How to sharpen knives for a woodworking machine

Sharpen knives for woodworking machines yourself

Sharpening knives with your own hands is a painstaking procedure due to the hardness of the products being cut, the frequency of use of the tool, and the thickness of the cutting edge.

The need for surgery arises regardless of the quality of the blade. How to do this at home? Let's try to figure it out.

Why do you need to sharpen knives? Is it possible to do it yourself?

Any housewife knows that sharpening knives is very important: working with a blunt tool is not only difficult, but also dangerous. The process slows down significantly and requires serious effort, as a result of which the muscles of the hand quickly tire. In addition, the blade is capable of jumping off at the most crucial moment and causing injury.

You can take the product to a workshop, where they will quickly sharpen it for you. But where is the guarantee that the work will be done correctly and the blade will not be damaged? In addition, this service is far from free and requires significant time. And sometimes this is really lacking when preparing for a celebration, for example, in order to prepare dinner on time. If you have a knife sharpening machine at home, you won’t have to go anywhere. The quality will depend only on your skills, the tools and devices used.

Why do knives lose their sharpness?

No matter how high-quality the steel of the blade is, sooner or later any knife will become dull. Why is this happening?

In the process of interacting with the material being cut, the cutting edge loses microscopic fragments of steel. At the same time, its shape changes, and the blade loses its sharpness.

In addition, such a process causes deformation of the blade. When cutting food, we apply force, which almost always deviates in one direction or another. Of course, if this were the only reason, then there would be no need to sharpen knives so often. Another detail is important, the influence of which on the severity is much more significant.

It is almost impossible to maintain the direction in accordance with the plane of the blade. As a result of this, the thinned edge is slightly bent, and it becomes much more difficult for the knife to overcome the resistance of the material being cut. This process occurs especially quickly if the blade is made of low-quality steel.

There is a point of view that hot water can dull the blade. To some extent this is true. During contact with steel, salts dissolved in water react with the metal, causing a change in its properties that is not for the better. But such an impact is not decisive and does not have serious significance.

Basic principles of knife sharpening

There are several sharpening methods. The choice depends on the time you have, the purpose of the knife, and the tools and accessories available.

The general principles are:

  • initial processing is carried out with coarse abrasive;
  • subsequent grinding is performed with fine-grained material;
  • For final finishing, leather or various pastes of varying degrees of abrasiveness are used.

To make work easier, you can use a purchased or homemade knife sharpening device.

At what angle should knives be sharpened?

The sharpening angle mainly depends on their purpose and, accordingly, the quality of the material from which they are made. What sharpening angle should be used for knives designed for various needs is indicated in the table:

The purpose of the knife Cutting edge sharpening angle
Dining rooms 55-60°
For hunting and folding.

Increased requirements for cutting edge stability.

40-45° For hunting and folding.

Increased requirements for blade sharpness.

30-35° Used for professional cutting of vegetables. 35° For the kitchen. 30-35° Used for professional meat processing. 25-30° Used by professionals, for universal use. 25-30° Used for professional fish processing 25°

In some cases, the angle can be reduced to 15º if the tool is used for a special purpose, for example, slicing fresh baked goods.

Materials used

Do-it-yourself manual knife sharpeners can be made using bars of varying degrees of abrasiveness. The latter are conventionally divided into the following groups:

  • the roughest, which is not used in this case (from 200 to 250);
  • rough - to form the profile of the cutting blade of the blade. If no visible defects are detected, such stones are not used (from 300 to 350);
  • medium - like those listed above, are used infrequently, mainly for rough adjustment of the blade profile (from 400 to 500);
  • small - the main type of stones used for sharpening knives (from 600 to 700);
  • very small - used to bring an already sharpened blade to a mirror-like appearance.

These stones are made from various materials. A do-it-yourself hand sharpener can be made from natural and artificial bars. Natural - from natural stone (corundum, slate, etc.). Artificial - made of synthetic materials or diamond. Moreover, natural ones wear out more and are not very grainy.

Before use, it is preferable to moisten the bars with water or soap solution.

Please note: you should use a whetstone that is significantly longer than the blade being sharpened.

In addition to abrasive bars, the following can be used:

  • homemade devices that serve as their holder;
  • knife sharpening machines;
  • mechanical sharpeners;
  • musats are devices for fine-tuning a sharpened blade and are several metal disks nested one inside the other.

This list may be expanded. We have given only the main tools used.

