Metal cutting is a laborious task, requiring serious patience, and requiring good tools.
One of the most common tools is a hacksaw for metal. Basically, the type of hacksaw is about the same; the blade replacement mechanism is different.
Two fastenings of the web are common, this is a threaded clamp, the web is fixed and tensioned with a special nut with a wing.
Another type of attachment is a linkage. Hacksaw blade for metal in this case is removed and installed with the participation of a small lever.
In the latter case, according to the manufacturers, the removal and installation of the web is faster. But the cost of such a hacksaw is much more expensive.
It is somehow difficult to imagine a person who would work without breaking away with a hacksaw all day, and the speed of changing the blade would be very important for him.
Therefore, the choice of the mechanism for fixing the hacksaw for metal depends solely on your desire, no more. Well, from the fullness of the wallet, too.
There are plenty of hacksaw blades to this day. The choice is primarily between domestic and foreign manufacturers.
Domestic canvases do not differ in quality, they quickly blunt, teeth fall out. But their cost is five, and sometimes fifteen times lower than foreign.
Metal sheets as red-hot and bimetal are also distinguished. The latter are more flexible, less likely to break, but also more expensive than red-hot ones.
Hacksaw blades differ in the number of teeth, they come with 18, 24 and 32 teeth.
To cut a harder material, you need to take a blade with a large number of teeth, and vice versa.
If you take a sheet of metal with a small number of teeth for cutting solid material, then sawing will be much more difficult.
It is necessary to install the blade in a hacksaw for metal correctly, the teeth should be directed in the opposite direction from the working one.
Only in this case, less work will be spent on working with a hacksaw and metal cutting will be easier and faster.
on the topic:
Canvas for a hacksaw for metal. how to distinguish quality?
A blade for a hacksaw for metal is one of those parts that quickly become unusable and require frequent replacement. However, knowing the subtleties of choosing a product, you can ensure a long and high-quality work!
Universal saw. hacksaws for all occasions
Even an ordinary, at first glance, a hacksaw can cause confusion among the average consumer; on the shelves he will find many different tools!
To simplify the selection, we list three main types of tools into which, depending on the purpose, they are divided:
Hacksaws for metal. a narrow saw with thin teeth. It has a characteristic recognizable appearance, mainly a C-shaped or U-shaped frame, between the ends of which a stretch is attached to the canvas.
Old hacksaw models often have a handle that runs parallel to the blade, modern products are equipped with a much more ergonomic “pistol” handle. A wood hacksaw is a classic carpentry tool used for sawing wooden building materials, as well as plywood sheets. As a rule, carpentry hacksaws have a wide beveled working part, on the edge of which cutting teeth are located. The teeth are divided alternately left and right to facilitate cutting.
At the same time, straight teeth in some models help remove chips from the cut line. The hacksaw on concrete looks similar to the device of a carpentry saw, with the difference that the first tool has larger teeth.
Quite often, they have hard metal alloys, so this tool can be used to saw foam blocks and sand concrete structures.
The quality of the tool is determined by the following indicators:
- Web length. depending on the size of the workpiece, the corresponding tool is also selected. On average, the length of the working part ranges from 300-700 mm.
- Teeth pitch. this indicator determines the thickness and hardness of the materials with which the tool is able to cope.
For example, a pitch of 3.5 mm is suitable for sawing wooden materials from soft woods; five-millimeter hacksaws work with hardwoods.
Hacksaw. cut steel in slippers!
With the advent of hacksaws for metal, working with various metal products has become much easier. even at home, in your garage or workshop, you can saw off the desired piece of reinforcement or thick wire.
And even the appearance of mechanical analogs did not affect the popularity of hand tools: firstly, the cost is affordable for almost any master, secondly, high precision is achieved in the process, thirdly, the tool is almost impossible to break, and fourthly, the independence of the product from the mains makes it indispensable in the field.
Modern hacksaws differ not only in their “pistol grip”. manufacturers come up with and improve blade fastener systems.
The threaded clamp, which is present in all old models, is gradually replaced by a lever mechanism, due to which the installation of the blade is several times faster. True, they are more expensive than hacksaw with a “lamb”.
