Every housewife at least once in her life faced with the fact that her knives were blunt in the kitchen, with which she usually cuts bread, butchers meat or cuts vegetables. Using such knives is not only inconvenient, but also dangerous, because the blade can break off the product and injure you. Therefore, it is necessary to periodically undermine the tool with the help of special devices. In stores, such devices are presented in a huge assortment, but for certain reasons they do not suit consumers. In such a situation, a do-it-yourself knife sharpener can be made. Drawings and diagrams for work are, in principle, easy to find, but detailed master classes we present in this article.
What conditions must be observed when sharpening knives?
Do you know how to sharpen knives properly? Actually, there is whole line rules, following which you can achieve the perfect result.
The necessary conditions look like this:
- For long and efficient operation of knives when sharpening, it is necessary to pay maximum attention to the angle between the edges of the blade. During sharpening, it is imperative to restore the initially set angle so that it meets technological standards and allows you to cut products quickly, efficiently, freely.
- It is necessary to choose the optimal angle for each blade. So, for example, a scalpel or razor should have an angle of 10-15 degrees, devices for cutting fruits, bread and vegetables - 15-20 degrees. Knives for working with hard materials need to be sharpened at an angle of 30-40 degrees.
- It is quite difficult to sharpen the blade without a special device. Holding the knife with your hands only, ensure desired angle tilt is difficult. So it is precisely to facilitate this process that there are sharpeners.
In fact, a do-it-yourself knife is made as easy as shelling pears, because all such devices have simple design And it won't take you long to create them.
Varieties and manufacture of stones for sharpening
Available for sale a large number of stones intended for turning knives, but the most popular of them are the following types:
- Water tools. Working with them necessarily involves the use of water, thereby saving the surface of the stones.
- Oil stone. It is very similar in shape and structure to water, the only difference is that its surface is a little oily.
- Natural stones. They are produced from natural materials, previously undergoing industrial processing.
- artificial tools. They are made from non-natural ingredients.
- rubber devices. They are no less common on sale, but working with them is extremely inconvenient.
Before you make a knife sharpener in the form of an abrasive bar, you need to purchase several rectangular glass plates 4-5 mm thick.
Then make the sharpener according to the scheme:
- Using double-sided tape, stick sandpaper of different grits on the surface of the plates.
- Tighten the nuts carefully so that the glass does not crack.
Important! During the operation of such a device, water is not used, which is why the abrasive wears out quickly enough.
When sharpening knives with an abrasive bar, too sharp movements should be avoided, otherwise it will overheat and the blade will lose its useful properties.
Products for sharpening knives made of wooden blocks
Making a sharpener from two abrasive and two wooden blocks is quite simple, the main thing is that the raw materials are the same size.
You will need to do the following:
- Carefully sand the wooden blocks with sandpaper, remove all burrs.
- Pre-mark the bars, taking into account the required angle of inclination.
- Attach a stone to the resulting line, mark its width on both sides of the wooden block.
- Make cuts according to the markings on the wooden workpiece.
Important! Make sure that their depth does not exceed 1.5 cm.
- Insert the abrasive stones into the recesses obtained so that they coincide with the grooves.
- Fasten the grindstones with bolts, attach a piece of rubber from below.
Do-it-yourself knife from mounting corners
Use this master class to get a high-quality do-it-yourself knife sharpener. Drawings can be taken on the Internet.
Tools and materials needed for work:
- Metal plates 4 by 11 cm.
- Aluminum corners standard size.
- Metal rods 15 cm long.
- Grinding machine with vise.
- Needle file.
- A set of bolts and nuts.
- File.
Make a sharpener according to these instructions:
- Make markings according to the drawing for the holes in the plates.
- Drill holes, cut threads.
- Round sharp edges and corners with a file.
- Make holes in the corner according to the diagram.
- Expand the needle support with a needle file.
- Cut the threads in the holes for the studs.
- Insert the rods into the extreme holes, fix them with nuts.
- Screw the bolt into the widest hole with the nut pre-threaded onto it.
- Insert bolts for clamping the knife into the remaining holes.
- Screw the nuts onto the ends of the rods, lay the corner on top to fix the nuts.
