Setting And Sharpening Band Saws

Sharpening and setting the saw

The main cutting element of any hand saw. A series of teeth that are cut into the blade and are wedge cutters. Wood, in the manufacture of all kinds of products from it, is sawn along, across and at an angle ее to its fibers, in this regard, transverse, longitudinal sawing and sawing at an angle to its fibers are distinguished and in each case use the appropriate type of saw, which differs from others in shape teeth.

When crosscutting, cross 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 sawing in that the direction of movement of the saw is parallel to the grain of the wood. The leading edges of the rip saws cut the wood like knives in a plane, and, going deeper, form a cut. When sawing wood at an angle Θ, universal (mixed) saws are used to its fibers with teeth that are an intermediate form of teeth for cross and longitudinal saws.

Saw sharpening

Saw teeth sharpening. It is a kind of art that requires loyalty of hands, a good eye, and attention. It is not difficult to learn this business, you must have the desire and clearly adhere to the following rules:

  • The saw blade must be firmly fixed in a special device made of wood, which is also firmly set on a well-lit work table. Sharpening saw teeth on stools or knees does not give a satisfactory result.
  • You should use a personal file, followed by cleaning the sharpened edges of the teeth with a velvet (with a fine notch) or file. It is desirable that the file is new, sharp and with a fitted handle. If at the right time there was not one, then you can also use a second-hand one, but always brushed with a steel brush and rubbed with charcoal so that the file does not get clogged or dull. When sharpening a tooth, the file should grip its metal and remove its layer depending on the pressure. And if it slides over 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 he slips over the tooth, then 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 directed to the saw teeth. Working with a file, depending on the type of saw, is described below.
  • The pressure of the file on the teeth should be smooth and even and only to one side. When returning the file to its original position, it must not touch the teeth.
  • It is necessary to try to grind the 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 keep the angles, pitch and height of the teeth after sharpening.
  • Burrs are formed on the edges of the tooth from the side of the file exit, which reduce the sharpness of the tooth, and if they are not removed, then during the operation of the saw they chip out, and the teeth become significantly dull. To remove burrs, the edges of the teeth are sharpened with a file with a velvet notch and deburred from the side edges with a wet donkey.
  • After sharpening the teeth, check their sharpness. Look at the tip of the needle and the edge of the razor blade: they are sharp and do not shine in the light. And if they are blunt, then rounded surfaces appear at the tip of the needle and on the edge of the blade, which reflect light and shine well. The quality control of saw teeth sharpening is based on this principle. To do this, place the saw in front of your eyes and examine its teeth along the blade. If their cutting edges and tops are not shiny, then the saw teeth are sharpened satisfactorily, and if some of the teeth are shiny (often this is), then they must be sharpened with a velvet file, deburred and re-check the light reflection from their edges and tops.

Cross saws. The teeth of the cross-cut saws are sharpened using a triangular file with a fine notch with a 60 ° point angle.

To sharpen the teeth, the saw is clamped into a special device that allows its blade to be set at an angle of 45-50 ° to the plane of the desktop. The file is led parallel to the working table at an angle of 60-75 ° to the saw blade and thus the left edge A1A2B2B1 is sharpened in the first tooth.

Saw teeth are sharpened in several stages. First, with a file, they pass along the left edges of the odd teeth located in the far row, adjusting the hands to the same movement. Then they pass the file along the right edges of the same odd teeth, completing the sharpening of the main cutting edges with very sharp tips. After finishing the sharpening of the odd teeth, the saw blade in the sharpening device is turned over and thus the even teeth that are in the far row are sharpened. When sharpening the teeth of crosscut saws, care must be taken to ensure that sharp main cutting edges with a dihedral angle φ = 60-75 °, a short cutting edge and a sharp point are obtained in each tooth.

Longitudinal saws. Rip saw teeth in which the angle π

Wood band saw and sharpening

Band saws are used as cutting tools in band saws. They are a metal strip with applied teeth. They have a lot of advantages.

