How to sharpen a circular saw blade

How to sharpen a saw blade for wood? — Metals, equipment, instructions

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

Any disc must be sharpened with high quality, and the teeth must be correctly set. Dull teeth impair the quality of the cut, increase the load on the drive and make work unsafe. In addition, disks intended for working with hard materials must have technological grooves. Otherwise, when heated, the sheet may become deformed due to the expansion of the metal. This will lead to dangerous vibrations and poor cutting quality.

Differences in working teeth by geometric shape

The tooth has several working planes. The front plane “A” together with the rear “B” at the intersection form the main cutting edge “1”. At the intersection of the plane's thin lines with the side "B" auxiliary edges "2" and "3" are formed.

Schematic representation of a blade cutting edge

To effectively work with materials, various types of cutting teeth have been developed.

1. Basic shape – straight tooth

Designed for rough and fast cutting. The cut quality is low, so it is not suitable for fine work and jointing of hard materials.

2. Beveled teeth

This shape of the cutting edge allows you to make smooth, precise cuts and is well suited for composite materials, for example, chipboard with double-sided lamination. There are practically no chips left on hard surfaces. Teeth with a beveled back surface are excellent at cutting hard workpieces, but at the same time they become dull faster. The slope alternates, so a canvas with this shape is called alternately beveled. Both the trailing and leading edges can be beveled.

3. Trapezoidal teeth

The main advantage is slow dulling. Such working teeth alternate with straight ones, working in a complex manner. The trapezoid is slightly higher than the main tooth, and, as it were, cuts through the material “roughly,” making it easier for the straight edge to work. Used for cutting plastics and materials with durable double-sided laminate.

4. Bevel teeth

Discs with conical teeth are auxiliary. With their help, a preliminary cut is made in the laminate to prevent the formation of chips when cutting. Not used as a stand-alone tool.

In addition, the front plane of the teeth may have a concave shape. These saws are designed for cross cuts. The concave plane and sharp edge cut the transverse fibers of the material like a sickle.

Sharpening circular saws with your own hands video

There are discs with alternating active and passive teeth. Passive ones have a negative sharpening angle.

How to determine the wear of a circular saw?

All the qualities of a circular saw are available only with timely sharpening of the teeth. A dull blade spoils the material, increases wear on the saw’s drive mechanisms, and increases the risk of injury during operation. There are signs of dullness, when they appear, it is necessary to urgently sharpen circular saws:

• 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.

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.

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 machines that mechanically control the selected angles for each tooth. Depending on the intensity of use, the sharpening machine can have an automatic or manual drive. At home, as a rule, inexpensive models are used in which the rotation of the disk to the next tooth and control of the thickness of the metal being ground is carried out 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.

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Popular: Review of circular saws from hand to stationary

Source: https://spb-metalloobrabotka.com/kak-tochit-pilnyy-disk-po-derevu/

Methods for sharpening carbide circular saws

Sharp cutting discs cut wood quickly, evenly, without chipping at the edges. When the teeth become dull, the wood tears and burns. In order for the circular saw to work quickly and for a long time, you need to regularly sharpen carbide circular saws. This can be done using special equipment or using a grinder.

The harder the wood, the faster the cutting edge wears off. If you do not sharpen the saw blade in time, the teeth will break, the wear of the carbide plates will be great, and the service life of the circular saw will be reduced. Due to heavy loads when working with a blunt instrument, the circular saw overheats and can burn out.

Sharpening carbide circular saw blades

Signs that sharpening is needed

The tooth on a circular saw wears out faster on dense or damp wood. The working edge experiences more resistance and friction. Saw blades should be sharpened when the first signs of dullness appear:

• it takes more effort to cut wood;
• dark spots appear at the cut site;
• the smell of burnt wood is felt;
• the part being cut moves unevenly, jerkily;
• the engine hums louder;
• the motor casing gets hot;
• the edge of the tooth became rounded and curved.

If you do not pay attention to these signs, then breakage of the teeth and smoke from the burnt out drive will follow. The cutting plane on wooden parts will be uneven and torn. A dull tooth does not cut, but tears the wood fibers and presses grooves into it.

Types of teeth

The teeth are divided depending on the shape of the cutting edge and the direction of its slope. For soft wood, a straight tooth will work. It cuts with the main edge positioned perpendicular to the cutting line. When creating a groove in a part, a recess with a flat bottom is obtained.