However, structural features, by and large, only affect the ease of maintenance of the tool, the quality of the cut and the speed of the work depend, first of all, on replaceable hacksaw blades.
There are plenty of them on sale, you can find the product on any wallet and any purpose.
The cost of the blades depends on the alloy from which they are made and the number of teeth per inch. Basically, there are parts made of red-hot steel and bimetallic products. The disadvantage of hardened steel is its fragility, which is why products, although they are cheaper, they break more often, while bimetallic ones boast good flexibility and hardness, which is why they cost more.
Choosing a Hacksaw for Metal. Don’t Overpay!
Even the choice of such a simple tool as a hacksaw for metal, you should approach the knowledgeable.
Remember that the seller’s task is to sell the most expensive instrument possible, the capabilities of which you will use by almost 10%. Use the rule of the middle ground. avoid absolutely budget models and do not buy the most expensive ones.
The tool should be practical, provide for the ability to work at different angles and with different canvases.
The popularity of some models is due to the ability to work with canvases of any length, and this is indeed a very successful move. Also pay attention to the ability to change the angle of the canvas in the frame itself. this function allows you to work with metals even in hard to reach places. Take the tool in your hands, grasp the handle with your palm. The palm should completely cover the handle, while the fingers should not interfere with each other and should not rest on the parts.
Avoid hollow handles. a little passing, you will break the tool. The product should not be loose, all parts are fitted and create a feeling of reliability.
Hacksaw blade for metal. the choice based on knowledge!
When buying a canvas, pay attention, first of all, to its appearance. even the smallest flaws can affect its work.
Avoid canvases with traces of corrosion, cracks, roughness. The ideal canvas should be smooth, clean, with even teeth, and when bent, instantly restore its original shape. The more teeth per inch, the faster you can cut a part. So, there are canvases with 18 and 24 teeth per inch, most often they are bought for the home, but 32 teeth per inch is the lot of professionals.
Avoid buying black goods. they are enough for several visits, then crumbling teeth make work impossible.
Red-hot products, although not very flexible, are much more convenient to work with. In appearance, they look like a nickel-plated strip of metal made of stainless steel with dark teeth. it is precisely by the color of the teeth that it is easiest to guess about their hardening. Bimetallic canvases are usually painted in some colors, and although they cost more, they will last much longer. After choosing the right material, make sure that the length of the product matches the length of the hacksaw.
Using the tool. patience and work will grind everything!
Hacksaw for metal does not require any special skills in operation.
You will only have to monitor the condition of the canvas and change it in a timely manner. By the way, due to its small teeth, the tool is suitable for working not only with metal; it will also show excellent performance in cutting polystyrene, plastic, chipboard, PVC, laminate and even ceramics and plexiglass. In this case, the edges of the cut will be quite smooth.
The biggest difficulty that beginners encounter in the process of cutting metal and other materials with a hacksaw is the flicking of the blade from side to side.
If this happens, check the condition of the fasteners. wagging may mean that the lamb is not tightened enough. By the way, you should not rely on the effort of only one hand. use at least pliers to increase pressure.
Unlike a carpentry hacksaw, you won’t be able to sharpen the sheet after it is dull, you just have to replace it with a new one.
Fasten the blade with the teeth down and forward from the handle. Tension the canvas during its change is necessary so that from the slightest blow it rang like a string.
Look, do not overdo it!
You can find the optimum tension only by experience. The hacksaw blade should lie on the part during operation. You need to work at an angle of up to 45 °. so you get less vibration and noise, and the cut will be even. During the first movements, the canvas should not be pressed. excess power is useless here, the canvas will only begin to slide in different directions. Increase the pressure when moving forward, when you return the saw to its original state, do not use any pressure at all.
And already when the canvas cuts a good edge, you can work at full strength.
Metal cutting has been and remains the main technological process used for many centuries in the manufacture of metal products.
It is carried out using a variety of methods and cutting tools. But two methods most often find application:
A mechanical method of cutting metal, for example, cutting a circle, involves sawing it with saws, cutting using scissors and other options based on the need for considerable physical effort.
The thermal method is based on the use of heating a section of a metal either using a hot jet of gas, liquid, plasma, or by passing current at the place where it is planned to separate the workpiece into separate parts.
