tangential board. General information about wood. Types of cuts

The range of lumber offered is quite wide, woodworking products differ in quality, cost, as well as in the types of wood sawing. Let's take a closer look at what types of wood sawing exist, and for this, we first consider in general terms what the technology of sawing wood is directly.

Sawing wood

First of all, the log is unraveled on a belt or circular sawmill, turning into a gun carriage. If all sides are propylene, then the output will be edged material, which is divided into timber, small timber and edged board. Planed patronage is called lining, floorboard, platbands and baseboards. Glued products include, for example, furniture boards.

There are two main types of cutting wood (logs) into boards (lumber):

radial;
tangential,

as well as three additional types:

mixed;
semi-radial (rustic);
central.

Types of cutting board

Radial cut- this is a cut, in which the axis of the cut passes through the core of the log and, as a result, the lines of annual rings in the section of the board form an angle of 76 - 90 degrees. with its layers (two main planes of the board). The wood of radial sawn boards is quite uniform in color and texture. Such boards practically do not deform during shrinkage and do not swell from moisture, because. the change in the size of the wood occurs mainly along the line of the rings (across the fibers), and for the boards of the radial cut, they are located in thickness. Radial sawn timber has the highest performance compared to sawn timber of other types of sawn cut.

Tangential sawing- this is a cut that is made tangentially to the lines of the annual rings of the trunk at some distance from its core. The faces of such boards have a pronounced texture and a bright wavy pattern of annual rings. At the boards tangential sawing the coefficients of shrinkage and swelling from moisture are twice as high as those of the boards of the radial cut, which causes their significant deformations when the moisture state changes. For this reason, tangential sawn boards are less preferred for wet conditions than radial sawn boards.

Rustic (semi-radial) and mixed cuts- these are cuts with signs of two main types of cut at the same time: radial and tangential, and, as a result, have indicators averaged between them. In a rustic cut, the lines of annual rings have the form of straight lines located at angles of 46 - 75 degrees. to the layers, and in a mixed cut, these lines change from straight lines at the edges (in width) of the board to arcuate ones in the middle.

Central cut- this is a cut made right in the center of the trunk and including its core. Given that the core of the trunk consists of the least durable wood, central sawn lumber has the most heterogeneous structure in terms of strength of all the types considered.

Features of the main types of sawing

At tangential sawing the cut plane passes tangentially to the annual layers of the tree at some distance from the core. Since wood fibers, as a rule, do not have a single direction, they create natural patterns on the surface of the board in the form of bizarre "arches", "curls", "rings". The texture of the resulting tangential sawn board is not uniform, wood pores may be present. On some of the dry boards, delamination may form on the surface after fine planing. After tangential sawing, the boards are characterized by higher shrinkage and swelling coefficients, moreover, such a log sawing scheme allows increasing the useful yield, which in turn leads to a reduction in the cost of the board.
For radial cutting of wood, the cutting plane is perpendicular to the annual rings. With this method, the texture of the board is quite uniform with a minimum distance between the annual layers. It not only creates beautiful drawing, but also contributes to increasing the strength of lumber.

Boards radial cut have good resistance to external influences, have greater resistance to deformation and wear resistance than tangential sawn boards.

The shrinkage and swelling coefficients of radial sawn timber are 0.18% and 0.2%, respectively, which is almost two times better than that of tangential sawn timber. The reason for this phenomenon is that for radial sawn boards, shrinkage and swelling occur along the thickness of the material, in contrast to tangential sawn boards, in which dimensional changes occur along the width of the board. This explains the fact that finished products (parquet board, floor board, block house, imitation of timber, lining) from radial sawn lumber on the front surface there are almost no cracks, which is not excluded for products from tangential sawn lumber. To obtain glued beams by splicing wood without knots, blanks and boards of precisely radial and semi-radial cut are used, since the mechanical and geometric characteristics of the beam depend on the resistance of the fibers, which increases when gluing layers with multidirectional annual rings with an angle of inclination up to 45 °.

