How to sharpen a disk on a circular without soldering
How to sharpen a circular saw?
Grinding of a saw disk is possible both with the help of a special machine, and with the help of impromptu tools.
You can sharpen a circular saw yourself, if you follow the instructions then there is nothing particularly difficult about this.
What is needed for this?
It should be borne in mind that all circular saws need correct and timely sharpening, but those that do not have high power should be carefully sharpened. The fact is that a blunt disk helps increase the load on the electric motor. This is the result of the fact that it quickly overheats, and it becomes impossible to work with the tool as it breaks.
The saw blade needs urgent sharpening if it has the following characteristics:
- When cutting, you need to make significant efforts.
- The cutting edges begin to burn, an unpleasant smell appears, dark spots from the teeth of the saw appear.
- The protective cover of the heater starts to heat up very quickly (even when working with such a tool, smoke may appear).
Using a file, each tooth is pointed. Each of them has the same number of movements and equal pressure.
To sharpen the saw blade, you must start with the surface located behind. It is this part during the implementation of the workflow that relates to the processed material. Most preferred is grinding the disc directly in the machine, but it is also possible that when the grinding process needs to be removed for the grinding process.
When you need to sharpen a saw in the device, the cord is pulled out of the socket (this should be done for security reasons, so that the device does not accidentally start). It is necessary to stick the disk, while wooden rods are laid on both sides, they are firmly pressed to the teeth of the saw.
How to grind saw blades
sharpen carbide discs are very simple with the simplest device, but such discs serve the time.
How to quickly sharpen a circular circular saw
my honing method a circular saw (music series by Audionautix
The marker should be marked with a tooth, which will be pointed first. When the first tooth is pointed, it is necessary to remember the number of movements made by the file. This is because all subsequent teeth must be sharpened with the same effort, and the number of movements must be the same.
So, how to sharpen circular saws? If the grinding disc is removed from the machine, it must be clamped in a vice (for this purpose, it is best to use wooden dies). After that, you must perform the same procedures as described above. When the teeth are sharpened, the disc must first rotate in a vise. Doing this is much simpler than it might seem at first glance, you only need to follow the safety rules, otherwise all this can lead to the most negative consequences.
What to consider when sharpening a saw?
After the procedure, the saw blade should be checked for uniform sharpening on a piece of wood.
After the grinding of all teeth has come to an end, the disc is neatly inserted into the machine. Then the machine connects to the network, and an unnecessary wooden block is sawn. If there is loud noise or the material is not evenly fed, then you need to check how close the teeth fit together in height. This is done as follows: the marker must be brought to the cutting edge, the disk rotates a full revolution in the direction that is opposite to the direction of rotation. Then the disk should be examined in the most thorough manner. Each tooth will then be marked so that you can identify those teeth that differ in height. The height of long teeth is neatly aligned with the file.
The saw blade is sharpened better on a special grinder, but for home masters this method of sharpening is not always available. Therefore, the method of grinding a circular saw, which is carried out at home, is more popular.
It should be noted once again that in no case should such a process be delayed, otherwise the tool will fail quickly. And repairs can be very expensive, so at first it’s best to do everything by spending a small amount of time on it.
The fact is that such a tool with a long stretch can be called cheap, so when you buy it once, you need to make every effort to ensure its operation as long as possible. And it’s easy to do this, you just need to regularly take care of such an instrument, and then there will be no problems.
How to properly part and sharpen a circular disk
»How to sharpen
How to sharpen a circular circular saw
- Sharpening circular saws
How to make a tooth teeth
Mechanized sharpening a disk
How to sharpen a circular saw? Circular saw # 8211; it is a necessary tool in the construction of a summer house. It surpasses other types of saws in its accuracy and cut quality. The duration of operation of the structure depends on the quality of its sharpening.
The service life of a circular saw also depends on the quality of its sharpening.
An empty disk increases the load on the mechanism. As a result, it may break.
Periodic sharpening of circular saws is required.
Signs that indicate that the saw needs to be sharpened:
- when cutting, a large load should be applied;
burn the edges of the cut;
smoke appears during operation.
Sharpening circular saws
Materials and tools:
Circular saw blades.
thin wooden cubes;
How to sharpen a circular saw with a disk? The circular saw must be sharpened from the rear surface if it is operated in the blade position, which is turned towards the tree. The front surface, which is on the material when cut, remains unchanged.
You can turn the disc in the machine. You can pull the canvas out of it. If turning is carried out in the device, you need to remove the plug from the electrical outlet to prevent accidental switching on of the device. It is necessary to wedge the product, placing thin whetstones under it on both sides and press them to the teeth.
It is necessary to mark with a marker the element from which they begin to perform turning. When turning, care must be taken and maximum attention should be paid. Turning is performed using a file or diamond file.
It is necessary to remember the number of movements and the applied efforts when turning the first tooth. The same efforts must be made when turning the remaining parts. If the blade was removed from the machine, it is necessary to clamp it in a vice, then grind each tooth in the same way. Then the canvas is installed back into the device.
Perform a cut check on the sample. If noise occurs during operation or the feed is uneven, check the height of the teeth. To do this, bring the marker to the cutting edge. Then you need to slowly turn the canvas by hand 1 turn in the direction opposite to the direction of rotation. In this case, a mark will appear on each tooth. Upon examination, you can find out which elements are higher than the rest. If the difference turned out to be significant, you need to carefully reduce the height of the elements.
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How to make a tooth teeth
Sharpening a tooth of a circular saw on one and two planes.
If it is necessary that the movement of the disk is more free, then perform a tooth bite.
It is necessary to bend all the teeth in turn at the same distance in different directions. The work is done using wiring. Wiring # 8211; It is a tool to perform the divorce of elements. To perform the wiring, you can use an adjustable wrench. When working with softwood, they are bred more. When working with hard rocks # 8211; smaller.
To choose the right wiring, you need to test the device when cutting strong wood. The best wiring option would be approximately 0.3 # 8211; 0.5 mm one way. The main requirement is the wiring of the elements no more than the thickness of the canvas on both sides. The wiring is performed before sharpening.
In the case when it is necessary to turn the blade of a higher quality, a machine for mechanized turning is used.
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Mechanized sharpening a disk
Materials and tools:
machine for sharpening the disc;
How to sharpen a circular saw in a mechanized way? There are a large number of different machines. Some mechanisms have software packages to provide a fully automated turning mode. In the home workshop, when the turning of the discs is episodic, you can use a simpler device.
