Features of using a machine for sharpening a circular saw. Sharpening circular saws with pobedit tips

The process of constructing private houses and various buildings will be quite complex without the use of a circular saw. It is significantly better than many wood saws because it surpasses them in accuracy and cleanliness of the cut.

Due to the fact that this tool is actively used, it wears out quite quickly, and therefore sharpening circular saws with your own hands becomes extremely necessary.

What you need to sharpen circular saw blades

First of all, you need to prepare the appropriate components that will allow you to properly sharpen the saw blade for wood. It is important to provide the following tools:

file;
assembly vice;
wooden block;
colored marker.

How to know when it's time to sharpen your circular saw

Sharpening a circular saw should only be done when necessary. You can recognize the onset of such a moment by two clear signs. In particular, urgent sharpening of a wood circular saw is necessary:

If strong heat regularly occurs on the safety guard of the saw in the area of the electric motor. In some cases, with such an increase in temperature, smoke is released under the casing.
With strong pressure on the tool to obtain a good cut while processing the material.
If dark marks appear, traces of soot on the wood and a characteristic smell of burnt wood. This occurs due to the fact that the teeth of the saws are dull.

Types of sharpening cutting teeth

To better understand how circular saws are sharpened, you need to study the features and structure of those parts of the tool through which the material is cut. Cutting teeth are the main element involved in sawing wood.

They are made of carbide metal. The cutting teeth consist of 4 working flat surfaces: front (a), rear (b) and two side planes (c), which have an auxiliary role. By means of one main (1) and two additional (2 and 3) cutting edges, intersection lines are formed for each specified working plane.

Depending on its configuration, a circular saw may have different types of cutting teeth:

Straight tooth type. Often used for accelerated longitudinal sawing. They do not have ideal cutting quality.
Beveled (oblique) type of teeth. They have a characteristic angular cut on the right and left rear surfaces. In some cases, the blades have teeth with different bevel sides, which alternate along the entire circumference of the saw. Using such discs you can cut wood, chipboard and various plastics. A large bevel angle ensures a high-quality cut without chipping the cutting edge.
Trapezoidal type of teeth. The cross-section of the cutting surfaces is trapezoidal in shape. This configuration allows you to work without dulling for a long period of time. Often the disc has straight teeth that alternate with trapezoidal ones. In such cases, the trapezoidal element plays the main role in rough cutting, while the straight tooth type is used for finishing.
Conical teeth type. They have a cone-shaped appearance. As a rule, they perform an auxiliary function for preliminary cuts on the laminate. The conical type of teeth is used to process the specified floor covering. This saw allows you to avoid chipping the material, as often happens when using the main saw.

Video “Sharpening circular saw blades”

The process of sharpening a circular saw blade.

The principle and angle of sharpening circular saw blades

The working part of a circular saw is sharpened at 4 main sharpening angles. They relate to the main technical parameters of the cutting disc, as well as the type of shape of the cutting teeth.

It is worth noting that all circular saw teeth are characterized by front (γ), rear (α) angles, as well as the cutting angle of the front and rear surfaces (ε1 and ε2). The value of each specified angle must correspond to the purpose of the sawing devices, the materials being cut and the direction of sawing.

In particular, the rip saw is sharpened at fairly large rake angles (15° - 25°).

The sharpening indicators of the front corners for transverse types of cuts are in the range of 5° - 10°. Universal options, used for processing materials in all types of directions, are standardly sharpened at 15°.

At the same time, the value of the specified angle is also influenced by the fact of how hard the objects being cut have. Their value has a strict dependence: with greater hardness of the material that is being cut, the cutting teeth should be less pointed.

According to the main principle of sharpening teeth on a carbide saw blade, it is important to take into account that during long-term operation the most significant wear processes occur on the upper cutting edges. As a result, with intensive use, their lines can be rounded up to 0.3 mm or more. Regarding the tooth planes, it is worth noting that the greatest wear occurs on the front surfaces.