When compared with circular tools, the cutting width of a band saw is much smaller, which, in turn, has a positive effect on sawing expensive wood species or cutting elite grade metal.

The band saw has a good cutting speed while still providing excellent cut quality. With its help, you can cut absolutely any workpiece.

In order for the saw to have the above characteristics, it is necessary to set and sharpen it in a timely manner and with high quality.

In branded centers, the cost of sharpening saws is low, but the quality of work is not always pleasing. Therefore, we will try to help you in this matter if you decide on your own to sharpen and set the band saw.

Saw band composition

Saws for cutting wood are punched from tool steel, which has a hardness of 45 HRC.

For cutting metal, domestic manufacturers use steel grades 9HF, B2F, foreign ones use. C 75 and others. Saw teeth using the steel described above acquire the highest hardness due to hardening by high-frequency currents. Quite often, when working with metal, a bimetallic tape tool is used.

The bimetallic blade is made of so-called spring steel, and the toothed belt itself is made of a metal alloy with high impurities of cobalt and tungsten. This high speed alloy is bonded to the blade base using an electron beam.

Teeth and their sharpening angles

Band saws have different tooth geometries and are influenced by the properties and type of material being cut. So, to work with wood, a joiner’s saw is used, for cutting logs, a dividing saw. Each type, respectively, has its own tooth geometry.

For band saws designed for working with wood, the sharpening angle is determined by the manufacturer, but the following is characteristic. the harder the material, the smaller the rake angle.

For saws with a constant tooth pitch, when working with metal, two tooth shapes are characteristic. “positive rake angle” and standard. Standard teeth are used for cutting thin walled materials, while positive rake teeth are used for cutting thick walled metal.

For workpieces with a small thick wall (pipes, sheet metal), saws with a small tooth pitch are used. otherwise there is a risk of breaking or damaging the tooth. Thick-walled workpieces are best handled with fewer tpi tools.

To remove the effect of vibrations, a number of saws are made with a variable tooth pitch.

Professional advice

  • When sharpening a tool on a machine, before starting sharpening, you need to make sure that the sharpening disk is correctly positioned relative to the saw.
  • It is necessary to remove such a layer of metal from the sinuses in order to guarantee the elimination of all microcracks.
  • If the saw was operated without high-quality maintenance, longer than specified by the manufacturer, the layer of metal removed in one sharpening must be increased.
  • Always use a new tool as a reference to check the sharpening results.
  • The shape of the saw blade is a parameter verified and developed over the years. Therefore, it is not worth displaying your parameters and hoping for a good quality of work.
  • Subject to the rules of operation and the requirements of the manufacturer, the band saw will serve you until its width is reduced to 65 percent of the original crimp. Width decreases during tooth regrinding.
  • It is imperative to remove burrs when sharpening the tool, otherwise it will lead to the formation of microcracks during the cutting of materials.
  • After finishing work, the tool must be immediately cleaned of sawdust and resin, and before sharpening, the saw must be carefully inspected. Otherwise, chips will clog the sharpening wheel, resulting in improper sharpening of the saw band.

Sharpening types

  • Full profile view. It is the highest quality type, produced automatically on specials. Machine. A precisely matched elbor disc passes the entire interdental cavity together with the edges of adjacent teeth in one motion. This excludes the formation of angular shapes at the base of the teeth. The only drawback of this type of sharpening is the need to carry a certain number of different circles for saws with different profiles.
  • Sharpening the edges of the cutting part. It can be made manually or on a professional machine. If you want to sharpen with a machine, you need to choose the right circle. in most cases these are flat samples. Based on practice, contact the specialist. Sharpening equipment is necessary only in cases where the volume of work is very large. With a small amount of work, it is better to sharpen manually. on a conventional machine or using an engraver. When performing sharpening work, for safety reasons, you must use protective glasses or a mask.
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If you do not have an engraver or a machine tool, then you can sharpen the tool in the old-fashioned usual method. using a file. With diligent and regular execution of the operation, the skill of manual high-quality sharpening will very quickly appear.

