Every self-respecting person who in one way or another considers himself a member of the construction fraternity has his own construction knife with replaceable blades. It can be useful in any situation, be it opening a bag of putty or cutting a sheet.
How to choose a knife?
To assembly knife with replaceable blades served faithfully; you must initially select it according to correct parameters, which, however, everyone sets for himself. Here's what to look for when purchasing:
- The most important thing is that the retractable mechanism in a construction knife must work perfectly. After all, the speed and coherence of the work process often depends on this;
- construction knives with a retractable blade must be without various “bells and whistles” in order to perform the simplest function - cutting;
- the weight of the knife is great importance– the lighter it is, the more convenient it is to carry it with you, putting it in your trouser pocket.
You should pay attention to the knife slider - if it is plastic and has a rather dubious appearance, then most likely it is not a construction knife, but a stationery knife, which is not suitable for applying force. Due to the pressure, the mechanism breaks down very quickly and stops fixing the blade.
A knife with a plastic wheel is better if you don’t clamp it too hard. After all, if you tighten it once, you simply won’t be able to unscrew it the second time, and you can safely throw away the knife.
The most durable of those presented in construction stores knives for construction work are those that are equipped with a metal wheel and the knife itself is also made of metal. But when purchasing, you should be careful not to accidentally purchase a knife made of mild steel, but a stainless steel one will be just right.
The most popular is a knife with replaceable blades measuring 25 mm - it is quite powerful and suitable for most jobs. But the blades for a construction knife 18 mm are thinner and are suitable only for small work– sharpening a pencil or cutting wallpaper.
Surprisingly, the knife is not used exclusively in the kitchen, and not exclusively by a housewife. A builder needs such a device no less than a hunter, and it can be useful in any field of application. Therefore, in this publication we will discuss atypical hand tool builder
Types of knives
In the construction industry, knives are used that have special blades sharpened to professional conditions for those purposes so that they do not become dull so quickly from interaction with hard building materials. They can be divided into universal and marking devices.
Let's start with the marking devices. The name of the type corresponds to the specifics of the application, that is, such a tool is designed to determine the installation line. The work of this type of device is especially active when laying linoleum. main feature marking tools lies in the cutting element. The cutting part in such devices is sharpened exclusively on one side, which is why the tool can be freely pressed, for example, against a ruler, and markings can be made along the plane.
The universal type is used everywhere, which corresponds to the name. Such a device can cut absolutely any type of building material: foam plastic, cardboard, wallpaper, linoleum, etc. Such a tool has the inherent property of mobility, since it contains spare blades that can be brought into action at any time. For example, when the edge becomes dull, the next one is immediately put forward to replace it.
The permanent location of a hand-held cutting device is most often a narrow pocket of work overalls, a belt pouch, or a special sheath that is hung on the lower back or leg. We’ll talk about the sheath below, and we’ll explain the question about the leg on which the available products are stored in working order now. The very name “knife” in Russian comes naturally from the word noga. The reason is that the cutter was stored in the top of the boot so that it would not get lost, would not interfere, and could not cut through something through negligence. And even today, many specialists, for example, submariners and people who cut livestock, put this type of device in a sheath suspended on the boot.
The requirements for a knife include, first of all, reliability, consisting of strength and sharpness. The most reliable cutting tool is a solid continuation of the handle and blade, which prolong each other. Many people use folding devices, which, under increased loads, especially on fracture, lose strength at the most crucial moments.
Construction devices with retractable cutting parts do not differ much from each other in many respects. Almost their only and main difference is the mechanism that fixes the sharpened metal. The locking mechanism in the product in question is a clamping wheel, which is tightened after the cutting element is extended to the required length. The unreliability of such devices lies in the plastic handle, which does not last long. It doesn’t make sense to change it, and it’s often just a shame to throw away products. Exactly typical reason is that such products are not recommended for use for basic work, only for sharpening marking pencils, opening bags with bulk material or for cutting mosaic sheets.
The cost of the products discussed above varies in different price categories. For example, a product with spare cutting elements and a three-component handle from the manufacturer GROSS can be purchased at a price of 540 rubles. A construction auxiliary device from Stanley Interlock will cost 256 rubles, and from Haupa – from 702 rubles. The cost of a replacement cutting element ranges from 15 to 99 rubles per piece from manufacturers such as Sparta, GROSS.
A knife, the handle of which is an extension of the blade, from the manufacturer Fiskars in the retail network can cost 360 rubles. Moreover, it will be more reliable assistant than devices with moving devices. We’ll talk about reliability, the material used in manufacturing and much more in the next section.
Raw materials used for making knives
In an auxiliary product, the main thing is the sharpness of the cutting element, and this indicator depends on the quality of the raw materials used in large-scale production. The cutting component should be neither soft (bend in all directions) nor brittle (break when cutting).
