What is the significance of the curvature of a log when sawing ungraded wood on a multi-rip machine?
Why does a thread-like strip form on its surface when rounding a log?
Why is the Kedr rounding machine cheaper? Question from Boris from Krasnoyarsk.
I bought a rounding machine that looks the same as OTSS-1M. Is it possible to buy a new cutter for it?
There is a need to purchase a laser cut indicator for a sawmill. Will your laser work in such conditions of -40C? What is the line length of a line laser?
Hello! Do you have machines for sale for rounding logs, where the natural consistency of the log is preserved? We build houses manual cutting. You have to cut and chop by hand, but I would like to try to get a similar result using a machine. Best regards, Evgeniy.
Hello, we purchased an OS1-400 machine from the Izhkomstanko company, started production and came across one very interesting point, the essence of the question is whether it is necessary to make a raw round log larger in diameter by about half a cm, so that when it dries, we get required diameter? And does a dry log absorb moisture after assembly? If it absorbs, does the part increase in diameter? Or not? Thank you very much in advance for your help.
How to set knives on the OS1-400 cylinder machine?
How do you solve the log vibration problem?
Tell me, how do Svyatogor and Sherwood machines differ from Pilteh machines?
Why does a wave form when sawing on a band sawmill?
What is the difference between the OTS-4A rounding machine and the OTS-2A?
... I recently learned that the yield on circular sawmills is much more than 78-80 percent, after I also read about it on the Internet, is it true? After all, on disc wheels the thickness of the cut is greater, so why is the output so large?
How to check the geometry of a band sawmill?
What is better to specialize in production: only cylindering of logs, production of house kits, production and assembly of houses from cylindered logs?
How does the height of a wall made of rounded logs depend on the width of the mounting groove?
The principle of processing the surface of a log during rounding.
How to join a cross-cutting machine and a cup cutting machine in a line?
What to do if instead of a cylindrical log you get a cone (carrot)? The difference in the butt and apex reaches 5 mm.
How long does it take to round one log, what is the real productivity?
Why does the conveyor belt move to the side?
What are the types of rounding machines?
What is the difference between the OTS-2A rounding machine and the OTS-3A?
How to make a rounding machine with your own hands? I don’t see anything complicated except the rounding cutter. Is it possible to order from you a cutter for a rounding machine and a cutter for a cup cutter with a diameter of 220 mm?
The complete set of the OTS-3A rounding machine, what else will be needed to organize the production and assembly of houses from rounded logs?
What is the difference between houses made from rounded logs and those assembled from hand-cut logs?
Is it possible to additionally order a milling cutter for the OTS-1 rounding machine?
Is it possible to purchase your machine on credit or lease?
Where can I see your equipment in action?
I saw your machine in our region.
But I can’t find it in the photo on your Pilteh website?
Can I pick up the OTS-2A machine in my car?
Interested in corner disc sawmill. Deadlines?
I want to order a machine with certain parameters.
To cut off the required part wooden board or make a product required thickness, special units will be required. In order to make a cut, you need circular saws. With their help, you can quickly cut the desired piece from a board or log. To calibrate the product you will need thickness planer. Thanks to it, you can make wooden part required thickness with accuracy literally down to the millimeter.
Circular saws are different. Nowadays, manual and stationary units are produced that are designed to work with various types of wood products. This equipment is a powerful electric tool, the main part of which is a durable disk with very sharp teeth. Such a unit will easily cut boards, laminate, slats, wood boards. It's even suitable for cutting metal.
There are circular saws different models. Therefore they specifications may vary. To choose the power tool you really need for production, you should familiarize yourself with the following characteristics of the equipment when purchasing:
- depth of cut.
One of the most important indicators of the unit. It depends on the diameter of the disk. The larger its size, the deeper the cut will be;
- engine power too important indicator. It affects the speed of the equipment. The more powerful the unit, the more productive it will be. Circular saws used in production can have a power of 2500 W. This is a very high figure;
- equipment safety. Since circular saws will be constantly used by workers at a woodworking enterprise, they must be completely safe to use. Therefore, you need to choose units with a protection system, a lock that prevents their accidental activation.
To calibrate wood blanks, a thickness planer is required. Most often it is used on furniture production, since manufacturers of interior items require professional equipment that would allow them to produce neat and beautiful products. When choosing a thickness planer, you need to pay attention to its technical capabilities:
- how often the shaft rotates. The faster it rotates, the smoother the surface of the workpiece will be;
- depth and width of the cut made by the thickness planer. Depth is an indicator that means how much wood the unit can cut in one pass.
