An easy way to sharpen circular saw blades. Sharpening machine for circular saws: do-it-yourself assembly, device and sharpening rules

A saw blade is always useful in construction. The circular saw is convenient because it allows you to quickly cut the material with minimal effort and time. As for the quality of the cut, we can say that it is perfect, but only when the saw is in good condition and well sharpened. Otherwise, working with such a tool is even dangerous, so you should sharpen the saw blade.

It is not difficult to determine the need for a sharpening operation: a blunt tool cuts the workpiece poorly, which immediately catches the eye. There are two options here: either give the disc to the workshop, which is not always profitable in terms of time and money, or sharpen the saw blade with your own hands. This may seem complicated at first glance. But if you delve into the essence of the saw device in more detail, it will not be difficult to perform tool maintenance at home.

There are quite definite signs by which one can judge the condition of the instrument. Saw sharpening is necessary when the following is evident:

During operation, smoke arises, a specific smell of burnt wood, the casing covering the saw teeth begins to heat up quickly.
When moving the tool along the workpiece, it is necessary to apply significant efforts, as if to push the saw forward.
After cutting the material and visual inspection of the sawn edge, black soot or many chips, fiber scuffs, chipped areas are visible.
A close examination of the saw teeth through a magnifying glass shows that the cutting parts do not have sharp, but rounded edges.

All this requires an immediate cessation of work, otherwise there is a high risk of damage to the material and wear of the saw blade to such a state that sharpening will no longer help it.

The main angles of sharpening circular saws

The tooth of a circular saw, which is usually made of carbide metal, has a complex structure. It has three cutting edges as standard, so you need to sharpen the teeth in such a way as to sharpen these edges. But the main thing when sharpening is to observe the angles at which the tooth planes diverge from the edges, and the angles of attack between the tooth plane and the workpiece. The last point is important for maintaining the characteristics of the saw blade.

The front edge, the one that first cuts into the workpiece in the direction of the saw, forms the main cutting edge with the back edge. The angle at which the rake face meets the material is called the rake angle Y (angle of attack). The angle between the back face and the front face is the taper angle. If you subtract the front angle and the taper angle from 90 degrees, you get the back angle.

In practice, it is important to observe these angles when sharpening for each type of disc. It is according to the front angle that the saws are divided into types:

Longitudinally cutting, where the rake angle should not go beyond 15–25 degrees.
Transverse cutting, where it is permissible to sharpen the front edge of the tooth at an angle of 5–10 degrees.
Universal discs, which are quite easy to cope with both longitudinal and transverse cuts, their front angle must be maintained in the region of 15 degrees.

The angle of the bevel of the rear and front planes is also important: the sharper it is, the easier it is for the saw to enter the material, but wear occurs faster.

Follow the rules! When sawing hardwoods, saws should be sharpened in such a way that the sharpening angle and bevel angle are as small as possible (within acceptable limits). This increases the life of the disc until the next sharpening.

Types of wiring of teeth of a circular saw

Before sharpening a circular saw, you need to check if there is a set of teeth. To do this, measure the width of the tooth with a caliper, and then make a small cut in the hardwood blank and measure its width. If the circulation disc is set apart, then the cut should be wider than the tooth. Otherwise, the saw teeth must be set before sharpening operations are carried out.

The complexity of the wiring process is due to the need to move the teeth to the side at the same distance. This can be achieved by using the factory fixture for wiring circular saws. Each tooth must be started from the middle of its size. For wood materials of different density, the degree of setting of the teeth should be different, but, without going into details, we can say that they are bred wider for sawing soft rocks than for hard ones.

There are three main distribution methods:

Cleaning type wiring. This method boils down to the fact that the tooth after two remains in its place without change, the rest are deflected in different directions. This saw preparation is good for working with solid wood.
A variant of the classic wiring, when the saw teeth alternately move to the right, then to the left. This universal method can be applied to almost all types of saws.
The so-called wavy wiring, the distinguishing feature of which is the removal of the teeth not at a strictly defined distance from the center, but at different distances with a deviation of 0.3–0.7 millimeters.

