How To Sharpen A Circular Winning Disc

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How easy it is to sharpen a victorious saw blade

The saw blade on my Makita 2704 is dull. There is no finance to buy a disk from Makita or SMT at the moment

The use of water for cooling can lead to rust on the parts and assemblies of the machine. To eliminate corrosion, soap and certain electrolytes (sodium carbonate, soda ash, trisodium phosphate, sodium nitrite, sodium silicate, etc.) are added to the water, which form protective films. For normal sanding, soap and soda solutions are most often used, and for fine sanding. low-concentration emulsions.

However, when sharpening saw blades at home with a low intensity of sharpening work, they do not resort to cooling the wheel so often. not wanting to waste time on it.

To increase the productivity of sharpening with abrasive wheels and reduce specific wear, you should choose the largest grain size, which provides the required surface cleanliness of the sharpened tooth.

To select the grit size of the abrasive, in accordance with the sharpening stage, you can use the table in the article about sharpening bars. For example, in the case of using diamond wheels, wheels with a grain size of 160/125 or 125/100 can be used for rough sharpening, for finishing. 63/50 or 50/40. Wheels with a grain size of 40/28 to 14/10 are used for chipping.

The peripheral speed of the wheel when sharpening carbide teeth should be about 10-18 m / s. This means that when using a 125 mm diameter wheel, the engine speed should be around 1500-2700 rpm. Sharpening of more brittle alloys is carried out at a lower speed from this range. When sharpening carbide tools, the use of hard modes leads to the formation of increased stresses and cracks, and sometimes to chipping of the cutting edges, while the wear of the wheel increases.

When using machines for sharpening circular saws, changing the relative position of the saw and the grinding wheel can be realized in different ways. moving one saw (the motor with the wheel is stationary), the simultaneous movement of the saw and the motor, only the movement of the motor with the wheel (the saw blade is stationary).

A large number of sharpening machines of various functionality are produced. The most complex and expensive programmable complexes are capable of providing a fully automatic sharpening mode, in which all operations are performed without the participation of a worker.

In the simplest and cheapest models, after installing and securing the saw in a position that provides the required sharpening angle, all further operations. turning the saw around its axis (turning per tooth), feeding for grinding (bringing it into contact with the wheel) and controlling the thickness of the metal removed from the tooth. produced by the worker manually. Sharpening a circular saw can be done both with the help of a blunt blade that contributes to the increase. It is advisable to use such simple models at home, when the sharpening of circular saws is episodic.

An example of the simplest machine for sharpening circular saws is the system, the photo of which is shown in the photo below. It consists of two main units. motor with circle (1) and support (2) on which the sharpened saw is mounted. The turning mechanism (3) is used to change the angle of inclination of the blade (when sharpening teeth with a beveled front plane). How to properly dilute and sharpen a circular disc. How. The screw (4) moves the saw along the axis of the abrasive wheel. This ensures that the required rake angle is set. The screw (5) is used to set in the desired position of the limiter, which prevents excessive entry of the wheel into the interdental cavity.

If there is no machine for sharpening saw blades

Precisely holding the required sharpening angles, holding the saw in your hands from the weight. the task cannot be repaired even for a person with a unique eye and enviable rigidity of hands. The most reasonable in this case is the simplest sharpening device, which allows you to fix the saw in a certain position relative to the circle.

The simplest of these tools for grinding circular saws is a stand, the surface of which is at the same level as the axis of the grinding wheel. By placing the saw blade on it, you can ensure that the front and back planes of the tooth are perpendicular to the saw blade. And if the top surface of the stand is made movable. fixing one side to the hinged, and the other. resting on a pair of bolts that can be screwed in and out. then they can be set at any angle, having the ability to sharpen an oblique tooth along the front and back planes.

However, in this case, one of the main problems remains unresolved. exposure of the same front and rear sharpening angles. This problem can be solved by fixing the center of the saw in relation to the abrasive wheel in the desired position. One way to do this. make a groove on the surface of the mandrel support on which the saw is installed. By moving the frame with a circle in the groove, it will be possible to maintain the required cutting angle of the tooth. But for sharpening circular saws of different diameters or sharpening angles, it must be possible to either move the motor or the support, and with it the groove. Another way to provide the desired sharpening angle is simpler and install on the step of the stops that fix the disc in the desired position. At the end of the article there is a video demonstrating such adaptation.