- Assemble a device to hold the sharpening stone from a thin metal rod, a wing nut and two holders.
Important! Such a sharpener can have the widest range of pressure angle degrees, it is incredibly convenient in terms of operation.
Making an electric knife sharpener at home
Do-it-yourself electric knife sharpener is made a little more complicated, because the device itself has a complex design.
Prepare the following materials and devices:
- Vacuum cleaner.
- Plan washer.
- Electrical engine.
- Stanin.
- Fencing.
Do the work, strictly following the scheme.
A knife sharpener is a must have in every home. Of course you can buy grinding machine industrial production. But it should be borne in mind: knife sharpeners, which are sold in specialized stores, are quite expensive and often fail.
Build a simple grinder you can do it yourself. This sharpener does not take up much space, and it is very easy to use. If there is no desire to make something, you can use the usual whetstone. However, a knife sharpening machine is all the same great idea, after all the simplest machine always useful, and you can sharpen other tools on it.
Why do knives get dull
Some houses have knives remain sharp for a long time, and the need for sharpening does not arise. And for some owners, on the contrary, they get dull every now and then. Why is this happening? Here are the most common reasons:
Do-it-yourself machine
Once upon a time, grinders were a rarity. When a grinder came to a village or city, all the locals brought him their knives, scissors and other cutting tools. In those days, the machine was a circle on which a knife was placed in a horizontal plane. The circle turned and the blade sharpened.
Until now, many owners who take care of their knives sharpen these items in a horizontal position, using a special bar. It is made of abrasive material, and the blade, in contact with the bar, restores its sharpness. If not grinder, this method can be used. However, sharpening knives in a horizontal position is very inconvenient, especially if you do it on weight. In this regard, many home craftsmen make their own grinding machines. Here are the main advantages of such a machine:
The principle of operation of the device
Here is how the simplest grinder works:
For sharpening on such a machine, no physical effort is required, and good result achieved very quickly. The risk of injury to the hand is reduced to zero.
When the blades are sharpened, the question arises of how to properly use and store them. Many housewives, after washing the knives, do not wipe them dry with a towel, but simply put them in a pile in the dish dryer so that water comes off the cutting tools. Under no circumstances should you do this. When not dried, wet knives are laid on top of each other in a horizontal position, they quickly rust and become dull.
Therefore, together with a grinding machine, it makes sense to design special device for storing knives. Such a device is wooden rack, in which cuts of various sizes are made. Blades are inserted into these slots with the blade down. Thus, the cutting tools do not come into contact with each other, and the blades are always dry. In order to remove the knife from the “nest”, you just need to gently pull on its handle.
Proper use of knives
Of course, sharpening knives on homemade machine- pure pleasure. It's nice to see how a dull blade becomes sharp and begins to shine. However, no one likes to do extra work. Therefore, in order to sharpen them less often, they need to be properly looked after. Here are some helpful tips:
The sharpness of kitchen appliances largely depends not only on the quality of the product and the metal from which the blades are made, but also on storage conditions. Even the most good knife will quickly rust if kept constantly in water and stored horizontally with other kitchen utensils.
Proper sharpening of knives is of great importance. ie in everyday life. When the blade is well sharpened, it is easy and pleasant to work with it. But the main thing is that it is much more difficult to injure yourself with a sharp knife than with a blunt one. Sharpening knives on a homemade machine will not take much time and effort, but after that the cutting tools will become as good as new. Sometimes homemade grinders are used even in cafes and restaurants to make the work of cooks easier. But you can use the usual bar, because it all depends on the desire and possibilities.
In households, it is often necessary to use cutting, sawing and planing tools. In the process of work, they lose their sharpness, and the blade needs to be restored to its original properties.
Taking tools to workshops to be sharpened is a reasonable option, but in order not to waste once again money, you can make a device for sharpening knives with your own hands.