General rules for sharpening a circular saw

To sharpen discs for a circular saw, it is necessary to prevent their strong wear, namely, the rounding radius of the cutter should not be more than 0.2 mm. The following basic rules are followed:

First of all, the main faces are processed, of which the front one wears out more.
In extreme cases, with severe wear of the side faces, they are corrected.
At one time, no more than 0.15 millimeters of the thickness of the saw metal is removed.
When finishing the edges with an electric tool, overheating of the metal is not allowed, in which case its properties deteriorate.
To ensure the maximum life of the saw, when it can be sharpened up to 30 times, both edges should be sharpened: both the front and the back, removing the same amount of metal.
It is not allowed to sharpen circular saws with tools not intended for this, for example, a grinder and a metal cutting disc.

After the basic sharpening operations, you can refine the teeth with fine sandpaper. The quality control of tool sharpening takes place under working conditions. If everything is in order, the cutting of the material will be clean, smooth, without visible defects and blackening.

How to sharpen a circular saw

Sharpening discs is impossible without the use of a special tool. For these purposes, you can use:

Special wheels for sharpening saws, made on the basis of diamond abrasives.
An ordinary file for sharpening a saw, but you also need to have a vise to secure the saw and a wooden block to use as a guide.
Processing on professional equipment is the fastest and most high-quality way of sharpening, but it requires large material costs for the purchase of a tool.

Do-it-yourself saw sharpening at home

Attention! To sharpen circular saws with your own hands, it is advisable to have certain skills in sharpening tools. If there are none, at least practice on emery, sharpening a regular knife.

When working with a disk, the main thing is not to spoil the cutting surface, and this can easily happen if the hand trembles, the feed angle is disturbed. To avoid negative consequences, you should study the methods of sharpening, and then everything will turn out right. There is a manual method of restoring the cutting elements of a circular saw and a method using grinding equipment.

Manual way

You can sharpen the teeth yourself manually with a file, so that it is of high quality, if they do not have a bevel, that is, the surface of the front face is perpendicular to the surface of the blade. The process looks like this:

From dense wood, a bar is harvested with a cross section of about 50x50 mm and a length of 100 mm. The sides of the bar should be strictly perpendicular to each other.
Mark with a marker any tooth that will be reporting and the first in processing.
The saw blade is clamped in a vice together with the timber in such a way that the front edge of the element being processed is flush and in the same plane with the surface of the timber (the timber in this case acts as a guide for the file).
A thin file (its thickness should allow it to freely fit into the cavity between adjacent teeth) is applied to the surface of the tooth to be treated and at the same time to the bar and with methodical movements back and forth, sharpening is carried out.
So each tooth is gradually sharpened, monitoring the condition of the beam and, when working out its surface, slightly shifting the plane.

Use of machines

With the help of a special machine, circular saws are sharpened very easily and quickly. The main thing is that there is no need to monitor the angle of the disc feed. Having set it once, the operator only has to move the teeth into the processing area and make light clamps of the tooth plane against the rotating diamond disk.

On such equipment, it is possible to sharpen carbide-tipped saw blades and conventional saw blades. The simplest machine for grinding operations of circular saws has the following structural elements:

An electric drive with a grinding disc attachment system is a stationary part of the equipment.
The stand, which moves along the guides, is its task to feed the saw blade into the processing area.
The saw blade holder on the stand, which is designed to keep the blade in the same position when it is fed to the grinding wheel.

Pay special attention! Discs with different types of teeth require an individual approach to sharpening. With a beveled location of the front face, its supply to the processing area is performed at an angle to the horizontal, for which one edge of the stand is raised accordingly.

If you have additional questions on the topic of sharpening saws or you have your own experience in carrying out such operations, respond in the comments! Your comments are important to us!

Any cutting tool tends to become dull during operation. This also applies to carbide saw blades, which must be sharpened regularly in order to cut wood quickly and efficiently.

The easiest way to sharpen teeth on a circular saw is to use a regular file. But when working with your own hands, on bringing the cutting tool into working condition, there are many difficulties that only a good specialist with a fairly extensive experience can handle. It is much easier, faster and more efficient to use a homemade circular saw sharpening machine or a circular knife sharpening machine for this operation.

If there is a home-made electric sharpening machine for circular saws, regardless of whether it is a factory tool or home-made, you should know the basic principles for using such equipment. Especially when there is a need to sharpen the teeth of saw blades that have different geometry and sharpening angles.

