Recommendations for sawing and sorting (photo gallery). The work of the band sawmill: sawing logs into boards. Band sawmill Taiga T3 and its features How to cut round wood on a band sawmill

The specification of sawn timber is given in the assignment for the course project.

The specification requires edged sawn timber, a significant part of which is of a certain width. Therefore, a lumber method is chosen for cutting logs. In addition, logs with a diameter of 34, 32, 30, 28, and 26 cm are intended for cutting, which can be sawed using this method. In the lumber specification, the most difficult (basic) assortment is boards 50 mm thick and 275 mm wide. When producing sawn timber of a certain section in accordance with the rules for drawing up deliveries when sawing with squared timber, the thickness of the maximum volume of timber is equal to 0.6-0.8 of the top diameter of the log. Therefore, for the production of sawn timber with a width of 275 mm, sawn timber with a diameter of 34 cm is selected. For logs of the selected diameter, set and calculate No. 1 for sawing sawn timber with a thickness of 50 mm and a width of 275 mm. Simultaneously with the main assortment, they provide for sawing sawn timber with a thickness of 25 and 19 mm.

Table 8.1 shows set # 1 for a board with a cross section of 50275 mm, boards 25 and 19 mm thick from logs with a diameter of 34 cm.

Let us determine the volumes of boards of the main and associated assortment of logs with a diameter of 34 cm with a volume of 94.16 m 3:

The obtained values \u200b\u200bare recorded in the corresponding columns "Plan for cutting logs for sawn timber".

Total timber delivered (m 3). The correctness of filling in the "Plan for cutting logs for sawn timber" is determined by comparing the calculated volumetric output with the actual output by delivery P \u003d 65.41%.

In this example, the task for the production of lumber of the main assortment has been exceeded. The remaining volume of logs can be cut into the following lumber required according to the specification.To fulfill the planned target for the volume of a p / m with a cross section of 50 × 200, we need the following volume of raw materials:

The resulting value is written into the log cutting plan, because raw materials of this diameter remained, we use it to obtain the next main assortment of 50 × 200 mm. and the calculations are repeated.

Similarly, we make calculations for subsequent sections, the results of the calculation are written in table. 8.1.

Timber sawing is a cycle of actions using various technologies aimed at obtaining lumber from round timber suitable for further use in industry The duration and labor input of the process depend on the chosen method of processing round timber, as well as the season.

Tools and equipment

Trunks and large branches are used for production. All material is divided into groups by thickness and presence of bark. Timber processing companies often have workshops near the harvesting site, where machines for the initial processing of wood are installed.

Manual forest debarking

The timber, which has not passed the debarking stage, can be used on the construction of floors or as a ridge bar in the corresponding interior, or as a support device during construction.

Industrial forest debarking

If another use of the tree is planned, then sawing is carried out, at the output giving the following segments:

unedged and semi-edged (rough material from which the foundations of the floor, walls or ceiling are mounted);
edged (designed for fine flooring).

The cutting can be carried out by a field organization that has all necessary tool.

Tree sawing chart

Rational use of the material is ensured by compliance with the cutting chart. This allows you to reduce the cost due to waste, the percentage of which the card can significantly reduce. The tools used and the types of woodworking equipment depend on the volume, desired quality and size of the finished lumber.

Wood sawing machine

The most commonly used circular saw and various machines:

circular due to a circular saw allows you to make precise cuts in various directions. Suitable for both professional and home use, perfectly copes with round timber diameter above average;
chainsaw;
machines for clean bark removal;
sawing on a band sawmill makes it possible to process dense logs, it is considered the most popular, since the output gives high-quality material and a small amount of waste;
disk machine: production of two-edged beams and unedged boards;
the frame sawmill does not need a foundation, the technology with its use allows you to install equipment in close proximity to the cutting site;
fine meter is processed universal machines, the output gives high-quality building materials even from low-grade logs;
sawing round timber at a large woodworking enterprise should be carried out with the largest amount of sawn timber, which differs from the rest in its special quality and exact dimensions. For this purpose, special sawing lines are installed.

