Any construction or major repairs are unlikely to do without boards and various bars. In this case, all this material must be cut to the desired size.
Of course you can buy finished boards or bars. But this will require great financial costs. Therefore, many home craftsmen and professionals prefer to do everything themselves.
And for this it is necessary right tool such as a band saw. And in this case, you should not immediately run to the store to buy a machine.
If you have a little experience, then you will definitely get a homemade band saw. And the technology of its manufacture will be discussed in this article.
Preparatory stage
A do-it-yourself band saw will cost less than its factory version. But in order to make everything right, you should first deal with the design itself. The band saw is designed for sawing wooden blanks. large diameter. As a rule, with its help, boards or bars are made from logs.
The design itself is a frame on which the electric motor and pulleys are mounted. The first is necessary for the rotation of the pulleys on which the cutting blade is fixed. It is with its help that the workpiece is cut.
Before starting work on creating a band saw for wood, it is worth making a drawing. With it, all further work will be faster and clearer for you.
1 - lower drive pulley; 2 - bed; 3 - band saw; 4 - V-belt A710; 5 - damper; 6 - guide; 7 - carrier rod; 8 - upper drive pulley; 9 - table, 10 - electric motor (AOL-22-2); 11 - belt drive pulleys; 12 - bracket; 13 - nut M12, 14 - upper support; 15 - adjusting screw; 16 - slider
- metal corners, profile pipes, channel bars and rolled products;
- electric motor;
- pulleys from old agricultural machinery. Best suited are those that have a diameter of 30 centimeters;
- sheets of plywood or chipboard to create a cabinet;
- the cutting blade itself;
- welding machine and metalwork tool
You must first make a frame (according to the previously drawn up drawing). It is made from a channel (100) by welding. The height of the frame should be about one and a half meters. It is also desirable to make a box under the frame, chips will be collected in it. This design is easy to make from sheets of plywood or chipboard.
carrier bar
Upper belt drive pulley
The damper is necessary to dampen the oscillations of the tape. Made from textolite.
1 - base, 2 - M6 bolt (2 pcs.), 3 - strap, 4 - nut with washer
The guide is used for the correct supply of workpieces
A homemade band saw consists of several basic elements. First of all, it's a frame. It is on it that the rest of the components will be attached. An electric motor is mounted on the frame, which is connected to the pulley. You also need to make a device for feeding a log (or other wooden blank) for cutting.
Let's move on to the pulleys. They are used in the design of two pieces. In this case, the right pulley will be driven, so it does not require rigid fixation. It must be equipped with a spring, which is responsible for the tension of the web. The left pulley, which is the leading one, is fixed rigidly in its place.
The pulleys themselves are mounted on special guides made of pipes. In this case, it is necessary to provide for their fixation with bolts. The pulleys must be sharpened so that the edges of the tape protrude a couple of centimeters. Also, the cutting blade itself is installed with a slight slope. In this case, it will stretch itself, which will prevent the tape from falling off during the operation of the machine.
Belt tension mechanism: 14 - upper support, 15 - adjusting screw, 16 - slider, 17 - cover, 18 - M4 screw, 19 - bearing 60203, 20 - gland seal, 21 - end washer, 22 - Grover's washer
Saw band attachment unit (lower pulley)
1 - lower belt drive pulley, 4 - V-belt, 7 - carrier rod, 11 - belt drive pulleys, 19 - bearing 60203, 23 - washer, 24 - M6 locking bolt, 25 - spacer bushing, 26 - axle box housing, 27 - axle box cover, 28 - shaft.
Box for the tape machine
Drive shaft of the tape machine
After preparation, all parts are mounted on the frame. The pulleys are connected to the electric motor using a belt drive (can be mounted chain drive). Next, the power buttons are installed and the manual band saw for wood is ready for use.
A very important element of such a machine is the cutting blade. Some craftsmen make a saw with their own hands. To do this, you can purchase special blanks from steel strips. Further, using templates, sharpening is done.