Home craftsmen usually cut metal using either a bench saw or roofing scissors.
Manual metal cutting with a hacksaw is a rather laborious and lengthy process.
Scissors can cut metal sheets much faster. Some variations of this tool are described below.
With their help, only very thin metal sheets can be cut. over, this can be done quite quickly and accurately along the cut line. Manual scissors, in turn, can be:
D) for curvilinear cutting.
With this tool, metal can be cut both in a straight line and in a curved line.
They allow you to perform high-quality cutting of metal sheets in a limited area of space. An electric motor is used to actuate the splined scissors.
When cutting metal with such scissors, it is provided:
A) the absence of defects;
B) maintaining the outer coating of the material being cut;
C) high precision cutting.
Guillotine shears have an oblique knife moving in the same plane.
With their help, a direct transverse or longitudinal cutting of plates and strips of metal can be carried out. The fact that when performing the cut the guillotine shears exert pressure on the material being cut at an angle reduces the force applied in this case.
Choosing and using a hacksaw
Although the force decreases significantly with an increase in the angle of inclination, it also reduces the quality of the cut.
Guillotine shears can be:
C) with a hydraulic actuator.
Manual Guillotine Shears
The disadvantage of such scissors is the inability to cut sufficiently strong metal with their help.
Mechanical guillotine shears
Thanks to the use of an electric motor in their design, the performance of mechanical shears is much higher than that provided by a manual type of guillotine.
Hydraulic Guillotine Shears
They provide high precision cutting of metal.
Such scissors are often equipped with CNC, as a result of which their productivity increases, since the typical values of the cut parameters are stored in the memory of such equipment “stuffed” with electronics.
Such a saw by its principle of operation is similar to a jigsaw, and in appearance resembles an electric drill with an elongated saw, having a length of 100. 350 mm and moving back and forth.
Both reciprocating saws are powered from the mains, and cordless.
Saw blades, which are easy to change like drill drills, are made of several types to ensure the performance of various works.
Knowing what and how to saw, you can choose the right saw blade. If cutting is carried out along a small radius, then it is necessary to choose a narrow blade. Effectively use a reciprocating saw can only those who have the appropriate skills and a good eye.
It is a little easier to work with such a saw than a saber saw.
The cutting disks for it are made of carbide high-alloy steel grades or a special high-speed steel is used for these purposes, which is a type of tool steels and has high resistance to destruction, both in cold and in hot condition.
Circular saws designed for cutting various metal profiles can make narrow cuts, while creating a small amount of chips.
When choosing a saw, it must be borne in mind that the larger the diameter it has a cutting circle, the greater the number of varieties of work that can be performed with it.
After sawing, it is recommended to remove burrs and sharp edges. The disadvantages of circular saws are their high cost and quite large sizes.
Some people who are not very enlightened in the types of construction equipment think that they have never seen such a machine. But they just don’t know that the “angle grinder” they know is just the angle grinder. Equipped with a steel saw blade, the “angle grinder” successfully replaces the saw blade already discussed above, although it was originally designed as a grinding equipment.
With its help, you can cut, grind and polish almost any material without buying various tools to perform these operations.
Only the purchase of appropriate consumables is required.
Thermal methods of metal cutting
With this technology of cutting metal products, a high gas combustion temperature is used, but there is no need to use electric power sources, and the following types are distinguished:
Video: Hacksaw For Metal Toothed
With this cutting, the metal burns in oxygen, directed in the form of a jet, which, due to its pressure, removes the formed oxides.
In this case, the metal does not melt: it burns, remaining solid, as a result of which the cut-off frames are smooth.
Oxygen flux cutting
This technology of cutting metal involves the supply of flux in the form of a powder to the cutting region.
The cutting process is facilitated by the fact that the flux has a triple effect on it:
With this method of cutting metal, high temperature is ensured by the combustion of a special oxygen spear, which is a steel tube through which oxygen is supplied to the cutting zone.
The main advantages of gas cutting methods:
A) low cost;
B) the simplicity of the process;
C) it is possible to cut metal products of large thickness.
