How To Threaded Band Saws Correctly
Still, how to breed these band saws?
A band saw is a multi-cutter cutting tool that is used in band saws. It is a closed flexible steel band with teeth on one of the edges. It is installed on two machine pulleys, which are rotated by an electric motor. Straight and curved cuts can be made with the band saw.
Saws can be serrated saws, spark saws and toothless friction saws. All these types are used on band saws. To perform any kind of work, there is a certain set of sawtooth teeth.
Before starting work, if the saw is not sufficiently spread, first of all it must be properly diluted. There is a specialized wiring for this procedure. If at the right time it is not available, as is often the case, then it can be replaced with pliers. The saw must be clamped with the teeth upwards. During all these actions, the operator should observe the entire process taking place along this web. Then each second tooth is bent in different directions. With each movement, the pliers are tilted at an equal angle. Very often, such a layout is initially present to a small extent. You just need to increase it if necessary. This procedure is carried out if you need to process raw wood.
Saw teeth should be set if the tool is large. A small saw that will be used for work where greater accuracy is required, then the factory wiring will be just right.
There are several types of band saw set: standard is left, straight and straight. used for all types of steel. Variable. right, left. reduces vibration and noise.
When working with wood, the correct tooth profile of the band blade is essential. If the teeth are set correctly, then there is 30% air and about 70% sawdust between the surface of the log and the band blade. A large set of teeth can cause a significant amount of sawdust. In addition, a large roughness appears on the finished products. With a small dilution, the required air flow, which is necessary to remove sawdust, stops flowing. This causes the saw band to overheat and then break down quickly.
How can you tell if the set of teeth on a band is insufficient? Hot sawdust will tell you about it. In addition, waves appear on the board if there is not enough divorce. It should be remembered that logs or beams have different diameters. That is why for each of them you need to make a different setting of the saw teeth and sort the timber.
If the wood is hard and damp, this also affects the layout. In order to choose the right setting, a control cut of the log should be done, in which the setting is increased on each side by 0.05 mm until tooth marks appear on the log. As soon as they appear, it means that the air and sawdust are in a ratio of 50 to 50. Then, to get the desired result, you should reduce the wiring by 0.08 mm on both sides.
HOW TO SHARP AND RISE BAND SAWS
HOW TO SHARP AND RISE BAND SAWS
Correct preparation of the band saws for work. this is the key to achieving not only high quality sawing, but also economical use of the tool. A well sharpened and set saw blade stays sharp longer and can be re-sharpened more times. Wood-Mizer advises giving the sharpened saw a “rest” of one day before it is mounted on the sawmill. This relieves stress on the metal and, in general, prolongs the life of the saw.
Sharpening band saws
Wood-Mizer offers several sharpeners of varying and capacities. You can choose the best option for your specific needs. All Wood-Mizer grinders use the CBN boring disc sharpening technology, which does not need to be trimmed, as it matches the shape of the Wood-Mizer tooth and grinds the entire tooth cavity in a single pass.
The semi-automatic BMS250 offers excellent sharpening quality, an automatic switch, a secure cover that covers the saw during the sharpening process, and an exhaust vent to remove waste gases. The BMS250 sharpener uses a 127 mm CBN grinding wheel, available in different versions for each Wood-Mizer tooth profile. The scraper removes metal burrs from the saw after grinding.
The automatic machine BMS500 is designed for use in industrial sawmills where there is a need for daily sharpening of band saws. The 203 mm CBN grinding wheel provides high quality sharpening, working at higher speeds and at higher productivity. The control panel is equipped with a tooth counter, sharpening speed control and can be programmed to turn off the machine after grinding a certain number of teeth. The machine also has a scraper for removing metal burrs from the surface of a sharpened saw.
An industrial version of the BMS600 is also available, equipped with a more powerful pump, and as a result, providing a higher productivity of the machine.
Saw band sharpening process
Before removing a dull saw from the saw, it is recommended to turn on the machine for 15 seconds and rinse the saw with a washer fluid to maximize the removal of sawdust from its surface. If this is not enough, and sawdust remains on the saw body, clean it with a wire brush.