On the sawmill, a beam and an edged board are obtained due to the cut of a log up to 7m long and 15-80cm in diameter along the longitudinal line. A circular saw has one or more discs, it processes different timber diameters according to their number.

If at home it is necessary to process a small amount of wood, then you can use a regular chainsaw.

Cut the tree

Before choosing a tool, you need to decide on the type of cut, focusing on the annual rings of the log. There are several types:

radial (along the radius);
tangential (saw cut parallel to one radius, touches the annual rings);
the fibers are parallel to the cut being produced.

Among the cutting methods, the one that is most suitable for a particular case is selected:

Took. Sawing wood in this way is done for deciduous trees with a small trunk thickness, it is considered the simplest processing. Exit: unedged elements and slabs.
If there is another woodworking machine, then it is possible to cut up to 65% of the material for the output of edged boards of the same width. First, a two-edged beam and boards are cut from the sides, and then a certain amount of edged lumber is obtained from the beam.
More specific methods are sector and segment sawing. The number of elements in the first method varies from 4 to 8, and depends on the thickness of the barrel. After dividing, elements are cut from each sector along a tangential or radial line. The second method begins with the exit of the timber from the central part, and boards are sawn from the side segments in the tangential direction.
The circular method is suitable for individual cutting of wood. It is based on turning the log along a longitudinal line by 90 ° after each sawn board. This allows you to monitor the quality of wood and promptly remove the affected areas of the trunk.

Handmade: using a chainsaw

For home cutting of several trunks, it is impractical to purchase a tool, the cost of which is several times higher than the price of finished products. If you have the necessary skill, then it is more efficient and cheaper to do all necessary work an ordinary chainsaw, or chain equipment powered by electricity. Of course, such work requires much more physical costs and time, but the cost of the issue is significantly reduced.

Work on garden plot requires trimming fruit trees, and also it becomes possible to additionally make material for outbuildings without resorting to the services of specialists, so that any zealous owner will prefer to buy a chainsaw. Most often, conifers are harvested for the house, which this tool perfectly copes with cutting. Smooth stems make it easier to mark cut lines, which increases working speed. Professionals, by the way, most often use a chainsaw, since it is more powerful than an electric one and you can use it anywhere, regardless of the presence of power supplies at the site of cutting or cutting.

To work with a chainsaw for cutting logs, you will need such a device as a saw attachment, as well as saw cut guides and base-trunk fasteners. The frame attachment is attached to the tool so that it remains possible to adjust the distance between the chain and the frame itself. This is done to enable the output of finished sawn timber, different in thickness. For the role of a guide, you can take either a profile of the required length, or a flat wooden plank with sufficient rigidity. A special chain is selected for the tool, designed to cut the barrel along. It differs from the others in the teeth, sharpened at a certain angle.

Before starting work, it is necessary not only to prepare all the necessary tools. Regardless of whether a woodworking machine is intended for processing the trunk or hand fixture, the first step is to familiarize yourself with the cut map. This is done in order to minimize the percentage of waste and increase the yield of useful products.

The first thing to worry about when ripping is the uniform density of the finished boards. To do this, a competent sawman directs the tool from the east side of the log to the west, or in the opposite direction. This is due to the higher density of round timber in its northern part than in the southern part.

Then the slab is removed from both sides with a chainsaw so as to obtain a two-edged bar. It, in turn, is sawn in accordance with the cutting pattern chosen at the beginning of the work. The exit gives an unedged board. If there is a certain percentage of defects in the trunk, then a circular cut with a rotation of the trunk at a right angle or 180 ° is possible.

Amount of finished material, cut price

Exit useful material from conifers and hardwood differs in percentage. For lumber obtained from conifers, the following indicators are characteristic:

provided that the operation is carried out by a professional, and a circular sawmill is used, the percentage of finished timber will be the highest (80-85%);
the edged material that the machines produce is on average 55-70%;
unedged board when working with a chainsaw leaves up to 30% waste.