Sharpening angles of the teeth of a circular saw: rake angle (γ), rear (α) and bevel angles of the front and rear planes (ε1 and ε2).
How to sharpen a disk? In such a machine, after its installation and fixing in a position that provides the necessary sharpening angle, all other operations # 8211; rotation of the blade around its axis, control of the thickness of the metal removed from the tooth # 8211; performed manually.
Sharpening a straight tooth in the front plane is performed in this sequence. Set the canvas on the frame of the machine. Clamp with a centering sleeve. Then, using the mechanism, it is installed in a strictly horizontal position. Thus, a bevel angle of the front plane of zero is ensured. If the machine does not have a built-in angle scale, the horizontality of the disk is checked using a pendulum protractor.
Then rotate the screw of the mechanism, which provides horizontal movement of the frame with a circle. Set the required rake angle. The canvas moves in a position in which the front plane of each element fits snugly against the working surface of the circle.
Marker make the mark of the first tooth, from which they begin to sharpen. Then turn on the engine and sharpen the front plane. The machine enters the tooth in contact with the circle and performs several movements of the blade back and forth with the simultaneous pressing of the element to the circle.
After sharpening one element, the blade is brought out of contact with the abrasive wheel, rotated by one element. Then the operation is repeated in a similar manner. So the machine works until the element marked with a marker completes a full circle, showing that all elements are sharpened.
Sharpening a chamfered tooth differs from direct turning in that the saw is positioned with a slope equal to the bevel angle of the front plane. To sharpen the element along the rear plane, it is necessary that the machine allows the blade to be installed so that the rear plane of the element is in the same plane with the surface of the circle.
To sharpen a circular saw on the machine, you do not need to have special skills. Anyone can handle this work if he follows all the instructions and rules for working with machine tools for sharpening disks.
Sharpening a saw
Let’s go over the material of how to sharpen a saw on a tree or sharpen a circular saw.
Sharpening saws on wood
Saw on wood is the most important tool in the hands of a specialist, which should work properly and reliably, especially if the saw is correctly sharpened. However, when buying this product, the consumer is not always satisfied with its severity. Saws for working with wood often go on sale blunt. To a large extent, this applies to coarse teeth. Therefore, the issue of sharpening remains relevant for those who wish to achieve effective work of the saw.
It is known that there are different forms of sharpening for each type of work.
- The saw must first be diluted if it is not sufficiently diluted. It is better to do this using specialized wiring. But if such a detail is not at your disposal, then you can use pliers.
The saw is clamped with its teeth up, the operator must perform actions so as to see the entire process along the blade.
Then you need to bend every second tooth in different directions, each movement accompanied by the inclination of the pliers at an equal angle.
Often, wiring to a small extent is already present initially. The owner of the saw simply needs to increase it if it comes to raw wood or large saws. In the event that the saw is small and designed to perform work requiring high accuracy, then the factory wiring is quite enough.
In the process of sharpening a saw on a tree, you need a file that has three faces.
A triangular file is used to sharpen the teeth. This process is carried out from the inner surface in relation to the layout of the teeth of the saw. The file is placed at an angle in the cutting edge. The value of this angle should be sixty to forty-five degrees.
In practice, it is much more efficient to first sharpen one side of the teeth, and then, turning the saw over, sharpen them on the other side. Thus, a person makes the same type of movement, which makes it possible to sharpen a saw faster and more efficiently.
When sharpening saws, it is necessary to observe the most important rules, which not only allow you to achieve a higher effect, but also ensure safety. To do this, when sharpening saws, it is necessary:
- exclude any noise background or communication with other people,
you should turn off the radio and television, thus achieving complete silence, creating a situation in which no one can distract you.
Otherwise, any careless movement or reaction of a person to a sound distracting him can lead not only to damage to the instrument, but also to irreparable consequences, causing damage to human health.
Experts advise you to pay attention when the saw goes to the side when cutting. This indicates an uneven alignment of the teeth, which must be corrected by increasing their deviation from the side to which the saw is pulled.
Saw blade sharpening
The circular saw is sharpened from the back if you are working in the position facing the material being processed.
- The front surface running onto the material during sawing remains unchanged.
You can sharpen the disc directly in the machine. Alternatively, you can remove it from the machine or the circular saw.
In the first option, you first need to pull the plug out of the socket to prevent the consequences of starting the machine, which can happen by accident.
It is necessary to wedge the disk, for which thin wooden pieces must be put on both sides of it and pressed down to the teeth.
A marker is necessary to mark the side of the tooth, from which you will begin to sharpen. This will allow you to prevent mistakes in such a responsible work.
Attention and utmost care must be taken.
It is important to remember the number of movements that you make when sharpening the first tooth, while you used a file or a diamond file.
You will need the same efforts in order to sharpen all other teeth.
If you removed the disk from the machine, it must be clamped in a vice to do the same activities that you read about above.
Next, the disk returns to the machine, an unnecessary piece of wood is cut. It is necessary to check the height of the teeth if your work was accompanied by a loud noise or a rough feed was characteristic. This can be done by raising the marker to the cutting edge and turning the disc with your hand in slow rhythm by one revolution per side opposite the direction of rotation. Each tooth will receive a mark; when examining a disk, it will be revealed which teeth are higher than the others. With a significant difference, you must carefully reduce their height.
Tooth bite is performed when it is required to provide more free movement of the saw blade. The teeth in turn are bent in different directions at the same distance using the wiring. With it, the tooth is bent off approximately at the middle of its height. The wiring is a tool for making a saw tooth divorce, it has the shape of a plate, in which there is a slot.
You can also use an adjustable wrench, which also successfully completes the tooth alignment.
To work with soft wood species, the teeth need to be bred more, in the case of hard. less. But this advice is unlikely to be useful to someone who works directly in the forest. Under these conditions, the degree of hardness, density and moisture of the trees is hardly possible.
In order to choose the right wiring, you will have to test this device in different conditions, the best option would be three tenths. five tenths of a millimeter in one direction. The general requirement is to set the teeth no more than the thickness of the blade on two sides. Wiring must be done before sharpening.
Sharpening and wiring the saw
The main cutting element of any hand saw is a series of teeth cut on the blade and representing cutters in the form of wedges. Wood, in the manufacture of all kinds of products from it, is sawed lengthwise, crosswise and at an angle Θ to its fibers, in this regard, transverse, longitudinal sawing and sawing are distinguished at an angle to its fibers and in each case they use the corresponding type of saw different from other forms teeth.
a. transverse sawing; b. longitudinal sawing; 1. wood; 2. cut; 3. marking line for sawing; Θ is the angle of inclination of the marking to the wood fibers with mixed sawing.
