Technology for sharpening circular circular saws at home

Introduction

Professional sharpening of circular saws is carried out on a specialized machine, according to a given program.
The entire technological process can be either automatic or semi-automatic from the beginning of sharpening to the end. The operator only prepares the workplace, places the discs in the washing machine and secures them on the machine bed. The robot manipulator performs the rest of the operations itself. Very convenient and efficient. After such repairs, the blade looks like new and continues to serve perfectly without losing its performance qualities during the sawing process. The question will follow - where to sharpen a circular saw with Pobedit tips, what workshops operate in the region? I do not provide any advertising, all information is provided solely for informational purposes and to help you. Please ask all questions via contact information or in private messages on the blog.

This is what a specialized workshop with equipment looks like.

Before the operator starts work, he must make a preliminary diagnosis of your disks, as well as check the wear and runout of the disk. Only after these measures have been carried out, a program for sharpening a circular saw with pobedit tips, if any, is selected.

Types of saws

If the disk is properly sharpened and the teeth are set according to the pattern, then it can process the workpiece in any direction relative to the wood fibers.

There are these types of tools:

• saw with carbide blades;
• discs made of solid metal;
• discs with teeth treated with hard material;
• discs with heavy-duty soldered teeth.

Hardwoods are processed with discs that have special grooves. Technological breaks prevent tool deformation and prevent it from overheating during the production cycle. Vibration and background noise are also significantly reduced, and the quality of the line formed by the cut is improved. The saw has teeth that are machined at a certain angle, each tooth has several cutting edges.

There is a main edge, additional ones are mated to it, and intersecting planes are formed:

• A;
• IN;
• WITH.

The planes themselves also vary in different mates.

The teeth can be straight, they are usually used for preliminary cutting of material. These teeth provide a low level cut. However, the productivity of such teeth is quite high.

Beveled teeth provide a more precise line and are suitable for cutting materials such as:

• plywood;
• PVC sheets;
• chipboard;
• Fiberboard.

The teeth ensure an even cut without the material crumbling.

There are also discs in which there is a bevel at the leading edge of the cutter, and there is also a bevel with the trailing edge. Options for alternating different teeth with different bevels are possible. Such tricks ensure a clean cut, but you should remember: the denser the material, the faster such teeth become dull.

Trapezoidal tooth – this tooth configuration ensures long tool life. Often a complex design is used, when trapezoidal and straight teeth alternate. The latter make the primary cut, which allows straight-shaped teeth to “polish” the cut.

Cone-shaped tooth - these teeth are auxiliary and are designed to work with materials that have a laminated surface. They ensure correct cutting without the formation of any chips.

Sickle-shaped tooth - in this case, the teeth are bent, which makes it possible to accurately cut the material across the wood fibers.

Ways to increase the service life of saw blades

Tooth angles for sharpening
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:

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.

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:

Do-it-yourself saw sharpening at home

Figure 4. In order for sharpening to be correct and fast, the disc should be well secured.

You can sharpen your saw at home. To do this, it is not necessary to have a specialized sharpening machine in your own workshop, which costs a lot of money and is rarely used for its intended purpose.

But simply holding the disc in your hands and sharpening the teeth on a grinding wheel while suspended is irrational. No amount of steady hand or excellent eye is enough to make the cutting element impeccably sharp and suitable for effective work. For this purpose, care should be taken to make the simplest fixing device (Fig. 4).

Its surface should coincide with the level of the grinding disc axis. The gear wheel itself is placed on the stand so that the planes of the teeth to be sharpened are perpendicular to the saw blade. To sharpen beveled teeth along the front and rear surfaces, this device is made with a movable hinge.

However, in this case it is difficult to maintain the same value of the front and rear sharpening angles. To eliminate this problem, the center of the saw wheel is rigidly fixed in the desired position in relation to the abrasive disc. This is done either using a groove for a mandrel, which is mounted on a stand to place the saw being sharpened on it, or by installing special stops on the stand that secure the saw blade at the required angle to the sharpening wheel.