General information about knife sharpening
The goal of any kind of knife sharpening is to keep the blade sharp. And most important factor, which affects long-term and efficient operation - this is the value of the sharpening angle. The practicality of such a parameter is well evaluated in the course of work. If you look objectively, you can see that with a smaller value of the angle, the knife blade as a result is sharper. But with such an action, it turns out that the period of improved cutting qualities is not very long, that is, it becomes dull faster. The sharper a knife blade becomes during the sharpening process, the faster it will become blunt. On the basis of this regularity, it can be concluded that the angle must be chosen correctly and the false value should be observed uniformly along the entire length of the edge.
It should be noted that only those types of blades that have a certain degree of hardening are subject to sharpening. If the hardness of the steel on the cutting parts exceeds 55 HRC, then it cannot be sharpened with any improvised tool.
The golden rule for sharpening knives is to keep the sharpening angle of the cutting edge unchanged throughout its entire length.
To achieve this, professionalism, skills and special equipment are required, which will allow you to hold the tool in your hands, maintaining a given angle of inclination of each cutting edge.
In this case, you can take care of buying a special device, but such products are usually expensive, so you can try to make it yourself. For more information on how to make such a device at home, read below.
Video "Homemade design of a simple knife sharpener"
Features of using the device
Of course, a simple whetstone is fine for sharpening a knife or planer cutting edge. But its quality will not be the best. To ensure uniform removal of the metal layer and the accuracy of processing, it is necessary to use special grinding devices.
The advantage of such a product is not only the convenience of its use, but also factors such as:
- The possibility of fixing the blades, which is quite reliable and does not exert excessive load. a properly designed device does not allow damage to the metal during operation.
- The ability to install the bar at a certain angle. Due to this, when the cutting edge moves, the angle value will not change.
- Variation of installation of different angles of sharpening. With this functionality, it is possible to process various tools, even sharpening knives with a stepped structure.
Materials and tools required for the device
To perform a simple and quite solid fixture, you need to take care of preparing the following blanks and tools:
- plywood or a small laminated chipboard sheet;
- steel stud with a diameter of 8 mm (the thread on it must be cut along the entire length);
- textolite or ebonite bar (alternatively, you can replace hard rocks wood - beech, oak, etc.);
- aluminum plate (with a thickness of at least 5 mm);
- fasteners - bolts, nuts (wing nuts);
- neodymium magnet (it can be found on an old computer HDD).
Do-it-yourself drawings of a tool for sharpening knives
After preparing and completing the materials, you can begin the process of assembling the fixture. First of all, we take plywood to be used as a bed, which should rest on the mounting legs at a certain angle in the range from 15 to 20 degrees. After that, the hairpin prepared by us is twisted into the lower part, its length should be approximately 35-40 cm. To make the fitting thread stronger, you can use glue or sealant.
In the center of the installed plywood, we fasten the aluminum plate. Before fastening it, it is necessary to make a groove, which in size will correspond to the diameter of the fixing bolts. It is worth noting that we are using an aluminum blade as this will help avoid damage to the steel blade of the knife.
After that, we proceed to the manufacture of a lever that will allow you to fix the emery on the device. To assemble it, use the rest of the stud. Then we take two textolite (or wooden) bars and by cutting out we make holders for the lever. On one side, the stops must be fixed with a wing nut.
Near the handle, it is optimal to provide for the presence of a spring-loaded block, which will allow you to quickly change the emery stone.
As the main elements, you can use blanks from homemade bars - to aluminum plate glue sheets of sandpaper, while their grain size should be different. Such a device can be easily fixed in the lever.
home design feature- this is the presence of a hinge with a double degree of freedom. Such a device can be easily assembled using the same textolite bars for this. One of them must be screwed onto the threads of the vertical stud, and used as a horizontal pivot and height adjuster for the linkage (this is necessary to set the sharpening angle).
The function of the second bar, which has a horizontal hole for the lever, is that it must be screwed to the first.
Thanks to this, it is possible to ensure the free type of movement of the entire lever design vertically.
Knives are clamped with a plate, or fixed on the surface of a neodymium magnet. When removing the first layer with coarse types of abrasive, the blade must be securely fixed.
If it is necessary to perform fine-tuning, then you can install the blade on a magnet and perform the sharpening operation with little effort. The horseshoe of the magnets should be recessed flush with the tabletop and seated with epoxy.