The inclined blade gradually cuts into the wood, increasing the load. The working edge can be tilted to the right and left. Discs with alternately beveled teeth have the greatest productivity.

For dense rocks, trapezoidal sharpening is used, when the 3 main cutting edges form a trapezoid.

Each type of tooth has its own designation. The table contains the main types of sharpening of cutting blades on circular saws.

Symbol	Tooth type name	Number of cutting edges	Cutting edge shape
G.M.	With straight tooth	1	Straight, perpendicular to the axis
GK	Alternately beveled	1	Inclined at an angle of 40⁰
G.S.	Alternately beveled	1	Inclined at an angle of 10⁰
GA	With trapezoidal and straight	1 and 3	Alternating straight and beveled teeth
GT	Trapezoidal	3	Trapezoid
GR	Conical tooth	3	Frustum

In addition to the main cutting edges, there are auxiliary ones: back and side. They form a cut and remove irregularities left behind by the blade.

Types of sharpening angles

For high-quality operation of the circular saw, it is necessary to maintain several sharpening angles of the circular saw with carbide tips; their size is regulated by GOST 9769-79 . The rake angle determines the sharpness of the cutting edge. It is performed at 10 - 15⁰, depending on the hardness of the material being processed. The clearance angle is standard - 12⁰ in single-sided saw blades with straight teeth.

Bevel angles relative to the front and rear planes are ensured during the manufacture of disks. The leading edge of the sides is restored during sharpening. The rear one does not participate in the formation of the cut, it only contributes to the removal of chips. It practically does not wear off.

Double-sided circular saws are included in a separate group. The discs are made entirely of tool steels with solid teeth. The front and rear inclination angles are the same or differ within 10⁰. If the quality of the cut deteriorates, the disc can be turned to the other side. Double-sided fine-tooth saws are used on household circular saws with low loads. The cut is made at a negative angle, the teeth quickly become dull. Their positive quality is their relatively low cost.

Sharpening angle of carbide circular saw blades

Basic sharpening methods

The circulation saw is sharpened using a fine-grained abrasive wheel along the planes that form the main working cutting angle using the following methods:

• along the front plane;
• backing;
• on both planes.

In the case of a combined edge restoration option, the front corner is sharpened first. In this case, the disc can be resharpened 25–30 times during operation.

Removing a thin layer from the back of the tooth leads to a faster reduction in the diameter of the blade and wear on the saw.

At home, you can sharpen a circular saw with your own hands. It is enough to use a whetstone to straighten a tool with pobedit tips. In case of a large volume of work, a device is made from a grinder or a router.

Sharpening circular saws with carbide inserts requires more force and is carried out on special machines and a device with an abrasive wheel.

Manual method

Manual sharpening method on a flat grinding wheel.

1. Fix the grinder with the circle motionless.
2. Make a support for the disk. Its plane should be flush with the axis of the grinding wheel.
3. Bring the side of the tooth until it touches over the entire area of ​​the plane being sharpened.
4. Install 2 clamps on the right and left on the support table. They will help you set the sharpened plane quickly, without adjusting each tooth.
5. Press the depression against the left latch and turn it all the way to the right after each turn of the disk one step.

It is necessary to remove 0.12–0.15 mm from the cutting plate in one sharpening.

To sharpen a circular saw along the back plane, it should be rotated and the position of the clamps changed.

Grinder for sharpening circular saws

Use of machines

For mass production, circular saw blades must be sharpened regularly. For this purpose, the workshop has special machines with circles. Each of them has a device that positions the tooth relative to the circle at the desired angle and allows the tool to move forward.

In special automatically operating equipment, the disk performs only rotational movement by the size of a given step. A rotating abrasive wheel moves up after each turn and grinds the next plane.

You can sharpen a carbide disc manually using a whetstone, but the effect will be weak.
Without special devices, it is impossible to maintain the angle and remove an even layer from all planes. Correct and High-Quality Sharpening of Saw Blades Theory Part 1

Source: https://metalloy.ru/obrabotka/zatochka/tverdosplavnyh-diskovyh-pil

Sharpening a circular saw blade: how to properly sharpen a grinder with your own hands, machine, how to sharpen a circle at home

The use of circular saws is especially common in construction. Most work requires cutting and changing the shapes and sizes of finished materials. A circular saw helps you cope with such tasks quickly and get high-quality results. But the tool cannot serve forever; sooner or later it may become dull. This is precisely why you need to know exactly how you can sharpen saw teeth at home.