Manual sharpening rules

In order to sharpen the cutting edge correctly, you must follow the specified sequence of actions:

  1. at the initial stage, we carry out the work with a medium or coarse grain block, depending on the condition of the blade; it would be more correct to secure the block from displacement;
  2. determine the required sharpening angle; on each side of the blade, its size is half of the total; the main thing is to keep this angle unchanged;
  3. movements should not be jerky; no significant effort should be made;
  4. The initial move is made from yourself, the edge should pass along the entire length of the block. Please note: when contacting the block, the blade must be directed at a right angle to the direction of movement;
  5. at the point where the blade is rounded, it should be rotated to maintain the desired angle;
  6. when completing the movement, the blade should not leave the block, because this may cause it to become dull or damage the side surface;
  7. then we move in the opposite direction;
  8. We continue the sequence of these operations until a thin bending strip appears on the blade; when checking its presence, you cannot run your finger along the blade, because you can easily get hurt on the sharp edges; if the knife is sharpened correctly, this edge should be the same width throughout the entire blade;
  9. turn the tool over and repeat the operations until a similar result;
  10. we take a smaller whetstone and sharpen it further, but we no longer move it towards ourselves - only in the forward direction; since the grain size of the bar is smaller, the size of the burr along the edge is also reduced;
  11. We process the reverse side in the same way;
  12. we repeat these operations on both sides on an even smaller stone; if the burr still remains, remove it with the finest-grained stone; We remind you that movements are still carried out in one direction - away from you; We reduce the clamping force towards the end of the operation.

Sharpening is finished. It is also possible to finalize the blade on a leather strip. An old belt will do just fine.

How to make a homemade device

It is quite possible to make a machine for sharpening knives at home yourself. Let's look at some of them.

Option No. 1: the blade is fixed on a stationary platform

This device helps sharpen the blade, ensuring the required edge angle. Below is a tool for sharpening knives with your own hands. Drawings and drawings.

A homemade knife sharpener can be made in the same way as shown in the figure.

The principle of operation and design are clear. The manufacturing sequence is as follows:

  1. the base can be chipboard or steel plate; it is marked and drilled out for the stand and blade holder;
  2. on the side of the base opposite to the mounting of the rack, a hole is drilled for an M8 bolt to attach the knife clamp;
  3. two M10 studs are made: one for the stand, the second for the holder for the abrasive stone;
  4. a bracket is made for attaching the holder stud to the stand (by drilling and bending a steel or aluminum plate;
  5. the brackets for the sharpening stone holder itself are made from two corners;
  6. a clamp for the blade is made;
  7. The structure is assembled in the form shown in the figure.

This device has one drawback: it is not able to provide a right angle between the movement being performed and the blade of the blade at the point where it is rounded.

Option No. 2: with a movable platform and a magnetic holder

This problem is solved using the following construction. It is performed in a similar way, but a magnetic holder is used to attach the knife. Thus, it is possible to move the magnetic holder with the blade installed in it and rotate it to the required angle. This knife sharpening device is equipped with a plate at the base or can be attached to the table, as shown in the photo.


Sharpening planer knives at home - Machine tools, welding, metalworking

Owners of planing machines and electric planers periodically face the problem of sharpening cutting edges. A well-sharpened tool will ensure clean wood processing even at non-ideal angles and speeds. The easiest way is to sharpen knives and knife heads with your own hands using specialized equipment.

Knife sharpening is necessary

sharpening planer knife

Planing knives require timely care because:

  • blunt surfaces process wood poorly;
  • when processing soft rocks with dull knives, the surface becomes covered with lint and unevenness;
  • worn edges crumble;
  • During planing with blunt edges, the engine and power units are overloaded.

Attempts to sharpen blades with your own hands using diamond stones, as a rule, give short-term results. Due to poor quality of editing, the blades have to be sharpened soon. Therefore, professional carpenters use only mechanical sharpening.

Types and designs of machines

The machines on the market are distinguished by the knife feeding mechanism:

The machine for sharpening planing knives with manual feed consists of:

  • grounds;
  • abrasive stone;
  • carriages for fixing the knife.

During processing, the cutter moves forward with the help of a handle. Transverse movement of the cutter is ensured by a flywheel.

Automatic machines differ in size and range of options. Mechanisms for industrial use are installed on a powerful cast-iron frame. The carriage is equipped with a support. You can set the speed of movement of the blade and the thickness of the metal layer being removed. Industrial machines allow you to simultaneously sharpen several planer blades without changing settings.

Corvette K-470 WTG-163 GA-630 GA-850 ZX-1000
Maximum length of knives, mm 630 630 640 850 1000
Abrasive disc diameter, mm 100 150 125 125
Sharpening angle, degrees 3555 up to 30 3545 3545 Up to 30
Engine power, W 550 550 850 850 1500
Dimensions, cm 90 x 48 x 42 100 x 60 x 65 100 x 54 x 120 120 x 54 x 120 190 x 56 x 150
Weight, kg 75 60 112 125 250
Add. intelligence Equipped with an asynchronous motor, wet sharpening possible Processes milling cutters, circular saws Wet sharpening possible Can sharpen up to 4 blades, wet method A wet method is provided, a cup-type grinding disc is controlled via a remote control

Table 1. Characteristics of some models of machines for sharpening planing knives

Compact automatic machines for home and small workshops are designed to process one cutter in one go. They also provide speed control and automatic tool feeding.