For transverse sawing, transverse saws are used, the cutting edges of the teeth of which, when moving in the wood, cut its fibers like a knife and form a cut. Longitudinal sawing differs from transverse in that the direction of movement of the saw is parallel to the wood fibers. The leading edges of the teeth of the longitudinal saws plan the wood, like knives in planers, and, deepening, form a cut. When sawing wood at an angle Θ, universal (mixed) saws with teeth are used to its fibers, which are an intermediate form of teeth of transverse and longitudinal saws.
Sharpening a saw
In the process, the saw teeth become dull, the cutting front and side edges are rounded, the saw travel becomes heavy and you have to put a lot of pressure on it. Experienced craftsmen can easily determine its sharpness by the brilliance of the cutting edges and tops of the teeth and the sound of the saw. To restore the cutting ability of the teeth, they are ground with files or files, giving them sharpness and preserving their parameters: angles, steps and heights.
Sharpening teeth saws. a kind of art that requires loyalty to the hands, a good eye, attention. It is not difficult to learn this business, you must have a desire and clearly adhere to the following rules:
- The saw blade must be rigidly fixed in a special device made of wood, which is also stably installed on a well-lit work table. Sharpening saw teeth on stools or on the knees does not give a satisfactory result.
You should use a personal file with the subsequent cleaning of the sharpened edges of the teeth with velvet (with a small notch) or file. It is advisable that the file is new, sharp and with a mounted handle. If at the right time it wasn’t, then you can use a used, but always brushed with steel brush and rubbed with charcoal so that the file does not clog and dull. When sharpening a tooth, the file should cling to its metal and remove its layer, depending on the pressure. And if it slides along the tooth without removing the metal, then the saw teeth are overheated or the file is worn out. In this case, it is necessary to repeat the sharpening with a new file. If in this case it slides along the tooth, it remains to take another saw.
The file handle is clamped with the right hand, and the end is held with the left hand and the file is sent to the saw teeth. The file operation is described below, depending on the type of saw.
The file pressure on the teeth should be smooth and uniform and only one way away from you. When the file returns to its original position, it should not touch the teeth.
It is necessary to try to grind metal from the edges of the teeth of at least the same thickness, driving the file the same number of times with the same pressure, which allows you to save the angles, pitch and height of the teeth after sharpening.
Burrs are formed on the sides of the tooth on the file exit side, which reduce the sharpness of the tooth, and if they are not removed, then during the operation of the saw they become chipped, and the teeth become significantly dull. To remove the burrs, the edges of the teeth are ground with a file with a velvet notch and the burrs are removed from the side faces with a wet donkey.
After sharpening the teeth, check their sharpness. Look at the point of the needle and the edge of the razor blade: they, sharpened, do not shine in the light. And if you dull them, then rounded surfaces appear on the tip of the needle and on the edge of the blade, which reflect light well and shine. This principle is based on the quality control of sharpening the teeth of saws. To do this, put a saw in front of the eyes and examine its teeth along the blade. If their cutting edges and tops do not shine, then the saw teeth are sharpened satisfactorily, and if some of the teeth are glossy (this often happens), they must be ground with a velvet file, remove burrs and again check the reflection of light with their edges and tops.
Cross saws. The teeth of the transverse saws are sharpened using a trihedral file with a fine notch with an angle at the apex of 60 °.
To sharpen the teeth, the saw is clamped in a special device that allows you to set its blade at an angle of 45-50 ° to the plane of the working table. The file is led parallel to the work table at an angle of 60-75 ° to the saw blade and thus the left edge A is sharpened in the first tooth1 A2 IN2 IN1.
Sharpening the cross saw:
1. saw blade; 2. sharpened tooth; 4. a device for sharpening; 5. a desktop for sharpening saws; 6, 8. file direction 7 with respect to the desktop and the sharpened teeth of the saw; 9. fishing line bending teeth when they are divorced
Sharpen the saw teeth in several steps. First, a file passes along the left sides of the odd teeth located in the far row, adjusting the hands to the same movement. Then they pass a file along the right sides of the same odd teeth, completing the sharpening of the main cutting edges with very sharp peaks. After the sharpening of the odd teeth, the saw blade in the grinding device is turned over and thus the even teeth that are in the far row are sharpened. When sharpening the teeth of the transverse saws, it is necessary to carefully monitor that in each tooth sharp main cutting edges with a dihedral angle of φ = 60-75 °, a short cutting edge and a sharp top are obtained.
Longitudinal saws. Teeth of longitudinal saws in which the angle
Sources: http://masterbrusa.ru/instrumenty/kak-zatochit-cirkulyarnuyu-pilu.html, http://www.lobzikov.ru/look_112.html, http://tool-land.ru/zatochka-pily. php
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How to sharpen a circular saw: rules of work
The circular saw blade consists of a steel blade (disk body) and carbide-tipped plates in the form of cutters, the shape of which can be different. To properly sharpen the disk, you need to know the geometry of the tooth and the basic rules of sharpening.
To properly sharpen the disk, you need to know the geometry of the tooth, as well as the basic rules of sharpening.
The geometry of the teeth of the saw blades
Circular saws are made of durable grades of steel, on the body of which carbide plates are attached using high-temperature soldering. The alloys for the manufacture of these solders can be different. Domestic manufacturers mainly use alloys of tungsten with cobalt. Foreign manufacturers use their technological compositions. The characteristics of this or that composition will depend not only on its chemical characteristics, but also on the size of the carbide phase grain used. Small grit will provide the highest hardness and strength parameters that the material will possess.
The teeth of a circular saw can have various geometric shapes. Among them, several main forms are distinguished:
Different discs for different materials.
- The tooth is straight.
- Oblique tooth shape.
- Trapezoidal tooth shape.
- The tooth is conical in shape.
Saws that have straight teeth are used for fast longitudinal sawing. At the same time, the quality of such a cut will be quite low.
An oblique tooth may have a right or left angle. Very often, circular saws can be made with alternately chamfered teeth, i.e. when the teeth with the left and right angles will be repeated in turn. Such saws are used for cutting chipboard in the longitudinal and transverse directions. Such a structural form will allow avoiding the appearance of various chips on the surface of the processed material. A saw whose tooth is made in the form of a trapezoid can be used for sawing MDF material. A feature of such saws is the low wear of the tooth material and a sufficiently low cutting speed. Very often, trapezoid-shaped teeth alternate with straight teeth, which are used for cleaner cutting.