If you meet all the requirements for the technology of sharpening carbide circular saws, then they will serve a person for a long time and effectively.

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

Kitchen knife made from a circular disk

Greetings to those who love to craft, I offer for consideration a high-quality kitchen knife that any cook will be happy with. The starting material for the knife was a circular saw blade. The blade was hardened, the blade was sharpened so much that the knife easily cuts paper. The manufacturing process is not difficult, but you will have a lot of sanding work to do, so it will be useful to have a belt sander. If the project interests you, I suggest you study it in more detail!

Materials and tools used by the author:

List of materials: - saw blade (better than the old model); - wood for the handle; - brass, textolite or G10 for the bolster; - brass rod for the pin; - epoxy glue; - acid for etching; - heat-resistant cement.

Step one. Cutting out the main profile First you need to select high-quality source material. The author used a saw blade for such purposes. Before making a knife, it is important to check the steel for hardening, since in modern disks the steel may be bad and the knife will turn out unsuccessful. Well, then we draw the desired profile of the knife on the disk with a marker and cut it out. For cutting, the author used an ordinary grinder.

The easiest way to sharpen the knives of a jointer or planer. How to sharpen jointer knives.

Step three. Bevels We begin to form bevels on the knife, but for this we first make markings. It is important for us to draw a line along the blade, which, after grinding, will become the blade itself. This can be done with a special device, or using a drill of the same diameter as the thickness of the workpiece. And so that the fishing line is clearly visible, we paint over the metal with a marker.

Next, you can start sanding, in this case we will need a belt sander. The author holds the workpiece with his hands, and to prevent the steel from overheating, we wet the blade in water from time to time. When working, make sure that the bevels are symmetrical. The blade after work must have a thickness of at least 2 mm, otherwise the steel will burn out during hardening.

Step four. Heat treatment Let's start hardening, the author decided to use a hamon line on the blade, with it the blade looks unique. To obtain such a mowing line, we need heat-resistant cement; we coat the upper part of the knife with it. Where this coating is, there the steel will then differ in color.

That's all, now heat the blade until it glows red and lower it into the oil. To avoid unpleasant surprises such as cracks and deformations, the oil must first be heated. After hardening, we check the blade with a file; there should be no scratches.

After hardening, we must temper the steel to give it spring properties. As a result, the blade will be able to withstand high bending loads; it will also break if thrown onto concrete. We release the blade in the oven, the temperature should be around 200°C. As for the time, this is usually about 2 hours; you need to ensure that the blade is covered with a straw-colored coating, this will indicate the tempering of the steel.

Step five. Pickling To obtain the hamon mowing line, we need to pickle the steel. To begin, sand the blade very carefully until it shines. The steel must also be well degreased, otherwise the reagent will not react with the steel. We lower the blade into the acid for a while and watch the process, waiting for the desired result.

After etching, treat the blade with soda or another reagent to neutralize the acid. Then the knife is washed under running water and now we have a wonderful blade ready.

Step six. Blank for a handle To make a handle, we will need a block of beautiful wood, as well as G10 material or sheet brass, if desired, to make a bolster. First, we make a bolster, cut off a piece of the required size and make a slotted hole for the shank of the knife. If you don’t have a router, you can use a drill and flat files.

Also, a slotted hole must be drilled in the block, from which the handle will then be made. You can drill a series of holes and then combine them. That's all, now we glue all these parts onto the shank of the knife. We use epoxy resin as glue. The steel must be well degreased for high-quality gluing. We clamp the whole thing with a clamp and leave it to dry.

Step seven. Forming a handle When the glue is completely dry, you can now set the desired profile for the handle. We cut off the excess on a band cutting machine or with a hand jigsaw. Next, we refine the handle with wood files and sandpaper. The wood must be brought to a perfectly smooth state, so the handle will be pleasant to the touch, and you will also get an expressive wood pattern.

When the handle is ready, saturate it with wood oil or wax. This impregnation will perfectly protect the wood from moisture, which is important for a kitchen knife. Oil also emphasizes the natural beauty of wood.