Manufacturing homemade device for sharpening knives can be considered complete. It is enough to set the desired angle, slowly sharpen the edge with a smooth movement along the entire length of the blade.
Video "Knife sharpener with your own hands"
Device for sharpening knives on an electric emery
An electric sharpener will allow not only to speed up the work, but also makes it possible to obtain high-quality concave edge profiles on the blades, the so-called fuller sharpening. It is impossible to achieve such forms using a linear bar; therefore, these types of devices are not interchangeable, but complementary devices.
It is noteworthy that a person, working on a manual grinding device, a person himself controls the speed and intensity of the processes performed, while emery wheel has a constantly high rotation speed, which can adversely affect the condition of the knife.
When friction metal surface lends itself to strong heating, which results in the "vacation" of the hardening of steel. The material loses many properties, it becomes less hard, which leads to grinding and the appearance of torn edges. Another problem with a "released" knife is the rapid loss of sharpness. In this regard, you need to work carefully on the electric emery, bringing the blade to sharpen the abrasive for short periods of time and taking frequent breaks so that the knife cools down.
Working in such modes, it is quite problematic to maintain constant angles, so the tool needs to be securely fixed during such processing.
To implement the design of such a device is quite simple. In the direction of the rotating axis on the emery there are guides along which the carriages with knives move. The angles are maintained mechanically, and the forces are determined directly by the operator.
This type of fixture is quite simple to do with your own hands - while there is no need to perform precise work to process metal parts. For the manufacture of guides, the foot material is actually used.
On the workbench, near the sharpener, guides are fastened, with the help of which it is possible to change the distance from the knife stops to the abrasive. This distance affects the sharpening angle. On the vertical rod must be present up and down freewheel regulators with durable species fixing the current positions.
The knife blade must be drawn horizontally, pressed against the thrust element. The force in contact with the emery must be adjusted directly in the process. Processing must be performed symmetrically, it is enough just to change the sides of the knife and sharpen them at the same angles.
The use of this method can only be used when processing the classic type of knives. Kitchen, hunting, tourist and other types of cutting planes of various tools need a slightly different approach.
A common type of design for sharpening knives - "joiner"
For such a device, it is necessary to use a specialized emery, with an end type working surface. The guide under the carriage is placed at the bottom so that it is located away from the rotating axis. This is due to the fact that in this part abrasive wheel, his work is considered the most effective. Guides with cutting elements move manually, the clamps are provided by the own weight of the tool.
A drawing of each structural is presented in the image.
This type of machine was used at the beginning of the last century, and for all the time the technology of its operation has remained unchanged. Thanks to simplicity this device it is easy to make for your home workshop. For this, any components made of metal, plastic, wood are suitable.
By replacing the cutting element on the jointer, you can sharpen ice ax knives, the main thing is to maintain the correct angle, which should be more gentle. The same principle applies to sharpening scissors.
To sharpen a chisel and a knife from a planer, you can also use electric emery and fixing carriages. But these types of tools are compact, and they can be sharpened with a mechanical device.
There are equivalent ways - along the edges, and across. In terms of quality, the processing is virtually identical; therefore, it is impossible, therefore, to single out a specific type of fixture.
For factory products, transverse edits of the blades are assumed.
By a similar principle, thick plywood is taken from which the card case is made. Any rollers can be used as a guide, preferably in an amount of more than two. By moving the machine along the surface of the emery, the ideal shape is given to the blade of the chisel.
If serious types of sharpening are not required, simpler devices are also suitable for small edits.
Fasten the bars with the required angles of inclination to the chisel. Put emery and a piece of glass near them. Soap solution should be applied to the glass surface.
You will be pleasantly surprised by the effectiveness of such devices.
For transverse sharpening - it is worth making a simpler device, where the guide element is also used as a support. A blade is fixed vertically on the movable part. The only drawback of this is the fixed angle, which is set during the manufacturing process.
But, compared with a knife, the deviations from ideals that have arisen are not so critical.
This type of fixture can be used to sharpen planer knives. But due to the wide size of the blades, the process is somewhat more complicated. In this regard, you can use an electric grinder that has an end working surface.