The figures are given without taking into account the finished rejected timber, the amount of which can reach 30%. However, such material goes to products that allow for a certain marriage.

Finished wood products after sawing

Deciduous round timber gives 60% of finished unedged timber and about 40% of edged timber. This is due to the original curvature of the round timber. You can increase the number of products obtained: this will require woodworking machines of various types. A certain kind of device can increase the amount of lumber by 10-20%. For one cube of lumber, you will need about 10 cubes of deciduous round timber. The cost of installing additional equipment will pay off with the cost of the finished wood. Special lines give more volume, but their use is advisable only on a large area. The average price of sawing wood on a conventional sawmill will be about 150-180 rubles per cubic meter of boards.

Sawing map

The cutting chart is a calculation of the optimal amount of finished sawn timber from one log. It can be calculated independently for each specific diameter of the log, or you can use computer program, which greatly facilitates the calculation, and the price of which is quite affordable.

Material yield after cutting wood

Or a regular sawmill guide could be the source. The result is a table that is taken as a basis. The sawmill should always be data-driven to get more lumber of any kind of wood.

In this article we will tell you how to cut logs on a band sawmill. In addition, we will consider what are the criteria for the selection of a particular method of wood processing and how it affects the characteristics of finished sawn timber.

Methods for cutting logs for obtaining various sawn timber have been developed and improved for a long time, since this is the only way to get edged boards, beams and other categories of similar products from a solid tree trunk.

An example of what can be obtained from a regular log

For a long time to this day, methods of wood processing have evolved, and in addition, new, more productive equipment has appeared that allows you to get the necessary lumber quickly and with a minimum amount of production waste.

Features of wood processing

Cutting chart for automated wood processing

Instruction for processing raw materials and obtaining sawn timber consists of a number of technological operations, including longitudinal cutting of logs, trimming of sawn timber and trimming by width, sorting by standard size, sorting by workmanship, drying and storage.

Each of these stages is important in terms of the quality of the finished product. But, it is the cutting that is the most time consuming and crucial stage, during which the main characteristics of the finished sawn timber are formed.

Cutting scheme of common sawn timber

Drawing up a plan for cutting logs into lumber (the choice of a suitable processing method) depends on the type of wood, on the standard sizes of raw materials, on the degree of moisture, on the density and hardness, and on many other factors. Of course, the method of processing raw materials is largely determined based on the level of technical equipment of the enterprise.

Let's consider what equipment is used for industrial wood cutting and what methods are relevant for each category of this equipment.

Equipment for cutting and features of its application

An example of wood processing by group circular saws

The following equipment categories are used for longitudinal cutting of logs:

Single band saws or circular (circular) saws are the traditional solution used for a long time.
The group of gang saws is a more progressive solution that can significantly increase the productivity of raw materials processing without compromising the quality of the finished product.

Let us consider in more detail the features of using the listed categories of equipment

Individual sawing is a method that uses single saws. In this case, only one cut can be obtained in one saw pass. Therefore, the entire tree trunk can be cut in several passes.

Important: The advantage of individual sawing is the independence of each subsequent cut from the previous one.
That is, sawing can be carried out in different planes.
As a result, it becomes possible to more rationally use certain properties of different parts of the log.

At the same time, this method is unproductive, and therefore not suitable for use in large woodworking enterprises.

Group sawing is a technological process in which a group of gang saws is used.
The advantage of this method is that the log is completely cut in one pass. Due to this, time is saved and, as a result, production becomes cheaper. But you need to remember that group cutting is performed in one plane.
To date, the following categories of equipment for group sawing are most common:

narrow-lumen vertical frames, circular saw machines, milling machines (the diameter of the processed raw material is from 14 to 22 cm).
medium lumen vertical frames (diameter from 24 to 48 cm)
wide-lumen vertical frames, double and quadruple band saw units (the diameter of the processed raw material is over 50 cm).