1 Tooth shapes on saw blades

There are several of them, and they appeared as a result of optimization impact of the cutting edge on the material being cut, which can have different properties.

The main tooth shapes are:

straight - used for longitudinal sawing, when high quality is not necessary;
oblique (beveled tooth) - has a variable right and left angle of inclination of the posterior (sometimes also anterior) plane. It is used for sawing both in the longitudinal and transverse directions. The most common shape for circular saws. This configuration is convenient to use when cutting boards with double-sided lamination, as it does not give chips along the edges of the cut;
trapezoidal - characterized by a long period of retention of the cutting edge in a sharp state. Usually on saw blades, teeth of this shape alternate with straight teeth, somewhat rising above them. Trapezoidal teeth, in this case, make rough sawing, and straight teeth - fine;
conical - this form of teeth is used in auxiliary operations. For example, a layer of laminate is cut to prevent the appearance of splinters during the main sawing.

The front edge of all teeth is flat, but in some types of circular saws it is concave.

This allows you to perform high-quality finishing cross-cutting.

1.1 Sharpening angles

Sharpening of the teeth of a circular saw is carried out taking into account the four main angles that are formed at the intersection of the planes:

front corner;
back corner;
bevel angles of the front and rear planes.

as a helper, the angle of sharpening is also taken into account, which is given by the front and back angles.

Sharpening angles depend on the purpose of the saw:

for longitudinal sawing, a rake angle of 15 to 20 degrees is suitable;
with cross sawing - from 5 to 10 degrees;
with universal use, on average - 15 degrees.

Sharpening angles are important to take into account not only in the direction of the cut, but also in terms of the hardness of the wood - the harder it is, the smaller the front and rear angles should be.

2 Equipment for sharpening saw blades

These are grinding machines for circular saws, which constructively made in the following variations:

when sharpening, only the saw moves (the engine with the grinding wheel is stationary);
both a sharpened saw and an engine with a circle can move;
only the motor with the grinding wheel attached to it moves (the saw blade remains stationary).

As a standard example of a grinding machine, a device can serve as a device that consists of two components - an engine with a grinding wheel mounted on its shaft, and a caliper on which a sharpened circular saw is attached.

To ensure angular sharpening in this device, a system must be provided that allows you to change the angle of inclination of the blade (for teeth with a beveled front plane).

2.1 Machine JMY8-70

The JMY8-70 electric grinding machine, which is made in China, has a fairly large number of positive reviews. Some craftsmen take his device as a basis when they assemble a home-made machine for their own needs with their own hands.

The JMY8-70 machine is designed for sharpening circular saw blades that made of hard high-speed alloys. On the machine, it is possible to process the front and rear plane of the teeth, as well as to perform angular sharpening.

Main advantages:

has a diamond grinding wheel, the diameter of which is 125 mm;
equipped with an inclined saw holder, which allows for angular sharpening;
the body is made of cast steel used in the aviation industry;
installed on rubber pads, which significantly reduce the impact of vibration on the material being processed;
It has a simple adjustment that even a non-specialist can handle.

The manufacturer upon shipment completes the machine with a detailed instruction, which describes in detail all the possible functions of the device and how to perform them.

Specifications:

the grinding wheel has dimensions - 125 × 10x8 mm;
the grinding wheel can be rotated up to 20 degrees;
diameter of the sharpened saw — from 70 to 800 mm;
grinding wheel rotation speed - 2850 rpm;
weight - 35 kg.

2.2 Homemade grinder

A lot of people, when working with their own hands, use carbide circular saws not regularly, but from time to time. Therefore, buying factory equipment does not make economic sense. A homemade grinding machine is a great solution that will allow you not to contact third-party organizations.

The main argument is that when sharpening a circular saw on a conventional grinding wheel with your own hands, it is very difficult to maintain the required sharpening angles. Therefore, a device is needed allows you to fix the saw blade in a specific position in relation to the grinding wheel.

A home-made machine, on which you can sharpen circular saws with your own hands, may consist of the following components and parts:

a fixed electric motor with the possibility of mounting a grinding disk on its shaft;
table-stand, the surface of which is located at the same level in height with the axis of rotation of the grinding wheel;
tilting the stand with hinges on one side and rotating (height-changing) screws on the other. This will allow you to perform angular sharpening along the front and rear planes;
clamps to secure the saw blade. To do this, a groove is made on the surface of the stand for the mandrel on which the saw is installed. The movement of the mandrel, along with the disk, along the groove will allow you to maintain the required angle of sharpening the teeth;
a device for moving an electric motor or a stand for angular sharpening of circular saws with different diameters;
the presence of stops for reliable fixation of the tool during work.

