How to sharpen and breed band saws
HOW TO SHARPEN AND RAISE BAND SAWS
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 recommends resting the sharpened saw for one day before placing it 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 sharpening only CBN discs of the correct profile, 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 sharpening disc 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, since 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 remove any burrs from the surface of the saw with a piece of wood. Deburring is also important because the surface of the saw must be clean for a good set of teeth.
How to Sharpen Bandsaw Blades
The restoration of 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 cutting 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 flat and 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 sawn board having a rough, roughened 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 setting devices are semi-automatic machines BMT200 and BMT250 with simultaneous double-sided setting of teeth.
Computerized pneumatic adjustable BMT300 machine. it is an automatic machine designed for industrial sawmills.
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 you can only sharpen a circular saw with a whole set of tools, the band can be brought into working condition with just 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.
Why bred a saw
Setting is a process that causes the teeth of the band saw to bend back and forth. Even teeth are bent to one side, odd teeth to the other.
Before diluting the band saw, you need to understand why it is needed. Pointless processes usually do not bring good results. It is known that during sawing, the cutting width should 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.
The ways 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 by 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.
How to sharpen and spread a saw
- 1 Why bred a saw
- 2 Wiring methods
- 3 Sharpening
- 4 Caring for the saw
- 5 Types of band saws
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.
Care It is important to be able to not only raise 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 moisture gets on the saw, 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 stored usually wrapped in material. You can also provide a case for it. Leaving the tool on the balcony for the winter is not recommended.
Types of band saws
Band saws vary in tooth size. You should also highlight:
- two-handed saws;
- single saws.
Two-handed saws are sharpened and set in the same way as regular single-handed saws. The whole difference between such a tool is that two people work with it at once.
With the help of band saws, wood and varieties of this material are most often cut. Wood does not require too much impact, it is a soft material that is easy to saw and drill. However, in the process of work, it is still advisable to fix the logs and boards. When cutting, be careful not to keep your hand too close to the cutting furrow. This can lead to serious injury.
To service the blades, it is not enough to sharpen the teeth, it is also necessary to dilute them. These two procedures are performed in succession: they start with setting the teeth, and finish them with sharpening. It is required to strictly adhere to such a chronology of works. Breeding is carried out in order to reduce the friction of the saw in the process of cutting a particular material (wood, metal, plastic, etc.). There are several methods of dilution, which depend on what elements need to be obtained subsequently processing and the strength of the starting workpiece.
Sharpening and setting band saws
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 for sharpening and setting band saws are used. Timely care will ensure long-term use of instruments.
Sharpening teeth and angles
The profiles of the blades depend on their purpose and the properties of the materials being cut. The main distinguishing parameters are: sharpening angle, shape of teeth, setting distance. Profiles are marked as follows:
- WM. universal, for materials of different hardness;
- AV. for longitudinal cutting along the grain of wood, used for hard grades;
- NV. used for curly or decorative cutting;
- NU. for soft materials, has a wide pitch;
- PV. analogue of NU, but with flattened teeth;
- KV. for soft materials, fits wide saws;
- PU. for hard materials, used for mounting on wide saw blades.
Shop Work: How to sharpen your bandsaw blade
The sharpening angles of band saws are selected as follows:
- 35 0 for carpentry saws;
- from 18 0 to 22 0 for dividing lines;
- up to 15 0 for sawing timber.
The subtleties of the setting of band saws
As the tool is used, the quality of its cutting edge decreases. Therefore, setting and sharpening the band saws correctly is a natural part of the workflow.
Note! Divorce should be done before sharpening, not after!
Setting is the operation of bending the teeth to the sides to prevent the tool blade from jamming and reduce friction. There are three main types of wiring:
classic. the teeth are bent to the right and left of the sides strictly alternately;
cleansing. every third tooth is left in its original position. “Relevant” for tools used for cutting especially hard materials and alloys;
wavy. each tooth has its “own” value of the bend size, thus, a wave is formed from them. This is the most difficult type of wiring.
Worth knowing! When divorcing, not the entire tooth is bent, but only part of it. a third or two-thirds from the top.
The manufacturer’s recommended divorce values fall within the range of 0.3-0.7 mm. The operation is carried out using special adjustable tools.