The sharpening process returns the edge of the tooth to its sharpness and rectangular shape in relation to the saw body. Wood-Mizer recommends using only CBN discs of the correct profile for sharpening, which grind the entire surface of the sinus cavity. This is very important, since microcracks can form in the uncut areas of the tooth sinus, which grow over time and cause premature rupture of the saw. It is recommended that you grind each saw twice. In this case, the pressure of the grinding wheel on the saw should not be excessive.
Removing metal burrs
Removing small pieces of metal left on the edge of the teeth after sharpening is necessary, as these burrs lead to the appearance of microcracks. The Wood-Mizer BMS250 and BMS500 / 600 sharpeners do this automatically. However, when using older models of sharpeners, it may be necessary to debur the saw surface with a piece of wood. Deburring is also important because the saw surface must be clean for a good set of teeth.
Restoring the correct tooth set is very important for the quality of the cut. The set point must not be too high or too low: only the upper third of the tooth is set.
Band saw tooth setting process
To get a high-quality cut surface, you need to make a correct and regular setting of the teeth. The set teeth clear a path for the saw in the wood and remove the sawdust from the cut, resulting in a smooth movement of the saw and a smooth, smooth surface. The more fibrous the wood, the greater the set of teeth, and conversely, for dense or frozen wood, a small set of teeth is required.
Saw teeth set too far apart will result in the board having a rough, rough surface. An insufficient set of teeth results in too much sawdust accumulating in the cut, which overheats the saw. With the correct setting of the tooth, the sawdust should be fine, homogeneous and slightly warm to the touch.
Wood-Mizer Dispensing Devices
The manual setter BMT100 provides good precision and regular tooth set. The operator, using the handle, moves the saw forward and sets the teeth one by one, controlling the process with a micrometer.
The BMT150 setter is also manually operated, but differs in that with one movement of the lever the operator spreads two adjacent teeth in different directions.
The most productive and high-precision setters are semi-automatic machines BMT200 and BMT250 with simultaneous double-sided set of teeth.
Computerized pneumatic adjustable BMT300 machine. it is an automatic machine designed for industrial sawmills.
Tired of the waves on the board? We will tell you how to correctly set the teeth of a band saw.
Fixed and movable plates
The planes of the plates should be rectangular, without bends, wear and dirt. The end of the fixed plate, against which the tooth is pressed, must be straight, without working out.
Before each wiring, the plate must be cleaned, otherwise the dirt adhering to it will certainly knock the wiring and make it uneven.
Recommendations for preparing the adjustable machine for work
II. Manual improved way of setting the teeth (by the type of press)
To avoid the “swing” effect during divorce, before pressing the pusher on the tooth, fix the band saw body so that it cannot move. This can only be done when the body is firmly clamped with a plate under the tooth being bred.
This can be done most simply by separating the functions of clamping the saw body and pressing the pusher onto the tooth. Such machines are on sale. However, it is very inconvenient to part in turn with two movements, although in principle it is possible. But the main thing is that, although the manufacturers have solved the problem of the “swing”, the machine itself is made very poorly, and besides, without some basic units, which still does not allow the band saw to be well bred with such adjustable.
The machine, which, with one push in succession, first firmly clamps the saw body with a plate, and then presses the pusher on the tooth, is very well made and with all the necessary units, only IRN could make. We were one of the first, ten years ago, to acquire such a wrench from them. Until now, saws are bred on it, and we are very happy with it.
When we started selling our grinding machines with a profile disc three years ago, we recommended an IRN adjustable tool for everyone. But in the last year and a half with these wrenches, problems began to arise.. and most importantly, the workmanship has deteriorated. At least many of those who took this adjustable wrench in the kit to our sharpener had to first bring it to us for revision, after which they no longer had problems with band saws.
To prevent users from having such problems anymore, we have developed and are now starting to mass-produce an adjustable machine under the PC30 / 60 index.
Any timber merchant intending to purchase a sawmill naturally hopes to make a profit. But we must remember that for the stable operation of the sawmill, it is necessary to prepare the saws with high quality. over, this will have to be done almost daily. In previous articles, we talked about setting up the sawing process, about a new way to sharpen band saws, and also started talking about one of the most difficult processes in preparing saws for work. the process of setting the teeth. In this post, we will talk more about this process.