When properly sharpening a cutting element, the cutting edges must be shaped in such a way that the radius of their roundings does not exceed 0.2 mm. In this regard, it is recommended to perform parallel grinding of the metal on the front and rear planes of the teeth. The use of this method is considered the most appropriate. It is possible to sharpen only one front plane, but in such cases this operation requires more time. In addition, the teeth will grind down faster, since it becomes necessary to grind off a larger layer of metal from the front surfaces.

The standard layer for grinding metal is 0.05-0.15 mm.

How to sharpen a circular saw with your own hands

You can sharpen your saw at home completely on your own. For these purposes, there is no need to visit a workshop to use a specialized sharpening machine or purchase one. It is quite expensive, and is rarely used for sharpening, unless of course you plan to use it for large-scale production purposes.

But holding saw blades in your hands while sharpening teeth with a grinding wheel is not the best solution. A circular disc is not a drill, it is much larger. No amount of steady hands and excellent eye will allow sharpening to be done so that the cutting elements are sharp enough and suitable for effective use. To do this, you need to provide the simplest fixing device.

To hold the toothed circular wheel in the desired position relative to the plane of the sharpening tool, you can use the most ordinary flat stand.

The position of its surface must correspond to the level of the axles on the rear disk. The toothed wheel is placed on a stand so that the plane of the tooth to be sharpened is perpendicular to the blades of the saw blade. To sharpen beveled teeth on the front and rear surfaces, you need to provide movable hinges in this device.

But in such cases it is quite difficult to maintain the same values of the front and rear sharpening angles of the tool. To eliminate this problem, it is necessary to rigidly fix the center of the saw in the desired position in relation to the grinding wheel. This is done using grooves for a mandrel, which is mounted on a stand with the saws to be sharpened placed on it, or by installing a special stop on the stand, which will secure the saw blade according to the required angle to the abrasive stone.

If you adhere to all the requirements for sharpening a carbide circular saw, then this tool will work as efficiently as possible over a long period of time.

Video “How to sharpen a saw blade with your own hands”

Demonstrative video on how to sharpen a cutting saw blade yourself.

Sharpening circular saws is a mandatory activity during the operation of this equipment. Wood processing requires the master to have tools with appropriate cutting properties at his disposal. Just like sharpening chainsaw chains, circular saws require extra attention. If the shortcomings are not corrected in time, over time the tool will begin to become dull much faster.

Saw sharpening is a common activity, as is DIY chain sharpening. You can entrust the device with carbide, pobedit tips to specialists. This is due to the fact that pobedit tips have increased hardness, which makes it impossible to sharpen with a regular file. This will require an expensive diamond grinding tool.

The first thing you need to do is determine the current condition of the saw wheels. Chainsaw blades and chains show certain signs of wear. If you are aware of them, you will easily know that the sharpness of the circular saw has deteriorated significantly.

The temperature on the motor housing of your circular saw has started to rise significantly.
To cut a workpiece, you have to put in more physical effort with your hands. A similar phenomenon is typical for dull chainsaws.
Smoke may occasionally come out of the engine.
When processing workpieces, an unpleasant burning aroma is formed.
Dark spots form on the edges of the saw blade. This is soot. It can also appear on the surface of chainsaw chains.
The wooden workpiece begins to move jerkily around the machine, although during normal sharpening the movements should be smooth.
There is some extraneous noise when the machine is operating.
The geometry of the teeth of the saw blades of your circular saw is disrupted.

General sharpening rules

Photos of methods for sharpening circular saws

As in the case of sharpening chainsaw chains, sharpening yourself requires following certain recommendations.

Carefully monitor the uniform removal of metal along the profile of the teeth of the saw wheel;
Never press the saw blade tightly against the grinding wheel. If the machine for sharpening circular saws comes into close contact with the wheel being sharpened, this will lead to overheating and further deformation of the material;
Make sure that the sharpening height and profile are maintained upon completion of processing operations;
When sharpening discs, use coolant. This is also recommended for those who sharpen chainsaw chains;
Avoid the formation of burrs when turning the saw blade;
When sharpening edges, rely on an important rule. It is necessary to sharpen only the front, or the front and back sides of the tooth. Although in practice, many DIY craftsmen prefer to sharpen saw blades from the back side, considering this method more convenient;
Products with pobedite tips are sharpened with diamond sharpening devices. Only such tools can truly effectively restore the cutting properties of a given tool. You can use a regular file, but in fact it will not give the required effect.