The main disadvantages of the gas cutting method:
A) low accuracy;
A) increased consumption of material;
C) additional processing of the edges of the cut is required;
D) low cutting speed;
D) thermal deformation of the processed products.
In this case, source of electricity is used.
Removing the melt formed in the working area is carried out using a gas jet. Gas-electric cutting can be of two types:
A) air-arc (in this case, the molten metal is removed using a stream of air supplied under high pressure);
B) an oxygen-arc (in this case, an oxygen jet is supplied, which causes combustion of the metal heated by the electric arc and blows out the formed oxides outside the cutting zone).
The main disadvantage of gas-electric cutting is the occurrence of carburization of the material in the work area, as a result of the combustion of carbon electrodes.
It is used mainly when necessary to eliminate defects present in welds.
Plasma cutting of metal
With this method, the cutting tool is created by a special device called a plasmatron, a plasma jet with a temperature of 5-30 thousand degrees.
There are two plasma cutting options:
1) using a high-temperature plasma jet (in this case, an arc is formed between the metal tip of the plasma torch and the end of the electrode, but the workpiece itself is not part of the electric circuit);
2) using plasma-arc cutting (an arc with this method arises between a non-combustible refractory steel electrode and the surface of the metal being cut).
Compared to gas cutting, the use of plasma for cutting metal gives a number of advantages, as it provides:
A) high cutting speed;
B) universality of application;
C) accurate high-quality cutting of metal products;
D) cutting metals without the need for expensive gases;
D) the ability to cut along a very curved contour;
E) higher environmental safety.
A) the complexity of the equipment and its maintenance;
B) the inability to cut products with a thickness exceeding 8-10 cm;
C) high noise level;
There are other thermal methods for cutting metals (for example, such as laser or cryogenic cutting), but they are not widely used due to the complexity and high cost of the equipment used.
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Manual bench hacksaw consists of a machine (frame) and a hacksaw blade.
At one end of the frame there is a fixed head with a shank and a handle, and at the other end there is a movable head with a tensioning screw and a nut (wing) for tensioning the web. Slots are made in the heads, into which a hacksaw blade is inserted and fixed with pins. Hacksaw frames are solid and sliding. In the sliding frames, the knee is bent until the rivet comes out of the cut and is displaced.
A rivet is inserted into another cut and the knee is straightened.
A machine with a movable holder is a square with a handle along which the holder can be moved and secured in the desired position.
Hacksaw blade. a thin and narrow steel plate with two holes and with teeth on one of the edges. Cloths are made of U10A and X6VF steels with Rockwell hardness HRCE 61. 64. The canvas is inserted into the frame with the teeth forward. Sizes of hacksaw blades:
- l = 250. 300mm;
- b = 13 and 16mm;
- h = 0.65 and 0.8mm.
The tooth of the hacksaw blade has the shape of a wedge (incisor) (Figure 6.4), which distinguishes between the rear angle α, the angle of sharpening β and the front angle γ, where αβγ = 90
Figure 6.4. Elements of the tooth of a hacksaw blade (a); positive rake angle of the tooth (b), zero (c) and negative (d)
Sawing of metals.
The workpiece is cleaned with metal brushes of dirt, oil, molding earth, scale, clamped horizontally in a vice with a sawed surface, 8.10 mm above the level of the jaws.
Hacksaws for metal and wood
The workpiece with the treated surfaces is fixed by putting on the lips a mouthpiece made of soft material (copper, brass, aluminum, mild steel) (Figure 7.4).
Figure 7.4. The position of the hands (a), body (b) and legs (c) when filing
The body of the worker should be straight, deployed at 45˚ to the line of the axis of the vise; the angle between the shoulder and ulnar parts of the right hand bent at the elbow with a file mounted on the jaws of a vice forms 90 °.
The left leg is extended (retracted) forward in the direction of the file, the right leg is 200.300 mm away from the left so that the middle of its foot is against the heel of the left leg.
During the working stroke of the file, the main load on the left leg, with a single on the right. When fine-tuning and finishing the workpiece, the pressure on the file is weak, the feet are almost next to each other or they perform work while sitting. The position of the hands (file grip) is important when working. With their right hand, they take the file handle so that the handle rests on the palm of the hand, four fingers grab the handle from the bottom, and the thumb was placed on top.
