Sharpening Circular Saw Blade With Soldered

Ways to sharpen circular saws

Sharpening Circular Saw Blade With Soldered

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

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

In no case should you do the sharpening by hand yourself. First, it will take a very long time. Secondly, the result obtained will not meet the standards. If it is not possible to sharpen the saw blade on wood yourself, it is recommended to use the services of specialized companies.

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

  • The main deformation occurs at the upper edge of the tooth. The edges are rounded from 0.1 to 0.3 mm. It is from this place that you need to start processing;
  • Sharpening is carried out along the leading and trailing edges. This will provide the ability to repeat the procedure up to 25 times;
  • Removal rate should not exceed 0.05-0.15 mm;
  • The level of machining of the front and back edges must be the same.

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

The need to sharpen the saw

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

The advantage of using a brazed saw blade is a longer service life. It is also designed for hardwood processing. Surfacing is made of steel 9KhF, 50KhVA, 65G and similar compositions. They are distinguished by high hardness, but at the same time, with significant operation, the likelihood of their breakage will increase.

Timely sharpening of circular saws with a do-it-yourself machine is performed with the following obvious signs:

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

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

Carbide-tipped circular saw blades can lose their original qualities during prolonged use. But this does not mean that you should purchase a new cutting tool. In most cases, sharpening can be done at home using any suitable machine.

How to determine the sharpening angle of a circular saw

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

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

DIY template making technology.

  1. Take a new disc with solders, which is completely identical to the blunt one.
  2. Draw precise outlines on a hard piece of cardboard.
  3. Using a pendulum goniometer, determine the initial geometry of the carbide beads.
  4. Enter data on the template.

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

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

Ways to Extend Saw Blade Life

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

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First of all, you should read the manufacturer’s recommendations. They indicate the number of revolutions (maximum and minimum) for different 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. The alternative soft is practically not subject to such defects. But her service time is less than that of a solid.

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

The material shows an example of a hand-made disc sharpening machine:

Drawings and tooth geometry

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

How to determine the sharpening angle of a circular saw

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

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

DIY template making technology.

  1. Take a new disc with solders, which is completely identical to the blunt one.
  2. Draw precise outlines on a hard piece of cardboard.
  3. Using a pendulum goniometer, determine the initial geometry of the carbide beads.
  4. Enter data on the template.

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

Additionally, it is recommended to compare the obtained data with the reference data. In longitudinal cut saws, the rake angle is typically 15 °.25 °. For transverse models, this figure ranges from 5 ° to 10 °. On the universal models, the rake angle is 15 °.

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

The materials used and the sharpening process of the circular saw blade

When working with a circular saw, most often the main edge becomes dull. In the process of cutting, the main emphasis is on it, so it is necessary to ensure that it does not round off by more than 0.3 mm, since difficulties may arise during the subsequent sharpening of the cutters, not to mention a decrease in productivity.

Auxiliary planes are also subject to wear (albeit to a lesser extent), especially when working with massive products.

To sharpen the teeth of circular saws with victorious teeth, high-strength materials are used. Diamond wheels, silicon carbide (green) wheels, etc.

Important! Before starting the process, you must make sure that the device is clean, that is, make sure that there is no dirt or water on the surfaces to be treated. And it will also be useful to treat the diamond wheel with a cutting fluid, since there is a high probability of rust formation when cooled with plain water.

When choosing an abrasive wheel, you should pay attention to the fact that its surface is slightly grainy, because this is how the desired surface cleanliness of the sharpened tooth is achieved. Otherwise, when working on the material, chips, notches and other defects will remain.

To process victorious soldering, the speed of rotation of the sharpening wheel must be at least 15 m / s, that is, with a diameter of 120 to 125 mm, the speed of rotation must be at least 1500 rpm.

There are special devices for sharpening soldering. Grinding machines, the advantage of which is:

  • Variability of movement of both the machine tool and the abrasive wheel;
  • Ensuring an even sharpening angle.

Further actions are performed manually. Turning the saw in a circle (per tooth), subsequent grinding, checking the volume of metal removed. Such mechanisms are great for handling soldering at home.

Determination of the degree of wear and the angle of sharpening

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 properly sharpened again. This operation is simple, in many cases you can do the work yourself.

First of all, you should have an idea: what parameters the working disk of the unit has. The second most important parameter is the sharpening angle, what parameters does the tooth itself have.

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

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Discs that are processed with special materials require a special approach. The brazed disc can significantly increase the service life of the cutting tool. It can work with all types of trees, even materials with increased hardness.

The knobs themselves are made of ultra-strong steel of the brand:

And also some other steel grades are used.

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

It is advisable to get started with the right template by which you can correct the geometry of the cutting surface. Usually the template is made of tin or cardboard.

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

In the absence of a template, it will be necessary to determine the parameters of the teeth yourself. For this there is a tool. A pendulum goniometer. With this tool, you can precisely align the sharpening angle.

Another option is take a new disk and use it as a template. You should take a sheet of thick cardboard, draw precise outlines on it with a pencil. Then, using a pendulum angle meter, the exact configuration of the soldering should be established. This the sample is recommended to be saved, it will be possible to work with it in the future, using as a reference.

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

If the model is transverse, then the differentiation can be from 5 to 10 degrees. If the model is universal, then the tilt angle is only 15 degrees.

Consider when starting work: the rake angle can be negative. Similar models are used for working with PVC sheets, as well as with soft metals.

You can sharpen the tool with your own hands (if it does not have a winning coating) at home on your own. And also in such cases, you can use a simple machine on which you can successfully sharpen any edges. It is very important to choose the right circle.

The need to sharpen the saw

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

The advantage of using a brazed saw blade is a longer service life. It is also designed for hardwood processing. Surfacing is made of steel 9KhF, 50KhVA, 65G and similar compositions. They are distinguished by high hardness, but at the same time, with significant operation, the likelihood of their breakage will increase.

Timely sharpening of circular saws with a do-it-yourself machine is performed with the following obvious signs:

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

The best way is to periodically check the status of the tree-soldered disk. This will require temporarily leaving the machine and dismantling the cutting tool. If its geometric parameters do not coincide with the original ones, sharpening is required.

From a soldered circular saw. Sharpening circular saw blades

Sharpening angles of teeth

The sharpening angles are determined by the purpose of the saw. I.E. The cutting of which material and in which direction it is intended. Rip saws have a relatively large rake angle (15 °.25 °). For cross-cut saws, the γ angle usually ranges from 5-10 °. Universal saws designed for cross and rip sawing have an average rake angle. Typically 15 °.

The sharpening angles are determined not only by the direction of the cut, but also by the hardness of the material being cut. The higher the hardness, the smaller the front and back angles should be (less sharpening of the tooth).

The rake angle can be not only positive but also negative. Saws with this angle are used for cutting non-ferrous metals and plastics.

Manual way

It is possible to independently sharpen the teeth by hand using a file, so that it is of high quality, if they do not have a bevel, that is, the surface of the front face is perpendicular to the surface of the blade. The process looks like this:

  1. A block is prepared from dense wood with a cross section of somewhere 50×50 mm and a length of 100 mm. The sides of the bar should be located strictly perpendicular to each other.
  2. Mark with a marker any tooth that will be reportable and the first to be processed.
  3. The saw blade is clamped in a vice together with the bar so that the front edge of the workpiece is flush and in the same plane with the surface of the bar (in this case, the bar acts as a file guide).
  4. A thin file (its thickness should allow it to fit freely into the cavity between adjacent teeth) is applied to the surface of the tooth to be treated and at the same time sharpening is carried out to the bar and methodical movements back and forth.
  5. So each tooth is gradually sharpened, monitoring the state of the bar and, when working out its surface, slightly shifting the plane.
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Do it yourself sharpening at home

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

Types of circular saw teeth setting

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

There are three main wiring methods:

  1. Stripping type wiring. This method boils down to the fact that the tooth after two remains in its place without change, the rest are rejected in different directions. This saw preparation is good for working with solid wood.
  2. A variant of the classic setting, when the saw teeth alternately move to the right and then to the left. This versatile method can be used for almost all types of saws.
  3. The so-called wavy layout, a distinctive feature of which is the retraction of the teeth not at a strictly defined distance from the center, but at different distances with a deviation of 0.3-0.7 millimeters.

General rules for sharpening a circular saw

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

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

How can you sharpen a circular saw

  1. Special wheels for sharpening saws, made on the basis of diamond abrasives.
  2. A regular file for sharpening a saw, but you also need to have a vise to secure the saw and a block of wood to use as a guide.
  3. Processing on professional equipment is the fastest and highest quality way of sharpening, but it requires large material costs for purchasing a tool.

The main sharpening angles of circular saws

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

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

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

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