Before starting work on any sharpening equipment, you should make sure that the frame is securely fastened. Machine vibration impairs the quality of sharpening and can lead to injury to the operator.

Basic rules for using manual feed equipment

machine for sharpening planing knives Corvette-470

Such machines are used for one-time work and for sharpening small batches of blades with your own hands, since the processing process is quite lengthy.

  • Before starting work, you need to make sure that the grinding surface is clean, without stains or streaks.
  • The movement of the carriage should be smooth, without jerks or jolts. It is forbidden to stop it when the cutter approaches the sharpener.
  • The faster the carriage moves, the lower the quality of sharpening. The optimal speed of movement is 5 - 6 m/minute.
  • For proper sharpening, the range of motion of the carriage is important. During a pass in each direction, it should move 10 - 13 cm further than the end of the knife. This ensures optimal contact between the cutter and the sharpener, which must be broken before moving in the opposite direction.

Basic rules for working on automatic machines

  • Planing knives can be sharpened dry or wet. In the second case, the blade is constantly washed with a stream of water. The wet method is gentler on the blade and more effective;
  • Before processing begins, it is necessary to set the following parameters: sharpening angle, amplitude of carriage movement. The amplitude should be 15 cm greater than the length of the knife;
  • The blades are carefully fixed in the mobile carriage with your own hands.

Homemade machine for sharpening planing knives

machine for sharpening planing knives Kraton-630

The design, made at home with your own hands, allows you to quickly and efficiently sharpen knives to one set angle. This will change the factory angle, so all blades will need to be re-sharpened. The quality of planing will not deteriorate, but may even improve.

To make a device for sharpening straight blades of planing, jointing and thicknessing machines with your own hands, you need:

  • metal corner No. 50;
  • round pipe with a diameter of no more than 50 mm;
  • electric motor from a washing machine;
  • powerful spring;
  • bolt with nut;
  • plastic handle (knob);
  • Bulgarian;
  • welding machine.

Making a machine with your own hands.

  1. Cut a corner about 50 cm long.
  2. We bend two pieces of pipe so that we get a stable stand for the corner, and weld the legs. The corner should be positioned vertically towards the master.
  3. At the left end, behind the corner, we attach an electric motor. It is placed on two points: a rigid axis and a powerful spring; The spring is tightened and released using the adjusting screw, moving the motor closer or further from the angle guide.
  4. We put an abrasive wheel on the electric motor shaft.
  5. The engine is started by a switch located on the frame in a convenient location.
  6. We feed the tool using homemade vise from a piece of pipe 25 cm long, a pressure plate, a bolt with a nut and a knob. We clamp the knife in a vice and move it along the guide, holding it by the knob.

review of this machine model:


Sharpening angle of knives for planing machines


Any owner of planing equipment has had to deal with sharpening the corresponding knives. If you have a special machine at your disposal, then this will not be difficult to do. Another option would be to contact a specialized workshop. You can also sharpen such cutting tools yourself.

Why is timely and correct sharpening necessary?

Planing knives, like other cutting tools, require maintenance for certain reasons:

  • with a blunt blade of planing knives, the wood will be processed very poorly;
  • when working with soft types of wood, pile and various irregularities will form on the surface;
  • the worn edge will crumble;
  • When planing with blunt tools, the machine motor overloads

Even if you decide to sharpen it yourself using diamond stones, the effect of such work will be very insignificant. You'll have to resharpen them soon. For these reasons, people who plan professionally choose only automatic or mechanical sharpening.

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Preparing the workplace and equipment, installing the screw that controls the angle

To sharpen knives, you will need a special sharpener, but you must use modern variations of it with a low speed, which have water-type cooling. The Tormek T7 with a special Tormek SVH holder is most suitable for these purposes. A smooth and clean sharpening stone will help you complete this process efficiently. In the future, a practical example will be considered based on a set of Tormek equipment.

When sharpening, you need to install a screw with which you can change the sharpening angle, but first you need to prepare the workspace by fulfilling certain conditions:

  1. We install the Tormek SG250 sharpening stone, leveling it using a special tool Tormek TT-50. The device comes complete with T7.
  2. It is necessary to smooth the sharpening stone using a cleaning and leveling stone.
  3. We remove the standard stop and install a specialized stop.
  4. We screw in the screw itself, which can later be used to adjust the angle of the chair being sharpened.
  5. We install a special holder for the blade.