How to determine wear?

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

1. The protective casing becomes very hot and produces smoke. The circular saw has a special casing that indicates that the saw has become dull due to heat. In particularly difficult situations, smoke may appear from it.
2. Sometimes the saw design involves a mechanical feed (if you need to manually adjust the pressure force). In such a situation, wear can be noticed if the pressure has to be increased.
3. If, when sawing wood, carbon deposits and a strong unpleasant odor are formed on the workpiece.

All the situations described above tell the user that it is time to sharpen the device.

Types of cutting teeth

Types of teeth

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

At the moment of intersection with each other, they create a single cutting edge, thanks to which surfaces are cut.

There are several tooth shapes:

1. Straight tooth. Most often it is used only for quick longitudinal cuts. During such work, quality and accuracy are practically unimportant.
2. Oblique tooth. The rear plane of such a part is inclined to the right or left. On saws, these teeth often alternate, which is why they are called “variably beveled.” These teeth are most often used in tools. The size of the corners can be different, this is due to the coating of the surface being treated - wood, chipboard, plastic. They are used for longitudinal and transverse movements. A large angle of inclination on the tools is used when cutting boards with double-sided lamination. This helps avoid chipping the material. The larger the bevel angle, the easier the saw goes through the surface. But this significantly increases the likelihood of tooth breakage. On some products, the teeth are inclined not only at the back, but also at the front.
3. Trapezoid tooth. The main advantage of this type is that the edge dulls slowly. But they are rarely used separately; they are usually alternated together with straight teeth. During operation of the device, the trapezoidal teeth are located above the straight ones, so they take on the main (rough) sawing work. Straight teeth perform finishing operations. This saw design is used for cutting plastic, chipboard and MDF.
4. Conical tooth. This type of tooth is considered optional because it only helps to cut the bottom of the material (usually laminate). This design allows you to protect the surface from chips and cracks. Bevel teeth usually have a straight front edge, but they can also be concave. This type is used for finishing saw cuts.

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

Tools

Sharpening a saw with your own hands is only allowed when using special tools. For this, there is a sharpening machine that helps carry out the process automatically, rather than manually. Then the result becomes more accurate.

Source: https://2lzz.ru/elektroinstrument/tsirkulyarnaya-pila/zatochka-diska

Technology for sharpening circular circular saws at home

Any construction cannot be done without a circular saw. When performing various operations, you have to make cuts and cuts. With the help of a circular saw, it becomes possible to cut any tree with high speed and high quality. With constant use of such a device, the cutting tool becomes dull and the productivity of the operation decreases. Sharpening circular saws becomes the most important operation.

Classification of circular saws

To obtain a clean cut, it is necessary that the circular saw blades are sharpened correctly. Tools are divided into several groups:

• All metal.
• The working area of ​​the disk has a hard coating.
• Carbide plates are soldered onto the saw teeth.

The saw teeth must be set apart after sharpening. If you perform work with a dull tool, the drive begins to experience additional stress and the quality of the cut suffers.

If the disk works with hard wood, it must have special technological grooves. Their absence leads to overheating of the blade, the metal will begin to expand, and the cutting tool will deform. Dangerous vibration will appear and the quality of the cut will suffer.

Types of cutting surfaces

To increase work efficiency, engineers have developed several types of teeth, differing in their shape and sharpening angle:

1. Straight. Used for quick cutting with low quality. It cannot be used for jointing hard wood and particularly delicate operations.
2. Beveled shape. These teeth make it easy to cut composite materials. Double-sided laminated chipboard is cut without chipping. Hard workpieces are easily cut with teeth whose back surface has a beveled appearance. However, they get dull too quickly. To prevent this from happening, the inclination of the teeth alternates.
3. Trapezoidal. The main advantage of this method is considered to be slow dulling. It works in conjunction with straight teeth. The trapezoid is located above the main element. It does the rough work, making it easier to process straight edges.
4. Conical. Blades with this tooth shape are considered auxiliary. They are designed to make preliminary cuts and prevent the formation of chips. Such discs are not an independent tool.

On some canvases, the front plane of the tooth has a concave shape. This tool makes cross cuts.