The main ways of longitudinal sawing

It looks like a cutting table for logs on a band sawmill

So, now that we have considered the current methods of processing wood raw materials using special equipment, we will consider the features of the implementation of these methods.

In the modern woodworking industry, the following cutting methods are used:

"Rolling" is a method of sawing logs, in which the planes of the cut are parallel in relation to each other. In accordance with the location of the lumber in the log, the core board or timber is distinguished; central boards, one of the planes of which runs along the longitudinal axis of the log; side boards.

The photo shows a tree trunk installed in a slitting machine

Important: This method of processing wood raw materials is considered the simplest and least laborious.
But you need to consider that ready-made wooden boards unedged, and therefore additionally have to perform a cross-section of the log.

"With bar" - the method allows you to get a bar with two edges. The rest of the log is sawn into unedged side boards and obapol. That is, cutting is performed not in one, but in two passes. Moreover, the type of saws used for the first and second cut differs both in the number of cutting surfaces and in their direction.

Saw band cutting edge

The equipment on which the timber is made is called the first row machine, and the equipment by which the timber is cut into separate boards is called the second row machine.

The "sector" method, during which the log is cut into separate sectors, from which boards are subsequently made.
Sawing by this method is performed in one pass, when the cutting tools go sequentially or in several passes, when initial stage longitudinal sectors are obtained, and at subsequent stages these sectors are divided into sawn timber.
The sector method is relevant for the manufacture of radial and tangential sawn timber. In accordance with the diameter of the log and the required dimensions of the workpiece, sawing is performed only into quarters or into quarters, followed by cutting into smaller sectors.
The disadvantages of this method can be attributed to the labor intensity, since the log cutting map is compiled individually. In addition, the processing of wood raw materials produces a large amount of waste.
The segmental method involves sawing the trunk into longitudinal segments, which, in turn, are cut into boards of the required size.
The segmental breakup method involves the simultaneous production of segments and sawing them into lumber of the required size in one pass
Segment-bar method, in which the side segments are cut out simultaneously, while a two-edged bar is obtained from the middle (central) part.
The method involves cutting in two passes. During the first pass, the log is split into cant and side segments. During the second pass, the segments are divided into smaller boards.
Circular sawing involves processing a log in which the boards are sawed sequentially. During processing, the workpiece rotates around its axis after the next board is sawn off.
Due to the complexity and individual approach, circular sawing on an industrial scale is practically not used.
The aggregate method involves preliminary milling wooden log, after which the resulting bar with square section cut into required amount boards. During the milling process, a large amount of chips is generated, which, in turn, is used to make particle boards or fiberboards.

Features of cross cutting

The most common configuration of miter saws

The cross cut of the log is called facing and is performed with special circular saws. Despite the fact that the price of sawn timber increases due to trimming, this stage is mandatory in the course of industrial wood processing. Cross-cutting is performed at the end of the longitudinal sawing of the log.

Lumber, after drying, often has simple, transverse and wavy curvatures. Such deformations with their own hands are hardly straightened. To reduce the degree of deformation of the sawn timber, trimming is performed, during which part of the wood that has been curved is simply cut off.

Automated line for trimming lumber

To perform these works, a cross-cut machine in the form of a frame with a saw with a bottom position is used. In the course of cross-cutting, technological waste is generated, which can be processed into chips and used for the manufacture of particle boards. The location of the cut is determined in accordance with the type of assortment and taking into account the defects of the processed sawn timber.

Methods for performing cross cutting

Miter saw in an industrial workshop

Currently, domestic and foreign manufacturers produce a wide range of cross-cutting machines.