Correct tool sharpening process

It has been proven in practice that over 80 percent of tool breakages occur due to improper sharpening of band saw teeth. The need for sharpening is determined by eye. according to the condition of the cut walls or the type of teeth themselves.

Sharpening wheels for band saws are selected according to the hardness of the tooth. A corundum wheel is used to sharpen tool steel tools. Bimetallic saws are sharpened with diamond or borazon abrasive. The shape of the circle for the tool should be determined based on the parameters of the saws. It can be cup, profile, plate and flat.

Before using the saw in work, it is necessary to hold it in a suspended, inverted state for about eleven hours.

Requirements for sharpening a tool with your own hands:

  • It is necessary to evenly remove the metal along the tooth profile;
  • Exclude excessive pressing of the circle (this can lead to damage to the tooth);
  • Mandatory use of coolant;
  • Ensure the integrity of the tooth geometry;
  • Avoiding burr formation.

The standard instruction states that the sharpening of the tool should be carried out either along the front face of the tooth, or along the back and front. In practice, many craftsmen, and even professionals, sharpen exclusively along the back edge. so, in their opinion, it is more convenient.

This tool is quite unpretentious in terms of sharpening, despite a lot of requirements and rules. Sharpening can be done both manually and using a special sharpening device; apply for processing circles of different material and shape, etc.

Before sharpening a tool, you need to familiarize yourself with the basic types of this operation. Also on the Internet you can view.

Band saw teeth setting

When working with a tool, the quality of the cutting edge of the teeth inevitably decreases. Therefore, the correct sharpening and setting of the band saws is an integral part of the cutting workflow.

Remember, divorce should be done before sharpening, not after.

Set is the process of bending the teeth to the sides to reduce friction and pinch the blade. There are three types of wiring:

  • Cleansing. it is necessary to leave every third tooth in its original form. It is used in tools for cutting especially hard alloys and materials;
  • Classic. the teeth must be bent left and right strictly alternately;
  • Wavy. each tooth is bent a certain amount, resulting in a wave. This is the most difficult wiring type.

It must be remembered that when divorcing, two-thirds or a third of the top of the tooth is bent, and not the entire tooth.

The recommended values ​​for divorce rates by manufacturers are approximately 0.3 to 0.7 millimeters. Wiring is carried out using adjustable special tools.

Errors in the sharpening process

Mistake # 1. Burnt grooves of saw teeth.

The reason lies in the excessive pressure of the sharpening wheel on the saw. The result will be a quick blunt tool.

Error 2. Imperfection of the geometry of the sinuses of the teeth and the wrong angle of inclination.

A number of conditions can lead to this error:

  • Wear of the eccentric of the sharpening device;
  • Error during slope angle calibration;
  • Incorrect grinding wheel profile.

Now you know how to sharpen a band saw correctly, and what accessories and tools you may need to do this. Also you can additionally find this process on the Internet.

Wiring

Setting band saws into wood is the first step in restoring the profile of the cutting edge. During operation, the location of the teeth can change, so until the correct geometry is achieved, it makes no sense to sharpen the saw part.

There are 3 ways to open the saw:

  • Classic. the teeth alternately deviate to the right and left;
  • Stripper. the 1st and 2nd teeth deviate in different directions, the third remains even. This profile is created for sawing hard materials;
  • Wavy. the most difficult option, resembling a wave in shape. Here, each tooth is individually shaped, and this type of setting is usually only done in specialized workshops.

It should be noted that when wiring, not the entire tooth is bent around, but approximately 2/3 of the upper part. The procedure is performed on a special machine for setting band saws. The cost of such a tool is quite high, so they buy it if you need to adjust several tools. Its presence can become the basis of a sharpening business.

Of course, the first time you can do everything correctly, even on an adjustable machine, it may not work, so at least the geometry of the profile should remain the same as before starting work.

Setting And Sharpening Band Saws

What you need to know about sharpening angles

The geometry of the teeth of band saws can be modified depending on the characteristics of the material being processed. This is expressed in the shape of the tooth and the distance between the individual elements of the cutting edge.