Before divorce, it is imperative to remove the burrs formed after sharpening with a wooden bar, otherwise the indicator will give incorrect readings.
If your indicator measures in inches, it is better to immediately replace it with an indicator measuring in millimeters, since one division of the indicator in inches corresponds to approximately two and a half divisions of the indicator in millimeters. Thus, when the sharpener makes a tolerance of two divisions in inches, this corresponds to five divisions in millimeters, which is very large, and conversely, a tolerance of two divisions in millimeters corresponds to only half a division in inches. The layout, when the indicator is calibrated in millimeters, becomes more accurate. The saw cuts evenly, without jerking.
The indicator head should move smoothly, without jamming or getting stuck.
In order for the tip of the tooth to necessarily rest against the plane of the end face of the indicator, it must have a diameter of 7.10 mm.
Every day or at least once a week, it is imperative to check the zero of the indicator. To do this, take a glass (it is easier to make) or a metal plate with a thickness of at least 2 mm, a length of 100.150 mm (so that it stands on the anchor points) and a width of 40.50 mm. The plate is put in place of the saw, fixed with spring-loaded stops or a stop plate, which should press the saw body against the fixed plate, and zero is set.
Since the glass is almost perfectly flat, zero is set very accurately, the main thing here is not to transfer it, otherwise the glass will simply crack.
Saw band design
Band saws are a special continuous design characterized by the presence of cutting elements on one side. This is the cutting element with which woodwork is done. Most often, band saws are used in a variety of band saw blades. With their help, cutting of various parts is carried out. With the help of these blades, a sufficiently high cut quality is ensured. All this is provided only if the saw has a good set. Also, the tool must be serviced in a timely manner.
Band saws are made of heavy-duty metal, which ensures not only high quality of the cut, but also the durability of the saw. The teeth have a universal angle, which allows for the highest quality cutting of the material.
During the work of the canvas, its rupture is very often observed. This is due to the fact that it is poorly sharpened. This is due to the concentration of stress in the blade profile, if the sharpening is carried out at a low-quality level. The need for the procedure is determined by the condition of the band saws. If the surface roughness of the cut increases, this leads to a bluntness of the tool.
Sharpening of the tool is carried out using diamond, electrocorundum, CBN discs. Their choice directly depends on the characteristics of the material being processed. The sharpening of the blade, the production material of which is tool steel, is carried out with corundum wheels. The procedure for bimetallic tools is carried out correctly if a diamond or CBN wheel is used. The instructions will tell you how to carry out this procedure. The most important thing is that the angle does not change in the process.
Wheels of various diameters can be used for sharpening. The choice of one of them is determined by the parameters of the device. For this purpose, profile, flat, dish-shaped, cup circles are most often used. Sharpening is correct if the peripheral speed is 20 to 25 meters per second.
The principle of sharpening tape blades
If there are chipping on the tool, chipping will be observed on the edge of the workpiece. That is why it is imperative that sharpening is carried out correctly. During this process, it is necessary to work not only with the front, but also with the back of the canvas. Sharpening devices can be carried out in different circles. In this case, it is necessary to take into account the angle of the canvas. If you want to carry out the procedure correctly, then you need to learn it from a specialist.
In order for the band saw equipment to work efficiently, it is necessary not only to select it correctly, but also to sharpen it in a timely manner. For this purpose, special circles are most often used. This procedure is as simple as possible, which allows it to be easily performed by a master without appropriate experience.
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When you start sharpening band saws, you should know that the correctness of this process depends on how high quality your lumber will be. boards, beams, slats, etc. Sharpening band saws is a responsible process, but not very difficult. By following the recommendations below, you will quickly learn this simple, but very useful process in sawmilling.
First of all, you need to inspect the tape for visible cracks, broken teeth. To do this, take the tape in your hands with the teeth away from you and move your hands, slightly wringing the tape, start watching. If defects are found, the tape must be sent for repair, or simply thrown away.
Secondly, the tape must be cleaned of dirt and wood resin adhered to it. After all these procedures, the tape is ready for sharpening.
Gently take the tape to avoid injury, as the teeth are sharp enough to hurt your hands and insert it onto the sharpener. The tape must be installed on all holders on the machine and fixed with a special clamp.