Step eight. Completion That's all, the knife is ready, all that remains is to sharpen . For such purposes, it is very convenient to use sharpening stones or a manual machine based on sharpening stones. The author sharpened the knife to the point of a blade; it easily cuts paper. Of course, such a knife will cut greens and other products perfectly.

In general, if the knife is not left to sour in the sink, it will last quite a long time. At this point the project can be considered successfully completed, I hope you liked it. Good luck and creative inspiration if you decide to do this again. Don't forget to share your ideas and crafts with us!

Sources:

https://kakpravilno-sdelat.ru/kak-pravilno-tochit/kak-pravilno-razvesti-i-natochit-disk-cirkuljarki.html https://moiinstrumenty.ru/rasxodnyj/zatochka-fugovalnyx-nozhei-svoimi-rukami .html https://elton-zoloto.ru/raznoe/kak-tochit-nozhi-na-fuganke.html https://usamodelkina.ru/14469-kuhonnyj-nozh-iz-diska-ot-cirkuljarki.html

How to sharpen: basic methods

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

Manual method

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

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

Some features:

1. the surface of the stand coincides with the level of the grinding disc axis;
2. a gear wheel is placed on it so that the sharpening plane becomes perpendicular to the saw blade;
3. The design of the device is complemented by a rotary hinge.

The stand will help you comfortably position the saw blade for processing relative to abrasive material. Before starting work, clear markings are carried out. A colored marker is used for this. They draw lines that will allow you to sharpen the element at the desired angle. A vice will help securely secure the disc to the surface.

Video of sharpening a circular saw blade with a grinder:

Using the machine

When the craftsman has access to a special sharpening machine, the processing of elements occurs quickly and efficiently. This device is small in size, so working with it is comfortable even for a beginner. There will be no problems even when used in domestic conditions.

When purchasing such a device, look at the abrasive wheel. To select it, certain nuances are taken into account:

• It is best to purchase a circle made of diamond-coated CBN or green silicon carbide;
• If a carbide blade is sharpened, problems may occur even when using a machine.

The process of using the sharpening machine is extremely simple. The operator must place the disk comfortably on the device and clamp it using a special clamp. Before starting work, it is recommended to mark the first tooth with a marker. This will help you avoid getting confused while sharpening and not checking teeth that have already been processed. To select the sharpening angle, a special meter is provided on the device. You should set the required angle on it, after which the device will perform the task independently.

A circular saw is a useful tool that you cannot do without during construction. It helps to make cuts in surfaces, as well as change their shape and size. To sharpen discs, special machines or improvised materials are used. Doing the work with your own hands is not so difficult, you need to follow the recommendations listed and not be afraid.

Sharpening a disk with pobedite tips:

Recommendations

And finally, some advice from experts:

• the frontal part should be monitored more closely;
• when working with massive elements, the side planes are subject to heavy loads;
• radius rounding no more than 0.21 mm;
• It’s best to process the teeth both front and back;
• metal removal parameters should not exceed 0.151 mm;
• the disk is cleaned before starting work, all relevant corners should also be checked;
• sharpening the teeth at the desired angle requires practical experience; in the absence of this, it is better to take the disc to a workshop;

• wheels with diamond coating should be cooled using a special coolant;
• a unit designed for sharpening circular knives is capable of working with a workpiece in only one plane;
• the teeth should not be allowed to wear to the point of rounding by more than 0.21 mm, otherwise it will be difficult to do normal sharpening;
• Usually the disk has a resource of no more than 36 sharpenings, and it does not matter on which unit the processing takes place;
• It is important to ensure that the metal does not receive defects during processing (chips, cracks, nicks), their appearance can provoke further destruction of the material.

The following video shows how to sharpen carbide-tipped circular saws.

Determining the degree of wear and sharpening angle

Circular saws, sooner or later, lose their performance characteristics during operation; it is possible to effectively extend the service life of the tool if it is sharpened again correctly. This operation is simple; in many cases you can do the work yourself.

