is advisable to do this before removing old paint from its wooden surfaces. This will help you avoid the additional hassle of cleaning your home, as well as unpleasant odors resulting from chemical treatment of a wooden item.
Purpose
Among the huge variety of discs for angle grinders, 4 groups of main attachments can be distinguished. They are divided depending on the technological operations performed.
Cut-off
Angle grinder discs are most often used when cutting products from different materials. There are several types of cutting discs:
- Nozzles for metal. Equipment made from electrocorundum. Indicated in blue.
- Attachments for cutting natural stone or concrete. Such discs are made of silicon carbide. Indicated in green. Not suitable for working with red brick or ceramic tiles.
- Equipment used when working with tiles, porcelain stoneware, red brick. Made of metal. The edges are covered with diamond chips. During active operation of metal discs, coolant must be used.
- Nozzles for wood. These are metal discs no different from circular saws.
It is better not to use an angle grinder with a disc for wood. This is due to the fact that circular equipment is extremely dangerous when working with an angle grinder. It often slips off the rotating shaft, jams, and bounces off.
Roughing
Using an angle grinder, metal surfaces are often cleaned of rust, plaque, and paint. To do this, use a nozzle on which a metal wire is fixed. A peeling disc is a product with a brush attached to the outer diameter or a bowl with metal rods sticking out forward.
Grinding
A grinding disc for an angle grinder for metal is called a flap disc. It is used when working with metal and other materials. Separate pieces of sandpaper are attached to it. The size of abrasive particles depends on the required degree of cleaning.
Petal disc for grinder
Sharpening
Most often, sharpening stones are used when working with machine tools. If you don’t have a tool, you can attach a stone for sharpening tools and knives to an angle grinder. Special attachments for power tools with a thickness of at least 0.5 cm are sold.
Types of tools
Mechanical cleaning can be carried out using 2 types of tools: manual and electronic.
Hand tools include:
Electronic instrument used:
- Grinding machine with appropriate attachment;
- Hammer;
- Construction hair dryer;
- Electronic drill.
The greatest effect is obtained using a power tool, especially a sander (sander) or impact drill. Both instruments can be equipped with several types of attachments, including:
- Wire brush;
- Grinding wheel
; - Abrasive;
- Spatula;
- Storms.
Below we will talk more thoroughly about the features of using certain types of tools.
How to properly change a disc on an angle grinder?
To change the attachment for an angle grinder, you need to use a special key, which is included with the equipment. A beginner needs to learn the procedure so as not to damage the equipment and tool. Replacement steps:
- Fix the nozzle motionless. To do this, there is a special key on the front of the angle grinder body (on the other side of the rotating shaft). You need to unplug the tool, press the button, tighten the disk a little so that the spindle fits into the locking hole.
- There are two holes on the pressure ring that fits over the equipment. You need to insert a special key for angle grinders into them.
- With one hand, hold down the disk lock button, and with the other, slowly turn the key counterclockwise with force.
- When the locking ring starts to rotate, you can unscrew it by hand.
After removing the pressure ring, you need to remove the equipment and check the condition of the lower flange. If there is a layer of dirt or remnants of the material being processed, you need to clean the base with a brush. To do this, remove the bottom flange. You can remove the protection. To do this, you need to unscrew the retaining bolts or press the locking ring.
After installing the new equipment, you need to screw on the clamping ring. Next, hold down the rotating spindle lock button. Place the key in the holes of the clamping ring and tighten it slowly while holding the lock button.
Replacing a disc on an angle grinder
Paint remover attachments
Old paint often has to be removed from walls or metal surfaces. In each specific case, different types of fastening machines are used.
What kind of painting can it be?
- Very often, in old houses of the “Stalin” or “Khrushchev” type, the walls were painted with synthetic paints, like nitro enamels, which were applied directly to cement-sand, cement-lime and even lime-sand plasters. If you received exactly this finishing option, then we can say that you are very lucky. In this case, the film is relatively easy to remove, in layers, since synthetics cannot penetrate deeply into the plaster. Of course, if the brushes were made on a primer, then the process will become much more difficult, since adhesion there is several orders of magnitude stronger.
- Petroleum coatings, unlike nitro enamels, are much more difficult to remove, since they are more elastic and cannot lag behind in layers, and often simply rub the surface when trying to remove them. The same can be said about polymers, which are quite elastic, especially since they were used over primers, which significantly complicates dismantling.