Correct sharpening angle

Circular saws have teeth with two angles:

Source: https://pochini.guru/sovety-mastera/tehnologiya-zatochki-diskovyih-pil

Sharpening circular saws

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

Any disc must be sharpened with high quality, and the teeth must be correctly set. Dull teeth impair the quality of the cut, increase the load on the drive and make work unsafe. In addition, disks intended for working with hard materials must have technological grooves. Otherwise, when heated, the sheet may become deformed due to the expansion of the metal. This will lead to dangerous vibrations and poor cutting quality.

Sharpening carbide-tipped circular saw blades

When buying Pobedit circular saws, you should keep in mind that this type of cutting element also tends to wear out. Therefore, when using the tool for a long time, the cutting quality deteriorates. To restore the cutting ability of the part, circular saws with carbide tips are sharpened.

At the Mnogofrez company you can buy high-quality tools for cutting any materials. Timely sharpening of these parts extends the service life of the disc.

Features of soldered disks

The main advantage of these parts is their long service life. The high hardness of the material allows you to process even very durable wood species. In the manufacture of surfacing, steel 9ХФ, 50 ХВА, 65Г is used. If the disk is used intensively, there is a risk of premature failure. Untimely sharpening of carbide circular saws can lead to the failure of an expensive machine.

How to determine the need for sharpening?

Sharpening of Pobedit circular saws ensures a long service life. This procedure should be carried out when the following signs appear:

• The load on the engine increases due to the greater load when cutting wood. If there is no protective relay in the unit, the mechanism may fail.
• A change in the quality of the cut is manifested in the expansion of the thickness of the cut, the occurrence of chips or unevenness along the edges.
• Longer processing of the workpiece is caused by the difficulty of processing wood with blunt teeth.

Sharpening rules

Before starting the procedure, experts recommend completely cleaning the surface of the instrument from dust and debris. In this case, mechanical cleaning is not used, but detergents are used. Not just individual areas are subjected to sharpening, but all working surfaces.

When sharpening circular saws for wood, it is allowed to remove metal with a thickness of 0.05 to 0.15 mm. One disc can be sharpened up to 25 times. After this, it is not safe to use. For sharpening, as a rule, specialized machines or files for manual work are used.

The Mnogofrez company will help you not only choose high-quality tools for woodworking, but will also explain when and how to sharpen a brazed saw blade.

SEE ALSO: Sharpening a circular saw • Proper sharpening of cutters • Installing cutters on a CNC machine

Source: https://mnogofrez.ru/articles/zatochka-diskovykh-pil-s-tverdosplavnymi-napaykami/

Sharpening circular saws: definition and purpose of the tool, sharpening methods

Sharpening saw blades for wood is one of the most important activities for caring for a circular or circular saw. If you don't sharpen it, it will quickly become dull and become unusable.

It is most convenient to sharpen on a special production machine. However, many home craftsmen make their own design for this purpose, which significantly saves time and money.

Saws made from high-quality materials become dull less often, which means they require sharpening infrequently. However, if the discs are made of low-quality material (and this happens quite often, and even an experienced master cannot always determine the quality of the metal “by eye”), most likely they will have to be sharpened often. Therefore, any home craftsman who uses a circular saw should know how to sharpen it.

Definition and purpose of a circular saw

A circular or circular saw is a tool whose working surface is a disk. This disc can be of different thickness and diameter, depending on the purpose. The edges of the disk are equipped with sharp teeth, which can have different shapes, for example:

• Straight vertical teeth;
• Beveled teeth;
• Trapezoid-shaped teeth;
• Teeth resembling a cone.

It is used in cases where large volumes of wood need to be cut. It is convenient to work with both hard and soft wood. It can also be used to process plywood and chipboard.

When the disk is rotated, the teeth cut into the material and begin to saw it.

Experienced sawers claim that working with a circular saw is much easier than with a classic saw, which is a horizontal metal plate with teeth and one (two) plastic handles.

A circular saw is often used:

• At sawmills;
• On the construction of wooden houses;
• During renovation work in city apartments;
• At logging.

The working surface of such a tool usually has carbide tips. These tips are used to prevent the teeth from becoming deformed when sawing hard wood. However, sooner or later the teeth of any circular saw become dull. If this moment has arrived, then it’s time to sharpen the tool.