Sharpening a band saw has a number of the following features:
- it is forbidden to use abrasive discs and hand sharpening tools with uneven wear of the working surface;
- when turning, it is important to perform all movements evenly, without jerking, uneven movement of the tool, since there is a high probability of violation of the geometry of the teeth;
- on the machines used, liquid cooling is required to prevent overheating of equipment and tape;
- after the completion of the work, there should be no burrs and chips on the surface, since they can negatively affect the quality of the cut;
- when sharpening a tool for winter use, it is important to increase the angle of inclination of the teeth to 90 0. However, it is unacceptable to use such a tape for woodworking in summer due to increased loads on the cutting edge;
- when sharpening on machine tools, you need to make sure that the disc is correctly positioned relative to the belt profile;
- the speed of the grinding wheel is selected so that the metal is not red-hot, since in this case it will lose its strength properties;
- if the band saw was operated without maintenance or the recommended service life was exceeded, then during turning it will be necessary to remove a larger layer of metal in one pass;
- to control the quality of the sharpening of the tool, it is recommended to use a new tape as a reference;
- It is forbidden to change the factory shape of the teeth, as the saw will become unusable;
- the need for sharpening is determined by the degree of wear of the teeth by 35% of the original dimensions.
Uneven abrasive disc
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 carried out. 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 cutting quality, but also the saw’s durability. The teeth have a universal angle, which allows for the highest quality cutting of the material.
How to sharpen a band saw?
Band saws are closed-type tools used in industry for processing various materials. Allows for high cutting speed and minimal waste. However, due to the increased loads, the cutting part becomes dull and it is required to sharpen the band saws in compliance with the technology requirements.
Sharpening band saw
How to dilate and sharpen a hand saw
When working with wood, a tool such as a hand saw or a hacksaw is often used. Over time, the blade will wear out, making the sawing process more difficult. In this case, it is necessary to open the saw. This procedure consists in the fact that the teeth are unbent in different directions manually or automatically.
Hand Saw Routing Methods
It is best to do this on special equipment. an adjustable machine. On it, using the indicator, you can determine the correct deviation of the tooth, so the work can be done in a matter of minutes.
If the machine is difficult to find, you can manually spread the hacksaw. However, it will take a lot of time and effort to complete the procedure, and besides, you cannot do without a special tool. wiring, which you can make on your own. It is a metal plate with a sawn groove 1.5 mm wide and 5 mm high. The saw is clamped in a vice and with this groove the tooth of the tool is grasped and retracted in the desired direction.
This must be done in a specific order. First, the teeth are deflected through one in one direction, then the rest in the other. In this case, there should be no distortions, and the teeth should be unbent symmetrically. Not the entire tooth is bent, but only its tip (that is, its third part), otherwise it may break. The width of the setting should be equal to twice the thickness of the blade, if the teeth are spread too wide, then the hacksaw will go tight, and too much wood will go into the sawdust. In addition, if the setting is incorrect, the tool will “wedge” and an even cut will not work.
You can also spread the saw with a screwdriver or chisel. The tool is placed between the teeth and turned, the saw should also be clamped in a vice before this.
How to sharpen a hand saw
After the divorce, the saw must be sharpened. This procedure does not require special equipment; here you can get by with an ordinary triangular file. The sharpening technique with this tool is as follows. The file is taken with one hand by the handle, with the other by the tip of the tool and moved away from you, pressing the teeth smoothly and evenly, then in the opposite direction, without touching the teeth. Handsaw teeth need to be sharpened on both sides, from top to bottom.
After sharpening, burrs can form on the edges of the teeth, which will negatively affect the operation of the tool, chipping and dulling the teeth. They must be removed with a fine cut file.
Caring for your hand saw
It is necessary to be able not only to make a divorce and sharpening of the saw, it is equally important to store it correctly. When the saw is not in use for a long time, it must be kept in a dry and warm room, otherwise, if moisture gets on it, it may rust. Even if the tool is treated with special agents, this will not guarantee that it will not corrode.
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. During storage, the stove should be wrapped with material, 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 slightly deflect to the side.
At the same time, we need a whole set of tools to sharpen a circular saw. And we sharpen the band saw with an ordinary file with three edges.
Remember, for a band saw, 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 will slowly disappear. 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 should be noted 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 peak will simply get stuck in the workpiece during sawing. 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.
How to sharpen and dilate a saw yourself
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 defects in 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 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 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 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 have 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 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 on 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.