2.3 Sharpening circular saws

The sequence of operations when sharpening the front plane of the tooth of a carbide saw blade:

the saw is placed on the mandrel and fixed with a conical sleeve with a nut;
it is set clearly horizontally using a pendulum goniometer, while the bevel angle of the front plane is equal to zero;
moving the mandrel horizontally with the disk installed, the specified front angle of sharpening is set. In other words, the disk moves in such a way that the front plane of her tooth fits snugly against the surface of the grinding wheel;
using a marker, a mark is made - from which tooth sharpening began;
when the electric motor is turned on, several movements of the saw are made back and forth with pressing the surface to be sharpened against the working surface of the grinding wheel;
the thickness of the metal removal is regulated by the clamping force and the number of translational movements;
after the first tooth is sharpened, the saw is removed from contact with the grinding wheel and rotates around its axis by one tooth, which will be the next when sharpening;
the operation is repeated according to the number of teeth on the saw blade.

The use of disk elements has found distribution in many areas of industry, so the machine for sharpening circular saws has become widespread. The main requirement for such a tool is the high quality of cutting materials. Sharpening is not such a simple task as it might seem at first glance. In this case, you can not do without special equipment. The following indicators affect how difficult the operation will be:

What material is the item made of?

Saw diameter size;

Angle of inclination and shape of the tooth.

Machine

A sharpening machine is not just one device. So you can call a large group of equipment and tools for special purposes.

According to the method of production, they are divided into two groups:

Automatic. The whole process of sharpening is completely mechanized and there is no need for human participation. Such devices are used for industrial purposes.

Manual. It can be any fixtures and tools for sharpening by hand. The performance of such equipment is much lower than automatic machines. This type has found application in handicraft workshops for domestic needs.

Equipment of this kind is on sale in a wide range, the devices may differ in functions, power and price. A manual machine for sharpening circular saws, the price of which will be much lower (about 20 thousand rubles), can be made independently. The equipment consists of dense and hard alloy plates that serve as cutters.

Plates for them are made from alloys of various compositions.

They have different tooth configurations. The strength will depend on which alloy is used. Not the last role is played by the grain size of the alloy. It should be smaller to give strength and hardness to the product. Usually such hard alloys are obtained from cemented cobalt. Therefore, it is so important that the equipment is exactly the machine for sharpening carbide saw blades.

Differences in insert teeth

The tooth of hard alloys has four main planes for work: front, back and side (auxiliary). When the planes intersect with each other, cutting edges are formed: the main and a pair of auxiliary ones.

The shape of the teeth is as follows:

Straight. The use of this form will be justified when a longitudinal cut is required, fast in time and not mandatory in terms of quality.

Oblique or oblique. The angle of inclination of the back form in this case can be right or left, they alternate with each other. This configuration is the most common. Sharpenings of various sizes serve to work with different materials in any direction.

By changing the size of the bevel angle in the direction of increasing, you can increase the cutting and reduce the likelihood of chipping, but this will lead to a decrease in the strength and durability of the tooth itself. It is also possible to tilt the front part of the plane of the element.

Trapezoidal. This tooth dulls the edges more slowly than the beveled one. Alternate it with a straight line. At the same time, the rough cut was made with a longer trapezoidal cut, and the finishing cut was made with a short straight cut.

Conical. This form of teeth performs a rough cut of the lower edge of the boards, while the upper one is protected from chipping. Basically, the front face of such an element is flat. But if you make it concave, then it is possible to use this device for cross cutting in the final version.

Sharpening angles

The basic angles are those determined by the shape of the teeth. This is the front and rear, as well as the bevel along the front and rear planes.

The size of the angle is also determined by the hardness of the cutting material.

With high hardness, it is made less. The front cutting angle is available in a negative version. This finds application in non-ferrous metals and plastics.