Sharpening methods

You can use a saw sharpener or improvised tools.

There are three main sharpening methods, where a specific device is used and the rules for processing discs are followed. It is difficult to say which of them is the most correct. After trying each method, you can draw certain conclusions for yourself.

Sharpening happens:

Classical;
Full profile;
Sharpening the edges of the teeth.

We will talk about each of them separately.

Classical

This sharpening technique has been used for a long time, which is why it got its name.

Sharpening begins from the back surface of the disc.
The front part, which runs into the material when cutting, remains in its unchanged position.
Processing can be carried out directly on a circular saw or remove the saw wheel by placing it in a vice.
If you sharpen on a circular saw, be sure to disconnect the machine from the power supply.
To secure the disc, use a pair of bars that will secure the circle like wedges. The bars must be pressed tightly against the workpiece to prevent it from moving during turning.
Using a felt-tip pen, place a mark on the first tooth you will start with.
Perform a certain number of movements with the sharpening device on the first tooth. Remember their number.
For all subsequent teeth, repeat movements similar in quantity and intensity.
Upon completion of sharpening, be sure to check the functionality of the updated saw with your own hands. If there is no extraneous noise or vibration and the disk machine behaves stably, you have managed to do the job correctly.

Alternative solutions

Alternative sharpening methods include the two methods we described above. They are quite effective, which is why they are often used by craftsmen.

Full profile saw blade processing. Among all turning methods, this method can be considered the most accurate and high-quality. This is due to the fact that specialized sharpening machines are used for full-profile sharpening. A special circle is selected by size and in one approach passes the entire cavity between the teeth of the disk, while capturing the surface of the adjacent cutting edge. This method of turning saw blades avoids the possibility of tooth deformation. The only drawback of the sharpening method is that to process saws of different profiles you will need to use the corresponding different wheels.
Turning the edges of teeth. The popularity of this method of turning circular saw tools is explained by the fact that it can be used at a professional level and in ordinary home conditions. If sharpening is carried out using a machine, you will need to purchase the appropriate abrasive wheels to match the parameters of your saw blades. But it is optimal for most owners of circular saws to use the home processing method. This is due to the fact that often it is not necessary to carry out a large amount of work, and all processing of the cutting edges is carried out with a needle file. To effectively sharpen a product, sometimes it is enough to make 4-5 movements with a high-quality needle file. This will give the teeth the required degree of sharpness.

Experience is a useful thing, thanks to which you can avoid a number of mistakes typical for beginners. Therefore, paying attention to the advice of experts is very useful if you want to achieve a positive result for yourself when turning a circular saw.

Always use safety glasses. For some reason, many people ignore this rule, which is why the masters themselves then suffer. Therefore, before you start sharpening, be sure to put on all the necessary protective equipment;
Do not attempt to remove more metal than required. Remove just enough to remove all existing cracks, burrs and irregularities;
During turning, be sure to keep the disk in a constant position;
If the disc has not been sharpened for a long time, you will have to remove a larger layer of metal;
Keep all teeth identical in shape and height.

Initially, it seems that sharpening is a technologically complex process. But with a little experience, you will be able to sharpen circular saw blades easily.

A circular saw is a device used to work with building materials. As a rule, wood is processed. A toothed disk is used as a cutting tool. Over time it becomes dull. Sharpening a circular saw blade is carried out both on a special machine and with your own hands at home.

Sharpening circular saw blades is required when the work becomes impossible. This can be understood by three signals:

Heating of the protective casing. Smoke appears from under it and leaves the cutting zone.
The need for additional effort when feeding the workpiece at the time of cutting.
When wood comes into contact with cutting metal, a burning sensation and smell appear.

Types of teeth

The main cutting element of the disc is the teeth. They are made from carbide material. A tooth consists of four sides: front, back and two sides. Also from the main cutting edge and two additional ones.