The palm of the left hand is placed slightly across the file at a distance of 20.30 mm from its toe, while the fingers are slightly bent, but do not hang down. The elbow of the left hand is slightly raised. The right hand from the elbow to the hand makes a straight line with a file. When filing during the working stroke, the pressure increases with the right hand while reducing the pressure with the left, to avoid blockage of the surface. During the reverse stroke, the file is not torn off from the surface to be treated. The coarser the work, the greater should be the force during the working stroke.
First, the filing is performed from left to right at an angle of 30.40˚ to the axis of the vice, then, without interrupting the work, with a straight stroke and the filing is completed with an oblique stroke at the same angle, but from right to left.
The sawn surface is monitored with a straightedge for clearance or, in a careful case, with a calibration plate for paint.
The parallelism of 2 surfaces is checked with a caliper.
Types of filing
In the practice of manual processing of metals, the following types of filing are encountered: filing of planes, parallel and perpendicular surfaces of parts, curved (convex or concave) surfaces, as well as sawing and fitting of surfaces.
Sawing of external flat surfaces
Sawing of squares of a square located at right angles
Depending on the shape of the workpieces and parts, the following types of filing are used:
-filing the end of the rod per square;
-filing of cylindrical workpieces;
-filing concave and convex (curved) surfaces;
-filing thin plates;
-filed in sliding frames;
-filing in a universal basting;
-filing in plane-parallel basting;
-filing along the contour (conductor).
File. a multi-blade tool for removing small layers of metal is a steel bar of a certain profile and length, on the surface of which there are notches (cuts) forming hollows and sharpened teeth (teeth) having a wedge shape in cross section.
Files are made of steel U10A, U13A or alloy steel ShH15, 13X. After applying notches to the files, they are subjected to heat treatment (hardening), (Figure 7.1).
Sawing allowances are 0.5.0.025 mm, and processing accuracy reaches 0.2.0.05 mm and, in some cases, up to 0.005 mm. Files are divided by the size of the notch, its shape, the length and shape of the bar.
General-purpose locksmith file: 1-toe, 2-working part, 3-notched section, 4-shoulder, 5-shank, 6-wide side, 7-edges, 8-narrow side
Using the teeth, files are cut off the chips from the processed material. The teeth are obtained on saw-cutting machines with special chisels, on milling-milling cutters, on grinding-special grinding wheels, by rolling, pulling on broaching machines and on gear-cutting machines.
Each tooth has a trailing angle α, a sharpening angle β, and a rake angle γ (Figure 7.2)
File teeth: a-notched, b-obtained by milling or grinding, c-obtained by pulling.
For files with notched teeth, γ =.12.-15˚ (negative angle); α = 35.40˚; β = 62. 70˚, which provides a sufficiently large space for chip placement.
For files with teeth obtained by milling or grinding, γ = 2.10˚, α = 25˚, β = 35. 65˚.
For files with teeth obtained by pulling, γ =.5 ˚; β = 55 ˚; α = 40 таких. Such teeth have a hollow with a flat bottom.
These teeth cut better into the metal being processed, labor productivity increases and they are more resistant, because Do not clog with chips.
The fewer notches per 1 cm of file length, the larger the tooth.
The notch can be single (simple), double (cross), rasp (point) or arc. Single-cut files remove wide chips equal to the length of the entire notch.
They are used for filing soft metals. Double-cut files are used for sawing steel, cast iron and other hard materials, since a cross-cut cuts the chips, making it easier to work. The lower main deeper notch at an angle α = 25˚, the upper (auxiliary) at an angle β = 45 ˚ cuts the main notch into a large number of individual teeth. Cross cutting cuts down chips more easily, making work easier. Files with a rasp cut, which have large recesses between the teeth, which contribute to better chip placement, process very soft metals and non-metallic materials.
Files with an arc notch have large hollows between the teeth, which ensures high productivity and good quality of the processed surfaces.
Files are divided by the purpose of the following groups: general purpose, special purpose, files, rasps, machine files. For general metalwork, general purpose files are used.
According to the number of notches per 1 cm of length, they are divided into 6 numbers. Files with notch No. 0 and 1 (drachevy) have the largest teeth and are used for rough (rough) filing with an accuracy of 0.5. 0.2 mm.