Prices

You can buy a machine for sharpening carbide saw blades at a cost of 15,000 rubles. You can fork out for more expensive devices. For example, PP-480Z will cost its owner 280,000 rubles. Prices vary and depend on the purpose of the device, its functions, power and performance. For a small workshop or home use, you can purchase a JMY8-70 circular saw sharpening machine. Its cost is within 18,000 rubles.

Sharpening rules

The main wear of the saw teeth occurs on the upper edge, which is directly involved in cutting. Its rounding can be 0.3 mm. The center face changes first.

The wear of the saw should not be allowed to be significant. The edge can be rounded no higher than 0.2 mm. A saw that is duller than this value is harder to sharpen. This will take longer than normal wear tools. The degree of wear is determined either by the type of cut or by the teeth.

We must not forget how many sharpenings are produced as much as possible. This value is located within 30-35 times. To achieve this result, both surfaces are processed at once.

The machine for sharpening circular saws allows you to work in only one plane. And then it will be reduced by about 2 times.

Before starting work, clean the working disk from dirt, and also measure the angles of inclination. Preparation for sharpening is carried out from the front of the tooth. The metal layer that can be removed is 0.20 mm.

If abrasives are used during sharpening, then they must be cooled with a liquid of a special composition (coolant). For better quality and lower specific gravity, it is better to choose a wheel with a high grit size.

Notches and irregularities should not be allowed, even if it is a home-made machine for sharpening circular saws. They can lead to untimely exit from work and crumbling of the metal.

Artisanal

It will not be difficult to sharpen yourself. Especially if you have the necessary equipment. And if not, then you can make it yourself. It is possible to make a machine for sharpening circular saws, the price of which will only please, from simple parts. To do this, you will need the following basic elements:

Engine;

Caliper;

Tilt mechanism;

Stop screws.

The circle is fixed on the engine, the disk blade - on the support, while the screws will ensure the movement of the workpiece along the axis of the circle, which will provide the desired angle.

The main task for such an element as a machine for sharpening circular saws is to fix them in the required position relative to the circle. This is necessary for the exact observance of angles, this can be ensured by a stand mounted on the frame of the machine in the same plane with the circle.

When the disc is placed on a stand, the teeth must be perpendicular to the plane of the saw machine.

The stand does not have to be made stationary, if necessary, you can make it floating, for this, screw the hinge on one side, and hook the second part to the frame rigidly with bolts. On a structure of this type, you can easily turn the disk of the apparatus to the desired angle and carry out work in a given plane.

Difficulties at work

When using circular saws for sharpening, you may encounter the difficulty associated with the formation of incorrect angles. To eliminate such a defect, it is necessary to fix the center of the saw in the required position relative to the circle. A groove made on a stand can solve such a problem. It will help straighten the saw. There is an easier solution - to make stops in the working surface that can fix the device in the correct position.

Exploitation

Before starting the independent manufacture of this unit, you need to consider the drawings of the machine for sharpening circular saws. You can calculate them on your own, or you can turn to a professional. In any case, in order to understand all the subtleties of the future device, one cannot do without a preliminary paper version. If you have the necessary knowledge, then you can cope without contacting the master.

After the implementation of the future machine on paper, it will become clear what tools and materials will be needed in the process, what is already there, and what needs to be purchased.

A do-it-yourself circular saw sharpening machine has a great advantage in terms of price over the factory unit. It also does not require any special skills to work.

Sharpening without a machine

You can sharpen a saw at home without the help of a machine. But at the same time, you should not hold it manually, sharpening it on. For the correct operation, the effort of the hands will not be enough, and the eye will not be able to align the desired angle. To simplify the task, you can use some kind of fixation device; for this purpose, a regular flat delivery is useful. In this case, the axis of the grinding disk must coincide with the surface of the stand. And the circle, in turn, should be placed perpendicular to the saw. If necessary, to make corners, the structure is made movable with the help of hinges. But here there is a difficulty in maintaining the same angle of front and rear sharpening. To avoid this, rigid fixation of the saw wheel in relation to the abrasive disc will help. This can be done by using a mandrel groove or by attaching stops to the stand, which will allow you to secure the corner.

Conclusion

Like any tool, a circular saw needs proper use and care. Compliance with the technology will increase the service life of the product.

So, we figured out how to make a machine for sharpening carbide saw blades. To do this, you will need quite a few materials, as well as some skills and a desire to make a useful thing with your own hands.