We lower the pusher rod into the groove between the teeth, with the help of this rod, the tape feed is regulated. A sharpening stone is lowered onto the belt from above, it is fixed with a rod that regulates the sharpening depth.
Before starting the grinding machine, set the sharpening angle, for a summer forest this angle is 55-60 degrees, and for a winter 70-80. The angle is set by turning the bed on which the stone is fixed, according to the divisions, on the machine body.
Please note that the sharpening stone has a 45 degree chamfer and during preparation for the sharpening process, you must correct the stone if the chamfer does not correspond to the above angle. Dressing is done with a diamond tool or a simple large stone.
Immediately, we note that straightening with a simple stone is more difficult and requires some skills, it also does not comply with safety regulations.
Start the sharpening machine
You have prepared the machine and saw to start sharpening, now we will proceed to the very process of sharpening the band saw.
First of all, turn on the feed at the lowest speed, for this there are toggle switches for turning on the engine and a feed rate regulator, it decreases or increases the engine speed.
Using the screw on the feed bar, move the saw tooth forward or backward and make sure that the stone with the flat side (without chamfer) starts touching the straight side of the tooth.
Then we turn on the second toggle switch, which drives the engine with a stone. Little by little, without sudden movements, you begin to lower the stone with the help of a screw rod that fixes it, until the stone completely passes through the from one tooth to another.
How to Align the Table on a G0555 Series Bandsaw
In no case should the tape be allowed to turn blue, so try not to lower the stone too much, just push the feed rod back or forward, otherwise the stone will simply “eat” your tooth. Sharpening of band saws, should be smooth according to the factory tooth profile.
By manipulating the feed screws and the stone lowering rod, it is necessary to achieve a complete absence of burrs at the tip of the teeth. The finished work of the machine can be considered after passing the band saw at least two circles.
Sharpening band saws in winter
Winter sharpening practically does not differ from summer sharpening with the only difference, the angle of inclination of the teeth more straight reaches 90 degrees, depending on the freezing of wood. The more the wood freezes, the greater the sharpening angle, but keep in mind that in the summer with such an angle the load on the saw increases and its quick failure is possible.
How to sharpen bandsaws on wood correctly
In order for the processing of various materials to be carried out correctly, it is necessary to look after and monitor the condition of the band saws. For this purpose, machines are used for sharpening and setting band saws. Timely care will ensure long-term use of instruments.
Setting the cutting elements of the band saw
Divorce is the bending of band saw blades in different directions. This significantly reduces the friction of the blade and prevents it from pinching. To ensure free movement of the blade against the walls of the material being cut, its width must be greater than the thickness of this material.
Band saw set types
Divorce can take several forms. It may have different names from different manufacturers. Most often it can be:
- Standard, which is characterized by the opposite bending of the cutting elements in various directions. It is most commonly used for band saws that cut hard material.
- Wavy, which belongs to the category of complex structures. Divorce in this case has a variable meaning. In this case, a kind of wave is formed.
Divorce consists in folding not the entire canvas, but only a certain part of its top. The parameters are determined strictly by the tool manufacturers. Their range is 0.3 to 0.7 millimeters.
Protecting. The divorce consists in bending two teeth. In this case, the third remains in place. Designed for band saws for the processing of extremely hard material. In shape, every third tooth resembles a trapezoid. The location is the center of the canvas. With its help, the most correct direction of the saw band is carried out.
Woodworking machines are characterized by a versatile sawing tool design. The spread for soft rock processing must be larger than for hard rock equipment. But the divorce should not be such that the wedge is located in the center without a cutout. The divorce must be characterized by the same arrangement of all cutting elements. It is necessary to spread the teeth in such a way that the deviation is no more than 0.1 millimeter. If the saws are unevenly positioned, this will lead to the fact that the band saw equipment will move to the side during operation.
Cutting shape and blade sharpening angle
The geometry of the cutting elements of band saws can be varied, which directly depends on the material that is intended for cutting. Woodworking machines are most often equipped with special saws, with which you can carry out:
- carpentry work;
- sawing logs and beams;
- use on dividing saws.