The stops are made from wooden bars. It is important to provide for the possibility of changing angles. Clamps are provided by the operator, and semi-circular sharpening can be performed, which is very indispensable for carpenters.
Naturally, this device is convenient to use for sharpening the edges of chisels. If, given the high performance index, you will be able to restore tools even with a large number chipping.
Now you know how you can create a homemade sharpener to perform all the necessary operations for sharpening knives at home.
Video "Device for sharpening various types of knives"
The blades in the cutting tool are the basis of everything. A kitchen knife, grinder discs, chains for a lawn mower or a chainsaw with a well-sharpened blade simplify and speed up the work process.
You can sharpen a tool in a professional workshop or at home if you make a do-it-yourself knife sharpening machine from simple materials.
For knives that are in household use, you do not need a special tool for sharpening, it is enough to have a sharpener in the form of a bar at hand. But if there is a chainsaw at home, the chains of which also need regular sharpening, or a grinder, the disks of which are constantly dulling, then it is better to make the installation yourself. The essence of the device is as follows: a bar is attached to the desktop in two variations - with or without adjustment. For those who do not understand the essence of making a sharpener with their own hands according to the text, they can watch photo or video master classes.
Device manufacturing scheme
In order for the device to turn out to be of high quality and safe, you need to calculate in advance the dimensions of the machine for sharpening knives with your own hands and select necessary materials. The first thing to do is to calculate the angle between the working part of the cutting blade and the bar.
This is followed by the selection of base materials (support) and stone. You can make a machine from glass covered with sandpaper or stone attached to a support. The first option is less expensive, and sandpaper can be changed at any time, but more reliable installation- made of stone.
Process Nuances
In order for the machine for sharpening knives according to the drawings with your own hands to turn out to be ideal and last for more than one year, you need to use the advice of specialists. The first thing to take into account is what kind of blade will be sharpened.
After all, an individual angle is selected for each knife:
- Blades for cutting hard objects (for example, cardboard, wood, metal), chainsaws - 30-45 degrees.
- Hunting, tourist knives - at an angle of 25-30 degrees.
- Kitchen cutting tool for cutting various products, you need to sharpen at 20-25 degrees.
- Simple knives for cutting bread, vegetables and fruits require 15-20 degrees of sharpening. At the same angle, you need to sharpen ordinary household scissors, as well as razor knives.
Necessary materials
If you need to make a sharpening machine, you will need the following materials:
- several wooden bars;
- sandpaper;
- cutting tools;
- drill with several drills.
Simple machine. Step-by-step instruction
- Step 1. Take three rails and place them so that together they form the letter H. The width of the middle rail should be equal to the width of the saw bar. Repeat procedure.
- Step 2. Place the rails perpendicular to each other, connecting their bases - the main structure for holding the saw bar is ready.
- Step 3. This is one of milestones! It is necessary to correctly calculate the angle of attachment of the bar relative to the rails. Calculate it using measuring tools and mark the places where the timber is attached to the vertical and horizontal rails.
If you want to universal fixture, then you need to make several retractable bolts at once at a spacing distance so that you can change the slope of the beam if necessary. This can be done with simple measuring tools and drills. After that, you can cut the slats to a convenient length.
The inconvenience of such a machine is that you have to independently control the location of the knife relative to the beam. If you do not want to think about anything at all while sharpening knives, scissors or chains, then you should make a more complex machine.
Universal machine. Step-by-step instruction
Read each step carefully and, where possible, draw a drawing for each step with all dimensions - this will be a great help in your work:
- Cut out two rectangular trapezoids from plywood, the bases of which will be equal to 60 and 170 mm, and the sidewall along right angle- 230 mm.
- Cut out a rectangular plank with dimensions of 230 by 150 mm.
- Fasten the rectangle between the bases so that it protrudes 40 mm upwards.
- Cut out a 60mm by 60mm block and attach it to the base of the wedge.
- Using a drill, make a vertical hole in the bar at a distance of 50 mm from the center. Insert the futors from above and below the hole, and into them - a hairpin of the appropriate diameter, 25 cm long.