For sawing wood, a specialized power tool is used, as well as toothed discs, which become dull over time and do not cope with their tasks. In order not to have to buy a new cutting nozzle, do-it-yourself sharpening of circular saw blades is done. The principle of sharpening is not difficult, and everyone can cope with this if they have instructions for implementing this process.

How to know when it's time to sharpen a disc

Cutting discs for processing wood and wood-based materials wear and tear over time, which contributes to a decrease in their productivity. To restore the effectiveness of the cutting tool, you will need to sharpen the teeth. You can find out that it is necessary to sharpen the teeth on the disk by the following factors:

To cut wood, it is necessary to exert pressure on the tool against the workpiece being cut.
There is smoke coming from under the protective cover
Protective cover overheats
There are signs of a burning smell. This means that the teeth do not saw wood, but cut it.

The operation of a faulty nozzle on a power tool leads to a decrease in the productivity of work, and also increases the likelihood of an early failure of the power tool and the nozzle itself. A decrease in performance contributes to an increase in the load on the electric motor, which eventually begins to overheat and fail.

What teeth are on the cutting nozzles

At the heart of any cutting device are teeth, the quality of sharpening of which affects efficiency and productivity. The teeth on the nozzles are made directly from carbide materials. To increase the service life, soldering from Pobedit is applied to the teeth, which allows extending the life of the working nozzle by 5-6 times.

The number of cutting teeth on a wheel depends on its diameter. The teeth consist of a front and back part, which differ in design, as well as a side part. Teeth in appearance (geometry) are classified into the following types:

Straight - a type of teeth used for longitudinal cutting of sheet material
Trapezoidal shape - the cutting links have a trapezoid shape, which is an advantage - they rarely need to be sharpened
Beveled links - the most common type of teeth, which is characterized by the presence of an angular bevel on the back or front. This design allows you to cut not only wood, but also other types of materials such as fiberboard, chipboard, plywood and even plastic.
Conical - they look like a cone, but their main drawback is that they dull quickly, so they need frequent sharpening. They are used not only for transverse, but also for longitudinal sawing of sheet material.

Manufacturers also produce circular saw blades with active and passive links. Depending on the type of teeth, the process of sharpening them differs. To properly sharpen the teeth on a circular saw, you will need to correctly determine the angle of their sharpening.

Choosing the angle of sharpening cutting teeth

The links on the cutting attachments have a working area that has an appropriate sharpening angle. Depending on the type of teeth, the disc can be used both in one sawing direction and in two. When the links are blunted from one part, then the disk must be deployed and continue working in the opposite direction. However, this can not be done with all circular discs, for example, circles with beveled links are not suitable for this.

If you sharpen a circular saw blade with your own hands, then you need to understand that, depending on the direction of the cut, you need to take into account the angle of sharpening.

If you plan to cut wood in the longitudinal direction of the fibers, then the sharpening angle on the links should be 15-25 degrees
If the wood is sawn in the transverse direction, then the sharpening angle is reduced to 5-10 degrees
The universal sharpening angle is considered to be 15 degrees. Circles with such links can be sawn not only across, but also along

When sharpening teeth on saw wheels and discs for circular saws, grinders and circular saws, one more important factor must be taken into account - this is the density of the material being cut. The lower the density, the higher the sharpness of the tooth should be. If a circular saw is used for sawing plastic or plastic, then the sharpening angle of the blade must be negative.

How to sharpen a blade on a circular saw with victorious soldering

Often craftsmen buy circles that have increased resistance to wear due to the presence of special soldering from Pobedit. These solderings extend the life of the consumable, but do not make it eternal. Pobedite layer is applied to the links using a special soldering. Due to soldering, the geometric shape of the tooth becomes more complicated, and therefore the sharpening process also becomes more difficult. Restoring the sharpness of the teeth must be carried out taking into account the exact shutter speed.

To sharpen the teeth on a carbide-tipped blade, it will be necessary to smooth the cutting edge to a value of 0.3 mm. To perform high-quality sharpening of carbide-tipped teeth, experts recommend using special equipment for this, as well as grinding wheels with diamond coating. If you use an abrasive wheel, it will quickly be erased before the soldered disc can be sharpened.