- Width – what width of parts the machine can process.
What is a rounded log and what is it used for?
It is customary to call a rounded log a log from which it is cut on a special woodworking machine. upper layer wood As a result of this processing, the diameter along the entire length of the log will be the same, i.e., a cylinder is obtained from a cone-shaped tree trunk.
Houses made of rounded logs look not just beautiful, but elegant. They are warm, durable, and, most importantly, environmentally friendly. Ordering a house made of rounded logs on the website http://stroi-terem.ru/category/houses-made-of-rounded-logs/ will not cause any difficulties. By going to the website you can find out prices, deadlines for completing work, delivery options, and much more. etc.
Logs are manufactured according to GOST 9463-88.
The nominal length of such logs should be from 3.5 to 6.5 m in increments of 250 mm. Thus, a total of 13 standard sizes are possible. Deviation from the obtained length is allowed from + 30 to + 100 mm.
For construction, rounded logs having a certain diameter are usually used. The standard defines the smallest log diameter as 140 mm. Most manufacturers set this diameter from the specified size in steps of 20 mm. Usually the row ends with 280 or 300 mm logs.
But since only for some manufacturers state standard- this is a mandatory document, then both the length of the logs and their diameter, at the request of the customer, can be made to any size that will correspond to the design dimensions of the future building.
To lay a rounded log in a log house, a longitudinal groove called a laying groove is cut on one side of it. Its width should be greater than the radius of the log and the shape should correspond as closely as possible to the lower log. Those. the radius of this groove should be equal to the radius of the log.
Typically, rounded logs are made from “raw” wood and are dried to the required condition already as part of the log house. Very often the drying process is uneven - when the inner layers remain wet, but the outer ones dry out quickly. Stresses arise in them, which cause longitudinal cracking of the logs. In the zone longitudinal groove stresses are relieved by removing the laying groove. And on the side of the log opposite to the groove, the tension is relieved with a longitudinal cut several millimeters wide and a depth of approximately 0.05 - 0.1 of the diameter of the log. It is called a relief or compensation groove.
How do machines for rounding logs work?
Such a machine can be positional or through-type. In the first case, the axis of rotation of the log is stationary, and the log rotates at a frequency of 20 to 60 rpm. Steel roughing and finishing cutters move along the log with a rotation speed of 3,000 - 4,000 rpm. Roughing consists of first removing a layer of bark and wood until a given diameter is obtained, with an allowance for finishing. Then it is cut off with a finishing cutter at high rotation speed. thin layer wood, and get a finishing surface.
In pass-through machines, the processed log is fed by toothed rollers into a stationary rounding rotor, from which it emerges fully processed with compensation and stacking grooves.
- Machine tools positional type are divided into turning and rotary cylinder machines.
- Turning cylinders are big lathe with length wooden blank up to 7 or more meters and a diameter of unprocessed logs up to 500 mm or more. The rounding rotor contains a rotating cutter, which produces rounding on the forward pass, and on the reverse pass, laying and compensation grooves are cut.
Theoretically, a simplified model of such a machine can be made at home, but working on it will be quite dangerous. The large mass of the rotating log, high speeds of the processing cutter and sufficiently large energy capacities are almost impossible to implement in the garage or shed of a private house.
It’s easier and cheaper to buy a batch of ready-made rounded logs and build a house or bathhouse from them.
How to make a stool from a log with your own hands / Wood crafts / Furniture Master's Secret
How to make a stool from a log with your own hands. Wood crafts. Furniture Secret of the Master. Sekretmastera shows how to make a stool with your own hands using fire...Details here?p=12984
Shown is a method for making a unique wooden stool, which you can’t buy in a store. It turns out light and robust design round shape and with soft seat. Furniture for the garden.
Convenient for a summer residence. Furniture Master's Secret!
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Rounding machine used for wood processing - cylindering, cutting grooves and bowls of crown logs, plane milling. The use of equipment allows you to assemble a log house without additional processing details. Operations are carried out during one installation of the workpiece.
Design features of the machine
The operation of the equipment is similar to that of semi-automatic lathes equipped with a milling head. Automation is provided within a cycle - one approach, during the implementation of which the equipment performs an operation according to specified parameters. To change actions and control cutting tool operator participation is required.