Saws with conical shaped teeth are used for auxiliary work when cutting the upper or lower laminated layer. Such a saw will protect against chipping and preserve the surface of the processed material.
An oblique tooth may have a right or left angle.
To understand how to sharpen the disc correctly, you need to know that the main wear of his tooth falls on the upper cutting edge. This edge is rounded during operation. The size of the rounded layer can reach up to 0.2-0.3 mm. The front edge of the surface also wears out quickly.
To perform such work, you will need the following equipment:
- Sharpening machine.
- Pendulum goniometer.
Video: How to sharpen a disk on a circular without soldering
The process of sharpening a saw having a straight tooth needs to be performed on a plane located in front. To do this, it must be installed in the mandrel in a horizontal position.
Then, using the adjusting screws located on the sharpening machine, it is necessary to set the required angle at which sharpening will be carried out. The saw blade must be moved in such a way as to ensure the closest fit to the surface of the abrasive wheel.
The thickness of the layer removed from the material will be controlled by the force of the clamp. After the first tooth is sharpened, the disc should be retracted from the grinding wheel. After that, it is necessary to rearrange it by one step and continue the process. So in succession it is necessary to sharpen all carbide inserts.
Sharpening a circular saw.
Sharpening the chamfered surface of carbide brazing can be performed both on its front plane and on the back. The difference from sharpening solder discs having a straight surface will be that such a saw blade must be positioned at an angle that will correspond to the angle of inclination of the tooth.
To determine the required installation angle, it is necessary to use a pendulum goniometer. Initially, you need to set an angle with a positive value (8, 10, etc.). Sharpening must be done through the tooth, so the first half of the disc plates is processed. After completing this work, the required angle of inclination is changed to negative and the second half of the teeth is machined.
The back plane of solders is a little harder to sharpen. To do this, you need a machine whose design will allow you to install a circular saw so that the rear plane of the teeth of the saw is parallel to the plane of the grinding wheel.
Work without a machine and the quality of work performed
You can grind a circular saw not only with the help of a special machine, but also with auxiliary means. This method can be used when there is no money and desire to purchase a sharpening machine. Most people use such a hand tool infrequently, so there is no need to buy additional devices.
In the event that there is a conventional emery machine, you can perform all the required procedures with it. For convenience, you need to make a device that will fix the saw in the required position relative to the abrasive element. For this, a conventional metal stand is suitable, the surface of which will be located at the same level with the axis of the abrasive wheel.
On this stand you need to put the circular saw blade so that it lies in the necessary plane relative to the surface. Fastening it can be done with the help of bolts, which at the same time will help to adjust the angle of inclination.
The absence of chips and various cracks on the surface of the saw will help to verify the quality of the work performed. The radii of rounding of all cutting edges must be within the following boundaries: 0.012-0.015 mm. When conducting a visual inspection, there should be no glare on their surface.
Observing the rules of the work, you can confidently use a circular saw without frequent replacement of saw blades. And their cutting part will perform a quality cut of the necessary products and materials without spoiling their surface.
Do-it-yourself sharpening a circular saw: file processing method
The circular saw, which is still called circular according to old memory, is an indispensable tool for the owner of a private home ownership. It copes equally well with wood and drywall, non-ferrous metal or acrylic glass, but one of the conditions for high-quality and trouble-free operation is regular sharpening of the cutting disc. The cleanliness and durability of this tool is much higher than other types of tools for sawing hard materials.
Circular saw (circular) is designed for cutting a wide variety of materials. In the process, the teeth become dull and need to be sharpened correctly.
The circular is in no way inferior to the chain chainsaw popular among the population, and even in many ways surpasses it in capabilities. With its help, it is possible to produce transverse, longitudinal or inclined cutting of the material necessary for the construction or manufacture of carpentry. The number of teeth on the circular saw blade depends on the hardness of the material being processed, but in any case, its correct movement can be ensured only by correct wiring and sharpening of the teeth.
Signs of wear on the saw blade
Circular saws, subject to all operating rules and careful maintenance, are reliable and durable, but, like any tool, they require preventative maintenance from time to time. If during the operation of this equipment difficulties became noticeable and dark marks appeared on the surface of the material, it means that the edges of the cut burn out from excessively heated saw teeth. In combination with smoke and an unpleasant odor during operation, which can occur from overheating of the engine cover, this most likely indicates that the tool requires immediate sharpening.
Timely sharpening of circular saws to a large extent affects the smooth operation of the electric motor.
Circuit diagram for circular.
A dull disk increases the load on the mechanism many times and can lead to its complete failure. The main degree of wear is on the upper cutting edge of the teeth on the circular saw blade. To blunt the tool does not become excessive, you should regularly check the radius of rounding of the cutting edge, which according to the rules should not exceed 0.1-0.2 mm. It is possible to determine that urgent sharpening of a circular saw is necessary also in the form of the cut itself. Regular sharpening of the disc will not only extend the uptime of the equipment, but will also increase productivity, as well as reduce the time and effort that is required to put in order a completely worn tool.
Do-it-yourself sharpening a circular saw
The method of sharpening the circular disc depends on the availability of the necessary tools at hand. If it is not possible to use a special machine for this purpose, then a good result can be achieved by having a minimal set of files, a vise and a pair of wooden blocks for fixing the disk.
Circular grinding disk circular on the machine.
Sharpening the part will be more convenient if you do not remove it from the machine, but first you need to remember to disconnect the equipment from the power supply. To begin with, it is necessary to ensure reliable fixation of the disk using wooden blocks placed under it on both sides. The toothed disc, located separately from the saw, is placed in a vice, holding it with wooden wedges. It is better to mark the first tooth from which the treatment begins, using a bright marker, so as not to perform actions on the second round.
Start work from the back. When sharpening the teeth, it is necessary to control the uniformity of the applied efforts as much as possible and try to observe the same number of file movements in each case. In order to train your hand in this action, you can use the old hacksaw to start with, which will not be a pity to spoil.
Checking the quality of the blade sharpening is carried out with a trial cut. Uneven material advancement and extraneous noise may indicate that the teeth are at different levels. This can be revealed by bringing the marker close to the cutting edge of the disc and making it a complete revolution in the direction opposite to normal work. Prongs that have been marked require re-file processing.