Place of soldering
Blanks are produced in the form of strips, and a “ring” is needed for the machine. For this, the workpieces are welded. In doing so, it is necessary to apply complex method. The fact is that the overlap should not work out. The connection of the strip into a single ring is done end-to-end. After welding, the joint is carefully polished.
Such complexity of manufacturing a cutting blade forces many to buy ready-made saws. Today, there are a wide range of such products in stores. The main thing is to choose the size of the cutting blade so that it fits your pulleys.
In addition, when choosing a saw, you should pay attention to the thickness. The larger this indicator, the greater the radius of curvature of the web. For a more accurate selection, you can use special tables.
A DIY band saw can quickly recoup the time and money spent on its production. But this will be true if you follow the recommendations for the operation of such equipment. Experts give such advice:
the cutting blade must be properly tensioned. The magnitude of this tension will depend on the grade of steel used in the manufacture of the saw, as well as its width. This indicator can be measured using special device- "Tyrzometer";
do not think that the saw will be able to work continuously long time. Experts recommend the following mode of operation - two hours of sawing, then the canvas is removed and hung out in a free state for 12-24 hours. In this way, you can extend the life of the saw;
always use a lubricant, especially if you are sawing fresh wood. Freshly felled trees produce abundant resin. Its mass begins to clog the incisors. As a result, the saw begins to warm up and quickly fails. For lubrication (and simultaneous cooling), you can use plain water with the addition of a simple detergent. AT winter period experts recommend using a mixture of diesel fuel and engine oil;
Loosen the cutting blade after finishing work. When cut, it heats up and expands a little. After the end of work, the canvas begins to cool and decrease in size. If you leave it in a taut state, then marks from the pulleys will form, in place of which scuffs will subsequently turn out;
follow the rules for sharpening teeth. Both the speed of the work itself and the service life of the cutting blade will depend on this. Also, make sure that the teeth are always well sharpened and their correct divorce is observed.
It is also necessary to strictly observe safety precautions. A band saw is a rather traumatic piece of equipment. It is best to equip it with a protective cover. Such an addition will increase the safety of work, and help to improve the removal of sawdust.
Also, carefully consider the choice of the installation location of the machine. Of course, a homemade band saw does not take up much space. But still, there should be enough space around for free movement.
Also, take care of quality lighting workplace. Quite often, such a machine is installed on the street. In this case, try to work only during daylight hours or with a good street lamp.
From the video you will learn how to make band saw with your own hands from available materials.
Many tasks can be performed with a specialized band saw created by with my own hands. Using the recommendations of the proposed article, it is quite simple to reproduce this device.
1 - tape drive pulley (lower), 2 - base, 3 - band saw, 4 - V-belt A710, 5 - damper, 6 - guide, 7 - carrier rod, 8 - tape drive pulley (upper), 9 - table ( plywood s20), 10 - AOL-22-2 electric motor, 11 - belt drive pulleys, 12 - bracket (steel angle 40x40), 13 - M12 nut (2 pcs.), 14 - upper support, 15 - adjusting screw, 16 - slider
The desktop of a home-made band saw (dimensions 420x720 mm) is made of plywood 20 mm thick, pasted over with textolite on top. Around the perimeter, it is edged with hardwood slats. There are narrow grooves in the table to guide the saw band. The base is a box measuring 420x720x500 mm glued from 20 mm plywood. Among other things, it serves as a place to collect sawdust.