- Work on a rectangular base. At the level of 40 mm of the protrusion, make a cut of about 2 mm so that a sheet of sandpaper can be attached to this place
- Make a fixer:
- Take an L-shaped plank with dimensions of 15 by 18 cm along the long edges and an approximate width of each shelf up to 5 cm.
- Take a rectangular bar 5 by 5 cm.
- Make a groove in the plank at the level of the hairpin and fix the planks on it with minimal mobility.
8. Make a traffic controller:
- Secure the stud with a nut so that it does not rotate.
- From hard wood, cut out a block with dimensions of 20x40x80 mm and fasten it to the stud with nuts.
- On the wide side, make a hole of 9 mm indented from the edge of 15 mm.
- Cut out two bars of 50x80x20 mm from hardwood and make one hole in them at a distance of 20 mm from the edge in the center.
- Take the welding of a stud and a smooth rod and fasten the bars on it as follows: first the fixing nut, then the first bar. Then aluminum profile, then the second bar and another latch.
- Glue the sandpaper to the aluminum profile.
The universal sharpening tool is ready. Cut out some patterns with different angles so that you can navigate them while working. Remember that at each stage of creating a tool, pre-created drawings will help you - do not neglect this step, otherwise it will be very difficult to avoid mistakes.
No matter what you need to sharpen - simple kitchen knife, garden or nail scissors or chains for a chainsaw - such a tool will cope with any job if you set the angle correctly and do not forget to use it when such a need arises.
You can sharpen a dull knife without going to the workshop and spending extra money on your own - you need a grinding stone and a steady hand. The difficulty is that it is not easy for a person without experience to maintain the angle of inclination of the blade with respect to the abrasive bar, and without this the knife can be spoiled: bent, twisted or dulled even more.
Restore cutting edge sharpness more convenient device, which is easy to make in 2 hours from improvised materials - those leftovers that can be found on the balcony, in the garage or in the shed. A do-it-yourself knife sharpener can be both a primitive system and a complex functional unit.
A knife sharpener makes the job much easier.
The main types of homemade devices
The main condition for homemade knife sharpeners is not to distort the angle between the edges of the blades set in production. It is not easy to withstand it by hand, without a full hand and skill.
The device fixes the sharpening angle, so sharpening a knife with a special tool is much easier than with a bar.
The following are the simplest and most popular sharpeners, each of which can be made independently:
Grinding (abrasive) bar or stone - necessary element any factory or homemade device for sharpening a knife. It is convenient when it has the shape of a rectangle (should be longer than the blade), so it is easier to sharpen the tool.
Stones come in different grain sizes: coarse, medium and fine.
It is determined by the number of grains per unit area and is expressed as a number, the smaller it is, the rougher the stone.
To sharpen knives, you will need bars with medium and fine grain.
For sharpening knives, abrasives with a grain size of 200-350 are not used. Such grains can deform the blade. Knives are sharpened on bars with an average grain - from 600. After the main processing, the blade is ground and brought to a shine with sandpaper for 1000-1200 grains.
A double-sided bar, when there is a rough abrasive surface on one side and a more elegant one on the other, is doubly convenient, since it can be used to sharpen the knife and finish it.
Stones also differ in the material from which they are made. Natural - from shale and corundum rocks. These stones are coarse-grained and wear down quickly because they are moistened with water or oil during work. There are diamond and ceramic bars that are more wear-resistant and will last longer than natural ones.
Self-production of a simple model
All homemade devices for sharpening knives, they help to accurately maintain the specified angle of inclination of the bar to the blade, which is important for maintaining the performance of the tool and obtaining a good cutting edge of the blade.
Easy for self assembly is a machine designed by Lansky. To make it, you do not need special training or special technical knowledge. You will need a minimum of the simplest materials that are always at hand. In the store, such a machine costs about 1500 rubles.
The principle of operation of the Lansky machine tool is that the knife is securely fixed and its processing takes place at a given angle using replaceable sharpening nozzles made of stone of different grain sizes. The result is a sharp blade edge.
Step by step master class
Required Consumables:
- A metal bar with a diameter of 6 mm, which must be cut into rods of different lengths.
