What are the discs for wood for a grinder and how to use them correctly?

The grinder is one of the most popular tools for treating various surfaces - be it metal, stone or concrete. It is also called an angle grinder. Usually angle grinders are used to process metal or stone workpieces. But in some cases, the grinder can also be used as a woodworking tool.

This question is asked by most of the owners of angle grinders. Yes, the grinder can be used to treat wood surfaces. But not always. By its purpose, the grinder is not intended for woodworking. Special attachments, which are recommended to carry out work on wood processing, began to be supplied to the market of carpentry tools not so long ago.

The main operations that can be performed with this tool on wood surfaces are grinding and roughing work. For their implementation, it is worth using special nozzles. It is important to remember - in no case should you cut wood in a circle on metal or stone. This can lead, at best, to tool breakage, or even injury. The saw blades can get stuck in the workpiece and the tool can simply fly out of your hand. Also, cutting wheels tend to overheat when cutting wood. In this case, the circle can fall apart and hit the face.

Diamond coated grinding wheels are designed for metal surfaces. They are distinguished by their high strength and durability. This type of attachment can also sharpen blunt tools. It is not recommended to cut wood with this circle. Abrasive discs are designed for grinding and have different grit sizes. An abrasive is the material that forms the basis of a circle. Quite often, electrocorundum or silicon carbide can be used as such constituent components.

Saw blades are designed for cutting and have a large classification. They can be designed for different materials. But not all of these types are recommended for cutting or processing wood materials. There are separate attachment options for wood.

Wood should be cut with a grinder, only using metal discs specially designed for this, which have teeth at the edges. There are some disc options that can be used to carve wood. Usually, the wood cut with a sander is shallow. For cutting large workpieces, it is better to use a circular saw, which is specially designed for processing these materials. But some grinder attachments allow you to cut or process small workpieces.

Among the cutting options for circles on wood, two are worth highlighting.

• Circular circle. This nozzle is a circle with teeth. Usually these have a maximum diameter of up to 180 mm. On large circles, there are soldering. There are circles that are more compact, which have no soldering. In general, circular discs are considered a "dangerous" option for attaching a sander for cutting wood pieces.Therefore, it is advisable to choose circular discs that provide protection against jamming it in the material. This is due to the fact that the teeth on this version of the disc are slightly apart.
• Chain circles. These models are the best suited for working with a grinder with woody species. The risk of tool jamming in the workpiece is minimized. On the rotating base of such a nozzle, a chain is stretched, used on chain saws. In this case, the fit of the chain on the wheel is not fixed, which reduces the risk of handling the tool. That is, even if the chain flies off the circle during operation, the circle itself will not break and fly apart, as can happen with other models.

Also worth noting are the disks with small and large number of teeth. In this case, their number will depend on the diameter of the circle. Small discs (up to 150 mm) have 3 teeth. Larger discs have 4 teeth. For woodworking, it is advisable to use discs with a small diameter, that is, with 3 teeth. Large discs are usually used by specialists for processing large workpieces. Small discs are suitable for standard household work. In general, these attachments do a very good job of sawing wood.

Separately you need to talk about discs made of a special material - tungsten carbide. They are relatively new, but thanks to them it became possible to cut wood with a grinder. Externally, the nozzle is a circle divided into cutting segments. That is, the teeth themselves are absent on such a circle. The big advantage of this type of wheels is their high strength. The disc easily cuts wood of any strength, and even the presence of nails or other metal products in the workpiece will not interfere with its work - a tungsten carbide wheel also cuts small metal parts. The cost of such a nozzle for cutting wood is much higher than that of the previous options, but safety and high quality of work with this disc are guaranteed.

The next category of wheel models for the grinder is roughing. These nozzles are designed for processing on the surface of the workpiece. For example, to remove bark, remove large amounts of dirt or level the workpiece. The processing operations themselves are much safer than cutting wood. Therefore, angle grinders for wood processing can be safely used, but do not forget about special attachments. It is customary to distinguish several types of roughing nozzles. Among them are roughing discs with spikes or abrasive grit. Abrasive cutters come in a variety of sizes. Thanks to them, you can grind the workpiece from the end or remove the top layers.

Also, the roughing options for nozzles include disks with twisted wire. They are sometimes called "cord brushes". These attachments can be of two types. The first looks like a cup with a wire attached to it, and the second is a disc with a wire around the edges. With these devices it is convenient to remove old paint, rust, etc. from the surface of the workpiece. Also, circles with twisted wire are used for brushing the surface of a tree. This is done to give the surface an antique look. By themselves, nozzles with wire are a disk-plane, because they perform essentially the same functions.