The saw band profile is determined by the markings applied by the manufacturer. It looks like this:

  • WM. a universal version designed for sawing soft and hard wood;
  • AV. used for longitudinal cutting and sawing of hard materials, such as frozen wood;
  • NV. has a narrow blade width, so it is ideal for shape cutting;
  • NU. a cutting edge with a wide tooth pitch, which provides high performance when cutting soft wood;
  • PV. almost a complete analogue of the previous blade, but has a flattened tooth shape;
  • KV. the profile is used for wide band saws intended for soft wood;
  • PU. wide saw blade for sawing hardwood.

The tooth pitch is selected individually, depending on the material. For example, when sawing hardwood and metal, only fine-toothed blades are used to avoid damaging the cutting edge. Soft raw materials and thick-walled materials are processed with saws with a large tooth spacing, which allows to speed up the production process.

Characteristics

There are three distinctive features of band saws. They are made only of special grades of tool steel, which ensures high strength and wear resistance of the teeth. Russian manufacturers usually use steel grades 9XF and B2F, foreign companies prefer the C75 series. In any case, the hardness of the material must be at least 45 HRS.

The cutting width of the band saw blade is much narrower than that of circular counterparts. As mentioned above, this is a fundamental factor when processing precious woods and industrial wood.

The saws are able to handle workpieces of any length and diameter without any problems. At the same time, a properly sharpened band saw ensures high production productivity.

It should be clarified that the reliability of closed saws is due to the heterogeneity of the material used to make the blade.

In particular, the body of the saw tool is usually made of spring steel, which has incredible tensile and dynamic resistance. Grades of steel with high tungsten and cobalt are used for the manufacture of cutting edges. Separate parts of the web are welded together by high-frequency currents. Tools made using this technology can be used for cutting metal.

How to sharpen a band saw correctly

Immediately, we note that if there is no experience and skills for performing such work, it is better to entrust saw sharpening to professionals. Violation of the geometry of the teeth of the cutting edge, the appearance of dross on the metal or improper setting will significantly reduce the life of the blade.

Having decided to sharpen the band saw with your own hands, it will be useful to first familiarize yourself with the key definitions, the knowledge of which may be required in the process. So, for the correct formation of the cutting edge you will need:

  • Setting. deviation of the teeth from the plane of the main saw blade;
  • The height of the teeth is the distance between the top point and the base;
  • Pitch. the distance between the teeth, usually varies between 19-25 mm.
  • Grinding angle. depends on the purpose of the tool; for example, the recommended sharpening angle of carpentry saws is 35 °, indexing. 18-22, intended for sawing a bar. no more than 15 °.

The sharpening angle is determined by the manufacturer, therefore, when self-dressing the saw, it is recommended to adhere to these parameters.

Here are detailed instructions that will help you sharpen a closed saw correctly without resorting to the services of specialists.

Rules for sharpening band saws for wood

Band saw. closed-type cutting tool used on sawmill equipment.

The undoubted advantages of these elements are high productivity and a minimum amount of production waste. It is possible that when sawing ordinary boards, the latter fact does not play a significant role, but when it comes to processing valuable wood, the kerf width and cut quality directly affect the economic benefits.

Correct sharpening of a band saw for wood is a guarantee of production efficiency and tool durability. Usually, such services are provided by specialized companies, but if you know the procedure and the subtleties of the procedure, you can sharpen a dull saw yourself.

Sharpening

This is the main step in cutting edge dressing and can be done in two ways.

Full-profile saws are sharpened with an CBN wheel installed in a special sharpening machine.

This is a fully automated operation used by professionals. The work of the machine for sharpening band saws for wood is controlled by electronics, and the sharpening wheel processes the entire band in one pass. The disadvantage of this method is that the CBN wheel is selected individually to the profile of the saw, therefore, to edit different tools, the sharpening element must be present in the assortment.