The sharpening angle is determined strictly by the tool manufacturer. The rake angle will be as small as possible when using hardwood. Band saws for metal are equipped with saws with different blade shapes, which directly depends on the metal used for sawing. If it is necessary to cut thin-walled metals and at the same time have thin chips, the rake angle when sawing will be equal to zero, then standard cutting is used. The sharpening angle can be varied. It directly depends on the structure of the device.
A tooth that has a positive rake angle is found in saws commonly used for cutting thick-walled metal. The step of the blade, with the help of which the sawing of thin metal is carried out, is quite small. In order to cut thick-walled metal, it is necessary to use devices that have a large number of blades. In some cases, the equipment has a variable pitch to eliminate the resonance effect. The change in the distance between the teeth directly depends on a certain group.
Sharpening band saws for wood video.
Yuri Romanovich, Head of Service Department at Wood-Mizer Industries LLC, gave a lecture on the theory of Wood-Mizer band saws at a seminar in the Chelyabinsk Region. He focused on the terminology, sharpening and setting of band saws, maintenance of sharpening and setting devices, and also gave recommendations for sawing with narrow Wood-Mizer band saws.
Wood-Mizer Band Saw Theory
Each band saw manufacturer uses its own specially developed steel. The band saw is required to be as stable as possible in the cut, which directly affects the surface quality of the material being cut, and also allows it to develop a high cutting speed, which ensures high productivity.
In addition, a certain durability is required from the band saw. The main indicators of band saws for wood are as follows: thickness (1.06 mm or 1.14 mm); web width (32 mm or 38 mm); tooth pitch (22.23 mm); tooth spread (0.58 mm); tooth angle (10 °); tooth height (6.4 mm). In addition, the number of indicators includes an individual digital code. In order to get the most out of the band saw, it is necessary to perform a number of actions with both the saw and the machine. First, you need to prepare the saw depending on the type of wood being cut.
Next, you need to correctly install the saw blade on the pulleys: there must be a certain distance from the cavity of the tooth to the edge of the pulley. The condition of the belts on the wheels must be constantly monitored. If the saw is 0.8 mm from the pulley, the belt must be replaced. It is very important to use the correct belt thickness.
The saws “sit” on the belt with a lot of pressure, so any thickening on the belt adds pressure to the saw, which causes the saw to vibrate and shorten the saw’s lifespan. Sometimes sawdust can build up under the belt, which has the same results as thickening on the belt. The saw should be supported on both sides of the log as close to it as possible.
The correct position of the guide rollers gives the saw additional stability when cutting and the ability to cut at the highest speed, prolongs the life of the saw and increases the lumber cut by the saw. To do this, it is necessary to turn the rollers towards the movement of the saw at an angle of 3 °, set a gap of 3 mm between the roller flange and the rear of the saw, lower the rollers (pressing the saw) by 7 mm, and also adjust in the vertical plane. The saw tension must comply with the manufacturer’s recommendations (150-170 atm).
The sawtooth shape has been developed and verified over the years. Therefore, it would be a mistake to believe that the saw will cut no matter what shape its tooth has. With proper use, the band saw can last until, as a result of regrinding, its width decreases to 65% of the original. The thickness of the saw is determined by the diameter of the pulleys on the sawing machine. The service life and cutting accuracy depend on the thickness of the saw.
Theoretically, the thinner the saw, the longer its service life, since the bending stress in it is lower, but, on the other hand, the greater the risk of its failure as a result of an oversight or non-observance of operating rules. Attachment angle (rake angle), tooth set, sharpness and correct tooth height are the four most important factors in a saw’s ability to cut. All four factors affect productivity and cut quality.
Tooth pitch is the distance between the top points of adjacent teeth. This parameter always remains the same. In the process of sharpening on serviceable equipment, it does not change. Tooth height is the distance from the lowest point of the sinus (cavity) to the highest point of the tooth. The bosom is the space between the teeth that “takes out” the sawdust when sawing.
When sharpening the saw, select enough material from the saw bore to obtain the appropriate height. The depth of the tooth cavity is about 30% of the step. To ensure a long saw blade life, the groove should not be hardened during sharpening and should not contain stress concentrators, scratches or burrs. There are many cracks in brittle burrs that can easily penetrate the saw, especially in valleys where stress is greatest. After sharpening, all burrs must be removed from the teeth.