The average efficiency of radial sawn boards is only 10-15%. This explains their high cost. Radial sawing includes lamellas, in which the angle between the annual rings and the face is 60-90°. If the specified angle is in the range of 45-60°, such boards are referred to as semi-radial sawing. the best operational qualities has lumber, in which the angle between the annual layers and the cutting plane is 80-90 degrees. Taking into account boards of a semi-radial cut, the coefficient of useful output can reach 30%.

Usually, when radial sawing the log is initially sawn into quarters, and then from each quarter boards are sawn alternately from two layers. For sawing logs in a radial way, for example, rip saws UP-700 can be used. Of importance is the UP-700 microprocessor control and optimization system, which is used by technologists to determine the yield percentage of a radial sawn board based on maximum yield optimization criteria. finished products, as well as the conditions of radiality and semi-radiality of the cut.

Comparing the radial and tangential types of cuts, we can draw several conclusions:

Radial lumber has the best properties shrinkage and swelling.
Radial cut boards have better mechanical characteristics and dimensional stability.
The wood of radial sawn boards has a uniform shade and uniform texture, which gives a special decorative value to finished wood products.
Due to their characteristics, radial boards are more widely used, although they have a higher price.

The main dimensions of lumber

There are standard dimensions for lumber. For example, the cross section of a beam can be 10x10, 10x15 or 15x15 cm, and the length is 6 m. Deviation from these standards will require a special order, and will also be associated with additional financial costs. The most expensive is profiled timber, manufactured according to the highest purity class.

The edged board can be 2.5 cm, 4 cm or 5 cm thick, 10 cm wide, 15 cm wide, and be standard 6 m long. The length of a small beam, in addition to the typical value of 6 m, can also be equal to 3 m Its cross section will be 4x4 cm or 5x5 cm. A by-product of the production of these lumber is a slab, on one side of which there is a layer, and on the opposite side - raw wood.

Lumber Selection Criteria

Before choosing good lumber, the first step is to find out the type of wood offered. It can vary from 4 to 0 depending on the number of knots and their quality. Be sure to check the length of the lumber and the dimensions of the section. If bends or rotational deformations are visible, then it is better to refrain from buying such products. You can check the evenness of the lumber by attaching a stretched cord.

Wood is valuable natural material which is created by nature itself. People have been using this wonderful raw material for many centuries to build houses, create furniture, decorative interior items, and also use it for industrial purposes. For these reasons, the competent processing of a felled trunk is an extremely important task. Sawing and planing wood are the most important wood operations. In this article we will talk about what wood sawing is and what types of sawing exist.

Log sawing is the process of converting valuable natural raw materials into lumber. When sawing wood various methods available various sizes lumber. To obtain quality products, you need to choose high-quality, even logs that are not damaged by pests.

Types of sawing wood

Quality final product depends on a large number factors - types of wood and quality of raw materials, professionalism of workers, proper drying. However, there is another important aspect - this is the method of sawing timber.

There are such cutting methods:

tangential
radial
rustic
longitudinal
transverse.

Rustic is a cut that is performed at an acute angle to the direction of the fibers. This method is used in the manufacture of lumber for rustic floor covering, which can be called the most heterogeneous and original in pattern and shade.

During the tangential cut, the cut plane runs tangentially to the annual layers of the material at a certain distance from the core. Since the wood fibers, most often, are located in different directions, a natural pattern is obtained on the surface in the form of bizarre "arches", "curls", "rings". The structure of the board with this sawing option is not uniform, wood pores may be present. At the end of the tangential cut, the boards are characterized by an increased coefficient of shrinkage and swelling. Also, this scheme of sawing logs makes it possible to increase the coefficient of useful output, which causes a reduction in the cost of the final product.

Sawing wood blanks by the radial method is carried out perpendicular to the annual rings. Thus, a homogeneous board is obtained with the smallest gaps between annual layers. This creates an attractive pattern, and also increases the strength of the lumber. Radial materials are characterized by high deformation resistance and wear resistance. Also, such boards have lower rates of shrinkage and swelling in comparison with tangential sawn timber. Therefore, finished products, for example, a parquet board, batten, block house, lining, practically do not crack on the front part, but the materials tangential sawing subject to such events. Glued laminated timber is created only from boards of radial and semi-radial cut, because the mechanical and geometric parameters are directly dependent on the resistance of the fibers. This resistance increases during gluing of layers with differently directed annual rings at an angle of inclination of no more than 45°.