The carrier bar is a section of channel No. 8 680 mm long, the shelves of which are cut to a height of 20 mm for convenience. The bar is attached to the table with a bracket from a 40x40 mm corner and four M8 bolts. The saw band drive pulleys are machined from 20 mm thick plywood. On the working surface, they are pasted over with dense sheet rubber, docked at the mustache. Used polyurethane adhesive. After rubberizing the pulleys, the wood is impregnated with epoxy resin, sanded and painted. The working surface is barrel-shaped, necessary to hold the running saw blade. A duralumin bushing is glued into the upper pulley with epoxy resin, in which a socket for a 60203 ball bearing is machined. The lower pulley is mounted on an axle made of 30KhGSA steel and fastened with three 5x20 screws. The axle is inserted into a box with two 60203 ball bearings mounted on the lower end of the carrier rod. At the other end of the axle, the driven pulley of the belt drive is fixed through the spacer sleeve. After installation, balancing is carried out belt pulleys. The principle of operation and the dimensions of the details of the saw band tension system are clear from the figures shown (section A-A).
Tape drive pulley (upper)
The gear ratio of the belt drive from the engine is i=1, so the driving and driven pulleys are the same, except for the mounting hole, which on the driving pulley depends on the motor shaft. Pulleys are made of duralumin. V-belt - A710 (in this design).
To eliminate vibrations of the saw band, a damper (vibration damper) is provided, assembled from textolite parts on M6 bolts. The fixed element of the damper is fixed at the bottom of the desktop, and the movable bar allows you to select the required gap. It should be noted that an upper damper is also provided on the band saw, however, its installation is advisable if the upper pulley of the saw band begins to "hit in diameter". Otherwise, the upper damper only increases the friction of the belt. By design, it is similar to the main one and, if necessary, is mounted on the bar with M5 bolts using a special bracket 105 mm above the plane of the desktop.
1 - base, 2 - M6 bolt (2 pcs.), 3 - strap, 4 - nut with washer.
The guide for feeding the sawn timber is made of a steel angle 100x100 mm. It is desirable to grind its perpendicular planes on the machine. In one of the shelves, two grooves are made along the edges to adjust the gap between the guide and. tape, and in the middle - a cutout to increase the course of the bar. Safety during operation is ensured by a protective casing that covers the entire assembly of the upper pulley of the saw band, which leaves the cavity of the casing only in working area.
The saw blade itself deserves great attention. It must be sufficiently elastic, on the one hand, and durable, on the other. For its manufacture, we recommend cold-rolled sheet steel grade U8, U10 or 65G with a thickness of 0.2-0.4 mm for sawing soft woods (balsa, linden) or 0.4-0.8 mm - for more hard rock. By the way, many people use steel tape measures made of high-quality metal with a thickness of 0.2 mm and a width of about 10 mm for this purpose. "Automatic" modern roulettes with curved profile tapes are unsuitable - only old samples are suitable. The length of the workpiece for the given dimensions of the machine is 1600-1700 mm. On the strip-blank, teeth are cut with a file in increments of about 3 mm, after which the tape is soldered into a ring, the ends at a length of 3-6 mm are sharpened in thickness by a mustache. Then the place of adhesion is sprinkled with borax and warmed up for gas burner. Solder brand PSR-40 is applied to the joint and the seam is tightly compressed with pliers with asbestos pads on the sponges (otherwise, the joint cools quickly and the metal in this zone becomes brittle). If necessary, the joint is ground. To obtain a better cutting surface, the front and rear surfaces of the teeth are sharpened in the same way as a hacksaw for wood and slightly divorced. Of course, you can also use commercially available blades for branded band saws, but then the dimensions of the machine should be made in advance in accordance with the dimensions of the purchased blade.
The considered home-made band saw is used for straight-line sawing of soft woods (balsa, linden, aspen, spruce, pine). Harder woods (beech, oak, mahogany) can also be sawn when a 0.8 mm thick tape is installed on the machine.
The disadvantage of this version of a homemade band saw is a small overhang of the blade, but this greatly simplifies the design. If a small blade overhang does not suit you, then in order for the blade overhang to be like that of branded band saws, you will have to make the location of the carrier bar like theirs and use larger diameter pulleys.