Files with notches No. 2 and 3 (personal) are used for finishing filing parts with an accuracy of 0.15.0.02 mm. Files with notches No. 4 and 5 (velvet) are used for the final accurate finishing of products. Achieved processing accuracy of 0.01.0.005 mm. File lengths can be 100.400 mm.
According to the cross-sectional shape, the tools are divided into flat, square, trihedral, round, semicircular, rhombic and hacksaw (Figure 7.3).
Types of files: a-flat, b-sharp, b-square, r-triangular, d-round, e-semicircular, g-rhombic, h-hacksaw.
Flat They are used for filing external and internal flat surfaces, sawing splines and grooves.
Square- for sawing square, rectangular and polygonal holes, sawing narrow flat surfaces. Trihedral for filing sharp angles equal to 60 ˚ or more, for sharpening saws on wood. Round- for sawing round and oval holes, concave surfaces of a small radius. Semicircular with segmented sections. for processing concave curved surfaces of significant radius and large holes (convex edge), convex curved surfaces and angles of more than 30 ˚ (flat side).Rhombic for filing teeth of gears, discs and sprockets, for deburring, filing angles of more than 15 ˚.
Hacksaw for filing internal corners, wedge-shaped grooves, narrow grooves, in the manufacture of cutting tools and materials.
For processing small parts are small-sized files-files.
They are made in five numbers, with the number of notches per 1 cm of length up to 112. Processing of hardened steel and hard alloys is carried out with special needle files, on which grains of artificial diamond are fixed on a steel core.
Files for special purposes are made for processing non-ferrous alloys, products from light alloys and non-metallic materials, calibrated and diamond files. Special machine core files are made for filing machines with reciprocating motion and rotating files (velvet, disk and plate) are used for filing and cleaning surfaces on special filing machines.
File handles are made of wood (birch, maple, ash, linden) or pressed paper.
So that the handle does not crack, a steel ring is mounted on its end. In addition to conventional handles, universal, quick-change, durable wooden ones screwed onto the shank, file handles with cylindrical shanks and handles for fixing files are used.
The files require careful care:
-protect from shock damaging the teeth;
-store on wooden supports, excluding their contact;
-protect from oil and sand dust;
-to protect against clogging with soft metal chips before rubbing with chalk;
-Before filing workpieces, remove rust from them with metal brushes;
-Do not process materials whose hardness is equal to or more than the hardness of the file material;
-use files as intended;
-new files should first process soft metals, and after some blunting, hard metals, which increases their service life);
-periodically clean files from chips by tapping the sock on the workbench and with a cord brush, moving it along the notch;
-Wash heavily oiled files with kerosene or gasoline.
For a particular job, choose the type of file, its length and the number of notches.
The file must be 150 mm longer than the size of the surface to be treated. For filing thin plates of fitting and finishing work, short files with a fine notch are taken. When removing a large allowance, work with files with a length of 300.400.mm with a large notch.
Bending of metals. Types of bending
Bending. the processing of metals by pressure, in which the workpiece is given a curved shape.
Varieties of bending. profiling (corrugation), convolution (manufacturing of welded pipes), winding springs, dressing.
Bending of parts, one of the most common technological operations, can be carried out manually on the support tool and mandrels and on bending machines, presses.
During bending, one part of the workpiece is bent with respect to the other by a given angle. Bending force causes bending stresses in the workpiece. If these stresses do not exceed the elastic limit of the bent material, the deformation in the workpiece will be elastic and after removing the load, the workpiece takes its original form (straightens).
In order for the workpiece to retain its shape after unloading, bending stresses must exceed the elastic limit. In this case, plastic deformation occurs: the outer layers are stretched and lengthened, the inner layers of the workpiece are compressed and shortened, and the middle layer of the workpiece (neutral zone) does not experience compression or expansion, its length remains constant.
The outer and inner surface layers of the workpiece are most subjected to tension and compression (Figure 8.1).
The length of the workpiece is calculated from the neutral layer.
24.Tools and tools for bending metals
Thin sheet metal is bent with mallet.
