Disc brush - designed for processing and cleaning surfaces from dirt, rust, varnish, welding seam, the range of work is quite wide both in everyday life and in any production.
It is used in conjunction with a grinder or a drill. These brushes come in different shapes, sizes, and also differ in the thickness of the hair, some are very hard, some are softer.
Let's consider them in more detail.
Brushes for angle grinders
different shape
- They can be easily distinguished by a hole in the center of the circle with a diameter of 22.2 mm, they are installed like ordinary cutting discs, put on and tightened with a nut. Some come with a nut right away, they just need to be screwed onto the thread.
Brushes differ in diameter, there are for small and large angle grinders (from 115 to 200mm). - The thickness of the hair may be different, depending on the type of work. Hard brushes have a thickness of 0.5 mm, softer ones have a thickness of 0.3 mm. For a gentle mode, in order not to particularly damage the surface, it is better to use soft, hard bristles made of hardened steel wire are better suited for cleaning the weld.
- The shape of the brushes can be in the form of a disk, it is better to work in narrow places, clean grooves, climb into hard-to-reach metas. If the surface is large and flat, it is better to use a cone or cup brush, the work will go much faster than using a flat one.
hard and soft
- They can be easily distinguished by the pin in the center, which is needed to secure the cartridge.
- The size range is smaller than for angle grinders (up to 100mm).
- The shape can be both flat and in the form of a cup, a cone, you select it for a specific task.
- Brushes differ in the degree of hardness, different hair thickness: 0.3mm and 0.5mm.
There are also polymer-abrasive brushes for a drill.
More flexible than metal
These can be used to clean lacquer, shallow rust. Their advantage over wire ones is that they are more flexible and will crawl into difficult places. Or, for example, if the object is of a complex shape, very corrugated, it is also convenient to use such a brush. It is definitely not suitable for hard processing.
Today, angle grinders are one of the most popular handheld power tools. The high manufacturability of use has made the "grinder" popular in industrial production, the domestic sector.
One of the regular duties of angle grinders is the processing of steel surfaces. Technologists of leading manufacturers have developed a special type of components used in grinding.
Classification and specifications
Despite the extensive range of dozens of items, metal brushes for grinders have two main varieties that are actively used during stripping.
cup design
Designed for rough processing of iron blanks. The optimal application of such samples is the finishing of flat steel products that have a significant surface area. The specificity of operation lies in the fact that the process occurs at high speed. The industry produces products characterized by the following main technical indicators:
- diameter of nozzles for hand power tools 6.5-15.0 cm;
- the shape is conical, end;
- landing threaded connection M10 and M14.
Useful advice! Sometimes, depending on the type of grinding components and the type of material, it is convenient to perform grinding at different speeds. The best option is to use an angle grinder with a rotation regulator.
This contributes to the quality of finishing workpieces. The product is a cup of conical shape with pressed steel wire bristles. Rigidity is regulated by using different pile diameters.
Disc brushes
The main component of grinding are steel threads. The main area of application is the processing of welding joints, joints. They are made in the form of discs. Ideal for polishing hard to reach areas. They are used in the production of a gentle cleaning regime, rust removal, giving parts a presentation. Differ in a high margin of safety, long term of operation. Serial samples have several main indicators:
- the technological size of the diameter of the product ranges from 0.115-0.20 m;
- steel pile 0.3 and 0.5 mm up to 7 cm long;
- bristle layer thickness 6-20 mm;
- seat with thread M10, M14;
- operating speed up to 12500 rpm.
Metal brushes for the grinder, which are made using the technology of filling the working pile with plastic, deserve special attention. This technique increases strength and working life.
Rigidity class
Regardless of the type of metal brush for the "grinder", they differ in the elasticity of the bristles. The release technology provides for a different technique and material for the manufacture of pile. The entire line has several varieties of grinding wire:
- rope steel;
- metal brass plated;
- corrugated;
- twisted;
- filled with polymer compounds;
- stainless.
The standard diameter of individual threads is 0.3, 0.5 mm. The thicker wire is intended for primary processing, while the soft brass pile and "corrugation" are used during finishing.
Application area
Such versatile products as metal brushes for grinders are widely used in many areas of production:
- mechanical engineering;
- production of welded iron structures for various purposes;
- operation, repair of steel pipelines;
- maintenance of machines, mechanisms;
- preparation of surfaces for applying paint and varnish coatings.
This is only a small fraction of the general list of areas of use for such a universal device, which is in demand almost everywhere.
All photos from the article
In this article, we have to find out which attachments for a grinder for wood grinding can be found on a wide sale. We will get acquainted with the features of the solutions and learn how to properly apply each of them. In addition, the reader will probably be interested in how convenient all these devices are compared to a specialized one.