Teeth requiring sharpening are divided into:

Direct. Used for longitudinal sawing of blades.
Beveled. They have an angular cut on the back plane of the tooth. They can cut not only wood, but also plastic or chipboard.
Trapezoidal. In cross section, the cutting plane has the shape of a trapezoid. Thanks to this, they can be sharpened less often.
Conical. They have the shape of a cone.

Sharpening angles

A circular saw has four corners, which after dulling must be sharpened. These are the front and back angles. Also the cutting angles formed by the front and back surfaces.

Depending on the direction of sawing, they are needed. When longitudinal cutting, the rake angle ranges from 15 to 25 degrees. In the case of cross cutting, the sharpening angle is reduced to 5-10 degrees. If universal cuts are required, then the tooth is sharpened at an angle of 15 degrees.

The density of the material has an important influence on the angle. The lower it is, the more urgently the tooth is needed. If the material being processed is plastic, then the angle can be negative.

Sharpening circular saws with pobedit tips

It is not easy to maintain sharpening angles for circular saws with carbide tips because pobedite is applied to the tooth. This alloy is attached by soldering. The geometry of the cutting part is complex, and the sharpening parameters require precise control.

Work is carried out by smoothing the cutting edge to a radius of 0.3 mm. A greater value should not be allowed.

Sharpening is carried out on the front and back planes of the tooth. If the work is carried out correctly, then the total number of sharpenings until the blade is completely worn out will be 30 times.
You should start working from the front plane.
The part of the tooth that is soldered should fit snugly to the .
Turning time ranges from 3 to 5 seconds. Can't go any longer. This leads to excessive heating of the metal. It is overheated and tempered with a decrease in hardness.
The thickness of the material being ground is around 0.15 m.

Application of the machine

The simplest machine for working at home is represented by It is a motor with abrasive. The wheels can be diamond, CBN or silicon carbide.

It is difficult to keep the blade in a certain position relative to the abrasive. You need to use the tools. This can be a horizontal stand or a fixing device, where the upper plane must coincide with the axis of the abrasive.

The tooth to be sharpened is located on the plane so as to be perpendicular to the blade. After turning on the engine, the blade is brought to the circle and pressed against it with a tooth. The layer of metal being removed is regulated by the pressing force. Having finished working with one tooth, the next one is approached using the same method. And so on in a circle until the end.

For the purpose of universalization, the stand is being modernized. The front part is made movable, and a pair of bolts are screwed into the rear. With their help you can adjust the tilt of the canvas. It becomes possible to sharpen the front and back planes of an oblique tooth.

The problem remains of maintaining the same front and rear sharpening angles. To do this, it is necessary to fix the blade relative to the center of the abrasive wheel. To do this, the disk is inserted into a special mandrel, and a groove is made in the stand for it. The required value is maintained by moving the mandrel along the groove. If the diameter of the disks is different, then it must be possible to move the engine or stand with a groove.

Another way is to install stops that will fix the desired position of the disk.

Sharpening by hand

In the absence of a machine, sharpening can be done with a file. To do this, it is important to clearly fix the disk. This is done using a vice. If you do not remove the canvas from the circular saw, you can do without them. Bars are inserted between the teeth, and the tool rests on a vertical plane.

A mark is made at any point on the circle with a marker. This way it will be clear when the work is completed. Processing is carried out with a flat file that fits well between the teeth. The top edge of the tooth and its front face are subject to the greatest wear.

First, work is carried out on the rear surfaces of the teeth around the entire circle. At the second stage, they begin to sharpen the front edges. It is important to remember that the applied force must be the same, then all the teeth will be sharpened evenly.

It is possible to sharpen a circular saw disc at home. To do this, it is better to purchase a simple machine. In its absence, you can use a vice or homemade stops. After finishing work, check the tool. During the cutting process, its operation should be smooth and quiet.

During long-term use, carbide-tipped circular saws may lose their original qualities. But this does not mean that you should purchase a new cutting tool. In most cases, sharpening can be done at home using any suitable machine.

The need to sharpen the saw

First you need to decide whether you need to sharpen or not. There are several obvious signs indicating the relevance of this procedure. If you ignore them, then in the future the disk may become unrepairable and cause the failure of an expensive machine.