The design of the machine has the following components:
- Supports and rail track.
- Rail equipment - lifting and moving mechanisms.
- Drive and supply of cutting tools.
- Headstock and tailstock.
- Stands and strings for connecting electrical cables.
- Push button post.
The working tools are finishing and spherical cutters. The equipment uses finishing cutters of 2 diameters:
- 150 mm. The output size of the product is 160-190 mm.
- 190 mm. The achievable size is 200-240 mm.
The cutting surface of the finishing cutter lies in one plane.
By adjusting the blades of the spherical cutter, the size of the groove is determined. Equipment operation is ensured asynchronous motors, one of which (front) is responsible for feeding the cutter, the second (rear) ensures rotation of the workpiece.
Operating parameters when processing wood depend on the type of species, the state of humidity and freezing of the material, and the thickness of the workpiece. The speed of rotation of the log and the feed of the cutter are subject to adjustment.
Operating principle of the equipment
Processing of wood workpieces is carried out by moving the drive and feeding finishing or spherical cutters along the log installed on the rail track. Innings cutting element is done manually. A finishing cutter is used for longitudinal cutting of material; the spherical shape of the tool is used for milling crown cups.
The wood workpiece is given rotation or rigid fixed fixation. The position depends on the type of operation. Static fixation is applied to cup selections and compensation cuts. Rotational movements are imparted to the log only when the workpiece is cylindered simultaneously with rigid fasteners.
The mechanism of action of the machine is built on:
- rotational or stationary state log preparations;
- progressive and rotational movement cutters.
When cylindering, the accuracy of a given size is achieved and the curvature of the product is eliminated. The workpiece is processed according to the axis of the product, taking into account the following features:
- The workpiece is installed with the butt (thickened part) to the headstock to prevent extreme layer removal.
- The translational movements of the cutter are carried out in the direction from the front to the tailstock.
The accuracy of log cylindering is ensured by the rigid fixation of the front and rear headstocks and the alignment of the fasteners. Obtaining the required product size is achieved in several approaches.
Cylinder operation
In cylindering operations, constant rotation of the workpiece, fixed in the centers of the headstocks, and the cutter, which is moved along the length of the log, is specified. The workpiece is placed on lever lifts from the headstock to the tailstock. Before work begins, the rack is brought to the headstock.
During the work process the following operations are performed:
- bringing the workpiece close to the headstock;
- installing the workpiece in the centers of the headstock and tailstock in the form of a rigid fastener by adjusting the rear clamp screws;
- parameter problem milling head for roughing minimum material removal;
- sequential start of workpiece and cutter rotation drives;
- manual movement of the cutter using a rack;
At the end of the pass, the rotation of the workpiece (drive) stops to bring the rack to its original position and set new cutting parameters. Operations are resumed in a similar manner.
Mounting groove selection operation
Mounting groove - a longitudinal notch on the workpiece that simplifies the mating of logs during installation finished products. The difference between the grooving operation and cylindering is the processing of the workpiece in a fixed position. Sampling operations are carried out in the following order:
- moving the rack to the position of the headstock;
- installation of logs in the centers of the headstocks with fixation against rotation;
- adjusting the horizontal position of the cutter to the processed surface of the log;
- the task of cutter parameters in an amount smaller than the diameter of the workpiece;
- turning on the cutter drive;
- sampling by manual translational movement of a moving cutter using the rack handle.
The groove parameters (depth, width) after excavation are unchanged throughout the entire length of the log.
Operation of selecting crown cups
The presence of crown cups facilitates the installation of the structure. Their creation is carried out after cylindering and cutting out the groove. Milling cups requires following the following order:
- fixing the workpiece on the rails using a brake;
- applying a graphic mark on the cup;
- alignment of the center of the cutter and the planned excavation;
- turning on the drive of the working tool;
- directly removing the material by moving the cutter downwards by the handle.
Before carrying out the excavation, the task of extending the cutter knives, set to a single radius, is required. When working with spherical cutters, the positions of the knives are checked at least 2 times per shift and before starting to operate the equipment.
Installation of equipment
The reliability and performance of the machine is ensured by technically competent installation. Installation of equipment is carried out taking into account the mandatory requirements:
- To install the machine, parallel beams or a concrete base are used without pouring the rails. The place is protected by a canopy from precipitation.