Did not find the answer in the article? information on the topic:
How to Grind Circular Disk at Home AURAMM.RU
Sharpening circular saws
Material and properties of carbide teeth
In domestic saws, sintered tungsten-cobalt alloys of grades (6, 15, etc., are used as a material for cutting inserts), the figure means the percentage of cobalt). 6 has a hardness of 88.5 HRA, and 15 has 86 HRA. Foreign manufacturers use their alloys. Hard alloys consist mainly of cobalt cemented tungsten carbide. The characteristics of the alloy depend not only on its chemical composition, but also on the grain size of the carbide phase. The smaller the grain, the higher the hardness and strength of the alloy.
Hard alloy plates are attached to the disk by high temperature soldering. As soldering material, silver solders (PSr-40, PSr-45) are used, in the worst case, in the worst case. copper-zinc solders (L-63, MNMC-68-4-2).
Carbide tooth geometry
In the form, the following types of teeth are distinguished.
Straight tooth. It is usually used in saws for longitudinal fast sawing, the quality of which is not particularly important.
Inclined (oblique) tooth with left and right angle of inclination of the rear plane. Teeth with different angles of rotation alternate among themselves, due to the fact that they are called alternating. This is the most common tooth shape. Depending on the size of the grinding angle, saws with alternating teeth are used for sawing a wide variety of materials (wood, chipboard, plastics). both in the longitudinal and in the transverse directions. Saws with a large angle of inclination of the rear plane are used as cutting when cutting plates with double-sided lamination. Their use allows to avoid chips along the edges of the section. Increasing the bevel angle reduces the cutting force and reduces the risk of chipping, but at the same time reduces the strength and strength of the tooth.
Teeth may be prone not only to the rear, but also to the front plane.
Trapezoidal tooth. A feature of these teeth is the relatively slow blunting speed of the cutting edges compared to alternating teeth. They are usually used in combination with a straight tooth.
Moving with the latter and rising slightly above it, the trapezoid tooth performs through cutting, and the straight line following it is clean. Saws with alternating straight and trapezoidal teeth are used for cutting plates with double-sided lamination (chipboard, MDF, etc.), as well as for sawing plastics.
Conical tooth. Saws with a conical tooth are auxiliary and are used to fence the bottom layer of the laminate, which protects it from chips during the passage of the main saw.
In the vast majority of cases, the front side of the teeth is flat, but there are saws with a concave front surface. They are used for finishing cross cutting.
Tooth grinding angles
The grinding angles are determined using a saw. that is, for cutting the material and in which direction it is intended. Saws for longitudinal sawing have a relatively large rake angle (15 °.25 °). In transverse saws, the angle γ usually ranges from 5-10 °. Universal saws designed for transverse and longitudinal sawing, have an average value of the rake angle. usually 15 °.
The values of the grinding angles are determined not only by the direction of cutting, but also by the hardness of the saw material. The higher the hardness, the smaller the front and rear angles (less tooth narrowing).
The rake angle can be not only positive, but also negative. Saws with this angle are used for cutting non-ferrous metals and plastics.
The basic principles of sharpening
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When sawing massive workpieces, the side surfaces also undergo rapid wear.
Do not drive the saw. The radius of curvature of the cutting edge must not exceed 0.1-0.2 mm. In addition to the fact that when the blade is very blunt, productivity drops sharply, in order to grind it, it takes several times more time than sharpening the blade with normal blunting. The degree of blunting can be determined both by the teeth themselves and by the type of incision they leave.
The correct sharpening of circular saws should ensure, at the same time, that the cutting edge is properly sharpened to provide the maximum number of cutters, which in the best case can reach 25-30 times. For this purpose, it is recommended to use a carbide tooth, which should be grinded along the front and rear planes. In fact, the teeth can also be ground along one frontal plane, but the amount of possible grinding is almost half as much as when grinding on two planes. The figure below clearly shows why this is happening.
The last run when sharpening the saw blades is recommended to be done on the back plane of the tooth. The standard metal removal value is 0.05-0.15 mm.
Before sharpening, it is necessary to clean the saw from dirt, such as resin, and check the values of the grinding angles. On some saws, they are written to disk.
Equipment and materials for sharpening saw blades
When using abrasive discs (especially diamond wheels), it is advisable to cool them.
As the temperature rises, the microhardness of the abrasive materials decreases. Raising the temperature to 1000 ° C reduces the microhardness by almost 2-2.5 times compared with microhardness at room temperature. An increase in temperature to 1300 ° C leads to a decrease in hardness of abrasive materials by almost 4-6 times.
How to sharpen your saw blades yourself with a simple tool
Sharpen carbide drives very easily with the help of a simple device, and such drives times.
Sharpening saw blades yourself
Dull saw disk on my Makite 2704. Finance for the purchase drive from Makita or SMT at the moment no.
Using cooling water can lead to rust on machine parts and components. To eliminate corrosion, water is added to soap and water, as well as some electrolytes (sodium carbonate, soda ash, trisodium phosphate, sodium nitrite, sodium silicate, etc.), which form protective films. With normal grinding, soap and soda solutions are most often used, as well as for fine grinding, low-concentration emulsions.
However, when grinding saw blades at home with a low intensity of grinding work, the circle does not resort to cooling very often, not wanting to spend time on it.
To increase the grinding ability of abrasive discs and reduce specific wear, you should choose the largest grain size, which ensures the required cleanliness of the surface of a pointed tooth.
To select the grain size of the abrasive, in accordance with the grinding stage, you can use the table in the article on grinding rods. For example, if you use circles with diamonds, you can use circles with a grain size of 160/125 or 125/100 for finishing for roughing. 63/50 or 50/40. Circles with grain sizes from 40/28 to 14/10 are used to remove the teeth.
The peripheral speed of the circle when grinding carbide teeth should be about 10-18 m / s. This means that when using a circle with a diameter of 125 mm, the engine speed should be about 1500-2700 rpm. Sharpening of more brittle alloys is performed at a lower speed from this range. When sharpening carbide tools, the use of hard modes leads to the formation of increased stresses and cracks, and sometimes to grinding of the cutting edges, while wheel wear increases.
When using grinding machines with a saw, changing the relative position of the saw and grinding wheel can be done in different ways. by moving one saw (the engine with the circle is stationary), while moving the saw and the engine, moving only the engine with the circle (saw blade is stationary).