The advantage of using a tipped saw blade is that it will last longer. It is also designed for processing hard wood. Surfacing is made from steel 9ХФ, 50 ХВА, 65Г and similar compositions. They are characterized by high hardness, but at the same time, with significant use, the likelihood of their breakage will increase.

Timely sharpening of circular saws using a machine with your own hands is carried out with the following obvious signs:

increased load on the engine. The reason for this is the deterioration of sharpening and, as a result, the power unit needs more power to cut wood. If the engine design does not provide protective relays, it may fail;
deterioration in cut quality. The first sign is an increase in the width of the cut, as well as the formation of chips and irregularities along its edges;
increase in workpiece processing time. The cut takes longer than usual to form.

The best way is to periodically check the condition of the wood soldering disc. To do this, you will need to temporarily leave the machine and dismantle the cutting tool. If its geometric parameters do not coincide with the original ones, sharpening is necessary.

How to determine the sharpening angle of a circular saw

The best option would be to have an initial template according to which you can correct the geometry of the cutting edge. Often it is made of thin-walled stainless metal, less often - of thick cardboard.

Carbide teeth are manufactured in accordance with GOST 9769-79. But their geometry and geometric dimensions are determined by the manufacturer based on the purpose of the saw. If there is no template, you need to independently determine the required sharpening angles. To do this, it is recommended to use a pendulum inclinometer.

Do-it-yourself template making technology.

Take a new disc with soldering, which is completely identical to the dull one.
Draw precise outlines on a hard sheet of cardboard.
Using a pendulum goniometer, determine the initial geometry of the carbide tips.
Enter the data on the template.

In the future, it can be used for self-sharpening on a machine or provided as a sample for companies providing similar services.

Additionally, it is recommended to compare the obtained data with the reference ones. In rip saws, the rake angle is usually 15°-25°. For transverse models, this figure ranges from 5° to 10°. In universal models, the rake angle is 15°.

It is important to remember that the rake angle can be negative. Similar models are used for cutting plastic sheets and non-ferrous metals.

Methods for sharpening circular saws

Any sharpening machine can be used to form a new cutting edge. It is important to initially choose the right sanding wheel and use it to sharpen the edge. To do this, it is necessary to use corundum or diamond models.

The best option is to use special equipment designed to perform this work. But due to its high cost, in many cases its acquisition is impractical. An alternative method is to use a grinding machine with the ability to change the angle of the corundum disc.

Under no circumstances should you sharpen by hand yourself. Firstly, it will take a lot of time. Secondly, the result obtained will not meet the standards. If it is not possible to sharpen a saw blade for wood yourself, it is recommended to use the services of specialized companies.

Do-it-yourself professional sharpening of circular saws is performed according to the following rules:

the main deformation occurs at the upper edge of the tooth. The edges are rounded from 0.1 to 0.3 mm. It is from this place that processing must begin;
sharpening is carried out along the leading and trailing edges. This will ensure the possibility of repeating the procedure up to 25 times;
the removal amount should not exceed 0.05-0.15 mm;
The level of processing of the front and rear edges should be the same.

After sharpening the discs for wood is completed, it is recommended to finish it with fine-grained sandpaper. This can be done manually or using a special machine.

Experts advise using special corundum disks, the end surface of which has a specially shaped groove. It will make the procedure easier.

Ways to increase the service life of saw blades

The process of forming a new cutting edge is labor-intensive and time-consuming. Therefore, it is recommended to fulfill a number of conditions to increase the service life of the disk.

Hard solders have a long service life. However, they are more likely to chip and break off. Alternative soft is practically not susceptible to such defects. But its service life is shorter than that of a solid one.

The appearance of roughness on the cutting surface is not allowed. In the future, they can lead to chips and cracks.

The video shows an example of a do-it-yourself disc sharpening machine:

Drawings and tooth geometry

Sharpening of circular saws must be carried out strictly in compliance with the standards and requirements for the geometry of the teeth of each individual disk. To properly sharpen a circular saw with your own hands, you need to know the shape of the tooth and its geometry.