Many manufacturing companies make blades from heat-resistant valve steel. More often, saw blades are used for production, which are intended for metal cutting. The average size of such blanks is 25-30 centimeters and the thickness of the canvas is approximately 2 mm. Product in finished form has approximate dimensions: length of the sharpened part – approximately 15 cm; handle length is 10-12 centimeters.
The handles can have a wide variety of configurations, but the material is used with fairly high strength indicators. For example, there are holders made of ebonite, textolite, most often they use wood blanks from birch or rowan. Can with my own hands make a mold for casting a handle, in which to place the blade blank and fill it with a mixture of powder used by electricians when sealing high-voltage cable reconnecting couplings.
As a rule, the holder consists of two plates, which are drilled only after appropriate markings. In this case, both halves must be superimposed on each other, and the connecting holes must run through the holes in the metal blank of the future cutting element. The diameter of the holes in all components must be the same.
The three components are secured using rivets, which are made from aluminum wire. This type of wire is used by electricians during the installation process. air lines. It is also possible to use copper wire, as long as its diameter is slightly smaller drilled holes in the plates of the handle and the metal of the workpiece so that it fits freely into them. In this case, the wire should not dangle freely.
On one side, the wire is riveted, and a kind of “fungus” is obtained. Then the length of the segment is measured, somewhat larger than the thickness of the cutter handle, cut off and threaded through the holes, placed on the anvil and the second side is riveted. It is advisable to process the resulting rivets on both sides sandpaper. Rivets can oxidize during prolonged interaction, for example, with water or another aggressive environment.
If the metal plate has a single hole, then one rivet is made at the end of the handle. The second rivet can be replaced by a copper or brass shell from a pipe of the required diameter. The shell is flattened at the junction of the handle and metal blank, in accordance with the original shape of the handle, carefully processed and polished. To prevent displacement of the shell, from the side metal plate As an addition, a strip of the same type of metal is placed across it.
We touched upon the issue of sheaths in which to carry and store hand tool. It is safer to use a case, which should be placed in one specific place, so as not to lose or search for a long time for a hand tool at the most necessary moment. Homemade cases made of metal, leather or wood are often used. The only condition for storing the device in a case concerns the contact of the cutting metal part with internal surfaces. That is, the knife should be clamped exclusively on the side surfaces.
Let us add that it is advisable to sharpen the active metal part on a special device-machine. When processing yourself, try to start the process with a rough impact, for example, on a sharpener with a coarse grain with an abrasive wheel. Next, move on to wheels with finer grit. Finishing should be done with sandpaper, canvas straps, and then leather. Observe the sharpening angle, which should be about 15 degrees (+ - error of several degrees). Of course, the sharpness of the tool will be tested by practice, but do not forget to cool the blade with water during the sharpening process, especially when using a sharpener.
Or it is also called stationery - this is a real find. After all, it is practical and needed everywhere: by needlewomen, designers, builders, repairmen household appliances etc. Initially, as soon as such a knife was developed, it was intended for cutting paper, but very soon its scope of application expanded significantly. Now a construction knife is used for cutting cardboard, paper, foam plastic, leather, thin plastic, for stripping wires and the like.
Today, there are many different variations of knives on the market, but among specialists there are two main types and they are divided according to two parameters:
According to the material from which the body is made.
Why according to these parameters? The answer is simple; it is these two parameters that you pay most attention to when choosing a construction knife.
- knife with 18 mm blade.
At repair work They use a knife with a blade width of 18 mm, which is called a construction knife. The remaining two types are used more for home or design work.
Construction knife is very popular, and every specialist has it in his bag. And this is not without reason, because a construction knife has a number of advantages that you need to know about:
Versatility and wide scope of application;
Does not require sharpening, as most knives have a blade that breaks off, and in those knives where the blade cannot be broken off, it is simply replaced with a new and sharp one;
Safety in use. has a special lock on the body that securely holds the blades in the installed position. In addition, you can adjust the length yourself.
What to look for when buying a construction knife:
We decide on the body material;
It is imperative that the knife fits well and comfortably in the hand;
It is better to choose a knife with metal fasteners and buttons for adjusting the blade, since plastic is not very durable, especially if the knife is used for repair work;
Pay attention to the quality of the blade; it is advisable that it be made of high-quality stainless steel.
By affordable price available in the Master Plus online store. We work for you! Enjoy the shopping!
The concept of “installation knife” includes a set of tools designed to perform their main function in the technical and construction fields. Among this line there are specific designs, as well as universal tools.
Specially designed knives are designed to do a specific job and are not suitable for other purposes. An example would be an electrical knife with a heel. Universal types, as a rule, are used in a wide range of jobs and even for household purposes.