Sandpaper
It is used in two quite different externally and functionally devices.
Nozzle with Velcro
This product is a plate with a thread corresponding to the thread of the shaft of an angle grinder, with an adhesive layer (Velcro) applied to its front surface. Velcro is used to attach replacement wheels made of ordinary sandpaper.
Such a nozzle for grinding wood on an angle grinder can be produced in several versions:
- Its material can be plastic or rubber. In the first case, a soft foamed polymer layer contacts the paper: a rigid base with a slight misalignment of the rotation axis will leave untidy circles on the surface of the workpiece being processed.
- Several holes are often left in the plate to cool the sandpaper and the surface of the plate more efficiently. At typical grinder speeds (from 10,000 rpm or more), the heating of the abrasive surface becomes more than a serious problem.
- Finally, the nozzles may differ in diameter - depending on which circle the grinder is made for. Typical sizes are 125, 150 and 180 millimeters.
Note: nozzles of this type are more convenient to use with the protective cover removed. The height of the plate allows you to work with it; however, the casing significantly impairs the view of the grinding field. Of course, the presence of safety glasses during work is mandatory.
The circles for the respective nozzles, in addition to size, quite predictably vary in grit. They can be marked both according to domestic standards and according to foreign ones; the latter option is much more common, since most of the abrasive wheels, belts and other grinding tools are imported. In Russia (to be precise, in Belgorod) only wide sandpaper is produced in rolls.
Good to know: domestic paper has the letter “H” in the marking; an increase in the number in the marking indicates an increase in the grain of the abrasive. The exception is "zero", which is designated as M40. Imported sandpaper is marked with the letter "P"; the larger the number, the finer the grain.
To help the reader avoid confusion with markings, we will bring domestic and foreign designations into a single table. The grain size increases from top to bottom.
| Imported products | domestic products |
| P400 | M40 |
| R320 | 4-N |
| R220 | 5 - H |
| R180 | 5 - H |
| R150 | 8 - H |
| R120 | 10 - H |
| P100 | 12 - H |
| P80 | 16 - H |
| P60 | 25 - H |
| P50 | 32 - H |
| P40 | 40 - H |
| R36 | 50 - H |
| R24 | 80 - H |
For grinding wood with your own hands, the most in demand:
- Grain R40. Typically, it is used to remove noticeable projections, surface irregularities or to clean up a layer of paints and varnishes.
Useful: the coarser the grain, the slower the abrasive surface clogs.
- Grain P80 allows you to remove scratches left after rough grinding.
- Small caliber (P100 - P120) is used to prepare the surface for varnishing or painting. It also cleans up the sagging of the coating and removes the pile that rises on the surface of wood or plywood after applying the first layer of varnish or enamel.
In addition to grinding wheels, polishing products made of felt and even sheep's wool can be found on sale.
Petal attachment
The petal grinding attachment for a wood grinder differs from the device discussed above in two features:
- She is disposable. No replaceable abrasive cloths are provided here: after the wear of the petals, the entire product is replaced.
- Unlike the disc nozzle, it does not have a perfectly flat working surface: the nut fixing the nozzle in the middle protrudes beyond the plane of the circle. This feature is compensated by the slope of the petals.
Due to the specific shape of the flap nozzles, it is convenient to use for grinding the ends of wood-based panels, cleaning the seams of log cabins, chamfering and rounding corners. To work on a plane, it is better to purchase a product of the first type.
brushes
It is believed that metal brushes are designed to clean steel surfaces from paint and rust. This is true; however, products made from brass-plated steel wire, due to their relative softness, are also successfully used on wood. The price of a brush, which does not exceed 150 rubles, combined with a much higher resource compared to sandpaper, makes it a more than competitive solution.
In the photo - a brush head made of brass wire with a diameter of 0.3 mm.
What can metal brushes be used for?
Of course, fine grinding is not their profile.
- They help to quickly and effectively remove paint and varnish coatings from hardwoods.
Please note: as a rule, the main layer of paintwork materials is removed with a spatula after heating with a hair dryer, burner or after treatment with a wash. The brush helps to clean paint residue from cracks, corners and surface irregularities.
- They allow you to perform the so-called.
The last term is worth focusing on. Brushing is the artificial aging of wooden pieces of furniture or interior. When brushing, the softest fibers are removed from the surface; while texture irregularities and annual rings are emphasized. This simulates the natural wear of the product.
Brushing is especially impressive after staining: the relief of wood is emphasized by the transitions of tones.
angle grinder vs grinder
So what's the best way to grind? What is more practical - a grinder attachment or a full-fledged grinder?