First of all, you should have an idea: what parameters does the working disk of the unit have?

The second most important parameter is the sharpening angle, what parameters the tooth itself has

Before you start working, you should test the tool to understand how relevant its restoration is. The disc should be inspected by removing it from the machine. An important indicator is the change in size, this can be seen even with a cursory examination.

The “knobs” themselves are made of heavy-duty steel of the following grade:

• 9HF;
• 50 HVA;
• 65G.

Some other grades of steel are also used.

This material stands out for its strength and wear resistance, but it also requires preventive treatment.

The teeth themselves have a standard prescribed in GOST 9768-78, however, each manufacturer has differentiation in inclination angles and shapes.

In the absence of a template, you will need to determine the parameters of the teeth yourself. There is a tool for this - a pendulum protractor. With this tool you can accurately set the sharpening angle.

Another option is to take a new disk and use it as a template. You should take a sheet of thick cardboard and draw precise outlines on it with a pencil. Then, using a pendulum angle gauge, the exact configuration of the soldering should be established. It is recommended to save this sample; you can work with it in the future, using it as a standard.

After finishing the work, it will be necessary to test the resulting sample by comparing it with the standard. The angle of inclination in such saws ranges from 15 to 25 degrees.

Something to keep in mind when starting work: the rake angle may have a negative value. Similar models are used for working with PVC sheets, as well as soft metals.

Necessity of the procedure

Circular saws are needed both in private households and in production. When building a house, creating furniture, cutting boards, timber - a similar tool is required everywhere. Properly sharpening a circular saw requires practical skill and knowledge.

Circular saws compare favorably with other cutting tools:

• chain;
• saber;
• longitudinal.

Disc circular devices have significant productivity, and their service life is also much longer. Sharpening circular saws is an important necessary step; without it, the tool will not work fully. Thanks to various attachments with carbide tips, as well as pobedit coatings, cutting can be carried out with both wood and metals.

To sharpen discs with different attachments, special equipment is required. If the disk is treated “scientifically”, this will greatly extend its service life.

Timely sharpening of circular saws is carried out when there are several obvious signs.

• The engine begins to experience unnecessary loads. The reason is simple - the teeth are dull and additional resources are required to process the material. There is a danger: if the disk is damaged, if there is no engine shutdown relay, the machine may fail.
• If chips and chips form on the cut, and the cut itself becomes too wide, then this is a sure sign that the tool should be repaired.
• A foreign smell of burnt material appears, and dark spots are visible on the cut line.
• The time required to process a part increases.

How to sharpen: basic methods

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

Manual method

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

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

1. the surface of the stand coincides with the level of the grinding disc axis;
2. a gear wheel is placed on it so that the sharpening plane becomes perpendicular to the saw blade;
3. The design of the device is complemented by a rotary hinge.

The stand will help you comfortably position the saw blade for processing relative to abrasive material. Before starting work, clear markings are carried out. A colored marker is used for this. They draw lines that will allow you to sharpen the element at the desired angle. A vice will help securely secure the disc to the surface.

Video of sharpening a circular saw blade with a grinder:

Using the machine

When the craftsman has access to a special sharpening machine, the processing of elements occurs quickly and efficiently. This device is small in size, so working with it is comfortable even for a beginner. There will be no problems even when used in domestic conditions.

When purchasing such a device, look at the abrasive wheel. To select it, certain nuances are taken into account:

• It is best to purchase a circle made of diamond-coated CBN or green silicon carbide;
• If a carbide blade is sharpened, problems may occur even when using a machine.

The process of using the sharpening machine is extremely simple. The operator must place the disk comfortably on the device and clamp it using a special clamp. Before starting work, it is recommended to mark the first tooth with a marker. This will help you avoid getting confused while sharpening and not checking teeth that have already been processed. To select the sharpening angle, a special meter is provided on the device. You should set the required angle on it, after which the device will perform the task independently.