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Features:

Saw blades are sharpened using various equipment. Processing can be carried out semi-automatically, that is, without human intervention, the task of the craftsmen is only to install parts on the machine and remove them. Most often, there is a type of equipment on which sharpening is done manually. It is distinguished by easy adjustment thanks to the equipment in the form of locking levers, and the exact observance of the required sharpening angle is carried out using special latches. The main feature is the linear feeding method. In this way, a high-quality processing of both the rear and front teeth is achieved. Thanks to the additional function of the machines, which is the diagonal sharpening of the edges, the operation of the saw is simplified and the quality of the cut obtained is improved. When choosing a blade for sharpening saw chains, the first thing to consider is the grain size. Fine grain products provide minimal chain processing, while coarse grain products remove sufficient material. The cost of such discs is directly influenced by the fame of the manufacturer, the quality of the base and the type of product.

Wiring

If the saw blades are sharpened on their own, it is worth remembering about the spreading of the edges, in which all the teeth are gradually bent in different directions, but the distance between them remains the same. These actions can be performed using a special tool called routing, it provides an even bend in the middle of all elements. After carrying out such a procedure, the saw will acquire a freer stroke, and the kerf width will become larger.

Taking into account that the cut is made not by the disc itself, but by its edges, which gradually remove layers of wood, it becomes clear that with an increase in the spread of the teeth, the probability of jamming decreases, and the cut becomes wider. It is worth noting that in this case, more effort is required to operate the tool. In the absence of special tools, many people use an adjustable wrench to separate the teeth, but this technique has many limitations and is not suitable for all saws.

The type of layout is primarily influenced by the type of wood that will subsequently be processed. For example, to obtain an even cut without any flaws and protrusions on soft rock, a large set is required. It is desirable that the teeth deviate to the selected side by 5-10 mm. Sharpening of saw blades for wood is carried out only after setting, otherwise the teeth will be unsuitable for use due to the resulting deformation.

Saw blade sharpening process

Things to consider when processing

The principle of operation of the sharpening disc has its own characteristics, as well as its structural design. The materials for its manufacture are based on compounds of nitrogen and boron, which increase not only the accuracy of processing, but also resistance to high temperatures that characterize the process itself. It should be borne in mind that wheels have different diameters and are suitable for different tools and types of materials, therefore, you need to carefully select the required model in accordance with the available tool to be processed.

Material and properties of carbide teeth

In domestic saws, sintered tungsten-cobalt alloys of grades (6, 15, etc., the figure means the percentage of cobalt) are used as a material for cutting inserts. 6 has a hardness of 88.5 HRA and 15 has 86 HRA. Foreign manufacturers use their own alloys. Cemented carbide is mainly composed of cobalt cemented tungsten carbide. The characteristics of the alloy depend not only on its chemical composition, but also on the grain size of the carbide phase. The smaller the grain, the higher the hardness and strength of the alloy.

The carbide plates are attached to the disc using high temperature brazing. As a material for soldering, silver solders (PSr-40, PSr-45) are used, at best, and at worst. copper-zinc solders (L-63, MNMC-68-4-2).

Material and properties of carbide teeth

In Russian saws, sintered tungsten-cobalt alloys of grades VK (VK6, VK15, etc.) are used as the material for cutting blades. The number means the percentage of cobalt. BK6 has a hardness of 88.5 HRA, BK15. 86 HRA. Foreign manufacturers use their own alloys. Hard alloys VK consist mainly of cobalt cemented tungsten carbide. The properties of the alloy depend not only on its chemical composition, but also on the grain size of the carbide phase. How to sharpen the saw yourself? How to sharpen a saw with your hand saws. The smaller the grain, the higher the hardness and strength of the alloy.