Disc sharpening

An experienced master usually immediately understands when the teeth begin to deteriorate. This can be determined by the following signs:

• visual deformation of the teeth (individual teeth may bend or break off);
• during sawing, the master has to exert great physical effort in order for it to work effectively;
• Some experienced sawers check the sharpness of the teeth by touch. However, this method is not recommended, since any careless touching of the teeth may result in a finger injury;
• Often produces an unpleasant creaking or crackling sound during operation. During the sawing process, you can clearly hear the wood creaking.

If the teeth become dull, it is advisable to sharpen the saw as quickly as possible. Many home craftsmen mistakenly believe that you can get injured from a sharp saw much faster than from a dull saw. In fact, the opposite is true.

This paradox can be explained simply: when a sawyer operates a dull saw, he has to apply physical force. If you miscalculate the force or apply it in the wrong direction, it is very easy to injure your hand.

And if the sawyer uses a well-sharpened tool, no effort is required, the main thing is precise and careful movements.

Using a special machine

Of course, the easiest way to sharpen a circular saw is on a special industrial machine. Such machines are quite expensive.

Purchasing a sharpening machine for personal use is only beneficial if the home craftsman works daily and saws large volumes of wood . Sharpening services are also available in many specialized stores .

A saw sharpening machine is somewhat reminiscent of a pottery wheel on which a saw blade rotates, placed strictly in a horizontal plane. The sharpening process consists of the following steps:

• The sharpener takes out a marker that writes on metal and marks the tooth needed to start sharpening with the marker.
• The disk is placed on the machine;
• The grinder turns on the machine and puts the mechanism into action;
• Sharpen the tool in a circle. First, the first tooth is processed, then the third, fifth, and so on. Every second tooth is processed;
• When one round of sharpening is completed, a new round begins. This time, every second tooth of those that were not processed the first time is processed;
• This cycle is repeated several times, depending on the number of teeth on the saw blade. If the disc has a small diameter, two to three cycles are enough for sharpening. If it is a large disc with a lot of teeth, it may take quite some time to completely sharpen it. And also the time spent on sharpening depends on the power and speed of the sharpening machine.

Sharpening saw blades on a machine is very convenient. The main thing is to follow safety precautions and under no circumstances adjust the saw blade while the machine is running. All manipulations with the disk are carried out only when the sharpening machine is turned off.

Self-sharpening

Many home craftsmen do an excellent job of sharpening circular saws without a special machine. Most owners of circular saws have long been accustomed to sharpening saw blades on the fly, using an ordinary file or other available sharpening tools. However, this method is very inconvenient and traumatic. In addition, when sharpening by hand, you can accidentally miss individual teeth. Therefore, this method should not be used.

Experienced sawmills usually make a round wooden stand for sharpening saws, on which the saw blade is placed. The operating principle of such mini-machines is approximately the same as the operating principle of industrially produced machines.

Masters believe that before sharpening saw blades should be slightly damp - this makes sharpening much easier. To do this, sharpeners wet saw blades with water and various chemicals. However, experts say that in fact this method only brings harm. Any liquid corrodes the metal and causes it to corrode, that is, contributes to the appearance of rust.

When sharpening yourself, you need to be careful not to miss a single tooth. Even if only a few teeth have become dull and the rest remain sharp, absolutely all teeth need to be sharpened. It will work correctly only if all sawing elements are sharpened equally.

Sharpening a circular saw yourself is not as difficult as it seems. How exactly to sharpen a saw, on an industrial machine or on a primitive stand, is up to each home craftsman to choose for himself.

However, in any case, it is necessary to strictly observe basic safety precautions and sharpen the teeth as sharply as possible. If you encounter difficulties associated with sharpening a circular saw at home, you should consult a specialist.

If you regularly maintain your circular saw, it will serve faithfully for many years.

Source: https://tokar.guru/instrumenty/pily/zatochka-diskovyh-pil-s-tverdosplavnymi-napaykami.html

Sharpening circular saws for wood with your own hands: geometry of corners, machines

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

Carbide-tipped disc

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

Geometry of carbide tips

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.

1. Take a new disc with soldering, which is completely identical to the dull one.
2. Draw precise outlines on a hard sheet of cardboard.
3. Using a pendulum goniometer, determine the initial geometry of the carbide tips.
4. 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

Machine for sharpening tipped 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.