The main difference between an assembly knife and a household knife is its technical suitability for performing installation and construction tasks, ease and speed of use in a given area.
Types of assembly knives
All knives industrial purposes can be divided into two broad categories:
- Construction and installation
- Electrical knives.
Modern construction knives are designed with removable, replaceable blades. The cutting part is also segmented with the possibility of breaking off segments. This technical solution allows you to avoid wasting time on sharpening the cutting blade and get the job done extremely quickly. The handle of the mounting knife of professional models has rubber linings for better fixation of the tool in the hand. The knife can be stored in a workwear pocket while working, as it has the function of hiding the blade in the handle.
Electrical installation knives consist of a handle and a steel, irreplaceable blade. They are different types to perform certain operations and work:
- Cable knife. Has a straight, shortened blade, often covered to the level of the cutting edge insulating material. Apply this
- Electrical knife with heel. The blade is curved like a beak. At the end it has a welded element in the form of an oval heel. This knife is used for removing primary insulation from multi-core cables. Its design does not allow the wire insulation in the bundle to be damaged.
- Universal mounting knife. Folding knife design similar to a penknife. In addition to different blades for removing insulation, it also has an awl and screwdriver tab. Designed to work with de-energized wires.
What can you do with a mounting knife?
The applicability of a construction knife is very wide. In addition to the usual operations of cutting ropes, fabric, hoses, wires, and sharpening pencils, he can:
- Cut drywall. Thanks to the durable and sharp blade soft plaster and thick cardboard are easily cut and broken at the cut site.
- Cut linoleum and carpet. Convenient not only for cutting flooring into pieces, but also to make figured cuts and adjust in hard-to-reach places.
- Knife polyurethane foam removes excess easily and quickly.
- Working with foam plastic mineral wool and other insulating materials.
- Act as a wallpaper knife.
- Cut film, both regular and all types of waterproofing and vapor barrier materials.
The scope of application of the electrical installation knife is limited by the energy sector and voltage tolerances. Typically, the insulation of professional cutting tools can withstand up to 380 V and up to 200 amps.
Another type of cutting tool technical purpose is a mounting scalpel knife. This device also has a handle and blade, but they are entirely made of high-grade tool steel. Scalpels of this type are designed to work with electronic circuits, or rather the repair of components and blocks. They are also used to trim current-carrying tracks on a printed circuit board.
How to choose a good mounting knife?
A high-quality construction tool has the following characteristics:
- The presence of a strong handle equipped with rubber pads or a textured surface for ease of holding in the hand.
- The presence of a mechanism for rigid fixation of the blade.
- Blade guide made of durable steel. If a segment of the blade breaks, the guide should not be deformed.
- Convenient system for changing the cutting element.
If you extend the knife blade halfway and, pressing on the handle, make a cut, the blade should not move upward much, but should be in line with the handle.
The professional electrician's assembly knife has a solid dielectric handle without any metal inserts. The voltage limit may be indicated on it, or this limit must be in technical specifications products. The knife is sold initially sharpened, and the steel marking is sometimes indicated on it. On modern good models there is a blade protection cover. The blade should not have any nicks or burrs.
Caring for a professional knife
A construction knife does not require sharpening, but it still needs care. It consists of removing particles building materials, dust and dirt from the blade extension system. It is also advisable to change on time cutting elements, which began to rust in order to prevent corrosion of the guide. Otherwise a rusty tool expensive wallpaper cutting is risky. In general, it is not advisable to hide the wet blade of a mounting knife in the handle.
An electrical knife, on the contrary, requires periodic sharpening. It is better not to allow the blade to become seriously dull and to bring it down after each extensive work. During the sharpening process, you cannot change the bevel angle of the blade. The tool should only be stored with the protective casing. To prevent the knife from rusting, it should always be coated with machine oil.
Conclusion
Three rules for choosing a quality tool, including a mounting knife:
- Professionalism. An expert in his field knows what tool he needs for his job.
- Observation. Anyone who values strength and energy will not use an inconvenient tool.
- Generosity. Those who strive to develop their business are always ahead and spare no expense for the most best technologies and tool.
Every self-respecting person, who in one way or another considers himself a member of the construction fraternity, has his own construction knife with interchangeable blades. It can be useful in any situation, be it opening a bag of putty or cutting a sheet.
How to choose a knife?
In order for a mounting knife with replaceable blades to serve faithfully, you must initially select it according to the correct parameters, which, however, everyone sets for themselves. Here's what to look for when purchasing:
Advantages of this type of knife blade
Thanks to the long blade, they can be used very flexibly, for example cutting even thicker materials such as foam. The blade is fixed in the appropriate position that they need to certain works such as removing cables.