Strengthen the carbide plates to the disc by high-temperature brazing. How to sharpen a saw or you can remove the disc from how to make a circular table. How to sharpen a saw with your own hands. As a material for soldering, in the best case, silver solders are used (PSr-40, PSr-45), in the worst case. copper-zinc solders (L-63, MNMTs-68-4-2).

How to sharpen a saw blade correctly?

Sharpening your circular saw is one of the main safety measures for this tool. Indeed, not only the quality of the work performed, but also the likelihood of injury during work depends on this procedure. Therefore, sharpening the tool should be carried out regularly to avoid wood scrap and the risk of injury.

The company “Mnogofrez” recommends sharpening the saw blade on wood as it wears out. This will protect not only the workpiece from damage, but also the tool itself.

When sharpening is needed?

Professionals recommend regularly sharpening the tool. But how do you know when the sharpening time has come? To do this, you need to pay attention to the following signs:

the appearance of smoke and a specific burning smell;

the need to apply effort when working with the tool;

a large number of flaws on the workpiece after cutting;

rounding of the disc edge when viewed under a magnifying glass.

When one or more of these signs appear, you need to hand over the tool to a sharpener or sharpen it yourself.

Basic sharpening rules

The main condition for the long-term operation of one disc is timely sharpening. At the same time, experts advise adhering to the following recommendations:

Avoid cutting radius more than 0.2 mm.

First of all, sharpening is carried out on the main edges, the main part of the wear of which lies on the front part.

The side faces are also machined during heavy wear.

Metal layers are removed gradually, no more than 0.15 mm in one pass.

When used for sharpening an electric tool, overheating of the disc is not allowed.

To ensure the maximum service life of a disc with sharpening up to 30 times, experts recommend that when sharpening, remove the same material thickness from the inner and outer sides of the disc.

You can properly sharpen the saw blade with your own hands only with the help of special tools.

For better results, you can use sandpaper. Verification is usually carried out in the process. The good quality of sharpening is evidenced by a smooth cut without visible defects.

Sharpening methods

Sharpeners know how to sharpen a circular saw blade correctly. The services of a specialist will provide a good result, but you will have to pay money for them. With special tools at your disposal, the procedure can be carried out independently. This will require the following tools:

wheels for sharpening saws with diamond abrasive;

file for sharpening and a vice for fixing the disc;

a professional machine is expensive, but the result is the highest quality.

The company “Mnogofrez” presents a wide range of milling tools. If you do not know how to sharpen a circular saw, our consultants will provide you with all the information you need to sharpen yourself.

Tools

It is allowed to sharpen the saw with your own hands only when using special devices. For this, there is a grinding machine that helps to carry out the process on an automatic machine, and not manually. Then the result becomes more accurate.

In addition, other improvised devices are used for sharpening:

  • Mounting vise;
  • File;
  • Piece of wood.

You will not be able to replace the listed devices. If at least one of them is not available, then sharpening will not work.

How to sharpen: basic methods

There are two methods available for sharpening circular saws. manual and machine. In order to sharpen the disc correctly at home, you need to take into account some of the nuances.

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Manual way

Special saw blade sharpening machines are rarely used in a domestic environment because their cost is high. Therefore, in the absence of such a device, you can cope with sharpening with improvised devices, for example, an angle grinder. In this case, it is forbidden to hold the circle in your hands without fixing it with anything. Otherwise, it will not be possible to achieve a sufficient cutting angle for further work with the material.

To securely fix the circle in the correct position, use a flat stand.

  • the surface of the stand coincides with the level of the axis of the grinding wheel;
  • on it, the gear wheel is placed in such a way that the sharpening plane becomes perpendicular to the saw blade;
  • the design of the device is complemented by a swivel joint.

The stand will help you to comfortably position the saw blade for cutting in relation to the abrasive material. Before starting work, clear markings are carried out. For this, a colored marker is used. They draw a mowing line, which will allow the element to be sharpened at the desired angle. A vise will help secure the disc to the surface.

Video of sharpening a circular saw blade angle grinder:

How to sharpen a circular saw blade correctly and at what angle

The use of circular saws is especially common in construction. Most of the work requires cuts and changes in the shape and size of the finished materials. The circular saw helps you tackle these tasks quickly and get quality results. But the instrument is not capable of serving forever, sooner or later it may become dull. It is for this that you need to know exactly how you can sharpen saw teeth in a domestic environment.