Sharpening of teeth is performed manually or on specialized equipment.

In the first case, the sharpness of the teeth can be restored in the shortest possible time, but the work requires certain skills. In the second, painstaking work: 4-5 movements along the edge of each tooth.

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Diamond, CBN and corundum wheels are used for automatic sharpening. It is important to understand that when performing this procedure, only sharpness is given to the teeth, the geometry created after setting the blade should remain unchanged.

Common mistakes

If a person tries to sharpen a saw for the first time, it is difficult for him to fulfill all the requirements and remember the nuances of the technological process. However, violation of these rules leads to the fact that the efficiency of using the band saw is significantly reduced, the load on the blade increases, which leads to premature rupture.

Professionals recommend avoiding such mistakes:

  • For mechanical sharpening, the abrasive stone is not positioned correctly in relation to the saw profile. In this case, the sharpening of the teeth will be uneven;
  • Excessive force due to contact between the saw and the grinding wheel. As a result, the metal overheats, dross appears, which leads to premature wear of the cutting edge;
  • Burrs remain on the canvas. After sharpening, all roughness must be eliminated, otherwise microscopic cracks will appear on the metal during operation;
  • Apply your own sharpening angles. Many inexperienced craftsmen believe that only sharpness is important for the saw teeth, therefore they shamelessly violate the geometry of the cutting edge profile recommended by the manufacturer. It is important to understand that the shape of the tooth has been tested over the years; trying to experiment here is useless.

Instead of a conclusion, we add that each band saw has a certain resource, so the blade cannot be sharpened indefinitely. Manufacturers guarantee correct tool operation until the total blade width is reduced to 65% of the original size.

Setting and sharpening the band saw is half the battle!

The most important factor in the success of a sawmill business is which saws are used in production. The size of the saw is important, and the material from which it is made, and the technology by which it is produced.

But even using the best-sized saws manufactured to the latest standards will not allow you to get the profit you expect if these saws are not sharpened and set correctly. Incorrect setting and sharpening of the saw lead to the appearance of defects on the lumber, which means that its cost drops significantly.

Correct sharpening and setting of saws is especially important when working on a band sawmill. Unfortunately, in practice, many even confuse the sequence of these procedures: first they spread the saw, then sharpen it. As a result, the spread of the saw tooth “goes away”, and the saw must be diluted again, or, if this is not done, the quality of the finished product will leave much to be desired.

If we talk about machines that sharpen and set saws, then every detail is really important here. The Emerald Les company has contributed to the development of high-quality adjustable and sharpening devices.

The adjustable saw has the correct geometry: when the saw is installed in the adjustable saw, the root of the tooth is between the cheeks that grip the saw. In many other machines, including those from a number of well-known manufacturers, this condition is not met. Therefore, when bending a tooth, both the tooth and the saw body deviate. Technically correct setting of the saw implies something else: the pusher rests against 1/3 of the tooth and bends only its tip.
In the manufacture of the adjustable machine, two clamping stops are used, which, with light pressure on the handle, press the tooth against the indicator head. The pusher, before reaching the tip of the tooth, shows the actual set on the band saw. If it is insufficient, the operator presses the tooth until it is diluted to the required size. We consider it very important to pay attention to one point: a band saw tooth has such a property as metal memory. Because of it, under the influence of inertia, the tooth tends to return to its original position. Therefore, for correct wiring, it is not enough to make one click on each tooth: it is necessary to act on the tooth several times so that it remembers its position. If someone tells you that it is enough to click on each tooth once, know: you are being misled.

Two clamping stops with powerful springs used in the machine show the actual saw tooth spread, which is very convenient: you do not need to endlessly unscrew and reconnect the pusher to find out how the saw tooth was actually retracted.