A large number of grinders of various functions are produced. The most complex and expensive programmable systems are able to provide a fully automatic grinding mode, in which all operations are performed without the participation of a worker.
In the simplest and cheapest models, after installing and fixing the saw in a position that provides the required sharpening angle, all further operations turn the saw around its axis (turning the tooth), feeding it to grinding (bringing it into contact with the wheel) and controlling the thickness of the saw metal. made by hand. It is advisable to use such simple models at home when sharpening circular saws is occasional.
An example of the simplest grinding saw machine is a system, a photograph of which is shown in the photograph below. It consists of two main blocks. an engine with a circle (1) and a support (2) on which a pointed saw is mounted. The rotating mechanism (3) serves to change the angle of the blade (when grinding teeth). Using the screw (4), the saw moves along the axis of the abrasive wheel. This ensures that the set front grinding angle is set. The screw (5) is used to set the stopper in the desired position, preventing the circle from getting into the interdental cavity excessively.
The process of sharpening saw blades
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The saw is mounted on a mandrel clamped with a conical (centering) sleeve and nut, and then installed in a strictly horizontal position using the mechanism (3). This provides an angle of inclination of the front plane (ε1) is equal to 0 °. In machines for grinding disks that do not have a built-in angle scale in the tilt mechanism, this is done using a conventional pendulum goniometer. In this case, check the horizontal position of the machine.
The rotation of the screw (4) of the mechanism for horizontal movement of the mandrel with a circle sets the required cutting angle. In other words, the saw moves to a position where the front plane of the tooth fits snugly against the working surface of the circle.
Marker marks the tooth from which the grinding begins.
The engine is turned on, and the front plane is pointed by inserting the tooth into contact with the circle and several movements back and forth while pressing the tooth on the circle. The thickness of the removed metal is controlled by the number of grinding movements and the force of pressing the tooth on the abrasive wheel. After sharpening one tooth, the saw is removed from contact with the wheel, it includes one tooth and the sharpening operation is repeated. And so on, until the marker marker makes a full circle, showing that all teeth are pointed.
Tooth sharpening tilted in front. The difference between sharpening a chamfered tooth and sharpening a straight tooth is that the saw cannot be installed horizontally, but with a slope at an angle corresponding to the angle of inclination of the front plane.
The angle of the saw blade is set using the same pendulum goniometer. First, a positive angle is set (in this case, 8 °).
After that, every second tooth is sharpened.
After grinding half the teeth, the angle of inclination of the saw blade changes from 8 ° to 8 °.
And every second tooth is sharpened again.
Sharpening the rear plane. To sharpen a tooth on the back plane, it is necessary that the grinding machine of the saw blade allows the saw to be mounted so that the back plane of the tooth is in the same plane with the wheel.
If there is no machine for sharpening saw blades
By precisely keeping the necessary sharpening angles, holding the saw in your hands from the weight. the task cannot be repaired even for a person with a unique eye and enviable stiffness of hands. The most reasonable in this case is the simplest device for sharpening, which allows you to fix the saw in a certain position relative to the circle.
The simplest of these tools for grinding circular saws is a stand, the surface of which is at the same level as the axis of the grinding wheel. By placing the saw blade on it, you can make sure that the front and back planes of the tooth are perpendicular to the saw blade. And if the top surface of the stand is made movable. securing one side hinged and the other. relying on a pair of bolts that can be screwed on and off. then they can be installed at any angle, having the ability to sharpen an inclined tooth along the front and rear planes.
However, in this case, one of the main problems remains unresolved. exposure of the same front and rear sharpening angles. This problem can be solved by fixing the center of the saw with respect to the abrasive wheel in the desired position. One way to do this. make a groove on the surface of the mandrel support on which the saw is mounted. Moving the frame with a circle in the groove, it will be possible to maintain the required angle of cut of the tooth. But for sharpening circular saws of different diameters or sharpening angles, it should be possible to either move the engine or support, and with it the groove. Another way to provide the desired sharpening angle is simpler and set on the step of the stops that fix the disk in the desired position. At the end of the article there is a video demonstrating such an adaptation.
Sharpening quality control
GOST 9769-79 sets certain tolerance values for grinding parameters. The final impacts of the tips of the teeth should not exceed 0.2 mm (for saws with a diameter of up to 400 mm), radial. 0.15 mm. The runout is checked using a conventional indicator.
The deviation of the grinding angles should not exceed:
- for the front corner. ± 1 ° 30 ‘;
- for the rear and tilt angles of the front and rear planes. ± 2 °;
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How to Sharpen a Circular Saw
Sharpening circular saws
Material and properties of carbide teeth
In domestic saws, sintered tungsten-cobalt alloys of grades are used as material for cutting inserts (6, fifteen not the other figure indicates the percentage of cobalt). Six has a hardness of 88.5 HRA, and 15. Eighty-six HRA. Foreign Russian> auto industry use their alloys. Hard alloys consist mainly of cobalt cemented tungsten carbide. The characteristics of the alloy depend not only on its chemical composition, but also on the grain size of the carbide phase. The smaller the grain, the higher the hardness and strength of the alloy.
Carbide plates are fastened to the disc by high temperature soldering. Most likely, silver solders (PSr-40, PSr-45) are used as the soldering material, in the worst case. copper-zinc solders (L-63, MNMTS-68-4-2).
Carbide tooth geometry
The following types of teeth are distinguished in shape.
Straight tooth. It is usually used in saws for longitudinal fast sawing, in which quality is not of particular importance.
Oblique (beveled) tooth with left and right angle of inclination of the rear plane. Teeth with different angles of rotation alternate with each other, which is why they are called alternately chamfered. This is the most common tooth shape. Depending on the size of the sharpening angles, saws with an alternating cut tooth are used for sawing a wide variety of materials (wood, chipboard, plastics). both in the longitudinal and transverse directions. Saws with a large angle of inclination of the rear plane are used as cutting saws when cutting boards with double-sided lamination. Their use avoids chipping of the coating at the edges of the cut. Increasing the bevel angle reduces the cutting force and reduces the risk of chipping, but at the same time reduces the resistance and strength of the tooth.
The teeth may tilt not only the back, but also the front plane.
Trapezoidal tooth. A feature of these teeth is the relatively slow blunting speed of the cutting edges in comparison with the alternately chamfered teeth. They are usually used in combination with a straight tooth.