Only 10-15% of radial boards can be obtained from a single log. Therefore, they have a high cost. The best performance is demonstrated by a material that has an angle between the annual layers and the cutting plane from 80 to 90 degrees.

Sawing wood across the grain

The technology of sawing wood across the fibers is the most common method of processing timber in joinery. However, such sawing can be called the simplest. Longitudinal sawing wood requires much more effort and certain skills.

Tools for cross cutting timber are selected depending on the required accuracy, the amount of work and the conditions available in each individual workshop. You can use:

electric circular saw. She makes neat and fast cuts. For domestic use Great fit model with 1000 W motor and 180 mm disc section. Most of circular saws They come with a combination blade that can be used for a wide variety of jobs. The teeth of this blade are a cross between the teeth of a rip saw and a rip saw. For long work, it is better to take a blade that is coated with carbide. Its cost is higher, but it blunts 10 times longer
miter box and tenon saw. They are used for finishing. With these tools, you can make the most accurate cuts.
circular electric saw
cross saw. When buying, pay attention to the fact that the teeth of such a tool must be alternately set apart to the left and right of the blade itself. They should be well sharpened and be beveled. The most popular can be called a saw with 10 teeth per 25 mm blade. With 8 teeth, the saw will cut faster, but will create rough cuts.

Wood is a valuable natural product that nature has created and it is very important to learn how to use it correctly. After all, just as there is no identical fingerprint for a person, there is no similar tree in the forest area. Mankind has been using wood for various purposes for many centuries in a row: it builds houses, assembles furniture, skillfully creates decorative interior items and uses it for industrial purposes. That's why correct handling felled tree is a very important task facing the masters of their craft. As the saying goes: “If you chop down a tree, then only to create a masterpiece!”

What is wood sawing? In a nutshell: this is the transformation of a valuable natural resource into lumber, i.e. sawing - processing a tree trunk in any way to obtain material suitable for household, technical and industrial needs.

To get the output quality product, the raw materials for its manufacture must also be good. If trees of the necessary and correct sizes, then drink from it a large number of highly productive material will not be difficult. The main thing to remember is three fundamental factors - this is resource quality, the shape and volume of the tree and correctly selected types of wood sawing.

A good resource is a fresh resource. It is best to start working with wood immediately after the tree has been cut down. The more knotty and curved the trunk, the harder it is to get good lumber out of it, so before starting sawing, you need to sort the logs according to their quality features, and only then use the equipment for sawing wood.

There are no ideally round trunks, therefore it is considered that a log has 4 sides, each of them consists of a quarter of a circle and occupies its full length. These 4 faces do not overlap. There is such a thing as a “clean line”, the higher it is, the greater the value of wood. Such a face is free from various defects: cracks, scars, branches, chips, rot and damage.

Wood sawing technology

On an industrial scale, complex and expensive equipment is used to process trunks, and cutting wood at home takes place with a minimum set of tools: it is manual and electric saw, jigsaw. In order for the products to look neat, you need to know some of the features of the process.

You can start with sharpening the saw and bending its teeth. Sharpen it with a file. The teeth are set in different directions so that the saw blade does not jam in the cut. To do this, use pliers, and bend the teeth alternately, then in one direction, then in the other.
Before starting any woodworking, you need to make markup. To do this, use rulers, tape measures, squares and other devices, and draw a line with a pencil, felt-tip pen, pen or marker. When marking the workpiece, it is necessary to ensure that areas with defects do not fall into the sawing area.
Sawing wood with your own hands involves workpiece fixation any of the mounting methods. It can be a clamp or a miter box when the workpiece is sawn at a certain angle.
The next stage is sawing. It is best to start sawing the workpiece in the longitudinal direction, and only then in the transverse direction. All movements while working with hand saw are made in jerks and in a swing. If the saw is electric, then the process will be faster. For sawing at home, you can use a jigsaw, it is usually used for hard rock or large blanks to facilitate the efforts of the worker.