Specifications of a homemade band saw:
Maximum sawing thickness, mm
soft breeds - up to 100
hard rocks - up to 40
The smallest cutting width, mm - 0.25
Tape drive pulley diameter, mm - 240
Center distance of belt drive pulleys, mm - up to 500
Gear ratio from engine to drive pulley, i - 1
Engine speed, rpm - 2800
Electric motor power, kW - 0.6
Rated voltage, V - 380
Linear speed of the tape, m/s - 35
Tape length, mm - 1600-1700
Sawing speed, m/min - up to 5
Overall dimensions, mm - 720x420x920
The inhabitants of their own homes, who prefer to do everything on the farm with their own hands, often have a need to saw wooden blanks. Buying a ready-made device for these purposes is quite expensive. Making a band saw for wood with your own hands is not the best simple task, but for a hardworking person it is quite doable. The main motivation is saving Money, since old disassembled furniture and other improvised material can be used to create structural elements.
The design and scope of the band saw
A band saw assembled according to the provided technology can be used both at home and for industrial purposes, for example, at a private sawmill or a small woodworking enterprise.
Depending on the specifics of the application, the design of the tape apparatus may vary somewhat, but the main elements are always the same:
- stable frame- mainly wooden, since welding is not required for its manufacture, which greatly facilitates the assembly process.
- electric motor- ensures the functioning of the device (a drill connected to the pulley shaft is suitable for a home band saw).
- Pulleys- rotating mechanisms that are installed on the frame of the device provide fastening and movement of the saw blade.
- cutting tape- acute saw blade moving fast and sawing wooden blank(there are types for metal and polypropylene).
- Other structural elements- belts, tabletop, guides, protective cover, sawdust container and others.
The main advantages of a band saw for wood
Compared with other types of sawing machines, a band saw for wood has a number of significant advantages:
- High performance and low heat dissipation.
- High speed, accuracy and quality of cutting.
- Excellent maneuverability, allowing you to cut not only straight, but also figured workpieces.
- Safety - using a band saw is much safer than its disc or chain variety.
A homemade band saw has the main advantage of being cheap to manufacture and use.
The process of making a band saw for wood with your own hands
Making band saws with your own hands is a responsible and time-consuming process, but money savings, availability and quality of the work performed compensate for this.
Frame requirements and preparation
For the manufacture of the supporting frame, you should choose a thick beam of hardwood (maple is perfect). This is necessary so that the design of the device can withstand future loads and does not vibrate during sawing work.
Initially, you need to develop a drawing of the future band saw. It can be schematic or detailed, indicating the dimensions of each element of the apparatus. The height of the frame directly depends on the size of the room and the features of the planned use. It is necessary to consider the height of the table, its dimensional characteristics, the diameter of the pulleys and the length carrier beam. After carrying out all the calculations, individual elements are made from improvised material.
Frame assembly
The frame of the band saw is a C-shaped base, consisting of a carrier beam and two supports for pulleys fixed to it, for the manufacture of which a thick multilayer plywood. The supports must be installed at a sufficient distance from each other, taking into account the specifics and dimensions of the materials planned for cutting on the machine.
Table assembly
The dimensions and height of the desktop are selected individually for each master. Important requirement- two pulleys (driven and driving), an electric motor and a chip box should be placed under the table. Often workplace performed in the form of a closed pedestal that contains all the described details. The tabletop must have a slot for the cutting tape.
Pulley installation
The diameter of the pulleys can be any, but it must correspond to the dimensions of the entire apparatus. To work with wide blades, you should choose wheels with a large diameter and thickness. The ends of the driven wheels must be convex, which ensures self-centering of the cutting blade, and the leading (belt drive pulley) - with a recess that guarantees reliable fastening belts.
On the ends of the wheels to protect the tree, it is necessary to pull bicycle tubes or you can wrap them in several layers with electrical tape, but this method is only suitable for small devices.