In accordance with the equipment configuration and the degree of its automation, several facing options can be performed:

Trimming of beams and boards in a stack at a given constant length. This option is used in the manufacture of various joinery (doors, windows, stairs, etc.), laminated veneer lumber and structural elements for wooden housing construction.
Facing boards with different lengths. During this technological process boards are fed to the working tool, where they are automatically measured. Further, the control unit selects the optimal combination of workpieces that can be cut in one pass in accordance with the specified specification.
Facing with removal of defects with variable length of finished products. This complete set of equipment allows you to minimize the amount of knots, rot, age spots and mechanical deformations by cutting off problem areas from the end of the workpiece.
This option is widely used in the manufacture of furniture facadeswhere lamellas can be glued to form a solid board. The choice of such a trimming option allows you to reduce to a minimum the volume of production waste and thus reduce the cost of the finished product.
Facing with removal of defects with fixed standard sizes of finished products. In this case, all workpieces are cut to the same length according to the specification.

Taking into account the peculiarities of the technological process, it should be noted that the products obtained in this way are the most expensive, since a large amount of waste remains.

Output

Now we have a general idea of \u200b\u200bhow and with which equipment industrial wood processing is performed. Do you have questions that require clarification? In this case, we recommend watching the video in this article.

The tree has long been in great demand among humans. Houses were built from it, fortifications were erected. This substance is still in great demand in our time, not only for construction purposes, but also as a decorative material.

There is a huge number of wood products, which are obtained mainly from sawmills. You can purchase such products on the manufacturer's website skvagena.com.ua.

Getting started

The band sawmill is a rather complex mechanism, consisting of several parts:

the frame of the sawmill, on which all its component parts are located;
base for placing the tree in a horizontal position.

In order to start working with this type of sawmill, you first need to:

1 Get acquainted with all the main parts of the mechanism and study how they work.
Learn how to change the saw and start the device.
Get the skills to adjust the location of the tape relative to the horizontal plane. This factor is very important, since the size of the product obtained in the future depends on it.

It is advisable to start work under the supervision of a person who has extensive experience in performing this procedure.

Cutting process

After you have learned how to turn on, configure and change some of the system's nodes, you can start cutting itself. It is very important to understand how best to position the log and how it is attached.

To do this, consult a specialist and let him give you instructions, where you will see all the nuances step by step. Before starting the saw, be sure to check the belt tension and the level of its sharpening.

The quality of the resulting board depends on these parameters. The first few times, make a cut under the supervision of a specialist who will tell you all the nuances, since there are a lot of them and it is difficult to remember them the first time.

When cutting, the saw should enter the tree smoothly and without much pressure, since otherwise this can lead to its breakage. Cut carefully, without sudden movements.

Remember that the quality of products depends on the sharpening and spreading of the teeth of the tape, correct location it on the machine and the location of the log on the frame. When performing such work, it is imperative to follow all safety rules so as not to damage yourself and other workers in the workshop.

Only serviceable products should be used for these purposes, and the sawing process at the very beginning should be controlled by a specialist who will teach you all the tricks. You can watch the progress of the process in this video:

Beams and planks are common materials used in house construction. In the absence of funds for finished materials, you can make them yourself using a chainsaw. Before you cut a log into boards with your own hands, you should learn more about the features of this process.

The advantage of sawing logs with a chainsaw

Sawing into boards can be done with tools such as a chainsaw and accessories designed to make the job easier. When choosing certain products, it is necessary to focus on the volume of the proposed work. Stationary sawmills are expensive and are purchased only if you plan to organize a business to create boards.

The most accessible tool for work is a chainsaw. Such devices have several advantages over electrical ones:

the chainsaw can be used anywhere, regardless of the presence of an electrical network;
the tool is suitable for working in high humidity conditions;
professional chainsaws are significantly superior to electric ones in power;
you can use the chainsaw continuously for an hour.

For sawing logs into boards together with a chainsaw, a special frame is used, which is fixed to the device and allows you to create boards of the same thickness. You also need a device to secure the log in one position. In addition, you will need a guide.

Since household gasoline saws are not designed for heavy loads, it is worth using for sawing logs professional tools... When choosing, you should pay attention to devices with a capacity of more than 7 horsepower. Before work, the fixed frame is adjusted in accordance with the selected width of the boards. To create a frame, you can use the legs from a school desk or metal corners.