Among the peeling nozzles, there are petal circles. Such a scraper disc has several layers of sandpaper or other abrasive tape on its surface. It is important to take into account such an indicator as the grit size of the sandpaper. For roughing it is worth using wheels with coarse sandpaper. It is worth working with such a circle carefully, as you can easily damage the surface. For a more delicate and soft finish, use medium to fine sandpaper.

Also, modern manufacturers offer on the market sticky discs. This is a fairly new type of accessory used for woodworking. The essence of this circle is the presence of Velcro on it, on which you can fix a peeling tape of any grain size. This version of the attachment is universal, because Velcro can also be used to put materials for processing metal or other surfaces.

The next category of attachments is used for polishing or sanding wood surfaces.

For grinding, the same Velcro discs or fine-grain petal attachments. For soft processing and polishing of the wood surface, use felt-coated nozzles. That is, such discs are a rotating circle on which there is densely compressed wool. Also, these models can be fine-haired, coarse-haired or universal - semi-coarse-haired.

The basis of any quality work depends on the right tool. And the discs for the grinder should be given great importance, because this is the main part that will carry out the processing of wood. Many accidents when working with a grinder happen precisely due to the fault of an incorrectly selected disc. A skewed or stuck nozzle in the workpiece makes the grinder uncontrollable - it flies out of your hands and can easily cause damage. Or the disc can break apart into small pieces that fly apart at great speed. The consequences of such cases are the most sad. This usually happens due to tips with defects, chips or cracks. Therefore, there are several factors to consider when choosing the right saw blade.

• Type of work. To begin with, it is worth deciding on the type of operations for which you have to use the disc on the grinder. The varieties of circles, depending on the type of work, have already been presented above.
• The diameter of the disc must also be taken into account. Usually this figure starts from 115 and ends with 230 mm. But large-diameter nozzles are often used for working with metal products. For working with wood, circles with a diameter of 125 mm are considered a universal option. This size is ideal for household work. Circle diameters over 150mm are commonly used by professional carpenters for large surface areas.

• The diameter of the circle also depends on the size of the grinder itself. It is advisable to install discs of a smaller diameter on a small grinder. The inner diameter of the wheels may also differ, especially if the tool is old. The current ID standard is 22.2 mm.

• Number and location of teeth. This factor will depend on the type of wood you have to work with. A universal option is a three-tooth circle for a grinder. With this nozzle, it is possible to cut wood lengthwise, across, and you can also make various cuts and grooves. The disc with alternately beveled teeth protects from the absence of chips on the material. Moreover, such discs are designed for processing different types of wood. Straight-toothed nozzles are recommended for softwood applications.

For processing chipboard, you can use discs with trapezoidal teeth.

• Disc thickness. The average disc thickness for a grinder for wood processing is 2 mm. Here it is necessary to take into account how wide the cut on the workpiece itself needs to be made. For example, when working with a chain disc, the cut will be very wide - up to 8 mm, because the disc itself is quite wide. Therefore, for thin cuts, it is worth using small-width nozzles.Accordingly, the diameter also plays a role here - the larger it is, the greater the thickness of the nozzle.
• Visual inspection. If everything is decided with the type of work and the model of the nozzle is selected, then it is necessary to carefully examine it. No one is immune from fakes, so you should choose a disc with no external defects - no chips, with all the teeth present, without cracks.

Among the main manufacturers supplying circles for the grinder to the domestic market, it is worth highlighting the following brands.

• "Speedcutter Graff". This accessory model has three large prongs, designed for woodworking and some more durable materials. It is made of tungsten carbide, so it is highly reliable. Even with prolonged operation and strong friction against the workpiece, the disc does not heat up and does not warp.

• "Cedar". These discs of a domestic manufacturer with multiple teeth are made of high-strength steel. The disc does not grind for a long time and successfully copes even with hard wood species.

• "Vortex". This manufacturer has also proven itself from the best sides. High-quality discs for wood have an increased level of wear resistance and perfectly even cuts due to high-quality grinding of the nozzle itself.

When choosing a disc for a grinder, it is important to pay attention to the EAC quality certification. After all, all discs are manufactured according to the strictly established GOST. It is not recommended to take suspicious models that have not passed certification or from unknown manufacturers.