Modern woodworking machines allow you to speed up the processing process both at home and in small and medium-sized businesses. A band sawmill is one of the mechanized ways of preparing lumber. Sawing wood for band sawmill occurs along the trunk, so from any log you can make a beam, board, veneer or gun carriage. Such a machine can work with any kind of wood: soft and hard, as well as highly resinous, making edged and not edged board. The whole process of working on such a sawmill consists of only 3 steps:

Preparatory stage when the workpiece is given the necessary shape, and also adjusted to one size.
Actually processing step, when the operator sets up the work parameters and then presses the "start" button.
final stage, when the specialist is already manually refining minor errors left after the operation of the machine.

Cutting tool for sawing wood in this case it is band-saw 60 mm wide. The principle of its operation is based on sawing a stationary object, fixed between two guides with fixed movable stops, with a horizontally moving saw blade. The thickness of the resulting material is set at your discretion. If the sawmill is processing different breeds wood, then you need to carefully monitor the settings for a specific material. Need to follow up correct installation workpiece feed speed, so as not to break the saw. The system for adjusting the supply of lubricant is necessary so that the waste when sawing wood (sawdust) does not stick to the saw teeth and saw pulleys. This significantly extends the life of the equipment.

Laser cutting when sawing wood is increasingly used for reasons of economy, increasing productivity and increasing the accuracy of processing. Due to the cutting accuracy, this processing reduces waste quantitatively and minimizes residues. Laser sawing of wood produces and heat treatment cut, so the material can last longer due to the protective layer formed. This industrial processing of the barrel does not require any special efforts to complete the operation, it is possible to cut material of almost any thickness. Due to the fact that wood is a flammable element, the laser cut area must be cooled to prevent ignition.
Wood sawing machine used only in industrial scale. These are large bulky units with high labor productivity, allowing you to work continuously (in shifts) under heavy load. These machines include:

Circular saw - it is intended for transverse and longitudinal sawing, as well as sawing at an angle, the cutting tool of which is a circular saw.
Multi saw machine - it is used for cutting and cutting wood materials, several saws are involved sequentially or simultaneously in the cutting process.

Wood sawing line- already a whole complex, which can consist of one or more machines. This is an expensive equipment that can only be used if there is a large amount of raw materials. There are several representatives of this class of machines:

split saw line allows you to saw and chop logs of any tree species. The work is done by disk or chain Saw. This line is easy to operate and Maintenance, well suited for thin logs and large logs.
Round timber processing line is intended for processing timber into the output of edged round timber, sawdust and wood chips, canting and processing boards. They have two saw modules and a pneumatic system for removing sawdust.
Log sorting line designed for sorting logs in order to optimize sawmilling and obtain maximum yield and sawing performance and in monitoring to check the volume of purchased logs.
Optimization line automates the supply of timber at the entrance, replacing completely manual labor when feeding stems.

If you decide to start your own wood sawing business, then first you should decide on the volume of lumber production, and then the decision will come which method and equipment to choose for this.

Wood sawing services

How much does wood sawing cost?- the question is rather rhetorical, it all depends on who will carry out the work and in what way it will be done.

Such services can be provided by organizations that remove unnecessary green spaces, immediately after the removal of the tree. If the plant was small or there are a number of trunk defects, then such wood is used in household activities or the trunk and large branches are sawn for firewood. When there is a removal of objects, for example, for planned construction, in the amount of more than one piece, and forest stands at the same time represent a production attractiveness, then we can already talk about the value of such lumber.

In order to start cooperation with the company, sometimes it is necessary to conclude a contract for sawing wood, which will indicate all the technical points, the timing of the work and the cost of this process. You can draw up an estimate - this is a document that indicates how the work will take place and in what way, as well as the type of wood, because different types of wood are also cut and processed in different ways.

There are a great many types and classifications of wood: hard, very hard, soft, seasoned, resinous, with and without knots, etc. It is clear that the harder it is, the more difficult it is to process, and the more knots it contains, the more waste there will be.