When restoring the sharpness of the links, the following factors are taken into account:

Sharpening saw blades must be performed not only on the front, but also on the rear plane. Start directly from the front
When sharpening, the winning soldering should be in close contact with the grinding diamond wheel
The contact time should be no more than 5 seconds. It is necessary to take into account the time in order to avoid overheating of the metal. If the metal is overheated, then it will harden, as well as a decrease in hardness.

When sharpening, it must also be taken into account that the thickness of the material being ground off should not be more than 0.15 mm. If the procedure is performed correctly, then at least 30 sharpenings are carried out until the disk with victorious soldering is completely worn out.

You need to decide on the rationality of restoring the sharpness of soldered discs yourself, since the cost of a diamond-coated grinding wheel is sometimes more expensive than driving electrical equipment.

How to sharpen a disc with a machine

To restore the integrity of the cutting discs, two methods are used - manual and automated. The manual method is not only difficult to perform the procedure, but also takes a lot of time. That is why it makes sense to buy a grinding machine for saw blades or to make the device yourself.

A simple tool for sharpening saw blades is a sharpener or emery machine, on the shaft of which you need to fix a special circle - diamond, elbor, and also from silicon carbide spraying. The complexity of the implementation of the process is that the tool to be sharpened must be fixed in a fixed position, so it is not recommended to hold the disk in your hands when sharpening it. This is not only dangerous, but also contributes to a decrease in the quality of sharpening.

This is interesting! Before proceeding with the implementation of work, it is necessary to clean the surface of the tool being sharpened from soot. To do this, you can use kerosene, diesel fuel or industrial cleaners. If you do not clean, then the performance of the nozzle can be restored to 75% -80%.

Instructions for the correct sharpening of cutting discs for circular saws:

Each tooth to be sharpened must be perpendicular to the blade.
The principle of sharpening is that each tooth of the disk must be brought to the rotating blade (diamond wheel).
The amount of the removed metal layer depends on the magnitude of the pressing force. The greater the wear or wear of the teeth, the stronger the tool should be pressed against the blade.
The procedure is carried out in a similar way for each link.

To sharpen discs from circular saws, it is not necessary to buy special equipment for this. You need to attach a stand to the home grinder, which consists of a fixed and movable part, as well as a mount. With the help of such a device, you can easily and quickly perform sharpening at home.

The task becomes more difficult when it is necessary to maintain the appropriate sharpening angle. To modernize and expand the functionality of the installation, you will need to make a tilt controller for the movable stand. Bolts with nuts are used as regulators, due to which you can set the required angle of inclination of the stand.

The movable stand is a square frame, in the center of which there is a latch for installing the disk. The retainer has the same diameter as the tool being sharpened. A groove is made in the stand through which the required sharpening angle is maintained. It is not difficult to perform sharpening work, therefore, with frequent work with wood processing with a circular saw, it is necessary to make a sharpening machine.

How to sharpen a disc manually with a file

If an emery machine is not available, then the procedure can be performed manually. The principle of sharpening is that the disk to be sharpened should be fixed in a fixed position. For this, a vise or a clamp is used. When the equipment is fixed, all that remains is to pick up a marker and mark the starting point for work. Next, the file is used for sharpening.

A flat file is recommended, but a triangular one will work as well. The main requirement for a file is a free entry between the teeth.
The front and top of the tooth is heavily worn, so this wear should be restored
At the initial stage, the back surface of the teeth is restored, and then the front
When sharpening, you need to apply the same effort. In addition, the size of the teeth, or rather their size, should be the same

It is much more difficult and longer to perform sharpening work by hand, so this method is rational only in one case, if you do not often work with a circular saw. If tool work is often performed, then it is rational to buy an emery machine and make equipment from it for sharpening circular saw blades.

Making a machine or how to make a jig

equipment for sharpening saw teeth is called a jig. It is based on an electric drive that drives an abrasive disc - a cloth. The second part of the conductor is the mounting part, consisting of a movable and a fixed part. Before you start grinding work, you will need to make a jig. Consider two options for the manufacture of conductors.