To adjust the belt tension, the upper pulley must be mounted on a movable block equipped with a handle, which, when rotated, pulls the wheel up, as well as a special screw that weakens or fixes the structure. lifting mechanism can be anything that is left to the discretion of the master. Instead of a bar, a handle and a screw, a lever, a very tight spring and bolts provided at different levels may well be used.
The lower part of the apparatus consists of two wheels mounted on one shaft. On the first wheel, located parallel to the top, the cutting blade is pulled, and the second one acts as a drive and is connected by belts to the electric motor.
Canvas selection
The cutting tape can be made independently, but this is an extra and unjustified work. The quality of sharpening the tape affects the accuracy and aesthetics of the cut. Therefore, it is better to purchase a finished tape fabric. The choice of their varieties in stores is huge, they differ in the number of teeth, tooth separation and their sizes (small, medium or large).
Machine settings
The band saw before starting work is carefully prepared and tested at idle. You need to check that:
- the wheels are located strictly parallel to each other, and their rotation is carried out easily, smoothly, without jerks and beating;
- the cutting belt is well stretched and is strictly perpendicular to the working plane.
Failure to comply with these requirements may result in best case to the distortion of the cut, and in the worst case - to the tape jumping off the wheels, which is dangerous for the health and life of the master. Excellent constructive solution- installation of guides made in the form of a bar and three roller bearings holding the tape (instead of two side bearings, wooden blocks- limiters). The safety of the entire structure will be ensured by a special casing consisting of two separate parts covering the pulleys.
Possible problems
In the manufacture of a tape sawing machine, some difficulties may arise:
- You need to be able to prepare drawings and work with them.
- You will need a variety of equipment, such as a jigsaw, a circular saw, drill, screwdriver and more.
- It is necessary to ensure the stability of the entire structure in order to subsequently process heavy materials.
List of disadvantages of a band saw for wood
Do-it-yourself band saw for wood, in addition to advantages, has several disadvantages:
- This sawing machine can only be stationary and not suitable for transportation to different places.
- It is large and takes up a lot of space.
- The device makes a lot of noise during operation.
- The cutting area is limited.
Not every one of us will immediately be able to answer the question, what is it? Although, in principle, everyone heard about a band saw (more often it is called a machine). This is nothing more than an ordinary (small) sawmill. For the owner of a private building, and even living in countryside, a thing more than necessary (and for a city dweller it will not be superfluous in the economy).
With its help, you can not only solve many household issues. A band saw with a reasonable approach becomes a reliable source of additional income.
Such a machine, if there is a desire, appropriate skills and a tool, it is quite possible to do it yourself. But so that the reader is not deceived in advance by the easy prospect of its construction, it should be immediately stipulated that this is a rather complicated matter, since a number of problems will arise that will have to be solved.
Organizational events
- Need a separate room or vacant lot in the backyard area. As practice shows, for normal operation band sawmill needs at least 18 m². In terms of size, this a large room in a city apartment.
- Given the weight of the workpieces (log, timber) that you have to work with, you need to ensure maximum stability of the entire structure. So to install the machine "just on wooden floor" there is no point. You have to take care of a strong base.
- The greatest difficulty is the "design" of the adjustment mechanism. Without it, all boards will "come out" of only one, standard thickness. We'll have to figure out the specifics of his device.
- Debugging the operation of the entire mechanism requires certain knowledge in mechanics. In addition, you need to master the technique of sharpening the saw and its wiring.
- Appropriate measures must be taken to comply with security measures. Including, when installing a sawmill in a closed room - the arrangement of forced exhaust.
- Naturally, what you need to have on hand necessary tools and equipment -, perforator and a number of others.
If the reader is not afraid of all this, then we will continue the story. By the way, a band saw is considered an ideal “unit” for accurately cutting boards of any thickness. Various designs(drawings, diagrams) sawmills are available in abundance. A good owner himself will be able to choose the best option.