A circular saw is a useful tool that you cannot do without during construction. It helps to make cuts in surfaces, as well as change their shape and size. To sharpen discs, special machines or improvised materials are used. Doing the work with your own hands is not so difficult, you need to follow the recommendations listed and not be afraid.

Sharpening a disk with pobedite tips:

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

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

Methods for sharpening a disc for woodworking

The following methods ensure efficient and safe sharpening of circular saws.

Grinder - step by step instructions

Special machines for sharpening circular saw blades are expensive and require certain skills to operate, so angle grinders, that is, “grinders,” are an effective and affordable alternative.

To fix the disc, a special smooth stand is used, which is designed taking into account the fact that the tooth must be perpendicular to the grinder disc and have a minimum deviation from it.

For sharpening using a grinder, the following algorithm is used:

1. The grinder is equipped with a grinding disc, and the disc to be sharpened is attached to the platform.
2. The grinder is held by hands or using a holding device.
3. The cutting edge of the circular tooth is processed with a grinder. In this case, a light, uniform movement is performed.

Evidence that the edge has been sharpened will be a visual update of the edge - it will no longer be darkened.

It is forbidden to turn on the grinder if the disc is placed in the throat between the teeth of the disc being sharpened.

File

If a file or needle file is used as a tool, then all sharpening activities are the same as when using an angle grinder. In addition, to maintain the sharpening angle, a special template is required, which is used as a guide plane between the tooth and the file.

But at the same time, the work will take much longer, since circular saws use carbide attachments.

Special machine

Machines for turning circular saw cutters are complex engineering and technical devices, which, in addition to mechanisms, are also equipped with automatic electronics.

These machines allow you to perform the most effective restoration of cutting edges in compliance with all the necessary configurations. The efficiency of the machines is explained by the following criteria:

• Possibility of automating the sharpening process.
• Saving sharpening angle parameters for each cutter.
• All cutters are sharpened identically with minimal error.
• Possibility of complete restoration and restoration.

For sharpening on a machine, the saw blade is placed in a special support and secured.

The sharpening parameters are selected, which are provided by special mechanisms for tilting the disc being sharpened or tilting the sharpening disc in the machine.

The disc to be sharpened is placed in the working area of ​​the device.

The machine starts up and sharpening is carried out automatically.

Homemade machine

To operate effectively, homemade machines must include the following components:

• Angle grinder (grinder) as a direct sharpening device.
• Support for securing the saw blade of a circular saw.
• Mechanisms to allow the support to tilt to adjust the sharpening configuration.
• The entire mechanism is fixed to a frame, which can be a channel or an I-beam.

The operating process is similar to using the original sharpening machine with the only difference - the circular blade is fed to the working area of ​​the device manually.

Expert advice

Experience is a useful thing, thanks to which you can avoid a number of mistakes typical for beginners

Therefore, paying attention to the advice of experts is very useful if you want to achieve a positive result for yourself when turning a circular saw.

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

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

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.

Basic sharpening angles for 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 to maintain the characteristics of the saw blade.

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

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

1. Longitudinal cutting, where the rake angle should not go beyond 15–25 degrees.
2. Transverse cutting, where it is permissible to sharpen the front edge of the tooth at an angle of 5–10 degrees.
3. Universal discs that can handle both longitudinal and transverse cuts quite easily; their rake angle should be maintained around 15 degrees.

The bevel angle 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.

Important Features

So that readers do not get lost in the wilds of the modern market for accessories for circular saws, we have prepared 5 main criteria that will help you make your choice. Let's consider them in order of importance.

External diameter

The outer or outer diameter of the disk should not exceed the dimensions of the circular saw casing, otherwise it will not be possible to install it in the seat. Increasing the parameter leads to an increase in the depth of cut. The characteristics vary from 65 to 500 mm.

Landing diameter

Landing, or internal diameter - the size of the hole in the center of the equipment. Determines whether the saw blade will fit on the spindle. The most popular sizes: 16 , 20 , 22 , 30 and 32 mm. But the full range is much wider - from 11 to 50 mm.