Another strong point of the adjustable machine made by the company is the ease and safety of the operator’s work: the spreading of the tooth occurs not due to the operator pressing the pusher forward, as in a number of analogues, but due to the operator’s own weight and using the eccentric. As a result, the operator does not have hand sprains.
So, high-quality adjustable and sharpening machines are what, undoubtedly, should be in the arsenal of every sawmill owner. But by themselves they do not guarantee the quality of lumber, they will not allow the saw to serve for a long time if sawmills that have serious technical flaws are used in production.
For example, if the rollers are made in a cone, or they have become conical because the saw has sharpened them, then even with proper sharpening and setting, the saw begins to look for its place in the log. This will happen because the rollers are tilted. If the pulleys on the sawmill are divorced and not in the same plane, then the saw is flared not clearly in the middle, but from the sides, and then the stress goes to the edge of the band. It also reduces saw blade life.

So the role of correct setting and sharpening of the saw is, of course, great, but these factors do not determine 90% of high-quality sawing, as is commonly believed. It’s just that the saw itself will not be able to cut perfectly evenly and not fail for a long time, if, for example, a rigid tension is used on the sawmill.

If you are just starting your business and have not yet had time to get acquainted with all these nuances, we recommend that you contact those who have been in the market for several years. The telephone number of the central office of the Emerald Forest company in Novosibirsk: 8 (383) 249-43-21. Contact us. and we will advise you on the choice of equipment based on your needs and your budget.

Do-it-yourself divorce and sharpening of band saws on wood

The service life of a band saw for wood directly depends on the quality of its sharpening. It can be performed both independently and by resorting to the services of specialized companies. In the first case, you need to familiarize yourself in detail with the technology and a number of features.

Cutting shape and sharpening angle

The first step is to determine the type of saw band. The main indicator is the shape of the teeth. Depending on this parameter, they are divided into dividing, joiner’s or intended for sawing logs. The manufacturer defines the initial geometry and routing angle. It is recommended to find out these data at the stage of purchasing components. They are needed to determine the parameters of the machine.

For hardwoods, the rake angle should be as low as possible. This ensures optimal contact of the processed material with the metal. If you plan to process soft varieties. to increase the processing speed, you can use models with a large value of the rake angle.

The defining parameters for self-updating of the cutting edge are:

  • Tooth pitch. This is the distance between the cutting elements of the structure. Common values ​​are 19, 22 and 25 mm;
  • Tooth height. The magnitude from its base to the top;
  • Angle. The main value that you need to know to form the cutting plane. For joinery models it is 35 °. In dividing saws, the angle is 18 ° to 22 °. In structures for processing timber. 10 °.15 °;
  • Divorce. Defines the deviation of the tooth from the general plane of the blade.

In order to eliminate resonance in some types of cutting tools, a variable pitch of the teeth is made. This does not affect manual sharpening, but requires careful setting of parameters during automated.

Saw band design

The band saw belongs to the category of cutting tools and is an integral part of specialized equipment for wood processing. It is a closed belt with teeth on the outer edge.

For manufacturing, special grades of steel are used. 9HF, B2F or C75. During the production process, the teeth are treated with high-frequency currents. This increases their hardness. It is this fact that affects the spreading of cutting edges and maintainability. Often, several types of steel are used in the manufacture. The main belt is made of spring and the cutting part is made of steel with a large m of tungsten or cobalt.

Features of the use of band saws for wood:

  • Wood requirements. The harder it is, the faster the blade will dull;
  • Installation conditions. The tension indicator must be observed. If it is less than required, sagging will occur. Strong tension will increase the likelihood of blade breakage;
  • Periodic sharpening. This will require a special machine.

The implementation of the last point will increase the service life of the tape structure. However, sharpening yourself is problematic. you need to choose the correct layout, observe the angle of processing of the blades.

Saw band setting

Before forming the cutting edge, make sure the teeth are set correctly. During the entire period of operation, due to constant loads, their location may change. Therefore, the geometry is adjusted first, and then sharpening.

The setting is a bend of the teeth relative to the plane of the main blade. This procedure is performed only on a special machine. In case of large discrepancies along the entire length of the belt, premature damage or breakage of the belt is possible. Therefore, before that, you should decide on the type of wiring.