- Equipment power supply according to technical specifications. Switching on to the operating mode is allowed after checking the phase and ensuring grounding.
- Balancing rail tracks by level in horizontal and vertical directions.
- Ensuring the alignment of the rear and front headstocks.
High labor organization is achieved by zoning the site with the creation of storage areas for blanks, finished products and lumber. Before starting work, the condition of the surface, cutters, drive belts must be checked and the working units are lubricated.
Rounding machines are the main components of wood processing lines, which are applicable both in standard workshops and in manufacturing similar products with your own hands. The main function of this machine is due to the cutter with complex design And different types remove the smooth top layer from each log.
Currently, there are a huge number of similar products of various types and purposes on sale, among which it is not at all difficult to choose the equipment that is ideal for your case.
1 Galvanizing machine - equipment features
A machine for rounding logs is a mechanism in which the processing of logs is carried out through the contact of several special cutters with them. The latter are driven by a special motor (in some configurations there are two of them).
All logs are securely fixed by the system during feeding, making their simple and uniform processing possible.
Also, depending on the type of equipment, it may also have a rail track, the installation of which for the walk-through version requires a special concrete base for installation.
On sale presented different kinds rounding machines, including equipment of the Rus and Sherwood type, pass-through type, as well as modular type.
This equipment, like Sherwood or Rus devices, can be independent units or be part of a woodworking complex. They come in different capacities.
The average volume of logs that the Rus, Termit, and Sherwood machines can freely pass through is 240 mm, although some versions of such equipment can easily handle larger samples.
Round - milling machine Sherwood OF-28TS
Rounding plants allow you to perform a range of types of material processing. In particular, it is used to directly round logs, prepare a longitudinal laying groove, a compensation cut, as well as specialized elements for fastening - side bowls.
This is suitable equipment for everyone without exception varieties of material,
including popular beech, oak, birch, ash, pear, alder, pine and other types of wood.
1.1 Pros and cons of this processing technology
The advantages of this type of machines for processing logs include:
- High speed of product processing.
- Precision in many types of processing thanks to the variety of knife sharpening.
- Absolute operator safety when working with such equipment.
- Simplicity in tinctures, high level automation of such devices.
- High quality of material processing, regardless of the quality of the wood processed
- Versatility - with this device you can make any workpiece from natural wood.
- Low wood consumption, which is provided not only by the Rus and Sherwood samples, but also by a homemade rounding machine.
As for the disadvantages inherent in this type of device, among them it should be noted:
- large dimensions of the equipment, due to which those who like to process wood with their own hands cannot always install similar designs in your own home;
- high prices for replacement parts, as well as necessary processing products before starting work, for example, sharpening knives.
1.2 Replacement parts for rounding machines
For simple processing of logs on such machines various types without changing the finishing quality of the material for such structures It is necessary to purchase the following types of components:
- Replaceable cutters, especially non-standard types (when purchasing these components, special attention should be paid to the quality of sharpening of knives under individual species timber).
- Additional electromechanical drives for some design types.
- Replacement parts for processing bowls.
- Parts for making compensation cuts.
Also sometimes for this type of equipment, including Sherwood and Rus machines, you can buy special types sharpening knives for individual logs, as well as some flexible replacement elements. You can replace them yourself. The list of such for each device is individual.
2 Popular types of rounding machine
Currently, there are several popular varieties of such equipment used by professionals, as well as DIY enthusiasts to carry out construction, repair, Finishing work in the house.
Among these models:
- Rounding machine Altai. The equipment, thanks to its knife sharpening features, allows you to process logs with a diameter of up to 550 mm. Equipped with spherical and end-type cutters. The main advantages of this version when processing logs: the ability to select the optimal speed of the device throughput, as well as adjust the depth of penetration of the knives. Ideal for all types of production, like Sherwood, including the construction of small wooden houses.
- Rounding machine Kedr. Another type of pass-through type equipment For industrial enterprises. Allows you to lay up to 7.5 meters of logs per processing. Suitable for all types of logs thanks to unique look sharpening cutters.
- Rounding machine Taiga OS 1. The equipment, like Sherwood, is suitable for roughing and finishing types of wood processing. Allows you to work with samples with a maximum diameter of 240 mm. Like other examples of the walk-through type, it can be used for industrial purposes, including the construction of a house or bathhouse from timber. Depending on the type of knife sharpening, it can be used for various tasks.