READ Is it possible to use an angle grinder as a saw?
Thermal method
The most effective method of cleaning wooden surfaces from paint and varnish is the heat treatment method. Using a hair dryer or torch, the old surface is heated to the melting point. Dye
softens and flakes off, after which it can be easily cleaned with a hand spatula. The advantage of this method is that even thick layers of paint can be removed quickly and efficiently.
Heat treatment and removal of paint from the surface
The processing method is only suitable for wood, and in some cases for metal. Ineffective for plastic, the latter begins to melt and deform at high temperatures. This method is of little use for treating painted concrete, stone or plaster surfaces. A significant disadvantage is the release of volatile toxic substances when the paint is heated.
Conclusion
In addition to nozzles, paint is also removed from the surface chemically using various types of washing. But these methods are toxic and hazardous to health.
Cleaning up minor defects
To eliminate small defects on a paint and varnish machine, an eccentric rotary vibrating machine with an eccentric stroke of 5-8 mm, a rigid plate (for example, with a diameter of one hundred and fifteen mm) and grinding wheels of P80 and P150 gradation (the former are used in the main defect area, the latter in peripheral areas) . Working speed. Up to ten thousand rpm.
An example is a Rodcraft seven thousand six hundred sixty-five two-handed pneumatic clipper or a Festool WTS 150/7 electric clipper, a Sia seven-hole sanding pad and Siadrive Siafast sanding paper (see table at the end of the article).
Professional eccentric sander Festool WTS 150/7 (eccentric stroke seven mm)
Special SCM mugs also cope effectively with the task. Moreover, not only when removing standard layers of enamels with minor defects, but also when removing thick layers of paintwork. See next section.
Table of materials and equipment used
Ensuring safe operation
The grinder is considered one of the most dangerous power tools used on construction sites. While working with it, you need to follow a number of rules:
- Use protective equipment - mask or goggles, gloves.
- Do not remove the protective cover during operation.
- Never use blades with a larger diameter than stated on the power tool.
- Do not use grinding discs when cutting parts.
- Check that the clamping ring is securely fastened before starting the electric motor.
- You cannot cut the workpiece closer to the center if it has two support points at the edges. Because of this, the disk can jam and rupture.
- Check the integrity of the equipment before starting work.
- Do not pinch the clamping ring.
- Do not use the grinder near flammable materials or liquids.
- After starting the tool, you need to wait a few seconds for the disk to spin at maximum speed.
- Do not press the tool against the workpiece when cutting.
- If the disk is jammed, you must immediately turn off the tool.
- Metal corners, profiles, and large-diameter pipes are cut in two approaches.
During active work with an angle grinder, you need to use coolant, which is poured over the cut area.
The instrument itself should be allowed to rest every 5 minutes. An angle grinder can perform various technological operations. There are different types of equipment for this. In order to avoid mistakes when choosing equipment, it is important to take into account the power and dimensions of the tool. Also, we must not forget about safety precautions.
Features of mechanical cleaning
It is not always necessary to remove the old layer of paint before applying a new one. Much depends on the properties of both the old and new paint and varnish composition. If adhesion is ensured without removing the coating, there is no need to waste effort on mechanical processing of the material. Grinder attachment for removing old paint?
Water-based compositions that can adhere to almost any surface have the best adhesive properties.
If reliable adhesion of materials cannot be ensured, removal of the old coating cannot be avoided. You will also have to remove old paint if you plan to level the surface, since leveling mixtures practically do not adhere to painted materials.
Installing a type of old paint is not particularly difficult: just try to pick off a piece of the coating. Water-based coatings chip off quite easily. Oil paint will be more difficult to remove.
From the point of view of labor costs and the selection of a suitable tool, the determination of the material from which the base is made is of great importance. For example, removing paint from sandy plaster is an easy task, but removing the coating from concrete is much more difficult.
Sanding belt attachment
This additional device installed on the grinder allows you to sand hard-to-reach places on wooden, metal, stone and other objects.
The attachment is a narrow structure, with a handle and a base on which a sanding belt (sandpaper glued in a special way) is attached. This adapter connects to the grinder; the length of its working body is 115 mm.
The attachment is used for sanding structures with a lot of patterns, small parts and hard-to-reach small places. Also, it is effective for sharpening working and household tools - knives, scissors, shovels, axes.