Types of working attachments

The choice of attachments for work depends on the volume and type of work being done. The following devices are used with a chainsaw:

drum debarker, which is necessary for removing bark from logs;
lightweight nozzle for sawing logs;
a standard nozzle used for making boards.

Related article: How to lay the cable underground

Rip saw attachment

When using such a nozzle, the sawing occurs in the horizontal direction. It is fixed to the rail using special clips and allows you to create boards of equal thickness. After the work, the boards are dried, and after that they can be used in construction.

Lightweight nozzle

Such devices are often used, but they should only be used in the case when boards are created for fences or sheds. This is due to the fact that the attachment of the nozzle on the tire occurs only on one side.

Lighter

The nozzle for removing bark from logs is applied due to the wedge transmission. Attachment takes place with belts - special pulleys are used for this. It is worth noting that the performance of the nozzle can be changed, since the shaft rotation speed depends on the size of the pulleys.

Features of sawing logs when using a chainsaw

It is quite simple to create additional equipment for sawing logs:

To create a support, a frame is used, which can be created from the legs of a school desk. The most suitable are pipes with a square section of 20 × 20 mm.
When constructing the frame, it is necessary to create 2 clamps, and fix the cross member at one end. This element should have holes for the tie bolts. A shoulder for the tire is created in the middle.
In order to cut a log lengthwise, it is necessary to design a support frame, the width of which should be at least 8 cm in length.
For ease of use, a handle should be welded to the frame.
Before starting work, it is necessary to carefully check whether the frame is securely attached to the tire.

Using a homemade tool is easy enough. Before sawing, you must install 2 trestles - they will be used as a support for the log. In addition, a metal strip or a flat board is prepared, which will serve as a guiding element.

Find out which part of the trunk is cutboards or timber it is possible by the pattern of tree rings, looking at their end, as well as by the number of knots on the boards or beams. The butt part of the trunk is always thicker than the top one and, as a rule, has no branches, that is, it contains better quality wood.

From the middle part of the whip, so-called technological wood raw material is obtained - wood supplied to mechanical (for chipboard production, Fiberboard) or chemical (for example, for hydrolysis production) processing. The remaining butt part of the whip is cut into two or three parts, which are sent to the sawmills.

At sawmills, lumber is produced from logs, sawing them parallel to the longitudinal axis.

Among the sawn timber are distinguished:

timber (more than 100 mm wide and thick)

segmented beams or quarters (obtained from a log cut into quarters)

bars (up to 100 mm thick and no more than double thickness wide)

Boards (up to 100 mm thick, double thickness width)

obapol - lateral parts of the log

slats - thin boards and bars cut off during longitudinal sawing

In addition to the listed main sawn timber, there are also so-called semi-finished products, in particular, grooved and profiled boards, plinths and other molded products

The thickness of the boards emerging from the saw frame is determined by the distance between the saw frame blades

1 - a bar is cut from the heartwood of a log;
2 - when receiving half beams, the log is sawn along the longitudinal axis;
3 - when receiving segment beams, the log is cut crosswise along the longitudinal axis;
4 - for group sawing (wadding), unedged boards are obtained in one pass of a log through the sawmill frame;
5 - with individual sawing with a bar during the first pass through the frame, two-edged bar, slabs and side boards are obtained;
6 - the most difficult is radial sawing of a log, in whichfloorboards with vertical growth rings;
7 - in the second pass, the two-edged bar is turned 90 ° and cut into

Edged boards, separating the side wane from it;
8 - for boards with horizontally located growth rings, the front side is called the side facing the core (core), and the back is the side facing the sapwood (peripheral part of the trunk)

1. The outer layer of bark, which protects the tree from cold and heat, and therefore from intense evaporation of moisture.
2. Through the inner layer of bark (bast), the tree receives the necessary for its development nutrients... As the tree grows, the bast dies off, joining the outer layer of the bark.
3. Between the bast and the wood itself there is a cambium, which ensures the growth of the tree in thickness and the formation of tree rings.
4. Sapwood - external, a layer of active wood, adjacent to the cambium and feeding the tree with moisture. The older inner layers of sapwood gradually recede towards the heart.
5. The inner dead layers of wood, no longer fed by moisture, form a core (core), which, due to its strength, is the supporting and supporting core of the tree

For processing logs on a band sawmill, it is necessary to adhere to the accepted technology. Thus, you can get the maximum amount quality materials - boards and beams. But first, you should familiarize yourself with the basic rules for cutting.