When sawing a log, the location of the fibers is also taken into account. From here, three types of sawing are distinguished:

Radial sawing of wood(with a chainsaw or using longitudinal sawing machines) is a method of processing the trunk, in which the fibers in the resulting board go along the direction of the growth rings. This type of cutting gives large quantity of the resulting product at the output, and surpasses all other types of wood processing in terms of strength and hardness. Such lumber is obtained uniform in texture and color, and the inter-ring dimensions are minimal. The resulting boards of radial cut are practically not subject to deformation, are more wear-resistant and give a lower percentage of shrinkage.
Longitudinal sawing of wood performed by machines or at a sawmill. With this processing of raw materials, veneer, carriage, edged and irregular board, thin gauge, ordinary timber. Used trunks of small dimensions, thin logs.
Tangential sawing- this is the processing of the material, in which the cut plane passes at a distance from the core tangentially to the annual rings of the trunk. Such a product has a pronounced texture, and the pattern of annual rings is wavy. Such sawing has a higher shrinkage coefficient, but the price is more affordable than that of radial sawing.

Home sawing and planing of wood – manual way wood processing. With the help of it, single copies of products are made and decorative items of artistic value.

Sawing frozen wood

This type of sawing is not accidentally singled out as a separate category, since the processing of this type of raw material is quite common, but quality characteristics significantly different from conventional dry and fresh raw materials. Cutting areas are often developed during the cold season, so the flow of frozen wood to processing points practically does not dry out.

Manufacturers cutting tool produce saws specifically for work in winter conditions, respectively, and the equipment on which sawing is carried out must be configured for frozen raw materials. The fact is that such sawing of wood (the price and terms are specified separately) has other physical and mechanical properties than usual. Freezing moisture affects the increase in the strength of frozen trunks, therefore, the design of the cutting tool must correspond to the processing mode. There may be a decrease in the productivity of machines, but the resulting material is more durable, so the improvement of processing mechanisms is the only solution to the problem.

"Treemaker" offers services such as sawing up of wood with departure to the customer. This is very convenient way, allowing you to solve your problems without even leaving your site. We can also buy and export firewood, taking up space near your home. You make a profit and get rid of unnecessary wood. In addition, our specialists can carry out any work on removing unnecessary trees, as well as trimming and trimming dangerous elements with the involvement of special equipment. All equipment that our specialists work with is certified and adjusted, and our employees are provided with a license for their services. Turning to our company, you will receive first of all advice and answers to all questions.

sawing wood video

The main products of the sawmill industry are sawn timber. Minor - sawdust and wood chips, which are used for the manufacture of particle boards, fuel pallets, etc.

Types of materials produced at the sawmill

If you follow the “letter” of GOST 18288-77, the materials that are produced at the sawmill include:

1) Lumber

lumber- wood blanks with two plane-parallel layers and certain dimensions fixed in the regulations.

bars- lumber, the width and thickness of which is more than 10 cm, is widely used in the construction of houses, as load-bearing structures, for internal and exterior finish, manufacture of stairs, windows, etc.
bars- sawn timber, in which the width does not exceed twice the thickness. According to the geometric parameters, square and rectangular bars are distinguished. Depending on the length, these lumber is used as floor joists, bases for wall cladding, in the construction of gazebos, bathhouses and other small architectural forms, in furniture production.
Boards- lumber in which the width exceeds the double thickness dimension. Depending on the presence of bark on the side edges, they are divided into edged and unedged. Edged boards are more in demand for the manufacture of furniture, windows, doors, for various finishing works - in a word, where not only the strength qualities of wood are important, but also aesthetic parameters. Unedged material it costs an order of magnitude cheaper, so it is bought either for self-processing into an edged board to reduce the cost of production, or is used in construction as an auxiliary material (for roof lathing, for the manufacture of flooring, etc.).
Sleepers- bars fixed size and molds that are made to support railroad tracks;

2) Blanks

blanks- edged lumber with wane and edges, which are sawn off perpendicular to the layers in whole or in part. These include plates (half cuts of logs) and quarters;

3) Obapol

Lagging- material with an internal sawn and an outer non-sawn (or only partially sawn) layer. Plank obapol - with a half or more sawn convex part, is used for the production of a picket fence and in the construction of formwork, scaffolding, strengthening mine workings;

4) Slab

croaker- the extreme parts of the log remaining during sawing. The croaker differs from both sexes in that certain ratios of thickness, width and minimum length requirements are not established for it. Most often used as an environmentally friendly fuel or for the production of wood chips.

lumber elements

Plast- wide longitudinal surfaces of the sawn log and any side of the lumber square section. The internal layers are those closest to the core of the log, the external ones are the surfaces that are farthest from the core.

edges- narrow surfaces, the processing method of which determines the separation of sawn timber into edged, partially edged and unedged;

Edge- the intersection of adjacent two sides at the lumber;

ends– surfaces perpendicular to the edges.