- Rounding machine Termit. Universal equipment pass-through type, like the Rus machine, suitable for processing various types of timber. Ideal for industrial enterprises where it can receive up to 900 linear meters finished timber per shift. Modern design This equipment eliminates the possibility of the log turning during processing.
All types of this equipment are most suitable for industrial production of timber, however, if there is proper conditions For DIY work, they can be used at home.
The cost of such products, as well as the Rus or Sherwood models, depends on the equipment configuration, as well as a company selling this type equipment. The best prices for it from official dealers.
For those for whom such products are not suitable technical parameters, you can make a homemade rounding machine, created according to existing equipment sketches.
2.1 The process of rounding logs on a machine (video)
During construction wooden house Usually pine or spruce is used. In a properly arranged wooden house, in any frost it will be warm, since when teaching a log house, insulation is placed inside each seam. Thanks to the tight fit of the logs to each other, the heat in the house is maintained in any frost. This technology was developed by our distant ancestors and has survived to this day. Only the materials used to make the log house have changed. Previously, they used sanded logs from felled trees. But such logs had different diameters at the butt and top, so even though the butt and top alternated, the thickness of the crowns still remained different. Therefore, the grooves and elements of the locks came out different; they had to be cut out locally, which increased labor intensity and reduced appearance walls In addition, the gaps between the logs remained large and had to be carefully filled in.
Nowadays such logs are rarely used, where the forest is closer to the timber processing plant. For a modern wooden individual residential building, new types of lumber are used: rounded logs and laminated veneer lumber.
People have worked with wood for a very long time. Since then, the use of this raw material has only gained momentum. Currently, there are entire facilities dedicated to wood processing. However, skillful owners can assemble some devices themselves if they need to large quantities process wood. Enough useful device became a rounding machine.
Purpose of the equipment
The main purpose of this machine is that it is used to give the correct shape to those logs that are used for the construction of log houses. Naturally, harvesting can be done manually, but the use of an automated device significantly speeds up and facilitates the entire process.
The rounding machine has the following number of functions:
- prepares grooves in logs for further installation;
- carries out rounding of the material;
- used for production edged boards from the gun carriage;
- you can prepare dies for parquet;
- smooth wood can be milled;
- pruning unedged boards;
- production of timber of the required sizes.
In addition, this equipment can create expansion grooves using circular saw, and the raw material processing speed is customizable.
What does the unit consist of?
The rounding machine includes several of the following components:
- A metal frame, which is most often made from rectangular-type pipes.
- Necessary guides for moving the power and sawing device.
- Headstocks used for fastening and torsion of logs. The headstock must be equipped with something that secures the barrel. The spindle head will also be mounted there.
- The milling cutter for rounding machines is one of the key elements. If the cutter is of a figured type, then it can be used to make a groove for mounting, but if it is universal, then it can be used for rounding, cutting crown cups, and processing planes.
- An important element There will also be removable knives for the cutter. They must be made of good steel. The main convenience is that they can be replaced without removing the cutter itself.
Types of units
Today there are several types of rounding machines.
Pass-through type machines ensure constant movement of the workpiece on the table, processing it at the same time. There are also cyclic type machines, in which movement and processing occurs in several cycles. In addition, this one is divided into two more - these are cyclo-pass and cyclo-positional. In the first case, the wood workpiece remains stationary, and the cutter moves; in the second case, on the contrary, the processing tool does not move, the wood moves.
It is also worth noting here that the division of machines is also carried out according to the level of their automation. There are mechanical, automatic and semi-automatic machines. If used mechanical type machine, then loading the material and setting up all processes is carried out by the operator. In automatic machines, all this happens without human intervention; you just need to control the progress of the work. Semi-automatic machines are capable of controlling only one stage of work; then operator intervention will be required.
A small comparison of classes
Continuous type rounding machines are distinguished by their high performance, however, they also have a certain error during operation, and the surface may remain slightly rough.
Units belonging to the cyclic type process the surface much better, and also perform other operations, but this significantly affects productivity.
However, it is worth noting here that it is the second category of devices that has become more widely used. Since they are more compact, and their base is considered more stable.
Most simple option Assembling such a device with your own hands will use a sawmill as a base. Instead of the front cone of the equipment, it is necessary to install a stop. The bearing for this part will be equipped with the headstock, which is located at the rear. In order to rotate the workpiece, you can use an electric motor or a handle.