- Compared to a belt grinder, a grinder with a nozzle of any type loses unambiguously and hopelessly. The performance of these products varies significantly. If you have a special tool for grinding planes at your disposal, the instruction is obvious: use it.
- A household vibrating angle grinder with a disc nozzle for replaceable abrasive wheels will seriously compete. Both the processing speed and the result will be quite comparable.
Conclusion
The video in this article will help the reader learn more about them. Good luck!
Nozzles on the grinder give the machine a lot of functional purposes. One of them is working with wooden surfaces. Even the use of a tool in the garden for cutting down trees is relevant today, especially in the spring and autumn seasons.
Sanding a wooden surface, such as a floor or timber used for building structures, is an absolute necessity so as not to get injured from protruding layers of wood.
A grinding attachment for a grinder for processing this kind of surface is usually available at retail, and it is not difficult to select it according to the size of the landing diameter. Usually a grinding wheel is used for this.
But to get the job done right:
- It is necessary to study the condition of the treated surface to the subtlety. To do this, it is recommended to mark the area for processing with chalk or to carry out a preliminary troubleshooting of the surface in order to exclude additional inspection during the work and purposefully perform the task. This method will significantly reduce the time costs.
- You should pay attention to the presence of fungus on the surface, as well as cracks and chips. Before using the tool directly, these defects should be eliminated.
- The presence of black spots is also alarming, so they must first be treated with a special compound. The pores will open, and the front of work will be visible.
There are some nuances that do not make it possible to carry out work with high quality, for example, the circles from the grinding wheel still remain, and a separate refinement of the surfaces using sandpaper is required.
With all of the above, there is no need to neglect simple safety rules:
- The circle should be free of chips, cracks, and when touched with a metal tool, it should make a ringing sound.
- The date of use of the circle must be indicated on the circle itself.
- It is unacceptable to work without a protective screen.
- The employee must wear overalls, closed-type shoes and a headgear.
- Before direct use, carefully inspect the cable for bare wires.
- The nozzle for the grinder must be firmly fixed to the technical tool in order to avoid flying out.
- Before performing the task, you need to test the operation of the mechanism by idling.
Types of grinding devices
If you choose the wrong cleaning circle for the grinder, the ongoing process can take a long time. But it also does not make sense to buy an expensive tool and accessories for it, since the operations may differ from each other.
In the modern construction market, there are many offers for the purchase of nozzles for grinders.
List of nozzles and what they are intended for:
Manufacturing technology is as follows:
- at one end of the handle, a special device is made necessary to secure the technical device;
- on a fixed shaft structure, the end of the tube with an angle grinder with a previously welded corner for movement is fixed;
- on the back of the fastener, a spring adapts, which allows you to return the machine to its original position.
Everything is quite simple and reliable and everything is done in one place.
- Cutting discs. Angle grinders are also used with special cutting discs. The latter are available in retail in a large assortment. They can be used to cut hard surfaces.
Some disc features:
- on the most round form of the disc there are about 6 cuts that do not reach the central axis;
- the device of the segments contributes to rapid cooling during operations for cutting a metal product;
- they are used for cutting wood, brick, concrete and metal.
Diameter parameters vary from 150 to 200 mm. The thickness of the packing layer depends on the characteristics of the material to be processed. For example, for sawing wood products, 2 or 3 mm of nozzle thickness is enough. Many discs are made with diamond coating. This solution provides strength during processing and eliminates the risk of injury, because the circle cannot scatter in different directions.
Polishing and grinding discs can be made of various materials:
- cloth;
- felt;
- from sandpaper;
- their sponge materials.
The use of a special paste for the nozzle is mandatory to eliminate strong friction on the surface. These discs are used to repair car bodies.
For tool sharpening and peeling, 3 types of nozzles are mainly used:
- Diamond grouts. They are used for sawing stone as well as concrete surfaces and bricks. But for metal products, their use is unacceptable.
- Abrasive grinding discs. They are used for cutting metal surfaces to a fairly large depth. The outer side of them has a smooth surface, and the inner side is rough. They are used on angle grinders of small size.
- Twisted discs with cutters. Used to remove paintwork from stone. The surface becomes perfectly even and smooth.
The support plate for angle grinders is designed for fastening wheels on emery or fabric bases during grinding operations. Fastening around is carried out using a pressure washer, and the coating allows you to process even difficult surfaces.
Final part
Today, without the use of an angle grinder, it is impossible to imagine modern production, and in the garage, almost every owner on the farm has this technical device. Its use is multifunctional, and applicable to any type of work, both repair and for the manufacture or processing of any assembly unit or product. Nozzles for angle grinders also have different functions, which allows them to be used in different directions. Therefore, it is not necessary to contact the repair shop, and all the main part of the work can be done independently.