Even professionals are not insured against accidents. Maybe that's why they became professionals, because they followed safe work techniques? This is the main component of any work.

• When working with the grinder, you must wear protective goggles or a mask, and work in protective clothing.
• It is highly discouraged to work with a damaged attachment.
• You need to hold the grinder strictly with both hands.
• Do not work in high humidity conditions. After all, the grinder is powered by the mains, and electricity and water are a rather bad combination.
• Before starting work, check the insulation of the wire on the tool.
• Remove flammable materials and flammable liquids from the work area.
• You only need to work with the protective cover on the tool.
• It is advisable to wear a respirator, since a large amount of dust is generated during the processing of the material.

There are officially established requirements for labor protection when working with a grinder. Before starting work, it is advisable to carefully read them. Below are the main criteria for admission to work with angle grinders.

• An employee must be at least 18 years old who has undergone medical examinations, introductory instructions and appropriate training to work with the tool. Knowledge of first aid is an important criterion for an employee.
• Before starting work, it is extremely important to securely fasten the workpiece to be machined. There is no need to try to hold it with one hand and the grinder with the other. You can use a vise for this. It is extremely important to remember that the material should not have bends in the cutting or processing area.
• It is necessary to ensure that the cord from the device is outside the processing area so as not to accidentally cut it. Whenever possible, stand so that sparks or dust do not fall on clothing and face.

• When working with a grinder, it is recommended to use a special construction vacuum cleaner. This device removes dust from the workplace. Some grinders are equipped with special dust collectors. After work, the tool itself must be cleaned of dust by wiping with a slightly damp cloth, and then dry. The ingress of moisture inside the device is unacceptable.
• The grinder should be guided over the workpiece strictly in the direction of rotation of the circle.Also, put the grinder on the floor or other surfaces only after the disc rotation has completely stopped.
• Do not start cutting with old paint or a large layer of dirt. First, you should carefully grind the surface, and then start cutting.
• Work with a grinder should be done exclusively on dry wood. Do not use raw material. You need to wait until it is completely dry.
• You should not start work with voltage drops in the network.
• When turning on the grinder, you must wait a few seconds until the tool picks up full speed.
• It is not recommended to stand in the direction of movement of the grinder. If possible, it is worth taking a stable position slightly to the side.

When working with some attachments, certain guidelines must also be followed.

• For rough and surface treatment of the material, use a cord brush. With it, you can also set the desired shape for the product. For rough cutting or sawing, chain discs can be used.
• For bevel cuts, it is recommended to use end discs.
• Using felt discs, you can achieve the smoothest possible surface. They are best used for treating future flooring.
• Also, in circles on a tree on a grinder, you can carry out milling operations.

• If it becomes necessary to remove the protective cover, then this is done quite simply. In general, when cutting any material, the cover must not be removed. It is the only protection between the hand and the disc, which rotates at up to 11,000 rpm. But when sanding or scraping, the shroud can sometimes get in the way. On some grinders, the casing is attached with several screws that must be unscrewed. And some grinders have a special latch that you need to unfasten and rotate the casing along the groove until it is removed.
• When working, you should take into account such an indicator as the cutting depth of the material. If you have to cut a thick workpiece, that is, a deep cut is required, then the grinder is not recommended. For this, it is better to use special saws or machines. Wood-tipped grinders are usually designed for shallow cuts, grooving, etc.
• Wood is a heterogeneous material. You need to work on wood with various attachments. Therefore, it is recommended to purchase several different cutting blades to carry out different operations depending on the material.

• Do not press the grinder unnecessarily. The speed of rotation of the disc is very high, so the tool will cope with the cut independently and without unnecessary pressure. The disc can be skewed under heavy load.
• From time to time there is a need to change the attachments. This may be due to a breakdown of the disk or the need to replace it with another one to carry out new work. But sometimes it happens that the holding nut on the grinder clamps very tightly and it is almost impossible to unscrew it. To do this, you can take a few simple steps. Take a blunt object and hit the disc in the direction of rotation of the grinder.

On some types of grinders there is a special button with which you can remove the disc without using a key. The digger is clamped and the disc rotates manually in the direction of travel. Then the nozzle is simply removed and the disc can be replaced. In general, in order to avoid unnecessary clamping of the nut, you can use a little trick - put a piece of thick paper or cardboard between the nut and the disk. In this case, the nut does not grip the disc too tightly and can be unscrewed without much effort.

In the next video, you will find a wood wheel test for a grinder.