If sharpened correctly, they can be easily removed with a wooden block. The angle of engagement (rake angle) is the angle of inclination of the leading edge of the tooth relative to the ordinate 90 °. It allows the tooth to cling to the wood when cutting. The tooth must remove enough wood for the saw to sink into the log itself. The value of the hook angle is selected in such a way as to reduce the feed force.
If the angle of engagement is too large compared to the feed rate, it will result in rattling, uneven (rough, rough) cuts and poor cut quality. The saw will pull sharply against the tree and the leading edge may protrude too far beyond the sheaves. If this angle is too small, the saw will have to be forced into the log, which will reduce the cutting speed and, as a result, productivity. The size of the hook angle is determined by the type of wood and the rate of performance.
For most sawing operations, a hook angle of 10 °.15 ° is recommended. Saws with an incorrectly selected hook angle can cause cracks, especially in the sinuses (cavities) of the tooth. The radius at the base of the tooth is built into the saw grip and removes sawdust. During the sawing process, the force at the tip of the tooth acts against the tooth. This opposition creates a lot of stress at the base of the tooth. The radius spreads this stress over an area large enough to reduce the impact of stress on the saw’s lifespan.
Too low (small) radius will cause the saw to break. Too high (large) radius on the tooth will cause it to clog quickly, which will slow the cutting speed and shorten the saw’s lifespan. The same is the effect of too much tooth height. In addition, too high a tooth does not hold the setting well.
Band saw preparation
Incorrect sharpening and setting of the saw is the main reason for its premature failure. Tool preparation is essential to get a quality cut. Therefore, work on improving saw sharpening and setting devices continues at Wood-Mizer continuously.
This type of motor is renowned for its long and trouble-free operation as it has no brushes or commutators. It is ideal for equipping a sharpener, that is, an object where there is an abrasive material. oil and metal dust. Other types of engines quickly fail under similar conditions. At the time of installation of the saw, the head of the sharpening device rises up, and the saw itself is easily inserted into the clamp.
The control panel is mounted in such a position to provide easy access to the controls. A hole is provided in the cover of the sharpening device, to which a pipe can be connected to remove gases released during the sharpening process. The latter is especially important in workshops where several sharpening devices operate. The sharpener must be kept in good condition. Backlash in bearings and guides is not allowed. Vibration of the grinding wheel and backlash in the feed mechanism can damage the teeth.
Wood-Mizer supplies specially designed borosonic grinding wheels. They are available in three profile options to match exactly the Wood-Mizer tooth design. The 10/30 profile is the most popular and versatile tooth profile, the 9/29 profile is ideal for sawing frozen and hard wood, and the 13/29 profile is used for freshly cut soft wood. in particular pine and spruce.
Tooth set is the distance the tooth is deflected in relation to the saw blade. Tooth set is an important factor in saw performance. The more the tooth is spread, the wider the cut will be and the more engine power is required. The purpose of the tooth setting is to create a gap for the saw in the kerf. In other words, you need to reduce the friction between the tree and the saw so that the saw can go through the cut without overheating. The amount of spread depends on the type of wood. The softer and more fibrous the wood is, the more the teeth are set to reduce friction against the fibers. Soft woods have coarse, long fibers, while harder woods have virtually none. The latter also applies to frozen softwood, which is sawn with slight wiring.
To ensure accurate setting (/.0.0025 mm (0.001 “)), Wood-Mizer uses a new screw system to replace the old lever system. The new sharpener is less tiring for the operator and ultimately results in more high accuracy and speed of setting the saw.In addition, the stand for the setting device has been modified: now the position of the device in relation to the operator can be adjusted and thus easier to read the readings of the device.All these factors have increased the accuracy of the setting, which in turn improved the accuracy and smoothness of the cut.
Wood-Mizer produces saws with 9 ° or 10 ° grasping angle. Saw sharpeners and setters can change the grip angle and tooth set.
How to find out if the saw is set correctly
The setting can be considered optimal when there is a mixture of 65-70% sawdust and 30-35% air between the saw blade and the tree it is sawing. The external manifestation of the fact that the saw is set correctly is the release of approximately 80-85% of sawdust from the cut. In cases where the saw is set too far, not enough sawdust is thrown out.