When bending sheet metal with a thickness of 0.5 mm, strip and bar material up to 6.0 mm thick, steel bench hammers with square and round strikers weighing from 500 to 1000 g are used (hammers with soft strikers or with
Figure 8.9. Bending blanks using a bending stamp
soft inserts) in a vice, on a plate or by means of special devices.
Wire with a diameter of up to 3 mm is bent with pliers or round-nose pliers.
The choice of tool depends on the material of the workpiece, the dimensions of its cross section and the design of the part that should result from bending.
Hammers with soft inserts and wooden hammers. mallet. are used for bending sheet metal up to 0.5 mm thick, non-ferrous metal blanks and pre-processed blanks.
Bending is carried out in a vice with the use of mandrels and overlays (on the jaws of a vice) of soft material.
Flat-nose pliers and round-nose pliers are used when bending profile steel with a thickness of less than 0.5 mm and wire. Pliers designed
for gripping and holding workpieces during bending. They have a slot near the hinge.
The presence of a slot allows you to bite off the wire. The round-nose pliers also provide for gripping and holding the workpiece during the bending process and, in addition, allow bending of the wire.
Figure 8.10. Tool for bending the frame of a hacksaw
Frame saw blades (made of metal or composite materials) must be checked for stability before you choose. by force, try to bend and find out if the skeleton is hidden if there is no backfill in the parts or the structure is firmly installed. During such procedures, cheap and brittle plastics that stop during storage or during inaccuracy can be recognized and discarded.
Video: How to make a saw for wood and metal, universal, manual, own hands
In different models length of used fabric It can be from 20 cm to half a meter.
Accordingly, the larger the thick tube should burn.
Canvas for metal wire. how to distinguish quality?
For working in hidden conditions, it is advisable to use saw blades with sliding frames that change their length (the tool can be installed on the selected fabric).
Fabric Attachment System it can be based on a threaded clamp (in case of tension, the fabric is fixed with a wing nut) or a special mechanical lever.
Saws of this type are more expensive, but they are more suitable for operation and maintenance. Some models may have Tilt adjustment function, which allows you to produce pieces of more complex shapes. In addition, you can rotate the blade 90 °, which allows you to view the entire sheet of material, which is not limited by the height of the saw blade.
Video: saw blade specifications
They may have scaffolding. 18, 24 and 32 teeth. The more they are, the faster and cleaner the saw will be.
tissue they are bimetallic and hot teeth. The first is the best and lasting. The quality of the saws can be checked by a slight bend: a worthy product immediately restores its shape, and the plate remains bent or cracked.
Video: How did you see the 21st century metal wire in the courtyard?
Types and purpose of hacksaws
A hacksaw is a tool that is useful in many domestic situations. It is easy for them to saw wooden slats and thin metal planks. All hacksaws are divided into electric and manual.
When transporting them, you must comply with safety rules so as not to injure or damage tools.
If you go to www.biznet.ru, you can find out in detail the nuances of such transportation.
It is inconvenient to use an electric tool on the garden plot, since the work will be limited by the length of the electric cord or its absence at all.
Therefore, a hand saw is the best choice for repair work in a country house. The hand saw is lightweight and easy to use.
Using a hacksaw, you can saw off unnecessary tree branches, make a fence, build a barn, a summer shower and veneer the interior of the cottage.
According to the purpose of the hacksaw there are two types: wood and metal.
A hacksaw for wood, respectively, is used in work related to the processing and preparation of logs and sawing boards, laminate and chipboards. Such a hacksaw becomes indispensable when laying a wooden floor, repairing furniture. Hacksaws for wood can have large, medium and small canvases, with different frequencies and the number of teeth.
Large canvases are used in sawing logs or whetstones.
Small hacksaws are suitable for decorative woodwork. The arrangement of the teeth on the canvas also makes some sense. So, a hacksaw with straight teeth is designed for transverse cutting, and for a longitudinal one. you need a saw with teeth tilted forward.
The hacksaw for metal differs not only externally, but also by the principle of operation. As a working part there is a thin canvas. Such a tool must be held with both hands. The material of the canvas is selected for the cut type of metal alloy.
Such a tool can be used in work with ceramics, plastic and wood, so it is considered universal.