Manufacturers may install pins on the saw seat for additional fixation . In this case, you need to choose a disk with appropriate holes .

Number of teeth

As the number of teeth increases the processing speed decreases , but the cleanliness of the cut improves . And vice versa: the fewer teeth, the faster the work goes , but the cut becomes less and less accurate . The characteristic has its own classification, presented in the table:

Tooth sharpening angle

Sharpening inclination is the angle of deviation of the cutting edge of the tooth from the radius of the saw blade. The picture clearly shows how a characteristic can influence the work process. The angles are:

Standard : 5-15 °. Universal sharpening. Suitable for all types of cuts.

Positive : 15-20 °. Ideal for rip sawing due to its gripping effect.

Negative : from to - 5 °. Used for cross cutting, does not form chips.

Disc thickness

The standard parameter is 3.2 mm. The thinner the disk, the more it heats up and the faster it fails. The large thickness guarantees a long service life of the equipment, but slows down the work. In this case, the excess consumption of material increases due to the wide cut.

Geometry of cutting elements

The working element of the saw - the tooth - has a certain geometric shape with the presence of not one, but several cutting edges. There is always one main edge and additional ones formed by the intersection of planes “A”, “B” and “C” in certain combinations. To work with different materials, it makes sense to select discs with the most suitable shape of cutting teeth.

Straight tooth

A saw blade with such a working zone is intended for rough cutting of lumber. The cut is rough, of low quality, and the operations are carried out relatively quickly.

Beveled tooth

The front plane of the cutting edge, made in this form, ensures cuts with an accurate and even line. The saw is ideal for working with composite type materials: plywood, chipboard (with single-sided and double-sided lamination). After cutting blanks of solid lumber, it is chipped, practically no chips are observed.

There are discs with a beveled leading edge of the cutter, some with a beveled trailing edge, or a variant with alternating teeth (variably beveled blade). When working with a tool with a beveled surface of the trailing edge of the cutting element when cutting hard wood, a clear, high-quality cut is observed, but the saw quickly becomes dull.

Trapezoidal tooth

The main advantage of such a saw is the slow wear of the disc due to the absence of the need for frequent sharpening on a sharpening machine. Typically, the entire blade line consists of alternating cutting elements - straight and trapezoidal teeth working in tandem. The taller trapezoid tooth roughs the cut, allowing the main straight edge to cut more easily. The tool can be used for cutting plastics and hard laminates.

Conical tooth

An auxiliary type of tool designed for cutting materials with a laminated surface prior to the main cut. The operation is carried out to avoid the appearance of chips on the front part of the product. This saw blade is not used as an independent working unit.

Crescent tooth

Blades with a concave tooth shape are convenient for cutting material in the transverse cutting direction relative to the location of the fibers.

• The movement of the workpiece on the work table during cutting occurs with the use of great physical force;
• Cracks and chips are observed along the cut line;
• During operation, the engine overheats;
• There is a burning smell in the air;
• The material burns, which appears as dark areas along the cut line.

If any of these signs are detected, you must immediately begin sharpening your circular saws yourself. Also, before carrying out work, you can check the sharpness of the saw, focusing on tactile sensations or visually using a magnifying glass. The permissible rounding radius of the cutting angle should correspond to a value of 0.1-0.2 mm. When cutting large workpieces, all working edges wear out.

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.

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.

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.

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.

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.

Sharpening saw blades with carbide teeth

Pobedit tips are sharpened using a special machine or a homemade attachment for a grinding wheel. The device is a clamp in which the disc is clamped, maintaining certain sharpening angles relative to the emery. A diamond wheel is considered the best for sharpening a pobedit.

A marker marks any point as a reference point. Position the main working surface of the tooth against the grindstone so that they are in the same plane. Grind each tooth in turn until the entire circle is completed. Rearrange the disk with the auxiliary plane to the grinding wheel. They grind a different plane for each tooth. This is how the carbide-tipped discs are completely sharpened step by step.