We will consider a specific model, and using its example it will not be difficult to understand all the features of assembling band saws. All dimensions given are in "mm".
So that after reading the "Instructions" no additional questions arise, it is first advisable to dwell on some general points.
The principle of operation of the band sawmill
The saw mechanism itself is in a fixed, fixed position. The workpiece, intended for cutting, is placed on a trolley, which is moved manually.
Location cutting tool can be both vertical and horizontal. The setting depends on what kind of work is supposed to be done - sawing the logs into pieces or their "dissolution" into boards.
Materials and fixtures
There are many on the Internet various recommendations, including assembling a desktop from elements of wood and textolite. But how reliable will such a design be, given the weight of the samples “for sawing”? Plus - what will be the period of use, since any wood, no matter how it is processed, is subject to decay.
Outdoors, definitely metal. The design will turn out to be much more reliable if materials such as a channel, a corner, a steel strip are used for all its elements.
In some proposed self-manufacturing models, a chainsaw is used as a cutting mechanism. But how expedient is this, given the width of the cut and, as a result, the increased consumption of wood (increase in the mass of sawdust)? Therefore, it is better to install a steel sheet prepared accordingly.
As an option - from a mechanical hacksaw. Besides tape construction allows you to work with workpieces of larger diameter.
Depending on what is supposed to be “produced” - a board or slats, what types of wood to work with, the engine model is also selected (pos. 10). For small sawmills, an engine with a power of 2.5 - 3 kW is enough.
Assembly order
Table
The dimensions of it (pos. 9) and the frame (pos. 2) are chosen arbitrarily. In the proposed model they are 500 x 420 (mm). A channel (No. 8) was used as a rod (pos. 7), prepared for the installation of all elements.
Its fastening to the table is a corner ("magpie").
Pulleys
Dimensions are given in the drawings (pos. 11). For the upper (pos. 8) and lower (pos. 1) they are the same.
In order to ensure safe operation sawmill top pulley must be covered with a casing.
Damper
Its task is to “quench” vibrations (pos. 5). Since the pulleys are the same, the gear ratio = 1.
guide
Provides centering of the workpiece, which is fed "to the saw" (pos. 6). In this case, this metal corner. Cutouts and grooves provide the possibility of changing the position (adjustment).
Ribbon
(Pos. 3). If it is not possible to purchase a factory-made product, then you can make it from steel (cold-rolled - 65G or U8, 10). The thickness of the canvas depends on the type of wood. For soft rocks, it is recommended from 0.2 to 0.4; for solid - from 0.4 to 0.8.
It is necessary to cut the teeth on it, and then solder it into a ring. How to do this, as well as to sharpen it, is a question that requires separate consideration.
Tension mechanism
Details not noted in the text:
- V-belt (pos. 4);
- stop (pos. 12);
- support (pos. 14);
- adjustment element (pos.15);
- slider (pos. 16).
It remains to be added that all moving elements are mounted on bearings and shafts. How to choose them correctly according to the existing drawings, there is no point in explaining to the masterful owner.
This design will solve the set economic problems- cut the board, trim it, dissolve it into slats and the like.
To many people who own their land plots, very often you have to work with a tree, since it is the main building material. The process of working with this raw material continues constantly: you need to attach an extension, chop firewood or update the fence.
A band saw is commonly used for sawing wood.
Various sawmills are excellent helpers in this matter, as they have a number of advantages. But since such products are not cheap, a DIY band saw is not such a bad idea.
It is worth mentioning right away that band sawmill difficult to make artisanal. You will need a lot of different components, you have to do a lot of welding and turning, and you also need to sharpen the saw in a special way, but the most important thing is the corrected work of the entire tandem.
A detailed description of the process of making a band saw with your own hands
The first thing to do is to decide on the room in which the manufactured structure will be located. Optimal location- 18m 2 (6x3m).