First of all, you should read the manufacturer's recommendations. They indicate the number of revolutions (maximum and minimum) for various types of processed materials. For metal this parameter should be less than for wood.

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.

Straight tooth Oblique (beveled) tooth at the back Oblique (beveled) tooth at the front
Trapezoidal tooth Conical tooth Concave tooth

Circular saw sharpening machines, review and comparison

Model	LTT MF126A	SZTP 600T	LTT MF1263	Hi-tech PP-480Z
Grinding wheel size, mm	100	150	150	480
Power, W	370	250	250	380
Diameter of sharpened saws, mm	160-600	140-170	100-630	65-480
Weight, kg	45	50	260	160
Dimensions, mm	680*480*410	700*600*400	780*620*1280	850*760*1450
Price, rub	20786	35000	185818	361649

LTT MF126A SZTP 600T LTT MF1263 Hi-tech PP-480Z

Source: http://StanokGid.ru/osnastka/zatochka-diskovykh-pil-s-tverdosplavnymi-napaykami.html

How to sharpen circular saws yourself

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:

1. 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.
2. With strong pressure on the tool to obtain a good cut while processing the material.
3. 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:

1. Straight tooth type. Often used for accelerated longitudinal sawing. They do not have ideal cutting quality.
2. 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.
3. 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.
4. 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.

 "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.

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

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

Source: https://pro-instrymenti.ru/abrazivnye/kak-vypolnit-zatochku-diskovyh-pil-svoimi-rukami/

Required Tools

You can sharpen disks for a circular plate with your own hands only if you have special tools. There is also a machine that allows you to automate the process and make it more efficient.

To carry out the work of sharpening a disc with your own hands, you can use the following tools:

1. assembly vice;
2. file;
3. block of wood.

You can also use a circular saw sharpener, which does not require the above tools.

When is it necessary to carry out restoration work on circular saws?

A rather important issue is determining when circular saws should be sharpened. Excessive wear may make it impossible to carry out such work. There are three clear signals that determine the need to sharpen a circular saw blade:

1. Smoke appears, the protective casing heats up. The device, as a rule, has a special protective casing, which can heat up if the disk becomes dull. It should also be noted that in special cases, smoke appears due to the strong heating of the cutting zone.
2. Also, with mechanical feeding, when the pressure is adjusted with your own hands, great force should be applied to obtain the desired result.
3. When processing wood or other material, traces of soot and a corresponding odor appear in the cutting area.

In the above situations, it is recommended to sharpen the circular saw blade.

Principles and angles of sharpening circular saws

The saw has four main sharpening angles for the circular saw blade along the working part. The angles under consideration, as well as the tooth shape itself, can be called the main performance characteristics. Each tooth can be characterized as follows:

1. front and back angle;
2. cutting angles of the front and back surfaces.

The values ​​of the above parameters depend on the purpose of the sawing device and the type of workpiece material.

Circular saw tooth surfaces

Based on the above parameters, several saws can be distinguished:

1. for performing longitudinal cutting. In this case, the rake angle should be from 15° to 25°.
2. when performing cross cutting, the considered indicator should be from 5° to 10°.
3. The universal version is recommended to be sharpened at an angle of 15°.

The type of material being processed also determines what characteristics the tooth should have. As a rule, the harder the material, the more difficult it is to machine. That is why it is recommended to sharpen the cutting teeth to a lesser extent.

With prolonged use of a carbide saw, significant wear occurs on the uppermost cutting edge. When considering the tooth plane, it is worth noting that most wear occurs on the front surface.

Types of Circular Saw Teeth

Sharpening circular saws at home

You can sharpen the saw yourself without using a special sharpening machine, which is expensive and is rarely used for its intended purpose due to the use of carbide material when creating the cutting edge. However, you cannot simply hold the circle in your hands, since you need to achieve certain cutting parameters to ensure the required performance indicator.

To fix the gear wheel in a strictly specified position, an ordinary flat stand is used. It has the following features:

1. The surface of the flat stand should coincide with the level of the axis of the sharpening disc.
2. We place the toothed wheel on the stand so that the sharpening plane is perpendicular to the saw blade.
3. The device in question for teeth located at a certain angle is equipped with a rotary hinge.