  • How to determine wear?
  • Types of cutting teeth
  • Tools
  • Sharpening principles and angles
  • How to sharpen: basic methods
  • Manual way
  • Using a machine

How to determine wear?

Checking the saw blade for wear is an important issue that should be given special attention. Deep damage leads to the inability to sharpen the circle. There are three main signs by which you can understand that the saw needs to be sharpened or replaced:

  • Excessive heating of the protective cover and the formation of smoke. The circular saw has a special cover that signals when the saw is blunt by heating. In particularly difficult situations, smoke may appear from it.
  • Sometimes the saw device involves a mechanical feed (if you need to adjust the pressure with your own hands). In such a situation, wear can be noticed if the pressure has to be increased.
  • If carbon deposits and strong unpleasant odors form on the workpiece when sawing wood.

All situations described above tell the user that the device should be sharpened.

Sharpening principles and angles

There are four main sharpening corners at the edges of the saw. Together with the shape of the tooth, they can act as the main operational characteristics of the tool. The following are used to describe each tooth:

  • Front and back angle.
  • Cut angles of the front and back surfaces.

These characteristics may depend on the type and weight of the circular saw, its purpose, as well as the density of the particular surface.

Sharpening angles in the diagram

Based on the parameters indicated above, all circulars can be divided into several types:

  • For slotting longitudinal holes. For this task, use a 15 to 25 degree rake angle.
  • For cross-cutting. In this situation, the rake angle can vary from 5 to 10 degrees.
  • Universal sharpening. Saws are sharpened at an angle of 15 degrees for any operation.

The size of the sharpened angle is not only determined by the direction of movement of the saw, it is also related to the material of the workpiece. When cutting through very hard materials, the smallest angle should be chosen. To work with softer products, the angle increases.

Important! If a carbide saw has been used for long enough, maximum wear will be seen at the top cutting edge. A detailed examination of the plane of the tooth shows that the anterior surface of the material suffers most.

Types of cutting teeth

There are four planes on the surface of the teeth. front, back and two side.

At the moment of intersection with each other, they create a single cutting edge, due to which the sawing of surfaces occurs.

There are several forms of teeth:

standard circular blade grinding machine, round knife sharpen machine, disc blade processing machine

  • Straight tooth. Most often it is used only for a quick longitudinal cut. During such work, quality and accuracy are practically unimportant.
  • Oblique tooth. The back plane of such a part is tilted to the right or left. On saws, these teeth often alternate, which is why they are called “alternately cut”. These teeth are most commonly used in tools. The size of the corners can be different, this is due to the coating of the treated surface. wood, chipboard, plastic. They are used for longitudinal and transverse movements. The large angle of inclination on the tools is used when cutting boards with double-sided lamination. This helps to avoid chipping of the material. The larger the chamfered corner, the easier the saw will cut through the surface. But this greatly increases the likelihood of tooth breakage. On some products, the teeth are inclined not only at the back, but also at the front.
  • Trapezoidal tooth. The main advantage of this type is that the edge blunts slowly. But they are rarely used separately, usually alternated with straight teeth. During the operation of the device, the trapezoidal teeth are located above the straight ones, therefore, they take over the main (rough) sawing work. Straight teeth for finishing. This saw design is used for sawing plastic, chipboard and MDF.
  • Conical tooth. This type of tooth is considered optional because it only helps to cut the lower part of the material (most often the laminate). This design allows you to protect the surface from chips and cracks. Tapered teeth usually have a straight front edge, but it can also be concave. This type is used for finishing the saw cut.

Important! Each type of teeth requires a thorough grinding when sharpening. You can’t sharpen them at the same angle.

Sharpening saws on wood

A saw for wood is the most important tool in the hands of a specialist, which must work properly and reliably, especially if the saw is correctly sharpened. However, when buying this product, the consumer is not always happy with its pungency. Wood saws are often sold blunt. To a greater extent, this applies to large-toothed tools. Therefore, the issue of sharpening remains relevant for those who wish to achieve efficient saw operation.