The angle of inclination must correspond to the initial one. The type of wiring is also taken into account, which can be as follows:

  • Classic. Alternate bending of the teeth relative to the blade to the right and left sides;
  • Cleansing. The first and second teeth are deflected to the right and left, while the third remains unchanged. This technique is used for saws that are designed for working hard rocks;
  • Wavy. The setting angle for each tooth is individual. As a result, they form a cutting edge that resembles a wave. The most difficult type of wiring.
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During the bend, not the entire tooth is subjected to deformation, but only part of it. Often the deviation occurs at 2/3 of the total height.

Sharpening recommendations

Choosing the right type of grinding wheel is important. It must correspond to the grade of steel from which the band saw is made. For tool steel structures, corundum wheels are used. If it is required to improve the cutting properties of bimetallic models, CBN or diamond wheels should be used.

Depending on the technical capabilities, it is possible to perform a full-profile processing or each cutting part separately. In the first case, you will need an elbor circle, the end of which has the same shape as that of the saw. For the second option, each tooth is processed.

You will first need a machine. It must have the function of regulating the speed of rotation of the disk and changing its position relative to the tool. After fixing the blade in a special bed, follow these steps according to the following instructions.

  • Emery goes down. At this time, the leading edge is machined with a cutting edge.
  • Formation of a slice in the depression. This is done without breaking away from the canvas. This stage allows you to remove microcracks and irregularities. An important point is the reduction of surface tension, which is the main cause of deformation of the web.
  • The circle moves up. The back of the tooth and its cutting edge are ground.

All other teeth are renewed using the same technique. It is important that the values ​​of the entry and exit angles are the same everywhere. Otherwise, with differences in geometry in one of the parts, performance will deteriorate.

With prolonged contact of the circle with metal, the temperature on the surface of the latter can sharply increase. To eliminate this effect, use special coolants coming directly from the machine. Feeding is performed continuously to avoid the formation of a glow zone. In this part, the mechanical strength will be deteriorated.

In order to avoid chipping, check the presence of metal components before processing the wood. Also, special attention is paid to fixation and uniform feeding of the workpiece for sawing.

In the material, you can read the recommendations for amateur sharpening:

Why bred a saw

Setting is a process that causes the teeth of the band saw to bend in different directions. Even teeth are bent to one side, odd teeth to the other.

Before spreading a band saw, you need to understand what it is for. Senseless processes usually do not bring good results. It is known that during sawing, the cutting width must be twice the thickness of the saw blade. If the cut is narrower, the saw will get stuck in it. If the wiring is incorrect, the curvature of the canvas is possible. As a result, the saw will go crooked, and an even cut will not work.

Wiring methods

Saw setting methods One of the easiest ways to set saw teeth is with pliers. You just need to take each clove and bend it alternately in different directions.

The tooth must be clamped two-thirds, then the slope will be correct.

As a result of this work, half of the teeth will be bent to the right and half to the left. Another wiring method is carried out using a special tool.

Sharpening

Saw sharpening After breeding, the saw must be sharpened. This is done using a special set of simple tools. You can simply sharpen the band saw using a conventional triangular file. During sharpening, moving the file away from you, it is pressed against the teeth. Moving in the opposite direction, it must be slightly deflected.

If a circular saw can only be sharpened with a whole set of tools, a band saw can be brought into working condition with only one simple triangular file.

The band saw teeth must be sharpened from two points.

In the working process, you can also sharpen the teeth with a bar. When the saw is constantly sharpened, the wiring gradually disappears, the teeth are aligned. In order to return the instrument to its working shape, dilution is repeated again. Capital wiring and sharpening is not required very often.

Setting and sharpening the band saw is half the battle!

The most important factor in the success of a sawmill business is which saws are used in production. The size of the saw is important, and the material from which it is made, and the technology by which it is produced.

But even using the best-sized saws manufactured to the latest standards will not allow you to get the profit you expect if these saws are not sharpened and set correctly. Incorrect setting and sharpening of the saw lead to the appearance of defects on the lumber, which means that its cost drops significantly.