A circular saw (the modern name is a circular saw) is a much more effective tool compared to reciprocating, longitudinal and chain saws. The quality of the cut and ease of use are beyond doubt. Using a circular saw, you can perfectly evenly cut a large workpiece, make cuts at different angles and work with a variety of materials.

A circular saw allows you to cut material both along and across the fibers with the same accuracy and quality. Of course, you can get a clean cut only with properly sharpened teeth. Circular saws are divided into three categories:

All metal
All-metal with spraying of hard materials in the working area
Saws with tipped teeth made of hard alloys

The presence of technological grooves on saw blades is very important

To advance the workpiece during cutting, a lot of force is required
Chips and cracks appear on the cut
The drive motor gets very hot during operation
There is a smell of burnt material
Dark marks from overheating are visible on the edge of the cut

In addition, the sharpness of the teeth can be checked tactilely and using a magnifying glass. The rounding radius of the cutting edge should be within 0.1-0.2 mm. When sawing thick workpieces, not only the main working edge is subject to wear, but also the side ones.

IMPORTANT! When carrying out work, always use a blade that is suitable for the material. Otherwise, you will mistakenly send a working disc for sharpening.

General rules for sharpening a circular saw

Discs are sharpened a limited number of times. With each procedure, the size of the tooth decreases. Sooner or later, the tooth is ground down to a critical value, after which the use of the disc becomes impossible.

IMPORTANT! It is unacceptable to work on a dull disk. In addition to deteriorating cut quality, sharpening excessively dull teeth will require more metal to be removed.

In order to extend the service life, sharpening is carried out on two working surfaces of the cutting edge. In this case, the thickness of the removed surface is halved.

Schematic illustration of proper tooth sharpening

If you do not violate the processing rules, sharpening can be done up to 25 times. Before sharpening, the disc must be cleaned of dirt. Mechanical processing is undesirable; it is better to use washing liquids containing solvents. The standard amount of tooth surface removal is 0.05-0.15 mm.
Sharpening angles are individual for each disc, and are indicated in the passport or directly on the sidewall.

Marking of the saw blade indicating sharpening angles

For sharpening discs, there are special ones that mechanically control the selected angles for each tooth. Depending on the intensity of use, the sharpening machine may have an automatic or manual drive. At home, as a rule, inexpensive models are used in which turning the disk to the next tooth and controlling the thickness of the metal being ground is done manually.

In such devices, the disk is fixed perpendicular to the grindstone, and the angle and pitch of the tooth are set. The master passes the sharpened surface over the whetstone a fixed number of times and moves on to the next tooth.

Sharpening discs are made of CBN, silicon carbide or use diamond sputtering. It makes no sense to talk about the fundamental advantage of one material over another. There are only specifics of application. For example, diamond sharpening stones can handle harder teeth but are sensitive to overheating.

You can sharpen it manually using a high-quality file. It is better to leave the disk in the machine. The first tooth is marked with a marker, the disc is fixed using wooden blocks, a clamp or a vice. A fixed number of file passes must be made on each tooth surface. Then rotate the disc by one tooth and repeat the procedure.

How to sharpen a circular saw with your own hands video

Sharpening carbide-tipped discs

Many home craftsmen are faced with the problem of sharpening discs with pobedit tips. If you sharpen with standard abrasives, you have to carry out the procedure longer, and the material may “release” from overheating. Diamond sharpening discs do a much better job, but they are too expensive. Sometimes it is more profitable to buy a new Victory disk.

The choice is up to the saw owner, but the general advice is as follows:

When sharpening disks with pobedite tips, you will have to use a machine in any case, regardless of its technical level. If you have such a machine, purchase diamond abrasive and sharpening discs of any hardness will not be a problem. If you don’t have a machine, it’s better to go to a specialized workshop to sharpen discs with pobedit tips.

You can spend money on purchasing equipment of any complexity, the main thing is that it does not stand idle and is in demand. For large volumes of work, it is more profitable to have your own sharpening machine for circular saws. If you only perform periodic repair work, it is cheaper to contact a workshop.