Then you need to start making the working surface of the table. Standard sizes- 420x720 mm. The table must be cut out of plywood, whose thickness should be at least 20 mm, then textolite should be glued onto the resulting rectangle. Next, you should edging the table with hardwood slats, this is done around the perimeter. Grooves must be provided in the table, their purpose is to support the wiring of the saw blade. Upon completion of work, the desktop should look like a box with dimensions of 420x720x500, which is glued from plywood 20 mm thick.
After all operations with the table, it is required to attach a carrier bar to it - a section of channel 8, the length of which is 680 mm, it is best to cut the shelves to 20 mm for practicality. It is recommended to attach the bar with a bracket, from an angle of 40x40 mm, it should be fixed with M8 bolts in the amount of 4 pieces. The saw drive pulleys must be machined from 20mm plywood. Their surface must be glued with sheet rubber, for this purpose it is required to use polyurethane glue. After the pulleys are covered with rubber, the wood must be impregnated with epoxy, sanded, and also painted.
When a band saw is made with your own hands, you should not miss the detail that the working surface should be in the form of a barrel, it contributes better job and holding the saw blade.
Need to take epoxy resin, with its help, glue a duralumin bushing, in which a special socket for a ball bearing is machined.
After that, the pulley (lower) must be mounted on a steel axle. The lower pulley is attached to the axle with 3 screws 5x20. After that, the axle is mounted in the axle box, in which there are 2 ball bearings, it must be mounted in the lower end of the rod.
The driven pulley of the belt drive must be mounted through a spacer bushing at the other end of the axle. After that, the belt pulleys must be balanced.
The ratio of the belt drive from the engine is i=1, which means that the driven and driving pulleys are identical, except for the mounting hole, since on the driving pulley it will depend only on the motor shaft.
In order for a do-it-yourself saw to have no oscillations of the saw band, it is necessary to install a damper. It is made of textolite parts on M6 bolts. The fixed element of the vibration damper must be fixed under the desktop, as for the movable bar, it helps to choose the desired gap.
Damper: 1 - base, 2 - M6 bolt (2 pcs.), 3 - bar, 4 - nut with washer.
When assembling a band saw, it should be noted that an upper damper is also provided on it, but its installation is necessary only if the upper pulley will “hit in diameter”. In another case, such a damper can only increase the friction of the tape. It must be fastened with M5 bolts, with a special bracket, 105 mm above the working surface of the table.
After that, you need to install a guide that will feed the timber for cutting. It is made of steel angle 100x100 mm. It is recommended to grind the perpendicular planes of the steel angle on the machine. The edges of one shelf must be provided with 2 grooves, this will allow you to adjust the gap between the guide and the tape, and in the middle - a cutout. It is necessary to increase the course of the bar. For safer operation, the upper pulley assembly, the tape of which is visible only when located in the working area, must isolate the protective cover.
When talking about how to create a band saw with your own hands, you need to pay attention to the saw band itself. The product must be flexible and durable. The saw blade is best used if it is made of cold-rolled sheet steel of grades such as U8, U10 or 65G. It should be 0.2-0.4 mm thick if you have to work with soft woods, if with hard ones, then from 0.4 to 0.8.
1600-1700 mm - the length of the workpiece, which is required for the described dimensions of the machine. Before bending the tape into a ring and soldering, it is necessary to cut the teeth with an interval of 3 mm. After that, the place that will be soldered must be sprinkled with borax and heated on a gas burner. In order to prevent the fragility of the metal, in the place where the soldering was carried out, PSR-40 solder should be applied, and then the seam should be squeezed tightly enough with pliers, if desired, the place of soldering can be polished. The teeth need to be sharpened and set a little apart, this contributes to a more productive cutting surface.
The saw, assembled with your own hands, is used for sawing wood species such as linden, spruce, pine, aspen and other soft woods. For sawing hard woods such as oak, mahogany, etc., a 0.8 mm thick band must be installed.
This is one of several possible ways making a band saw in a handicraft way.