Types of wood cutting

At the first stage, a carriage is formed from a log. For this, cuts are made on both sides of it. In some cases, processing is performed on four sides. The map is pre-drawn band saw a blank, which indicates the dimensions of the components.

The defining parameter when choosing a scheme is the direction of log processing. In particular, the movement of the cutting edge relative to the annual rings. According to this, lumber of various qualities is formed, which has a unique appearance... Not only their aesthetic qualities depend on this, but also the price.

There are the following types of cuts:

tangential. The cut is made tangent to the annual rings. As a result, oblong patterns in the form of arches, rings are formed on the surface;
radial. For its implementation, perpendicular processing along the annual rings is necessary. The feature is the uniform pattern;
transverse. Processing occurs across the fibers, the cut pattern is an even cut of annual rings;
rustic. Can be done at any angle, contains a certain number of knots, sapwood or other similar defects.

Often in the woodworking industry, the waste of the band sawing logs - the slab is used. On the one hand, a flat plane, and the other remains untreated.

To draw up the most accurate cutting it is recommended to use special programs. They take into account not only dimensions source material, but also the type of wood.

Sawing on a sawmill with 180 ° rotation of the log

To form the maximum number of boards, it is recommended to use a technology in which some belt processing processes are rotated by 180 °. This allows you to achieve the maximum amount of lumber with different types cuts.

The principle of processing is to make initial cuts along the edges of the log, which are at an angle of 90 ° relative to each other. They will serve as the basis for further tape cutting. The work is carried out on equipment with a vertical arrangement of cutting elements. The trunk diameter must be at least 26 centimeters.

Phased order of work.

Processing the side with a cut-off edge. This results in two boards.
Turning the workpiece by 90 °. The cut is made from the opposite side. The number of products varies from 3 to 4.
Re-turn 90 °. The main part of the source material is processed. Depending on the planned ones, 7-8 blanks can be obtained.

Despite all their positive traits, this method has one significant drawback - low production speed. It is recommended to use it on equipment that provides a block for automatically changing the position of the log relative to the cutting part of the machine.

A detailed scheme is most often used for the manufacture of rustic boards, which have lower quality requirements.

Sawing on a sawmill with 90 ° rotation of the log

For the production of tangential and radial boards, a different technique is recommended. It consists in systematic belt processing of logs with simultaneous analysis of defects. Thus, you can get products of the required quality.

After delimbing, the workpiece is placed on the feed stand sawing machine... Then you need to do the following.

Removing the primary slab. It is carried out until the base width is 110-115 mm.
Removal of unedged boards about 28 mm thick.
If the number of defects on the surface exceeds the required level, the material is rotated 90 °. With a sufficiently high quality of the board, the next one is cut.
Repetition of the operation.

A similar technique is applicable for processing installations that have one cutting surface or have the function of temporarily dismantling the rest.

With a sufficiently large number of defects, it is possible not to put the workpiece aside, but to process it by turning it through 180 °.

The above banding technique can be applied to create any configuration of wood products. Often, the core area is used to form the timber, and the remaining parts are used to make the boards. But there may be exceptions - it all depends on the required shape of the blanks.

The quality of work is affected by the current state of the sawmill, the level of sharpening of saws and the processing speed. These factors must be considered before starting production process... If necessary, the equipment is prevented or repaired.

The video material shows the method of sawing logs on a homemade band sawmill: