The best blades for a hacksaw for metal. Hacksaw blade

We provide answers to questions about what types of hacksaw blades are used for metal, how to choose and install them correctly, and how to extend the service life of the consumable.

Electric and manual hacksaws have a removable working element - a file, also known as a hacksaw blade. As a rule, it has a length of up to 300 mm, a width of 12-15 mm and a thickness of less than 1 mm. This material provides answers to questions about what a hacksaw blade is, how to choose and install it correctly, and also describes some products that are in demand by consumers.

Hacksaw blades are a narrow strip, at the ends of which there are two holes for attaching to the tool. There are three main criteria for their classification:

The division into groups according to the first criterion occurs like with hacksaws - blades for manual (mechanical) and electric (sometimes called machine) tools are distinguished. The dimensions of the working elements vary. So, for manual ones, canvases with a length of 250-300 mm, a width of 12-25 mm, and a thickness of 0.63-1.25 mm are used. An example is a domestically produced blade made of Kh6VF steel with parameters 1.25x12x300, which will cost the buyer 30 rubles per piece.

The parameters of files for power tools vary from 150 mm in length, to 55 mm in width, from 1.25 to 2.5 mm in thickness. An example is a blade for a reciprocating saw HAMMER RS BL 001, the parameters of which are 150x19x1.25 mm, and the cost is 100 rubles per piece.

Another difference between saw blades for hand and reciprocating saws is the number of holes for fastening. The first ones have two, the second ones have one.

• carbon(the least durable, suitable for non-ferrous or soft metal; marked as HCS); for example, Bosch HCS TF 350 M 408 mm GFZ for 1400 rubles;
• high-speed(they have the most wear-resistant teeth, but are fragile and high in price; HSS marking); Gross HSS 18TPI 300 mm - 160 rubles per pair;
• bimetallic blades(innovation on the market, displacing analogues; the base is carbon steel, on top of which a high-speed strip is welded, serving as the basis for the teeth; designated BIM); Gross Variozahn 300 mm BIM from 300 rubles per pair.

There are also canvases from alloy steel(designation HM), but more often they are used for cutting brick, concrete or stone.

The size of the teeth for hacksaws for metal is 2-2.5 mm. This parameter is considered “small”, since there are products with larger teeth (for example, for wood saws it is 4-6 mm).

International standardization provides for a different principle of dividing the canvases. So, the number of teeth per 1 inch of file is taken into account. This figure is given in the marking before the letters PPI (points per inch) or TPI (formula “PPI - 1”). The higher the number, the more small tooth presented on this canvas.

When choosing products for a hacksaw, the user does not have to guess for a long time - most well-known files have a tooth pitch of 18 or 24. This is how branded products for construction are designated (for example, Standart 24 TPI 300 mm, Kraft-Flex 18 TPI blade from the manufacturer Kraftool).

The main classification of blades for metal hacksaws is based on the given criteria. It is important to know that the presence of set teeth is welcome if the user expects comfortable work without pauses or tool breakdowns. Now let’s talk about how to properly install a hacksaw blade in a manual or electric tool.

Methods for installing the canvas

• threaded clamp;
• lever mechanism.

In the first case, the canvas is stretched between the mounting holes and secured with a wing nut. In the second, the actions are performed similarly, only the file is put on and removed using a special lever, usually located at the edge farthest from the handle.

The blade is installed in such a way that the teeth tilt in the direction opposite to the handle. When using a hacksaw, the metal layer will be cut while moving away from you. The reverse direction - "toward" - is idle, in which the workpiece is not cut. Therefore, efforts during the reverse movement are in vain. In addition, it is so easy to dull the teeth of the blade.

For electric hacksaws, the working part is attached differently. For example, below is the process of replacing the blade on a Makita JR 3070 CT reciprocating saw. To do this you need:

• turn the holder head counterclockwise at a slight angle so that the internal slot allows you to remove the product;
• remove the canvas;
• Place the end of the new file into the slot of the holder until you hear a characteristic click.

By the way, the blades are also divided by the type of shank (the section that connects to the holder). There are shanks with one stop, two-jaw, universal 1/4, clamping 1/2 and special for drank Makita having two holes at the end.

The principle of attaching hacksaw blades to reciprocating saws is the same for all devices; The manufacturers thought through the design, made inserting the cutting element convenient and made the user’s work easier.

Rules for choosing equipment

1. There should be no cracks or signs of corrosion on top of the canvases.
2. Make sure the file is elastic. To do this, you need to bend it slightly and release it. A high-quality product will instantly restore its original shape.
3. The cutting speed directly depends on the number of teeth per inch. The more there are, the less time the operation will take.
4. Among all the files, the one suitable for sawing a specific metal is selected. Preference should be given to red-hot iron or bimetallic products. The first ones look like stainless steel coated with a layer of nickel, but have dark teeth. The second ones are painted in specific color(red, yellow) or several shades. The listed canvases are much more durable than their black counterparts.
5. The length of the blade corresponds to the length of the hacksaw, whether we are talking about a manual or electric tool. In order not to make a mistake, it is important to study the markings that are on both the saw and the hacksaw blade.
6. You should not consider the price of a product as a key selection factor. A dozen cheap black files (like the Russian Kh6VF 1.25x12x300 mm, 77707 for 30 rubles) will become dull and fail while a more expensive analogue works (for example, Stanley 1-20-437 300 mm long for 120 rubles).

Having made your choice and purchased a metal unit for a hacksaw, all you have to do is secure the equipment and start working. It is also recommended to adhere to the rules for storing and using hacksaw files. Timely replacement of used equipment will extend the service life of hand or electric tools. If you have experience using certain files, share your opinion in the comments.

A hacksaw is considered a fairly common hand tool, which is designed to divide a workpiece into several separate parts of a certain size. Her design features characterized by the fact that it is possible to periodically replace workers closely. When processing metal, there is a very high probability of rapid wear of the cutting edge. Therefore, a function for replacing the tape was provided, which requires a small amount of time. There is simply a huge number of different canvases; let’s look at the features of choice and many other points in more detail.

Types of hacksaw blades and their design

Do not forget that the production of working hacksaw blades is carried out in accordance with established standards in GOST 53411-2009. The specified information in this regulatory and technical documentation determines the identification of two main groups: for machine and manual cutting. It is worth considering that a machine hacksaw blade for metal is purchased extremely rarely, since such equipment is used extremely rarely. The following versions are produced for a manual hacksaw:

1. Single hacksaw blade for metal with a distance between fasteners of 250 mm. In this case, the total length is 265 mm. This design option is suitable for a tool that is used when there is no need for high productivity.
2. Single versions with a distance between two fasteners of 300 mm. General indicator length is 315 mm.
3. For greater productivity, a double hacksaw blade is installed. The length of this version is the same as the previous one.

When choosing, attention is also paid to the width indicator, which for a single version is 0.63 mm, for a double version 0.8 mm. The height of the tooth in the first case is 12.5 mm, in the second 20 mm.

The value of the location step is also regulated, since such an indicator determines many operational characteristics.

Download GOST 53411-2009

In the manufacture of such a product, a variety of alloys can be used, on which the main operational characteristics largely depend. The most common alloys are:

1. X6VF.
2. High-speed alloys, for example, R5M5 and R12.

Hacksaw blades coated with tungsten carbide have recently become quite common, as they are characterized by increased wear resistance. It is worth considering that spraying can have a wide variety of colors; blue versions are available on sale; regular steel is dark gray.

The quality is also influenced by the uniformity of the wiring. A good hacksaw blade for metal has a deviation of no more than 45% over a length of 10 mm. Also, a visual inspection allows you to determine how equal the individual teeth are in height. Accurate results can be obtained by using a micrometer or other high-precision measuring instrument.

How to install a blade on a hacksaw for metal

The design of the tool in question allows for quick replacement of the hacksaw blade. It is worth considering that if a mistake is made, the product in question will not last for a long period. How to install a blade in a hacksaw for metal is a very common question, since this tool is found in almost all home workshops. The main recommendations are the following:

1. The instructions largely depend on the fastening system used in a particular case.
2. The threaded clamp, in which the hacksaw blade is installed and tensioned, has become widespread. A sudden change in the applied load becomes the reason why you have to periodically check the degree of tension.
3. There are tools with lever fastening. In this case, installation is greatly simplified, since it is enough to pull back the lever and install the hacksaw blade for cutting metal, and then tighten it in the opposite direction.

When considering how to properly insert a blade into a hacksaw for metal, it should be taken into account that after proper installation it creates a slight ringing sound during operation and may vibrate a little. However, at the time of sawing, the product should not change its position, as this may cause damage to the mounting holes.

Selection rules

Subject to certain rules it is possible to choose a suitable canvas that can last for a long period. The main recommendations are the following:

1. The surface should be free of cracks or other defects, as well as traces of corrosion. This is due to the fact that even minor damage will cause increased wear.
2. At the time of selection, you should make sure that the saw is elastic. To do this, bend it a little and then release it. A high-quality product almost immediately restores its shape, which indicates high flexibility.
3. As previously noted, the permissible cutting speed largely depends on the number of teeth per inch.
4. The determining factor in many cases is the type of material used. Often they give preference to hardened steel or bimmetallic products. The version with tungsten carbide coating lasts for a short period.

As practice shows, a low-quality version has to be changed several times, while a more expensive proposal will last for a longer period.

Only when correct use you can eliminate the possibility of damage to the hacksaw blade for metal. The main recommendations are as follows:

1. It is necessary to carry out processing at the same speed and applied force. Even minor changes can cause a defect.
2. You need to take breaks from time to time. The reasons are that too high a temperature causes an increase in ductility.
3. At this point, the entire hacksaw blade must pass over the surface. This ensures even wear.

You can often encounter a situation where, due to strong heat and applied force, metal plate bursts. Low-quality versions wear out quickly and become practically unusable.

Number of teeth

The determining factor is how many teeth there are per inch. The following depends on it:

1. Performance depends on the indicator. As the number of cutting edges increases, the task at hand becomes significantly more complicated and the chips become smaller.
2. A large quantity allows you to get a high-quality cut. This is achieved by reducing the resulting chips.

In addition, an increase in quantity causes an increase in the cost of the product.

Tooth shape of metal blades

Attention is also paid to the shape of the tooth. This indicator depends on:

1. Installation direction of the metal plate.
2. Degree of wear during operation.
3. Tool performance.

In most cases it is used classic shape, since it is considered a universal option.

Tooth pitch

The pitch of the teeth may also differ. This indicator of the hacksaw blade determines:

1. Performance.
2. Possible quality of the resulting cut.
3. Application area.

A fine pitch allows you to get a high-quality cut when working with various alloys.

Teeth setting

Removal of chips from the cutting zone is carried out due to a certain layout of the cutting edge. As previously noted, according to this criterion, several options are distinguished:

Today, many tool manufacturers specialize in the production of hacksaw blades. At the same time, domestic products are much cheaper, foreign ones are more expensive, but at the same time have higher performance characteristics. For long work Multiple items are required as they can wear out at a high rate.

The hacksaw is used to create through cuts on dense materials made of metal, cutting slots, trimming contour products. Locksmith tool Made from hacksaw blade and base machine. One end of the frame is equipped with a static clamping head, a handle for holding the tool, and a shank. The opposite part consists of a movable head and a screw that tensions the cutting plate. The heads of hacksaws for metal are equipped with slots into which the working blade is installed, secured with pins.

The frames are made in two forms: sliding, allowing you to attach a working blade of any length, and solid.

Peculiarities

Each type of material has its own cutting blade.

• Hacksaw blade for metal It is a narrow metal strip with thin teeth placed on it. The frames are made in appearance similar to the letters C, P. Outdated frame models were equipped with wooden or metal handles placed parallel to the blade. Modern models are made with a pistol-type handle.

• Hacksaw blade for working with wood- the most common joinery version of the product. It is used for processing and cutting plywood and wooden building materials of various densities. Design hand saws It is specially equipped with a beveled working surface; there are teeth on the side of the blade.

• For working with concrete The blade has larger teeth on the cutting edge. Equipped with carbide soldering. Thanks to this, it becomes possible to saw concrete structures, foam blocks, sand concrete.

• For processing metal products blades with a pitch width of about 1.6 mm are used; a file 25 mm long has up to 20 teeth.

The greater the thickness of the workpiece, the larger the cutting teeth should be, and vice versa.

When processing metal products with different hardness values, files with a certain number of teeth are used:

• angle and other steel – 22 teeth;
• cast iron – 22 teeth;
• hardened material – 19 teeth;
• soft metal - 16 teeth.

To prevent the file from getting stuck in the workpiece, you should first set the teeth. Let's consider the principle by which wiring is made.

• The width of the cut is greater than the thickness of the working blade.
• Hacksaw files with a tooth pitch of about 1 mm should be made in a wavy pattern. Each pair of adjacent teeth must be bent in different directions by approximately 0.25-0.5 mm.

• The plate with a pitch of more than 0.8 mm is spread using the corrugated method. The first few teeth go to the left side, the next few teeth go to the right.
• With an average step of about 0.5 mm, the first tooth is moved to the left, the second is left in place, and the third is to the right.
• Plate with a large pitch of up to 1.6 mm - each tooth is retracted in opposite directions. It is necessary that the wiring ends at a distance of no more than 3 cm from the end of the canvas.

Characteristics

GOST 6645-86 is a standard that sets requirements for the type, size, and quality of saw blades for metal.

This is a thin, narrow plate with holes located at opposite ends; on one side there are cutting elements - teeth. Files are made of steel: Х6ВФ, Р9, У10А, with a hardness of HRC 61-64.

Depending on the type of work, hacksaw files are divided into machine and manual.

The length of the plate is determined by the distance from the center of one hole to the other, a universal hacksaw file for hand tools has the following dimensions: thickness – 0.65-0.8 mm, height – 13-16 mm, length – 25-30 cm.

The standard blade length is 30 cm, but there are models with a length of 15 cm. Short hacksaws are used when a standard large tool is not suitable for the job due to its size, as well as for performing filigree types of work.

GOST R 53411-2009 establishes the blade configuration for two types of hacksaws. Files for hand-held equipment are available in three sizes.

• Single type 1. The distance between through holes is 250±2 mm, the length of the file is not more than 265 mm.
• Single 2 types. The distance from one hole to another is 300±2 mm, the length of the plate is up to 315 mm.
• Double, distance is 300±2 mm, length work surface up to 315 mm.

The thickness of a single plate is 0.63 mm, a double plate is 0.80 mm. The height of a file with a single set of teeth is 12.5 mm, for a double set – 20 mm.

GOST determines the tooth pitch values, expressed in millimeters, and the number of cutting elements:

• for a single plate of the first type - 0.80/32;
• single type 2 - 1.00/24;
• double - 1.25/20.

The number of teeth varies for longer tools - 1.40/18 and 1.60/16.

For each type of work, the value of the cutter angle can change. In the process of processing metal of sufficient width, fairly long cuts are achieved: each cutter of the file removes sawdust filling the chip space until the tip of the tooth comes out completely.

The size of the chip space is determined by the tooth pitch, rake angle, and clearance angle. Rake angle is expressed in negative, positive, zero values. The value depends on the hardness of the workpiece. A saw with a zero rake angle has a lower efficiency compared to a rake angle with a value greater than 0 degrees.

When cutting the hardest surfaces, saws with teeth that are sharpened at a large angle are used. For soft products the figure may be below average. Hacksaw blades with the sharpest teeth are the most wear-resistant.

The type of saw is classified into professional and home tool. The first option has a rigid design and allows work to be carried out at angles of 55-90 degrees.

A home hacksaw does not allow you to perform high-quality straight cut even with professional canvases.

Materials

The second criterion for choosing a hacksaw blade is the material from which the product is made.

Grades of steel used: Kh6VF, V2F, R6M5, R12, R18. Domestic products are made only from these types of material, but in specialized stores you can find products with diamond coating. The surface of the file is coated with various refractory metals, titanium nitride. These files differ in appearance by color. Standard steel sheets are light and dark gray, diamond and other coatings range from orange to dark blue. Tungsten carbide coating is characterized by extreme sensitivity of the blade to bending, which affects the short service life of the blade.

Diamond-coated tools are used for cutting abrasive and brittle materials: ceramics, porcelain and others.

The strength of the file is ensured by the hot heat treatment procedure. The saw blade is divided into two hardening zones - the cutting part is processed at a temperature of 64 to 84 degrees, the free zone is subjected to 46 degrees.

The difference in hardness affects the sensitivity of the product to the bends of the blade while performing work or installing a file into a tool. To resolve this problem, a standard was adopted regulating the indicators of effort applied to manual equipment. The force on the tool should not exceed 60 kg when working with a saw with a tooth pitch of less than 14 mm; 10 kg is calculated for a cutting product with a tooth pitch of more than 14 mm.

Files made of carbon steel are marked HCS, are used for working with soft materials, are not durable, and quickly become unusable.

Metal-cutting tools made of HM alloy steel are more technologically advanced, like blades made of alloyed chromium, tungsten, and vanadium. In terms of their properties and service life, they occupy an intermediate place between files made of carbon and high-speed steel.

High-speed products are marked with the letters HSS; they are fragile and expensive, but are more resistant to wear of cutting elements. Today, HSS blades are being replaced by bimetallic files.

Bimetallic products are designated by the abbreviation BIM. Made of cold-rolled and high-speed steel using electron beam welding. Welding is used to instantly join two types of metal while maintaining the hardness of the working teeth.

How to choose?

When choosing a cutting product, they are guided, among other things, by the type of tool.

For manual

Hand hacksaws are on average equipped with single blades of type 1 marked HCS, HM. The length of the file depends on the length of the tool frame, average around 250-300 mm.

For mechanical

For mechanical tools, saw blades with any marking are selected depending on the surface being processed. The length of the double cutting blade is from 300 mm or more. Mechanical equipment used in processing large quantity workpieces with a length of 100 mm.

For mini hacksaw

Mini hacksaws work with blades no larger than 150 mm. Mainly designed for convenient and quick cutting wooden materials and metal products of small diameter, work with workpieces, along a curve.

Before using the tool, you should correctly install the blade into the equipment.

The installation method depends on the design of the tool's mounting system. If the heads are equipped with slots, then the blade is inserted directly into them, slightly stretched if necessary, and secured with a pin.

To make it easier to insert the file into the clamping head, you can first lubricate the element with technical oil. If a sudden load occurs on the saw, you will have to periodically inspect the fastening, check the degree of tightening of the pin so that the blade does not fall out of the clamp during the process of cutting the product.

Installing a cutting product into a hacksaw lever type It is performed by extending the lever, putting on the blade, and returning the tool frame to its original position.

One of the most fragile consumables for tools used in working with metal materials is a hacksaw blade. Which blade to choose for sawing different materials so that it lasts longer, what are they?

Types of hacksaw blades

According to GOST standards for hacksaw blades, there are two types of blades: for cutting by hand and by machine.

Manual cutting blades have three main parameters:

• The distances in single models between fasteners are 250+/-2 millimeters. The canvas is 265 millimeters in length.
• The gap in single models between the fasteners is about 300 millimeters. The canvas has a length of 315 millimeters.
• Double. The distance between the fasteners is 300 millimeters. The canvas is 315 millimeters in length.

The thickness of the hacksaw blade (in a single version) does not exceed 0.63 millimeters, in a double version – 0.80 millimeters. The height of models with a single row of teeth is 12.5 millimeters, in models with a double row – 20 millimeters.

GOST requirements regulate tooth pitch, distance, quantity.

Universal hacksaws

Hacksaw blades for metal are narrow saws that are equipped with thin teeth. They are easily recognized by their frame, similar to the letters C and P, onto which the hacksaw blade is tensioned. Outdated models are equipped with handles (placed parallel to the blade). The modernized models already have a “pistol” handle.

Hacksaws for working with wood are considered the most common type of tool. Used for sawing plywood, various wooden Construction Materials. They are equipped with slightly beveled working surfaces, where sawing teeth are attached to the sides.

Hacksaw for concrete materials– visually can be confused with a joiner’s saw. The difference is the large teeth. There are models with soldered carbide material. This allows you to saw not only foam blocks, but also sand-concrete materials.

How to identify a quality tool

In order to understand how high-quality the device is, you need to take into account the following parameters:

Working blade length. It will depend on the size of the workpiece. The average length of the working part is from 300 to 700 millimeters.

Pitch of teeth. This parameter determines how hard or thick the material that requires cutting should be. For example, a step of 3.5 millimeters is used to cut soft wood materials. Steps of 5 millimeters are used for working with harder wood species.

When choosing a hacksaw blade, be sure to consider the quality of the coating. If the coating is of poor quality, the enamel may crack during operation.

What are the differences between the tools?

All hacksaw blades can be divided into two types - for household and industrial work (in the photo of the hacksaw blade the difference is visible to the naked eye). The advantages of industrial devices include structures with a rigid base, as well as the fact that they can be operated at an angle of 55 and 90 degrees.

Household tools are used for lightweight work; they may be a little “stormy” during cutting. Home option much cheaper than a professional tool.

What does the product consist of?

The design of hacksaws is very similar in all models.

The working surface is a hacksaw blade, stretched between a C-shaped arc.

The handle of a hacksaw is considered an important and basic part that affects the comfort of work. The most successful ones are the handles, which are equipped with rubber inserts.

Frame – a hacksaw blade is attached to it. Can be used to make frames various materials. Everything will depend on what will be cut later. For cutting high-strength metals, frames made of composite material are used.

The working conditions will depend on the design of the frame. For more comfortable conditions and the need to cut hard-to-reach places, it is better to take frames in which the tilt of the blade is adjusted.

The steel of a hacksaw blade is a thin strip of the most hard species. In the design of the saw, the hacksaw blade is the only part made of metal. It is considered the most vulnerable part. Requires careful handling in work.

Photo of blades for hacksaws for metal

A metal hacksaw is designed for cutting sheets of round, profile and strip metal. A hacksaw consists of hacksaw blade for metal and frames (machine). At one end of the machine there is a stationary head with a shank and a handle, at the other there is a tension screw, a movable head and a nut for tensioning the blade. The blade is inserted into the slots in the heads and secured with pins.

The frames are made sliding, which allows you to attach canvases of different lengths. To move the hacksaw apart, bend your knees until the rivet leaves the cutout. The rivet is directed into the other cutout and the knees are straightened. Machine with mobile holder It also includes a square with a handle, along which the holder is secured and moved.

Description of the canvas

A steel narrow thin plate with two holes and teeth on one edge. It can be manual or machine depending on the purpose. The following steels are used to manufacture these elements:

1. U10A;
2. P9;
3. X 6VF.

The hardness of the material should be HRC 61−64. They are inserted into the frame with the teeth facing forward. Almost always used for hand saws length 250−300 mm, thickness 0.65 and 0.8 mm, height 13 and 16 mm. Blade performance varies depending on the operating conditions of the cutter, which explains the difference in angle values.

When cutting a large metal workpiece, long cuts can be made: each tooth removes chips, which should fill the chip space until the tip of the tooth leaves the cut. The amount of space depends on the tooth pitch S, front (Y) and back (A) angles. Depending on the hardness of the workpiece being processed rake angle canvas can be zero, negative or positive. The cutting efficiency of a hacksaw with a blade with a zero angle is lower compared to one whose angle is greater than 0°. To cut harder materials, elements with a large tooth angle are used (they are more wear-resistant). For cutting soft materials this indicator should be smaller.

Number of teeth

In most cases, for cutting metals, blades with a pitch of 1.3–1.6 mm are used; with a length of 25 mm, there will be 17–20 teeth. The thicker the material being processed, the larger the teeth should be, and vice versa. For different metals blades with the following number of teeth are required:

1. Soft metals - 16;
2. Tempered steel of medium hardness - 19;
3. Cast iron, tool steel - 22;
4. Strip, angle and hard steel - 22.

Hacksaw 300 mm

Two or three teeth should be involved in the work process. To avoid jamming of the blade in the metal, the teeth are spread apart. The layout is carried out so that the width of the cut made with a hacksaw is slightly larger than the thickness of the blade. This prevents jamming in the blade cut and makes work easier.

For blades with a pitch of 0.8 mm (acceptable 1 mm), the tooth pattern should be wavy, that is, every two adjacent teeth are bent in opposite directions approximately 0.25−0.6 mm. The working element with a pitch of more than 0.8 is set along the tooth (corrugated set), two or three teeth are set to the left and to the right. With an average step, one tooth is retracted to the left, the second is not retracted, and the third is retracted to the right. With a large step, one tooth moves to the right and the other to the left. It is appropriate to set the tooth at a pitch of 1.6 and 1.25 mm. The wiring should be completed at a distance from the end of no more than 30 mm.

Preparatory stage

First, the material to be processed is firmly secured in a vice. And it must be secured in such a way that it is convenient for the worker to work. Next, in accordance with the hardness, shape and size of the workpiece to be cut, a hacksaw blade is selected. If the rafters are long, it should be with a large tooth pitch, if short - with a fine one.

The hacksaw is installed in the slots of the head so that the teeth are not directed towards the handle. The end of the blade is inserted into the stationary head and secured using pin bookmarks, then the second end of the blade is placed in the slot of the pin, which is secured with a pin. The blade is tensioned manually (you cannot use a vice or pliers) by rotating the wing nut. The hacksaw should be kept away from your face.

With a slight distortion, the canvas, stretched tightly, and with significant pressure, weakly stretched, lead to bending, which is why a break is possible. The degree of tension is checked by pressing the finger on the side: if there is no deflection, the tension is sufficient.

Cutting process

During the cutting process, two moves are made:

1. Worker - the tool moves forward from the worker.
2. Idle - the hacksaw moves towards the worker.

When idling, there is no pressure on the tool; as a result, the teeth only slide. During the working stroke, light pressure is provided with both hands, and the hacksaw moves in a straight line.

Operating rules

When cutting, you need to stand firmly, straight and free in front of the vice, half-turn to the axis of the workpiece or to the jaws of the vice. The left leg is placed slightly forward approximately along the line of the workpiece, and the body rests on it. The feet should be placed so that they form 60-70° (with a distance between the heels).

The worker’s posture can be considered correct when the right hand with the tool, set in the initial position and bent at the elbow, forms right angle between the elbow and shoulder. The handle is grabbed right hand so that the handle rests on the palm. They grab it with four fingers and thumb placed on top along the handle.

The fingers of the left hand grasp the movable head of the hacksaw and the nut. During the cutting process, strict coordination of efforts is observed, that is, the correct increase in pressure. The movement of the tool must be horizontal. They press on it with both hands, but with the left hand a slight force is made, and with the right hand they carry out mainly reciprocating movements.

1. Short pieces are cut along the widest side. When processing corner, channel and T-profiles, it is better to change the position of the workpiece rather than make a cut on the narrow side.
2. Cutting should be carried out smoothly and slowly, no more than 40-60 double moves are made within a minute.
3. The entire canvas must be involved.

The greatest difficulty for beginners is the wobbling of the working element. If this problem occurs, you should check the condition of the fasteners - wobbling may indicate insufficient tightening of the “lamb”. Unlike carpentry tools It will not be possible to sharpen ours with a new one, it needs to be changed.

When it is necessary to make a cut in hard to reach place, it is better to use a hacksaw handle for metal.