The device in question makes it possible to fix the element being processed in relation to the abrasive material used. Using a colored marker, marking lines are drawn that allow you to select the correct angle. A vice is also needed in which the created fixing device is attached.

Sharpening using a machine

If it is possible to purchase a special machine, then the process in question can be carried out with maximum efficiency. This device is compact in size and can be used at home.

Particular attention is paid to the choice of abrasive wheel. In this case, we note the following nuances:

1. Carbide blades are difficult to sharpen.
2. When choosing, you should pay attention to wheels made of CBN, with diamond chips or green silicon carbide.

The sharpening process when using professional equipment is very simple. The disk is secured using a special clamp. It was created taking into account the design features of the circle.

We will pay special attention to the fact that when using special machines it is very easy to sharpen circular saws while maintaining the required parameters. In this case, the error is minimal. This is due to the fact that the design has a special angle indicator meter.

In order not to be mistaken at the time of work as to which teeth have already been processed, you should use a marker to mark the starting point.

Source: https://stankiexpert.ru/stanki/zatochnye-stanki/zatochka-diskovykh-pil.html

Grinding machine for circular saws: rules for sharpening circular saw teeth and making tools yourself

In principle, you can sharpen the teeth on a circular saw using an ordinary file.

However, when choosing this very labor-intensive method of sharpening, difficulties arise that only a person with the appropriate experience can cope with. In particular, it is quite difficult to maintain the required degree of angles. It is much faster and more efficient to use special machines to sharpen circular saws.

Types of machines

All machines for sharpening circular saws are divided into automatic and mechanical according to the method of control (handling).

An automatic machine for sharpening saw blades, as the name suggests, does not require much effort on the part of the master; it is enough to simply set everything up (in particular, set the angle and pitch of the teeth) and turn it on. Such units can be seen at large enterprises and industrial workshops.

Mechanical sharpening tools have lower productivity than automatic sharpening tools. Here you have to manually perform an operation such as turning the disk to the next tooth. Mechanical equipment is mainly used in home workshops.

In addition, all sharpening machines can be divided according to the operating principle into three groups. The first includes tools on which, when sharpening, only the saw rotates (the grinding wheel and the electric motor, respectively, are stationary). The second type includes sharpening machines, during operation of which both the saw and the motor with the abrasive wheel move. In machines of the third type, only the engine with the circle attached to it moves (the circular saw remains motionless).



There are no sharpening machines that do not have at least one of these elements (a motor with a sharpener attached to its shaft or a support for securing a circular saw).

Main characteristics

Devices for sharpening circular saws on wood are usually equipped with wheels. These circles can differ significantly from each other in several characteristics:

• by diameter (varies from 12 to 250 mm);
• the material from which the abrasive wheels are made (this could be, for example, CBN or silicon carbide, in some cases diamond coating is also used);
• thickness (it can range from 16 to 40 millimeters);
• sizes of mounting holes (standard diameters of such holes today are 16, 20 and 32 mm).

Almost all modern sharpening machines have an electric drive. The sharpening performance will directly depend on its power. Low-power household models can function uninterruptedly for up to 20 minutes, then they must be turned off so that they can rest and cool down. But professional sharpening units can work up to eight hours with two short breaks of half an hour. Moreover, here the main working element may not be the abrasive wheel, but the so-called sanding belt.



Disc tooth shape

According to GOST, any carbide tooth in a circular saw must have four working planes (front, back and two side) and three cutting edges (one main plus two auxiliary). But at the same time, the shape of the teeth of circular saws can still be different:

• straight;
• oblique;
• trapezoidal;
• conical

One or another option should be chosen in accordance with the tasks facing the master.

Note! To properly sharpen a tool, the master must determine the shape of the teeth, as well as the material from which the saw itself and its cutting elements are made.

A circular saw with straight teeth is best used for longitudinal sawing of wood when high quality is not required.

Oblique teeth on a circular saw are characterized by the fact that they have a beveled rear (and sometimes front) plane and an alternating angle of inclination (either to the right or to the left).

Saws of this format are considered the most common. They are used for sawing wood products in the transverse and longitudinal direction. In addition, this configuration of the teeth is convenient for trimming materials with double-sided lamination—there are no chips along the edges of the cut line.

Trapezoidal teeth are able to maintain their original sharpness for a long time. On many models of circular saws they often alternate with the straight teeth already described. Trapezoidal ones are always taller - by this criterion they can be calculated. It is important to understand that trapezoidal teeth play the main role when rough sawing wood, and straight teeth play a major role when cutting wood.