It is known that there are different forms of sharpening for each type of work.

  • The saw must be parted first if it is not sufficiently parted. It is best to do this using a specialized layout. But if such a part is not at your disposal, then pliers can also be used.
  • The saw is clamped with the teeth up, the operator must perform actions so that he can see the whole process along the blade.
  • Then you need to bend every second tooth in different directions, accompanying each movement by tilting the pliers at an equal angle.
  • Often, wiring is already present to a small extent initially. The owner of the saw simply needs to increase it when it comes to raw wood or large saws. If the saw is small and is designed to perform work that requires great accuracy, then the factory wiring is sufficient.
sharpen, circular, winning, disc

In the process of sharpening a saw on wood, you will need a file that has three edges.

A triangular file is used to sharpen the teeth. This process is carried out from the inner surface in relation to the setting of the saw teeth. The file is positioned at an angle in the cutting edge. This angle should be sixty to forty-five degrees.

In practice, it is much more efficient to first sharpen one side of the teeth, and then, turning the saw over, sharpen them on the other side. Thus, a person makes the same type of movement, which allows you to sharpen the saw faster and more efficiently.

When sharpening saws, it is necessary to follow the most important rules that not only allow you to achieve a higher effect, but also ensure safety. To do this, when sharpening saws, you must:

  • eliminate any background noise or communication with other people,
  • you should turn off the radio, TV, thus achieving complete silence, creating a situation in which no one can distract you.

Otherwise, any careless movement or reaction of a person to a distracting sound can lead not only to damage to the instrument, but also irreparable consequences, causing damage to human health.

Experts advise you to pay attention when the saw goes to the side during cutting. This indicates an uneven setting of the teeth, which needs to be corrected by increasing their deflection from the side to which the saw is pulled.

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Saw Tooth Set

The teeth are set when it is required to provide more free movement of the saw blade. The teeth in turn are bent in different directions at the same distance using a set. With its help, the tooth is folded back approximately in the middle of its height. The setting is a tool for making the saw teeth set, it has the shape of a plate, in which there is a slot.
An adjustable wrench can also be used, which also successfully sets the teeth.

To work with soft woods, the teeth must be set more, in the case of hard ones. less. But this advice is hardly useful to those who work directly in the forest. Under these conditions, the degree of hardness, density and moisture of trees is hardly possible.
In order to choose the right wiring, you will have to test this device in different conditions, the best option would be three tenths. five tenths of a millimeter in one direction. The general requirement is to set the teeth no more than the blade thickness on both sides. It is necessary to do the wiring before sharpening.

Mechanized disc sharpening

Materials and tools:

  • saw blade;
  • disc sharpening machine;
  • pendulum goniometer;
  • marker.

How to sharpen a circular saw in a mechanized way? There are many different machines. Some mechanisms have software packages to provide a fully automated turning mode. In a home workshop, when disc turning is occasional, a simpler device can be used.

Saw blade teeth sharpening angles: rake angle (γ), rear (α) and bevel angles of the front and rear planes (ε1 and ε2).

How to sharpen a disc? In such a machine, after installing and fixing it in a position that provides the required sharpening angle, all other operations rotation of the blade around its axis, control of the thickness of the metal removed from the tooth performed manually.

Sharpening a straight tooth along the front plane is performed in the following sequence. Install the canvas on the frame of the machine. Clamped with a centering sleeve. Then, using a mechanism, it is installed in a strictly horizontal position. Thus, the bevel angle of the front plane is provided equal to zero. If the machine does not have a built-in angular scale, the horizontalness of the disc is checked using a pendulum goniometer.

Then the screw of the mechanism is rotated, which provides horizontal movement of the frame with a circle. The required rake angle is set. The blade moves in a position in which the front plane of each element fits snugly against the working surface of the circle.

A marker is made to mark the first tooth from which sharpening begins. Then the engine is turned on and the front plane is sharpened. The machine brings the tooth into contact with the circle and performs several movements of the blade back and forth while pressing the element against the circle.

After sharpening one element, the blade is removed from contact with the abrasive wheel, rotated by one element. Then the operation is repeated in the same way. This is how the machine works until the element marked with a marker has completed a full circle, showing that all elements are sharpened.