If the saw is not diluted enough, tightly compressed, hot sawdust remains on the surface of the board. In fact, the sawdust should be warm to the touch, but not hot or cold. A saw that is too far apart is more likely to cut in jerks, and when not set too far in waves. If you are sawing logs with a diameter of 30 cm at a good speed, and the sawdust is warm to the touch, then you should not try to cut a log with a diameter of 60 cm with a saw with the same layout, because it will have to remove twice as much sawdust from the cut. Increase the wiring by about 20%.
The conclusion that suggests itself: logs should be sorted by thickness before starting to saw them. Another important point: only the upper third of the tooth should be diluted, and not the entire tooth “under the root”. During the sawing process, only the sharp corner at the very top of the tooth should be involved. It should also not be forgotten that the indicator on the adjustable device is a precision instrument. It costs nothing to knock it down. He works in an extremely stressful mode. Therefore, the indicator wears out over time, and its installation should be checked often.
Set point on the tooth
When setting the saw, special attention must be paid to the position of the saw in the setting device. the bend line (saw blade) must be at the lowest point of the bosom or higher. The bend point (where the pusher of the adjuster pushes against the tooth) should be about half the height of the tooth. If the bend line is too low, the tape itself will bend, not the tooth. This will cause the saw to break prematurely. When the bend line is too high, the top of the tooth will bend, the saw will be unstable and the cut will be wavy. This slows down the cutting speed and can lead to premature saw failure. Incorrect sharpening and setting of the saw is the main cause of premature saw failure. The entire sharpening and setting process will prolong the saw’s life.
Saw Rig Problems
They start routing only after the saw is sharpened, and the edge is cleaned of burrs. Here are some basic details to watch out for. Firstly, this is the installation and verification of the indicator. Verification usually does not cause any problems. However, users often forget about setting the indicator tip, which must be correct across the full width of the indicator in relation to the measuring plate supplied with the wiring device. Secondly, this is setting the height of the mainsail (mast) and determining the point of inflection of the tooth. The correct position of the mainsail is shown in the figure. It should be at 1/3 of the top of the tooth.
If the position of the mainsail is already correctly adjusted, you need to pay attention to the correct installation of the limiters (counter rails). They must be positioned so that each tooth folds over at the same point. This is a very important operation because it affects the accuracy of the cut. Thirdly, the installation of the cheeks of the adjustable device. In this case, you should pay attention to two important points. This is the distance of the tape step from the edge of the cheeks, which should always be at the same level, ensuring the bend of the tooth, and not the rotation of the tape (this, by the way, is a very common mistake). And this is the state of the pressure plate guide bolt.
These bolts will wear out over time and can cause miswiring. The first symptom that the bolts have become unusable is the presence of free space between the pressure plate and the permanent plate. This can also be noticed at the moment of bending the tooth, if the tape first turns, and then the mainsail begins to bend the tooth. According to Wood-Mizer experts, by paying attention to these seemingly small details, the operator of the sawmill equipment will significantly improve control of the saw setting process.
All equipment requires timely technical support (sharpening and setting the tool), this type of sawing equipment is no exception. Due to timely processing, the device will be kept in working condition for a longer period of time. The service life and technical capabilities are significantly increased by the wiring. The meaning of this process lies in the following manipulations: the cutting teeth are bent in different directions, thereby reducing friction and minimizing the risk of pinching the panel. There are three types of wiring:
To bend the teeth, you need specialized equipment, thanks to which you can carry out the wiring as soon as possible. The next step is sharpening the blade. To understand if your tool needs sharpening, pay attention to the material being processed. if it has roughness, then it’s time to sharpen the inventory.
How to sharpen a band saw correctly? This question is always relevant. The working elements of such a machine are special discs, when choosing which it is very important to pay attention to the quality of the material from which they are made. Having decided to sharpen the machine, the user is recommended to pay attention to the following factors:
- during processing, a uniform ball must be removed over the entire surface of the tooth;
- so that the teeth do not overheat during processing, it is necessary to use a special cooling agent;
- profile and height indicators of working elements should not change;
- pay attention to the pressure, if this factor is not taken into account, equipment may be damaged.