Classification of lumber by sawing method

Depending on the location of the layers to the annual layers, lumber is divided into:

1) Made by radial sawing

A radial cut is a cut in which the cut passes through the core of the log, at right angles to the rings. At the same time, the surface of the layers turns out to be uniform in texture and color, and the distances between the annual rings are minimal.

Boards made by the radial sawing method have excellent quality indicators (swelling coefficient 0.2%, shrinkage - 0.19%). Therefore, radial sawn timber is in demand for the manufacture of parquet, timber, lining, block-house - finished products have practically no gaps, in comparison with similar products of tangential sawing.

Saw-timber made by the method of radial sawing is the most durable and expensive. They are used in construction, in the production of massive shields and window beams, radial board usually small (30% is already good indicator), and depends on the method that will be chosen for cutting the log. Optimal scheme sawing to obtain radial and semi-radial boards consider the following.

2) Made by tangential sawing

When sawing a log tangentially, the saw passes tangentially to the annual layers of the trunk, without affecting the core of the tree. Such lumber has a wave-like pattern, which clearly shows the patterns of annual rings and a beautiful woody structure.

For tangential boards, the coefficient of shrinkage and swelling is at least twice that of the radial material, so their cost is more affordable, and the quality of the products is lower. For basic building elements such boards are not used - wood can be deformed and the product will “lead”. But, nevertheless, due to the high aesthetic qualities and low price, the demand for tangential wood high - it is used for decorative finishes furniture, doors, building elements.

Sawing lumber- the fundamental process in wood processing. First, we need to recall a few terms that are used in the woodworking industry and which are defined by GOST 18288-87 sawmill production terms and definitions:

Lumber. Materials that have one or more even sides. Depending on the ratio of length to width and the number of parallel sides, timber, bars, boards, obapol and sleepers are distinguished.

bars- thickness less than 100 mm, width does not exceed twice the thickness. This category also includes slats, only their linear dimensions are much smaller.
bar- thickness more than 100 mm, width does not exceed double the thickness.
Boards- the width exceeds two thicknesses, can be trimmed (all four sides are trimmed) or untrimmed ( sides are not cut off).
Sleepers- this is a bar with strictly defined dimensions, used during construction railways, is now rarely used.
Lagging- the more familiar name "croaker", the outer side of the whip, has only one flat surface. Most often used for further processing into wood chips.

sawing wood methods

This is very important factor, the overall yield of lumber and their quality largely depend on the method chosen. Depending on the direction of the cut to the annual rings, there are two ways:

Radial. Most quality lumber, have an excellent structure and high rates of physical strength. The saw moves perpendicular to the annual rings.
Tangential. It gives a much higher yield of lumber, but their quality is somewhat lower. The saw moves parallel to the annual rings or in a tangential direction.

The choice of a particular sawing method depends on the end use of the lumber and the condition of the whip. On the Internet you can find "strange articles" about sawing in a circle and so on. In fact, the vast majority of the whips are in the same position during sawing, as a result, part of the lumber has a tangential cut (about 2/3 of the total), and the rest of the lumber has a radial cut. The top and bottom of the log are cut tangentially, only the middle is sawn radially.

At the request of the customer or taking into account own production the whip can be sawn from the sides, then turned over 90 °, sawing is performed again. As a result, part of the boards is unedged with a tangential cut, and the rest of the boards will be edged with radial cut. Once again, we repeat that the cutting methods are selected in each case separately, taking into account the above factors. Currently, there are three types of sawmills, each with its own advantages and disadvantages. Let's talk about them in more detail.