Sharpening a beveled tooth differs from straight turning in that the saw is positioned with an inclination equal to the bevel angle of the front plane. To sharpen an element along the back plane, it is necessary that the machine allows the blade to be installed so that the back plane of the element is in the same plane with the surface of the circle.

To sharpen a circular saw on a machine, you do not need to have special skills. Anyone can cope with this work if they follow all the instructions and rules for working with disc sharpening machines.

Saw blade sharpening

The circular saw is sharpened from the rear if you work in a position facing the material being cut.

  • The front surface running into the material during sawing remains unchanged.
  • You can sharpen the disc directly in the machine. Otherwise, you can remove it from the machine or circular saw.
  • In the first option, you first need to unplug the plug from the socket to prevent the consequences of starting the machine, which can happen accidentally.
  • The disc must be wedged, for which thin pieces of wood must be put on both sides of it and pressed against the teeth.
  • With a marker, you need to mark the side of the tooth from which you will begin to sharpen. This will allow you to avoid mistakes in such a responsible work.
  • Attention and extreme caution must be exercised.

It is important to remember the number of movements you make when sharpening the first tooth, whether you used a file or diamond file.

You will need the same efforts in order to sharpen all the other teeth.

If you removed the disc from the machine, it must be clamped in a vise in order to do the same activities that you read about above.

Then the disc returns to the machine, the unnecessary piece of wood is sawn. Check the tine height if you experience a lot of noise or an uneven feed. This can be done by bringing a marker to the cutting edge and turning the disc with a hand in a slow rhythm one revolution in the direction opposite to the direction of rotation. Each tooth will receive a mark, when examining the disc, it will be revealed which teeth are higher than the others. If there is a significant difference, it is necessary to carefully reduce their height.

How to properly dilute and sharpen a circular disc

How to sharpen a circular saw

  • Sharpening circular saws
  • How to set the disc teeth
  • Mechanized disc sharpening

How to sharpen a circular saw? Circular saw it is a necessary tool in the construction of a summer cottage. It surpasses other types of saws in terms of its accuracy and cutting quality. The duration of the structure’s operation depends on the quality of its sharpening.

The service life of a circular saw also depends on the quality of its sharpening.

An unsharpened disc increases the load on the mechanism. As a result, it can break.

Periodic sharpening of circular saws is required.

Signs that indicate that the saw needs to be sharpened:

  • when sawing, a heavy load must be applied;
  • the edges of the cut burn;
  • the engine overheats;
  • smoke appears during operation.

Sharpening circular saws

Materials and tools:

Circular saw blades.

  • saw blade;
  • file;
  • diamond file;
  • marker;
  • thin wooden blocks;
  • vice;
  • wiring;
  • adjustable wrench.

How to sharpen a circular saw with a disc? The circular saw must be sharpened from the rear when working with the blade facing the tree. The front surface, which is on the material when cutting, remains in the same position.

You can turn the disc in the machine. You can pull the canvas out of it. If turning is carried out in the device, you must remove the plug from the electrical outlet to prevent accidental switching on of the device. It is necessary to glue the product by placing thin blocks under it on both sides and press them down to the teeth.

It is necessary to mark with a marker the element from which the turning begins. When turning, care must be taken and maximum attention must be paid. Turning is done with a file or diamond file.

It is necessary to remember the number of movements and applied forces when turning the first tooth. The same effort should be applied when turning the rest of the parts. If the blade is removed from the machine, you need to clamp it in a vice, then sharpen each tooth in the same way. Then the web is installed back into the device.

Check the cut on the sample. If noise occurs during operation or the material feed is uneven, check the tine height. To do this, bring the marker to the cutting edge. Then you need to slowly turn the canvas by hand 1 turn in the direction opposite to the direction of rotation. In this case, a mark will appear on each tooth. On examination, you can find out which elements are higher than the rest. If the difference turns out to be significant, you need to carefully reduce the height of the elements.

Saw sharpening

Let’s go over the material how to sharpen a saw for wood or sharpen a circular saw.