Alternating with the latter and slightly rising above it, the trapezoidal tooth performs rough sawing, and the straight line follows it. fine. Saws with alternating straight and trapezoidal teeth are used for cutting plates with double-sided lamination (chipboard, MDF, etc.), as well as for sawing plastics.
Conical tooth. Saws with a conical tooth are auxiliary and are used to cut the bottom layer of the laminate, protecting it from chips during the passage of the main saw.
In the vast majority of cases, the front edge of the teeth is flat, but there are also saws with a concave front edge. They are used for fine cross cutting.
Sharpening angles are determined by the purpose of the saw. those. what cutting material and in which direction it is intended. Saws for longitudinal sawing have a relatively large rake angle (15 °.25 °). For saws transverse sawing angle γ usually ranges from 5-10 °. Universal saws designed for transverse and longitudinal sawing have an average value of the rake angle. usually 15 °.
The sharpening angles are determined not only by the direction of cut, but also by the hardness of the material being cut. The higher the hardness, the smaller the front and rear angles should be (less tooth sharpening).
The rake angle can be not only positive, but also negative. Saws with this angle are used for cutting non-ferrous metals and plastics.
The basic principles of sharpening
When sawing massive workpieces, lateral faces also undergo rapid wear.
Excessive blunting of the saw should not be allowed. The radius of rounding of the cutting edge must not exceed 0.1-0.2 mm. In addition to sharply reduced productivity when working with a very blunt saw, sharpening it takes several times longer than sharpening a saw with normal bluntness. The degree of bluntness can be determined both by the teeth themselves, and by the type of cut that they leave.
The correct sharpening of circular saws is to simultaneously ensure the proper sharpness of the cutting edge, to ensure the maximum number of sharpenings, which in the best case can reach 25-30 times. For this purpose, a carbide tooth is recommended to be sharpened on the front and rear planes. In fact, the teeth can be sharpened one at a time front plane, but at the same time the number of possible sharpenings is almost two times less than when sharpening in two planes. The figure below illustrates why this is happening.
The last pass when sharpening the saw blades is recommended to be done along the back plane of the tooth. The standard amount of metal removal. 0.05-0.15 mm.
Before sharpening, clean saw from dirt, such as resin, and check the sharpening angle values. On some saws they are written on the disc.
Equipment and materials for sharpening saw blades
When using abrasive wheels (especially diamond), it is desirable to cool them with coolant.
With increasing temperature, the microhardness of abrasive materials decreases. Raising the temperature to 1000 ° C reduces the microhardness by almost 2-2.5 times compared with microhardness at room temperature. An increase in temperature to 1300 ° C causes a decrease in hardness of abrasive materials by almost 4-6 times.
How to sharpen your saw blades yourself with a simple tool
Sharpening carbide discs is very easy with the simplest tool, and such discs serve once.
The use of cooling water can lead to rust on parts and components of the machine. To eliminate corrosion, soap and certain electrolytes are added to the water (sodium carbonate, soda ash, trisodium phosphate, sodium nitrite, sodium silicate, etc.), which form protective films. In conventional grinding, soap and soda solutions are most often used, and in fine grinding. low concentrated emulsions.
However, when sharpening saw blades at home with a low intensity of grinding work, cooling the circle is not resorted to so often. not wanting to waste time on it.
To increase sharpening productivity with abrasive wheels and reduce specific wear, it is necessary to choose the highest grit, which ensures the required cleanliness of the surface of the sharpened tooth.
To select the grain size of the abrasive, in accordance with the stage of sharpening, you can use the table in the article about bars for sharpening. For example, in the case of using diamond wheels, circles with a grain size of 160/125 or 125/100 can be used for rough grinding, for finishing. 63/50 or 50/40. Wheels with grain sizes from 40/28 to 14/10 are used to remove nicks.
The peripheral speed of the circle when grinding carbide teeth should be about 10-18 m / s. This means that when using a circle with a diameter of one hundred twenty-five mm, the engine speed should be about 1500-2700 rpm. Sharpening of more brittle alloys is performed at a lower speed from this range. When sharpening carbide tools, the use of hard conditions leads to the formation of increased stresses and cracks, and sometimes to chipping of the cutting edges, while the wear of the wheel increases.
When using machines for sharpening circular saws, changing the relative position of the saw and the grinding wheel can be implemented in different ways. moving one saw (the engine with the circle is stationary), simultaneously moving the saw and the engine, moving only the engine with the circle (saw blade is stationary).
A large number of grinding machines of various functionality are produced. The most complex and expensive programmable systems are able to provide a fully automatic sharpening mode, in which all operations are performed without the participation of a worker.
In the simplest and cheapest models, after installing and securing the saw in a position that provides the necessary sharpening angle, all further operations. turning the saw around its axis (turning on the tooth), feeding it to grinding (bringing it into contact with the wheel) and controlling the thickness of the metal removed from the tooth. are made by manual workers. Such simple models are advisable to use at home, when the sharpening of circular saws is episodic in nature.
An example of the simplest machine for sharpening circular saws is the system, a photograph of which is presented in the photo below. It consists of two main nodes. engine with a circle (1) and a support (2) on which the sharpened saw is installed. The rotation mechanism (3) serves to change the angle of inclination of the blade (when sharpening teeth with a beveled front plane). Using the screw (4), the saw is shifted along the axis of the abrasive wheel. This ensures that the required value of the rake angle is set. The screw (5) is used to set the stopper in the desired position, preventing the circle from entering the interdental cavity excessively.
The process of sharpening saw blades
The saw is mounted on a mandrel, clamped with a cone (centering) sleeve and nut, then set in a strictly horizontal position by means of a mechanism (3). This ensures a bevel angle of the front plane (ε1) equal to 0 °. For disc sharpening machines that do not have a built-in angle scale in the tilt mechanism, this is done using a conventional pendulum protractor. In this case, check the horizontal position of the machine.
By rotating the screw (4) of the mechanism that provides horizontal movement of the mandrel with a circle, the necessary rake angle is set. In other words, the saw moves to a position in which the front plane of the tooth fits snugly against the working surface of the circle.
A marker is used to mark the tooth from which sharpening begins.
The engine turns on and the front plane is sharpened. putting the tooth in contact with the circle and several movements of the saw back and forth while pressing the tooth against the circle. The thickness of the removed metal is controlled by the number of grinding movements and the force of pressing the tooth against the abrasive wheel. After sharpening one tooth, the saw is brought out of contact with the wheel, it is turned on one tooth and the sharpening operation is repeated. And so on until the marker mark makes a full circle, indicating that all the teeth are sharpened.