Frame sawmills

These are the first mechanisms that began to be used for mechanical sawing of wood. Today, in our opinion, undeservedly "out of fashion." Consider objectively their advantages and disadvantages.

To make it clearer, you need to learn about the principles of work. At the frame sawmill vertical position several saws are fixed (from ten or more, it all depends on the size of the frame), the distance between the saws is set once, sawing is carried out by the vertical movement of all saws with the simultaneous feed of the whip.

pros.

You can fully mechanize the whole process
The sawmill is easy to set up and maintain
Performance is at an acceptable level
Saws the entire whip in one pass
All received unedged boards can be cut at the same time and also in one pass
Edged board is of high quality
Time saving

Minuses

It is believed that these sawmills convert a large amount of wood into sawdust. But this is true only for older models. Previously, saws were made from not very high quality steels, the thickness of each saw was up to 3 mm, plus a set of teeth, the cut increased to 5 mm. Today, by reducing the thickness of the saw and the angle of the teeth, the thickness of the cut is significantly reduced. We will compare the thickness of the cut with a band sawmill below, you will find out what their manufacturers are silent about.

Band sawmills

They are considered the most advanced equipment, the most productive, the amount of sawdust is minimal. We will discuss this later, but first we will briefly describe their structure and principle of operation. The cut is made by closed high-speed saws, the thickness of the saws is small, the width of the cut is reduced. Sawing occurs due to the forward / return movement of one saw along the whip. To be honest, we do not notice any special advantages (for the buyer), but there are disadvantages. In order not to be unfounded, we will talk about the intricacies of the cutting process.

Sawmills require a very attentive attitude. Incorrect sharpening of teeth, incorrect tension or choice of cutting speed (all of these parameters are chosen taking into account the type of wood) cause the lumber to get a wavy surface. The height of the waves can reach several centimeters. And such a waviness of even one board negates all the “advantages of a thin cut”. The wave on lumber is a visible defect in processing and reduces the grade of lumber. The classification of wood defects is described in detail in the article of the same name.

These sawmills have a rather low productivity, requiring a lot of physical labor. For example, if your whip has a diameter of 100 cm, then calculate how many back and forth passes you need to make to cut it into boards 2 cm thick, and frame sawmill cut it in one pass. In addition, each sawn board must be manually removed from the sawmill and stored in a separate place. In this case, after each cut, you have to set the level of the saw again. Highly high degree hazards during operation. The risks of injury while working on such a sawmill increase exponentially - this is a break in the saw at high speeds, and the presence of metal objects in the body of the tree (and this does not happen so rarely). Problems with cleaning sawdust. They are scattered along the entire length of the sawmill, it is long and difficult to remove them.

Of course, manufacturers of band sawmills are “shamefully” silent about such “subtleties”. We advise when choosing a sawmill to take into account maximum amount factors: the required volume of lumber, the availability of qualified personnel, the features of lumber and the requirements for their quality. After all, professional workers at the band sawmill produce lumber of the 1st grade in accordance with GOST.

pros.

Relatively inexpensive
Sawing in both horizontal and vertical direction
Large whip thickness, up to 400 mm
Low waste
Purity saw

Minuses

Poor performance
Increased degree of danger
Complex setup
Highly qualified staff
Mandatory "rest time" from 8 to 10 hours
Cleaning

Circular sawmills

Circular saws differ from band and frame (multi-saw) sawmills in the quality of the edges and the parallelism of the face. Lumber produced at a sawmill is rightfully considered the best, but only from the point of view of the consumer. The main factor that makes lumber produced at the sawmill unavailable for consumption is the high price. The high price does not allow to compete in the building materials market, despite the excellent quality of boards and beams produced by this method. This circumstance is connected with three facts affecting the increase in the cost of lumber from a sawmill:

Summarize: when choosing edged lumber, it is necessary to take into account not only the method of sawing lumber, but also the qualifications of the personnel servicing this equipment. Buy lumber good quality you can visit a trusted supplier, having familiarized yourself with the products using the proposed photos on the manufacturer's website or arriving at the warehouse of finished products. The Elka-Palka company is ready to offer its services in accordance with the price lists indicated on our website. We sell only high-quality products of our own production or purchased from trusted suppliers. Mandatory quality control.