Option 1 - making a simple grinder from a grindstone

The first option for manufacturing the simplest grinding equipment has the following form:

For the manufacture of such a device requires a minimum of time and cost, and the efficiency of its use is 100%. Video details:

Option 2 - how to make a grinder from a grinder and a drill

In addition to the emery machine, you can use a grinder or angle grinder to make a contactor. The spindle of this tool is equipped with an appropriate diamond sharpening disk, and the power tool itself is fixed to the base. The manufacturing principle of the conductor is as follows:

A frame is taken from chipboard or fiberboard measuring 50x80 cm. Composite parts will be located on this frame
Initially, you should fix the angle grinder motionless with clamps. The tool spindle must be at right angles to the frame
From the end of the tool, a movable frame is made and located, on which disks for sharpening will be installed
The mobility of the frame is realized through the use of furniture slides
A bracket is made on the frame for fixing the sharpened equipment

The finished product is shown in the photo below.

How to use, as well as the features of working on a home-made machine for sharpening equipment for circular saws, is shown in the video.

The result of the work done is the following - restoration of the integrity of the disk with teeth, which allows you to continue working with power tools when processing wood. The considered methods in the material are suitable for sharpening saw blades of tools such as grinders, circular saws and stationary circular saws. If the principle of performing work is clear, then there will be no difficulties with the manufacture of a special machine and its operation.

Sharpening of circular saws is a mandatory measure during the operation of this equipment. Woodworking requires the master to have tools with the appropriate cutting properties at his disposal. Like sharpening chainsaw chains, circular saws require increased attention. If the shortcomings are not eliminated in time, over time the tool will begin to dull much faster.

Saw sharpening is a common activity, as is do-it-yourself chainsaw chain turning. You can entrust the device with hard-alloy, victorious soldering to specialists. This is due to the fact that pobedit solderings have increased hardness, which is why it is impossible to sharpen with an ordinary file. This will require an expensive diamond grinding tool.

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

The temperature on the engine cover of your saw blade has begun to rise significantly.
To cut the workpiece, you have to make more physical effort with your own hands. A similar phenomenon is typical for blunt chainsaw chains.
From time to time, smoke may come out of the engine.
When processing blanks, 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 around the machine in jerks, although during normal sharpening the movements should be smooth.
During the operation of the machine, extraneous noise is observed.
The tooth geometry of the saw blades of your circular saw is broken.

General sharpening rules

Photo ways to sharpen circular saws

As in the case of sharpening chainsaw chains, self-sharpening requires adherence to certain recommendations.

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

Sharpening methods

You can use a saw sharpener or hand tools.

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

Sharpening happens:

classical;
full profile;
Sharpening the edges of the teeth.

We will tell about each of them separately.

classical

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

Sharpening starts from the back of the disc.
The front part, running on the material during cutting, remains in its unchanged position.
Processing can be carried out directly on the circular saw or the saw blade can be removed by placing it in a vise.
If you sharpen on a circular, be sure to unplug the machine from the power supply.
To fix the disk, use a pair of bars that will secure the circle like wedges. The bars should be tightly pressed against the product in order to prevent its movement during turning.
With a felt-tip pen, mark the first tooth where you will start.
Perform a certain number of movements on the first tooth with a grinder. Remember their number.
For all subsequent teeth, repeat movements similar in number and intensity.
Upon completion of sharpening, be sure to check the performance of the saw updated with your own hands. If there is no extraneous noise, vibrations and the disk machine behaves stably, you managed to do the job correctly.

Alternative Solutions

Alternative sharpening methods include the two methods that we described above. They are quite effective, therefore they are often used by masters.

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 grinding machines are used for full-profile sharpening. A special circle is selected in size and in one go passes the entire cavity between the teeth of the disc, while capturing the surface of the adjacent cutting edge. This technique of turning saw blades avoids the possibility of deformation of the tooth circle. The only downside to the sharpening method is that you will need to use the appropriate different wheels to process saws of different profiles.
Teeth edge turning. The popularity of this method of turning circular saw tools is due to 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 that 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 required 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 the product, sometimes it is enough to carry out 4-5 movements with a high-quality needle file. So the teeth will acquire the necessary degree of sharpness.

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

Always use safety goggles. For some reason, many people ignore this rule, because of which the masters themselves suffer later. Therefore, before starting sharpening, be sure to put on all the necessary protective equipment;
Do not attempt to remove more metal than required. Remove only enough to remove all existing cracks, burrs and bumps;
During turning, be sure to keep the disc in the same position;
If the disc has not been sharpened for a long time, you will have to remove a larger layer of metal;
Observe the identity of all teeth in shape and height.

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

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