Band saw. what is it?
This tool looks like a metal strip with sharp teeth. It is used for processing different types of materials. The quality indicators of the cut directly depend on the regular correct sharpening. If you decide to service the saw yourself, you need to strictly adhere to all the recommendations of specialists, it will not be superfluous to also carefully study the technical information.
Band-type saws differ in the material from which they are made, as well as in the geometry of the cutting element. Devices for wood processing, in turn, are divided into:
- and for working with logs.
Different types of tools are characterized by individual parameters, such as the angle and shape of the sharpening, the size of the panel. To work with hard tree species, use equipment with a smaller sharpening angle.
How to sharpen band saws correctly
People who often use a band saw should be aware that they can sharpen it themselves if necessary. Having studied the information about the features of sharpening this tool, you will no longer have to spend money on professional processing, you can do it yourself. But there are some nuances that should be taken into account. It is important to remember that processing with a specialized machine is of higher quality than manual processing. A properly sharpened tool remains in operational condition much longer and does not require re-processing for a long time. This article will show you how to sharpen a band saw correctly for wood.
There are such ways of sharpening:
- Full profile. To implement this scheme, automated machines are widely used, which are equipped with CBN wheels. It is impossible to perform such an operation with your own hands without the use of special equipment. According to the technology, each type of tool has its own working discs. This treatment gives a smooth transition at the base of the teeth.
- Sharpening the edges. You can carry out manipulations of this type both on the machine and manually. For manual processing, you can use a standard engraver or file. For more efficient sharpening, it is still better to choose a specialized machine.
When you sharpen your teeth by hand, there is a possibility of certain problems, such as the occurrence of irregular sinuses, non-observance of slopes and angles. We hope our review has given you a hint of how to sharpen your band saws correctly. If you do not have enough knowledge and experience, it is better to trust a professional.
How to sharpen and spread the saw yourself
At the end, you can see that the even teeth are deflected to one side and the odd ones to the other. The second way is to use a special tool for this procedure.
How to properly care for your saw
To your own as well as someone else’s instrument must be treated very carefully. And he will serve you faithfully for a long time. The stove should be wrapped with material during storage, or it can be placed in a special case. You should not store such a tool in the winter on the balcony.
Sharpen the saw
So, the teeth are set, which means it’s time for sharpening. This job is easy with simple tools. You can use an ordinary triangular file. When sharpening the band saw, the file should move away from itself at this time it should be nestled against the tooth. When we pull back, we tilt slightly to the side.
Remember, for a band saw, the teeth must be sharpened from two tops.
Sometimes you can correct the teeth with a regular bar. However, with constant sharpening of the band saw, the setting slowly fades away. Since the teeth are aligned. To prevent the saw from losing its working shape, it is necessary to repeat the process of setting the teeth. It is worth noting that this is not required so often.
Why is it necessary to breed the saw
During the process of setting the band saw, the master folds back each zoom in turn. If the first tooth is bent to the right, then the next one is bent to the left.
Why split saw teeth at all? It should be understood that the width of the cut should be greater than the thickness of the saw blade itself. Otherwise, the lance will simply get stuck in the workpiece while cutting. At the same time, an incorrect set of teeth leads to deformation of the saw blade. In this case, it will be impossible to make an even cut.
Types of Saw Bands
The main difference is in the size of the teeth. But there is also:
- two-handed saws;
- single saws.
All types of band saws are sharpened and bred in the same way. The only difference is how many people are needed to use the tool. In the first case, you need two and in the second one.
Band saws are used mainly for cutting wood and materials based on it. Since it is a soft material, it can be easily drilled or sawed. Experts advise in any case, it is necessary to fix boards and logs well in the process of cutting them. Fingers should not be placed close to the cutting site so as not to inadvertently damage them. As injuries from the saw can be quite severe.
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 give you 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 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 the machines on which the saws are sharpened and set, 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 sawtooth spread, which is very convenient: you do not need to endlessly unscrew and reconnect the pusher to find out how the sawtooth 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 spread 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 with a cone, or they become conical because the saw has sharpened them, then even with the correct 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 familiarize yourself 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.