The disadvantages of incisors are
In the event of lateral forces, the blade can break very quickly and injuries can occur. Because the blade does not retract into the body, in practice there are many accidents where users move with the blade free-standing or leave it extended. By simply breaking the front segment, you can trim the blade quickly and conveniently. . While some of the cutters are also known as carpet knives, a carpet knife is always equipped with a trapezoidal blade or hook.- The most important thing is that the retractable mechanism in a construction knife must work perfectly. After all, the speed and coherence of the work process often depends on this;
- construction knives with a retractable blade must be without various “bells and whistles” in order to perform the simplest function - cutting;
- The weight of the knife is of great importance - the lighter it is, the more convenient it is to carry it with you, putting it in your trouser pocket.
You should pay attention to the knife slider - if it is plastic and has a rather dubious appearance, then most likely it is not a construction knife, but a stationery knife, which is not suitable for applying force. Due to the pressure, the mechanism breaks down very quickly and stops fixing the blade.
The switches are too quickly uncontrollable when the lateral forces are too high, so these cutters are not suitable for heavy cutting. Thus, a carpet knife has a replaceable trapezoidal blade or hook blade. Duden defines a carpet knife as a knife with a replaceable blade.
Disadvantages of Hook Guard Cutters
Maximize the safety of your sales and/or production goods from damage caused by the blade. Cutting with shearing knives should only be done 1-2 times as they must be guided under right angle to the cutting material. Since you are only cutting a very small area of the blade, only that area is worn out and the blade needs to be replaced more often. For example, a carpet knife with a trapezoidal blade.
- Maximum safety for the user from any cuts.
- Only one knife for all activities.
- The blades feel faster.
A knife with a plastic wheel is better if you don’t clamp it too hard. After all, if you tighten it once, you simply won’t be able to unscrew it the second time, and you can safely throw away the knife.
The most durable knives for construction work presented in hardware stores are those that are equipped with a metal wheel and the knife itself is also made of metal. But when purchasing, you should be careful not to accidentally purchase a knife made of mild steel, but a stainless steel one will be just right.
All functions of knives can be found. An essential feature of scalpels is their very thin handle, which resembles a pencil. Therefore, scalpels are especially suitable for precise cuts. Another feature is very varied selection various forms blades.
In addition to the medical sector, the scalpel is also used as a deburring machine in manufacturing factories. While the scalpel blade is optimized for maximum sharpness in the medical field with very short term service, replacement blades for the manufacturing industry are optimized for long service life with relatively high sharpness. The material used for the dial knob is generally stable aluminum, partially coated with a soft spatula.
The most popular is a knife with replaceable blades measuring 25 mm - it is quite powerful and suitable for most jobs. But the 18 mm blades for a construction knife are thinner and are only suitable for small work - sharpening a pencil or cutting wallpaper.
A construction knife is a useful tool for a wide range of tasks. With its help, you can strip cables of insulation, cut linoleum, wallpaper, carpeting or other materials. Of course, in order for the product to serve for a long time, fulfilling all the duties assigned to it, you need to approach the choice responsibly.
For medical scalpels, the blades are the same for all manufacturers. Unfortunately, however, you differed from manufacturer to manufacturer regarding the mounting or mounting of the knives. Scalpels for industry or hobby areas also have different perforations and, above all, strengths.
Advantages of scalpels
Therefore, you must make sure that these blades fit into your handle. Just send us a photo of your handle and your blade and we will be happy to advise you on the right choice.
The disadvantages of scalpels are
The risk of injury is very high since the blades are very sharp and the knives do not have safety mechanics. Heavy cutting work, such as cutting cardboard boxes cannot be done with a scalpel because the cutting edge breaks too quickly. You bought a toolbox, but you don't know what to put in it.Construction and office knives: a competent approach to purchasing
So, in addition to the price, the main attention should be paid to the following details:
- Design. A knife with a retractable blade is convenient for a wide range of jobs that do not require too much stress on the cutting part. A tool with a fixed blade will allow you to cut thick materials without the risk of breaking the blade. Specialized wallpaper knives require a ruler on the body for maximum precision.
- Blade features. The thicker the blade, the stronger it is. For products with retractable blades, it is considered mandatory to have segments that increase the operational period and increase operational safety.
- Overall quality. The handle must have rubber inserts for ease of use that prevent the tool from slipping, the locking mechanism must hold the blade firmly, and gaps are unacceptable. For greater durability on cutting edge sometimes a titanium coating is applied, which retains its sharpness for a long time even with permanent job with cardboard and other cellulose-based materials.
Construction knives in cases, retractable models - all this is presented in a wide range in the Leroy Merlin network. We cooperate exclusively with the best suppliers, and therefore all products are certified, durable and safe to use. Attentive and qualified sales consultants are always ready to help customers buy with delivery optimal model knife!
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