- Welding electrode for the manufacture of corner guides. It is completely cleaned of flux and polished with medium-grained sandpaper.
- carbonaceous stainless steel 3-5 mm thick for clamps. Through holes are made in them. Tip: machine oil will make it easier to drill slots in the plates. You can wash the oil with a concentrated solution of soap residue.
- Metal corners measuring 9x9x0.6 cm.
- Fasteners: nuts, screws.
Sequencing:
- grinder with diamond disc(Bulgarian) cut corners, the edges of which are then leveled with a file and sanded with sandpaper.
- in horizontal and vertical planes drill holes.
- Handle the bevels of the guide rail.
- A rack is made from a bolt with a nut. Then fix it in a clamp or vice so that the whole structure is securely fixed.
- Assemble the entire device.
- Attach abrasive and knife.
- Testing the device.
Blade sharpening rules
There are several subtleties that are important when sharpening knives:
- it is recommended to start processing the blade from the base of the knife, from its bluntest part;
- it is advised to paint the edge of the blade with a marker in any color so that when sharpening it does not protrude beyond the working area;
- the sharp edge should be perpendicular to the grindstone;
- household knives are sharpened at an angle of 20-25º;
- the movements must also be correct: it is necessary to sharpen smoothly and evenly, without much pressure;
- in conclusion, the blade can be passed several times over a ribbon belt rubbed with goyi paste.
Knife sharpening angle diagram.
Sharpening device from mounting brackets
The prototype of a home-made sharpening device from mounting brackets is the drawing of the aforementioned professional Lansky sharpener.
For the manufacture of such a device you need:
- metal plates 4x11cm;
- aluminum corners;
- metal bars 15 cm long;
- bolts and nuts;
- tap for threading;
- grinding machine for metal;
- vise or clamps;
- small file for fine sanding.
You can do without a grinder. It will be replaced by a file or any tool that can smooth out sharp corners metal structures.
A high-quality do-it-yourself knife can be made from mounting corners.
Assembly sequence:
- On metal plates, according to the scheme, designations are made where to drill grooves.
- Threads are cut in the prepared holes of the taps.
- To make the sharpener comfortable, all surfaces of the metal structure are treated with a file: sharp corners are rounded, burrs are filed, edges are leveled;
- Holes are drilled in the corners according to the drawing.
- With a file, expand the place for supporting the rod.
- Threads are cut in the holes with a tap.
- Nuts with a diameter of 6 mm twist the rods inserted into the extreme grooves.
- A 14 cm bolt with a diameter of 8 mm is screwed into the expanded hole in the base. Before that, a wing nut must be screwed onto the bolt, and two nuts onto it. This bolt will support the entire structure.
- Bolts are attached to the remaining grooves. With their help, the blade will be fixed.
- Nuts are screwed onto the rods, a corner is strung and fastened. The sharpening angle will be adjusted by raising or lowering the rods.
- A device for attaching an abrasive stone is assembled from a thin L-shaped metal rod, a threaded rod with a diameter of 6 mm, two holders and a wing nut. The end holder must have through hole under the needle
This knife sharpener is quick to assemble, easy to use and has a wide range of sharpening angles.
Why is the sharpening angle so important?
The angle of the cutting wedge (the distance between the edges of the blade) is an important characteristic of any knife. It is set during production, depends on what function the cutting tool performs and varies from 55º (machete) to 10º (scalpel).
- for splitting and cutting hard materials- splitting bone, cutting bamboo, splitting coconut - you need a strong cutter with an angle between the edges of the blades of 45-55º;
- knives for separating meat from bone and cutting fibers with veins are sharpened at an angle of 40º;
- for a blade similar in functionality to an ax (they can chop wood, chop meat, cut straw), an angle of 35-40º is characteristic;
- universal knives (hunting or fishing) are sharpened at an angle of 30-35º;
- for standard kitchen work(cut bread, vegetables, cheese) an angle of 25-30º is suitable;
- for cutting fillets, the tool is sharpened at an angle of 10-15º;
- for a dangerous razor blade and a scalpel, an angle of 8-12º is provided.
In order for the knife to work properly and serve for a long time, it is important to sharpen it at the right angle.