The greatest difficulty is the manufacture of a cutter, and therefore they try to assemble it from several individual elements. It is very important that the material used for this part must be very durable. To move the cutter, an additional rail is used, which also needs to be installed. The final device is very similar to a conventional one. The workpiece is placed in the grooves and rotated, and the cutter moves along. Rounding machines work in the same way.
Assembly steps
The first step is to assemble the frame. The installation height of the frame is 20 cm. The tilt error is allowed in the region of 0.5 mm per 1 meter. The second step is installing the power mechanism, as well as attaching the headstocks. Next, you need to secure the cable for the electrical cable to the installed racks. After this, you can begin attaching the stopper to the power mechanism. An important part of the job will be the grounding equipment for the device if it uses an electric motor. Only after the grounding has been arranged can you begin to connect the motor to the power supply. When this is ready, it is necessary to check the compliance of the phases with the operating modes. If they were connected incorrectly, then when the motor is turned on, reverse rotation will occur. If this happens, then the phases need to be swapped. When everything is ready, you should check again for correct rotation. Lay down the log before all have been successfully completed testing work, is strictly prohibited.
Special attention it is necessary to pay attention to the fastenings of the headstocks. They are installed as rigidly as possible and parallel to the guides. The axes of both elements must coincide. It is also important to balance the cutter, otherwise the machine will quickly fail.
All photos from the article
The construction of wooden housing in our great power has been developed since ancient times. First of all, this is caused by colossal reserves of this environmentally friendly and relatively inexpensive material. Despite the emergence of many new construction technologies, classic log houses still remain popular. After all, the advantages of rounded logs are obvious, and they will be discussed further.
Why exactly a log?
First, let's find out what a rounded log is and why the vast majority of people prefer to build housing from it.
Important: speaking in the dry language of definitions, a rounded log is usually called a straight tree trunk, pre-processed on woodworking machines to give it the correct cylindrical shape.
As a result, the top uneven layer and knots are removed, and compensation and mounting grooves are applied.
Advantages of the material
- Wood itself has a natural porous structure, making it one of the best warmth and sound insulators.
- Having clear geometric dimensions, this material fits perfectly together. Specially designed grooves ensure high tightness and quality of inter-crown seams.
- All trunks have a clearly fixed diameter, the maximum deviation here can be no more than 2 mm. This makes it possible to choose wood for the construction of premises for various purposes with specified characteristics.
- At the moment, there is simply no building material that is more environmentally friendly and beneficial for people. Unlike wood, traditional brick or modern views building materials can only boast of environmental neutrality.
- Although the price of rounded logs may be higher than that of many competitors, such houses do not require additional internal and external cladding. This material itself has natural beauty, as a result of which owners save significantly on finishing.
- Modern woodworking equipment makes it possible to initially produce trunks with ready-made connecting elements. This significantly speeds up the construction process and gives a lot of layout options.
- You may have already heard that natural wood breathes. This refers to the array's ability to take out of thin air excess moisture and give it back when conditions change. Simply put, wood is a natural air conditioner, providing an ideal microclimate for human life in the house.
- And finally, the construction instructions are quite accessible. A simple bathhouse, barn or small country house, a good owner, with a strong desire, will be able to build it with his own hands.
What are the disadvantages
- As we have already said, wood is a living material, so over time the wood begins to dry out and crack. This is true, but thanks to modern technologies, such processes can be significantly slowed down.
- Many people know that during the process of growth, a tree trunk slightly twists in a spiral. After the cut, this spiral sometimes begins to unwind. This is why craftsmen do not recommend building from freshly cut timber; the structure may fail. But a dry rounded log does not have this drawback.
- Disadvantages such as high fire hazard and susceptibility to biological pests are easily eliminated using the same specialized impregnations.
- Perhaps the only significant drawback of any wooden structure is a high percentage of shrinkage of new houses. Well-dried, high-quality wood shrinks up to 100 mm for every 3 - 4 m of wall in the first year. And 10 - 20 mm each for another 2 - 3 years. Freshly cut timber will take up to 10 years to shrink.
What affects performance
To determine the basic parameters of the material, there is a set of regulations. In our country this is GOST 2708-75, in the west ISO 4480-83. There is no big difference between them, the main parameters are identical. It is on this data that a program such as a calculator for rounded logs of volume, weight, density and other characteristics is based.