Correct sharpening and setting of saws is especially important when working on a band sawmill. Unfortunately, in practice, many even confuse the sequence of these procedures: first they spread the saw, then sharpen it. As a result, the saw tooth divorce disappears. And the saw needs to be diluted again, or, if this is not done, the quality of the finished product will leave much to be desired.

If we talk about machines that sharpen and set saws, then every detail is really important here. The Emerald Les company contributed to the development of high-quality adjustable and sharpening devices.

The adjustable machine has the correct geometry. When installing the saw in the adjustable saw, the root of the tooth is between the cheeks that grip the saw. In many other machines, including those from a number of well-known manufacturers, this condition is not met. Therefore, when bending a tooth, both the tooth and the saw body deviate. Technically correct setting of the saw implies something else: the pusher rests against 1/3 of the tooth and bends only its tip.
In the manufacture of the adjustable machine, two clamping stops are used, which, with light pressure on the handle, press the tooth against the indicator head. The pusher, before reaching the tip of the tooth, shows the actual set on the band saw. If it is insufficient, the operator presses the tooth until it is diluted to the required size. We consider it very important to pay attention to one point: a band saw tooth has such a property as metal memory. Because of it, under the influence of inertia, the tooth tends to return to its original position. Therefore, for correct wiring, it is not enough to make one click on each tooth: it is necessary to act on the tooth several times so that it remembers its position. If someone tells you that it is enough to click on each tooth once, know: you are being misled.

Two clamping stops with powerful springs used in the machine show the actual saw tooth spread, which is very convenient: you do not need to endlessly unscrew and reconnect the pusher to find out how the saw tooth was actually retracted.

Another strong point of the adjustable machine made by the company is the ease and safety of the operator’s work: the spreading of the tooth occurs not due to the operator pressing the pusher forward, as in a number of analogues, but due to the operator’s own weight and using the eccentric. As a result, the operator does not have hand sprains.
So, high-quality adjustable and sharpening machines are what, undoubtedly, should be in the arsenal of every sawmill owner. But by themselves they do not guarantee the quality of lumber, they will not allow the saw to serve for a long time if sawmills that have serious technical flaws are used in production.
For example, if the rollers are made in a cone, or they have become conical because the saw has sharpened them, then even with proper sharpening and setting, the saw begins to look for its place in the log. This will happen because the rollers are tilted. If the pulleys on the sawmill are divorced and not in the same plane, then the saw is flared not clearly in the middle, but from the sides, and then the stress goes to the edge of the band. It also reduces saw blade life.

So the role of correct setting and sharpening of the saw is, of course, great, but these factors do not determine 90% of high-quality sawing, as is commonly believed. It’s just that the saw itself will not be able to cut perfectly evenly and not fail for a long time, if, for example, a rigid tension is used on the sawmill.

If you are just starting your business and have not yet had time to get acquainted with all these nuances, we recommend that you contact those who have been in the market for several years. The telephone number of the central office of the Emerald Les company in Novosibirsk: 8 (383) 249-43-21. Contact us. and we will advise you on the choice of equipment based on your needs and your budget.

How to sharpen and spread a saw

Band saw blades are often sold unsharpened. A professional tool must first be diluted and then sharpened. The wiring process is repeated every two to three years. An improperly set and poorly sharpened saw can ruin the whole job.

How to sharpen and spread the saw correctly? First you need to understand the essence of these processes. After all, the preparation of a hand tool is different from the preparation of an electric one. Hand saws have a completely different tooth shape and working technique.

Saw care

It is important to be able to not only cut and sharpen a saw. You also need to know how to store it. When not in use, the tool should be placed in a warm and dry place. If the saw gets wet, it will rust.

Even treated with special compounds, the saw will not be able to withstand all aggressive factors.

You need to take good care of the instrument, and then it will serve for a very long time. The saw is usually stored wrapped in material. You can also provide a case for it. Leaving the instrument on the balcony for the winter is not recommended.