Often in life there is a need to clean materials that have a large area. An example would be steel sheet gates that you need to derust and paint. Also, sometimes you need to clean boards and other similar materials from dirt. What to do if you don’t have a suitable tool at hand, but you don’t want to buy expensive cleaning machines? There is a way out, you can use your cool nozzle, which will allow you to quickly clean large objects.
The design is very simple, the nozzle is a shaft that rotates on just one bearing, the second bearing is the one installed in the angle grinder. In total, as many as 6 brushes are installed on the shaft, which greatly increases productivity. The body is made from sheet metal. You just need to fit the parts and weld them. The brush shaft itself is made very simply. So, let's take a closer look at how to make such a nozzle.
Materials and tools used
List of materials:
- 6 brushes for the grinder;
- threaded rod and nuts (for the manufacture of the working shaft);
- bearing;
- Sheet steel;
- a cylinder of suitable diameter (for the body);
- thick sheet steel (for clamping bracket);
- dye.
List of tools:
-
- vice;
- drilling machine;
- welding machine;
- tap;
- spanners.
Homemade manufacturing process:
Step one. Manufacturing of side parts
From sheet metal, you need to make two parts, these are the side parts of the homemade product. One of them will have a bearing installed. The steel should be quite thick, at least 2 mm is needed to obtain the desired rigidity. We cut out two identical parts, as the author in the photo. This can be done with a grinder. The final adjustment is made using a grinding nozzle to remove all irregularities.
The next step is to drill holes, for this you will need a drilling machine with the appropriate bits. In one part, we drill a hole of such a size that the “nose” part of the grinder, where the bearing is installed, can go there.
As for the second part, it is enough to drill a hole in it with a diameter slightly larger than the working shaft. You will also need to drill two more small holes to secure the bearing with threaded rods and nuts.
Step two. We make a clamping bracket
To mount the nozzle on the grinder, you will need to make a special bracket. To make it, you need a thick piece of steel. We go to the drilling machine and use a 44 mm bit to drill a hole, do not forget to use lubricant for cooling.
When everything is ready, we retreat about 1 cm from the cut hole and cut it out. You also need to remember to make "islands" where the tightening screw will be installed. How the product should look like, look at the photo. We cut it out with a grinder, it's a little long and tedious, but quite solvable. Grinding with grinding discs.
Now we clamp the workpiece in a vise and cut the ring so that it can be compressed, you need to cut out some metal. Well, then we drill a hole, cut the thread and wrap the screw.
The clamping bracket is ready, now it needs to be installed on the plate made earlier. To do this, you will need a welding machine. You need to weld only in one place, since the bracket must be compressed with us.
Step three. We install the bearing
To install the bearing, you will need two bolts or just threaded rods. They need to be welded to the second plate, as a result, studs will be obtained. Secure the bearing with washers and nuts.
But before the final fastening of the bearing, it still needs to be finalized. Inside, you need to press a piece of pipe so that the shaft fits tightly into the bearing. For these purposes, the author uses a vice.
Step four. We make a working shaft
To make the shaft, we need a threaded rod of suitable length and diameter. Weld a nut to one of the sides, it will be needed to connect the grinder to the shaft. Well, then install the brushes! In total, you will need 6 pieces, just screw them onto the threaded rod, do not forget to install a washer between each brush. We tighten each part with a wrench.
That's all. You can immediately install a part with a bearing on the shaft, we fasten the shaft with a nut.
Step five. Making the mounting bracket
The bracket that will be attached to the grinder needs to be finalized. Although it tightens well, it can turn over under high load, and this is extremely unsafe. For these purposes, the author welds an additional fixing plate to it, at the end of which there is a hole. Now you can additionally fix the structure with a bolt. What is at stake, look at the photo. At the end, install the workpiece on the grinder.
Step six. We make the case
The case is a protective shield, it also connects both parts together. Steel for this will also need to be quite thick, and in order not to be wise with the profile, look for a cylinder that is suitable in shape. It could be an old fire extinguisher, or something similar. We take the necessary measurements and cut out the desired part.
Well, then it’s a matter of technology, we take a grinder and grab the parts together. It is desirable to do this with the shaft installed on the angle grinder so that there are no distortions. Well, then you can remove the nozzle and finally weld everything. Cut off the excess parts after that, if any remain.
Step seven. We manufacture and install the handle
The handle is very important for such a nozzle, it is responsible for ease of use, and, of course, for safety. To make a handle, you will need a piece of steel pipe. We cut it at the right angle and weld it. Finally, weld the handle to the nozzle well. In the future, it will be possible to put on a piece of rubber hose or something similar to keep it nice. You can also clean the welded seams of the handle.