As for conical teeth, it is important to use them in some auxiliary operations. For example, when a layer of laminate needs to be cut a little first, so that further fragments do not appear during sawing.

Basic rules for sharpening a circular saw blade

Before you start sharpening, the grinding wheel must be cleaned of dirt and residues of removed material. To do this, it is better to use detergents containing solvents. It is also important to set the optimal angle of inclination of the grinding wheel in advance. Information about this can be found on the circular itself or in the product passport.

The sharpening process should begin from the front of the teeth. The thickness of the removed metal layer should not exceed 0.2 mm.

Note! The master must ensure that the blade of the circular saw does not overheat.

By adjusting the rotation speed of the sharpening machine's abrasive, you can prevent the temperature of the blade from rising to extreme levels. It doesn't hurt to wet the abrasive with water before starting work. If you are dealing with diamond coating (such as are used for processing circular saws with pobedite tipping), then you should use a special coolant (coolant) instead of water.



Sharpening a circular saw should be done with a certain amount of care. Otherwise, nicks, chips, and other defects may appear on the cutting edge that impair its integrity.

You can sharpen one disc a limited number of times (as a rule, the disc life is 30–35 sharpenings). And this is quite natural, considering that after each procedure the size of the teeth decreases. Sooner or later, the teeth will be ground down to a critical point, and the use of the disk will become impossible.

Surely someone will ask whether it is possible to do without sharpening at all. The answer to this question will be strictly negative. The use of blunt blades impairs the quality of the cut, sharply reduces labor productivity and can lead to premature failure of the circular saw.



Homemade sharpening machine

If you don’t have factory equipment at hand and still need to periodically sharpen the discs, then you can try to make the machine yourself. For assembly you will need:

• support (that is, a unit for attaching and moving the saw);
• an electric motor on which the grinding wheel shaft can be installed;
• tilt mechanism;
• screw type limiters.

The circle should be clearly fixed on the electric motor, and the disc blade should be installed on the caliper. The task of the screw stops in this case will be to ensure the movement of the saw along the axis of the circle and at the required angle of inclination. Correct fixation of the circular disk relative to the abrasive element is the main function of a homemade machine and at the same time a guarantee that the sharpening result will be worthy.

If a home craftsman wants to achieve perfect angles, then he will need one more device - an adjustable stand, fixed at the same height as the circle on the frame of a homemade unit. The disk must be installed on this stand so that the teeth are positioned strictly perpendicular to the main plane of the machine.



Even if you have all the necessary components, assembling a circular saw sharpening machine with your own hands can be difficult. Drawings that you can draw up yourself or use existing diagrams from specialized literature will help you navigate the stages of work. It is also useful to study videos, which sometimes give interesting ideas for the design of sharpening devices.

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Source: https://DrevoGid.com/instrumenty/pily/zatochnoj-stanok-dlya-diskovyh-pil.html

How to sharpen a tipped circular saw blade

Construction of a private house will be difficult and time-consuming without the use of modern tools. The circular saw has gained great popularity among builders, surpassing other types of wood saws in its accuracy and cleanliness of cutting.

Diagram of a machine for sharpening circular saws and knives.

Since this power tool is an actively used device that wears out quite quickly, sharpening circular saws with your own hands becomes very important.

Tools for sharpening circular saws

To properly sharpen a circular saw, you need tools such as:

• file;
• assembly vice;
• block of wood;
• colored marker.

What signs indicate that your saw needs to be sharpened?

Figure 1. Saw tooth diagram. Planes: a - front, b - rear, c - two lateral. Edges for cutting metal: 1 – main, 2, 3 – additional.

You should sharpen your circular saw only when the need arises. And the fact that such a moment has arrived will be signaled by 2 clear signs. In particular, urgent sharpening of circular saws for wood is required if:

1. The safety guards of the saws in the area of ​​the electric motor feel very hot. Sometimes such an increase in temperature is accompanied by the appearance of smoke from under the casing.
2. To obtain good results, you have to apply more pressure on the circular saw than before.
3. As a result of the work of blunted teeth of saws on wood, the appearance of dark marks and traces of soot is recorded on the cuts in the wood. The characteristic smell of burnt wood may spread.