Sharpening the tooth, beveled on the front plane. The difference between sharpening a chamfered tooth and sharpening a straight line is that saw must be installed not horizontally, but with a slope. with an angle corresponding to the angle of the bevel front plane.
The angle of inclination of the saw is set using the same pendulum protractor. First, a positive angle is set (in this case, 8 °).
After that, sharpening every second tooth.
After sharpening half the teeth, the angle of the saw blade changes from 8 ° to 8 °.
And every second tooth is sharpened again.
Rear Sharpening. To sharpen a tooth on the back plane, it is necessary that the machine for sharpening saw blades allows you to set the saw in such a way that the back plane of the tooth will be in the same plane with the working surface of the abrasive wheel.
If there is no sharpening machine saw blades
Accurately maintain the necessary sharpening angles while holding the saw in your hands while weighing. the task is impossible even for a person with a unique eye and enviable hardness of hands. The most reasonable in this case. to make the simplest sharpening device, which makes it possible to fix the saw in a certain position in relation to the circle.
The simplest of such devices for sharpening circular saws is a stand, the surface of which is flush with the axis of the grinding wheel. Putting a saw blade on it, you can ensure the perpendicularity of the front and rear planes of the tooth with respect to the saw blade. And if the upper surface of the stand is movable. securing one side pivotally and the other. resting on a pair of bolts that can be screwed in and out. then it can be installed at any angle, getting the opportunity to sharpen an oblique tooth along the front and rear planes.
True, in this case one of the main problems remains unresolved. Exposure of the same front and rear sharpening angles. This problem can be solved by fixing the center of the saw relative to the abrasive wheel in the desired position. One way to implement this. make a groove for the mandrel on which the saw is mounted on the surface of the stand. Moving the mandrel with a circle in the groove, it will be possible to withstand the necessary front angle of sharpening the tooth. But for sharpening circular saws with different diameters or sharpening angles, it should be possible to either move the engine or the stand and the groove with it. Another way to provide the required sharpening angle is simpler, and is to install on the table the stops fixing the disk in the desired position. At the end of the article there is a video demonstrating such a device.
Sharpening quality control
GOST 9769-79 sets certain tolerance values for sharpening parameters. The end runout of the tooth tips should not exceed 0.2 mm (for saws with a diameter of up to four hundred mm), radial. 0.15 mm. The runout is checked using a conventional dial gauge.
Deviations of sharpening angles should not exceed:
- for the front corner. ± 1 ° 30 ′;
- for a back corner and bevel angles of a front and back planes. ± 2 °;
the value of the angles and shape of the teeth
Any construction cannot do without a circular saw. When performing various operations, it is necessary to make cuts and cuts. With the help of circulars, it becomes possible to cut any tree with high speed and high quality. With the constant use of such a device, the cutting tool becomes dull, and the productivity of the operation decreases. Sharpening circular saws becomes a critical operation.
Classification of Circular Saws
To obtain a clean cut, it is necessary that the grinding of the circular saw blades is done correctly. Tools are divided into several groups:
- The working area of the disk is hard sprayed.
- Carbide inserts are soldered to the saw teeth.
Saw teeth must be bred after sharpening. If you perform work with a dull tool, the drive begins to experience additional load, the cut quality suffers.
If the disk works with hardwood, 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, cut quality will suffer.
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Varieties of cutting surfaces
To increase work efficiency, engineers have developed several types of teeth that differ in their shape and angle of sharpening:
- Straight. It is used for fast cutting with low quality. It can not be used for hardwood cutting and particularly delicate operations.
- Beveled shape. It is easy to cut composite materials with these teeth. Sawing of double-sided laminated chipboard is performed without chips. Hard workpieces are easily cut with teeth, in which the back surface has a beveled appearance. However, they are dulling too fast. To prevent this, the inclination of the teeth alternates.
- Trapezoidal. The main advantage of this method is slow dulling. It works in conjunction with straight teeth. The trapezoid is located above the main element. It does the “rough” job, making it easier to straighten.
- Conical. Canvases having such a tooth shape are considered auxiliary. They are designed to obtain preliminary incisions, 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 performs cross cuts.
Correct sharpening angle
Circular saws have teeth with two angles:
The angle depends on the type of material being processed, the purpose of the working equipment and the direction of sawing. For example, to obtain a longitudinal cut, the front angles are made within 15-25 degrees. For a transverse cut, the rake angle will be in the range of 5-10 degrees. An angle of 15 degrees is suitable for processing any material in the right direction. The angle depends on the hardness of the workpiece. Harder material, the sharper the teeth need to be sharpened.
Disc Blade Processing Methods
To form a cutting edge, any grinding machine is suitable where the design of the equipment is not is of great importance. Of course, the sharpening angles of carbide-tipped disk plates are more accurately obtained using specialized equipment. However, its cost is very high, so they use a conventional grinding machine, which has the ability to change the slope of the corundum disk.
In order to sharpen a circular disk yourself, it is necessary to strictly fulfill several basic conditions:
- Typically, the top edge undergoes deformation. Sometimes rounding of the faces reaches 0.3 mm. Therefore, sharpening starts from the top.
- Processing is carried out taking into account the leading edge and its back.
- The operation is repeated at least 25 times. The thickness of the removed metal should not be more than 0.05-0.15 mm.
- The quality of processing should be exactly the same on the entire surface to be treated.
- After sharpening, it can be fine-tuned manually with sandpaper with fine grain.
Carbide tipped sharpening
Sharpening circular saws with victorious brazing often causes problems. Processing with standard abrasives takes a very long time, and if the material is overheated, it can be “tempered". Of course, processing with a diamond tool will be much faster, but its cost is very high. The acquisition of the winning disc will be much more economical.
Each master approaches the solution of this problem purely individually. To get the correct sharpening angles for carbide-tipped saw blades, you definitely need a machine.
Home gear processing
To process a circular saw, it is not necessary to have a special machine for sharpening circular saws with your own hands. To fix the canvas in a certain position, you can use a flat stand, which has several nuances:
- The surface should be flush with the center of the grinding wheel.
- The sharpening plane must be at an angle of 90 degrees relative to the gear circle.
- To create a different inclination, the device must have a swivel joint.
To select the desired angle, the mark is made with a colored marker. The device must be installed in a powerful vice. Not even the slightest movement of a special stand is allowed.