It is recommended to sharpen cutting tools whose width is more than 12 millimeters. And the length of the knife no longer matters. In addition, you can rearrange long knives. Correct installation of the blade in the holder is of great importance, because sharpening with large distortions is possible. Correctly this process is performed as follows: install the back of the knife all the way and clamp it with special holders.

Estimating and setting the required inclination angle

By analyzing the characteristics of the marks left by the sharpening stone, it is possible to correctly assess the angle of inclination by selecting the desired proportions. Then a holder with a knife is installed on the fixed stop.

Adjustment is carried out using the stop screws; you need to lower the holder until it touches the stone. Using the angle adjustment screws, select the required parameter in relation to the stone.

When rotating manually, the marks on the painted blade determine the need to adjust the angle of the holder. And if necessary, such adjustments are very easy to make.

Operating angle range 30-45 degrees. Its exact degree is determined by the specific type of tree. A 1985 handbook written by Karl Fronius states that quality will depend not only on the angle, but also on the blade's reach and head diameter.

The classic parameter is considered to be 40 degrees. When choosing a specific number, do not forget that the cutters are designed according to a standard backing. If you increase the angle, there is a risk of the butt rubbing against the workpiece.

And if you reduce it, the cutting edge will become weaker and thinner.

Solving the problem of choosing the right angle

There are two ways to solve the problem of setting the required angle of inclination:

  1. Using a double-headed backing based on the principle of double-layer blades. We make the main back at an angle of 40 degrees, and the very top of the knife - about 20 degrees. This will significantly extend its service life, and the knife will also have good shock resistance.
  2. Check the sharpening pattern and modes.

Some rules and features of sharpening

Having set the angle of inclination to the desired position, you can begin the sharpening process itself. You can record the amount of metal being removed; two sliders with a scale and 0.1 mm division are designed for this purpose. The sharpening specialist will be able to adjust this parameter quite accurately. Do not forget to securely fix it with special clamps after each filing to prevent vibrations during sharpening.

The sharpening process itself is carried out by changing the position of the holder in relation to the sharpening stone. It is important to ensure that the knife does not go beyond the extreme point of the stone. It is advisable to stop the holder 10 mm from the edge. Separate stops are provided as a braking element, by moving which the desired stroke is set.

The decisive factor here will be the experience of the person who sharpens the planing knives. During the process itself, water is formed, which accumulates and collects on the blade. Then it flows onto the body itself and onto the floor. A lot of water is wasted, so don’t forget to constantly add it to the special section.

And the spill itself can be reduced by placing some kind of pad under the leg, 6 mm high.

Another nuisance during sharpening will be the constant clogging of the sharpening stone, which affects the duration of this work. It is best to periodically clean it with the SP-650 bar provided for this purpose. When working with soft metal, sharpening will go much faster and the stone will have to be cleaned less often, because such material is removed in fairly massive sections.

After half an hour of work, you get an even chamfer with a stable burr. All that remains is to polish it using a leather wheel and polishing paste. First of all, you will need to complete the plane of the knife, and only then the chamfer itself.

Features of working with a manual machine

Manual machines are used only in cases where it is necessary to sharpen not too many knives. Otherwise it would have taken a lot of time. But if you need to sharpen several knives, then this method will be quite acceptable, but you must adhere to the following rules:

  • you need to check the surface of the stone, because the use of such machines is only possible with clean sharpening tools;
  • try to make sure that the carriage with the attached knife is brought in quite smoothly, without any sharp jolts;
  • the speed of movement of the carriage should not exceed 6m/min, high speed may damage the blade;
  • During one pass, the carriage must advance a distance that is 15 cm greater than the length of the knife.

Features of working with an automatic machine

  • the wet method is more suitable for sharpening planing knives, because the blade is constantly cooled;
  • at the preparation stage, you already need to set all the parameters, including the angle of inclination and the distance of movement of the carriage;
  • the most important factor is the installation of knives on the carriage;
  • the process should be carried out quite smoothly, without sudden twitching

DIY sharpening machine

If desired, it is possible to assemble the sharpening machine yourself. You will need the following items: table, faceplate, vacuum cleaner, motor and machine cover. The faceplate will become the main and most expensive component. It is advisable to choose American or German manufacturers. Then an engine with a power of 1.5 kW is selected; even supported options are suitable. For example, you can purchase motors from washing machines.

The motor must be installed under the tabletop, and the faceplate must be secured to the moving element. Don't forget to consider the on and off buttons. You need to put a casing on the faceplate, cutting off one side, from which sharpening will be done. You will also need to make a cutout at the bottom of the tabletop for a vacuum cleaner. This machine is also suitable for working with other cutting surfaces.

Sharpening knives in specialized workshops

If you are unable to organize the correct sharpening of planing knives or it becomes difficult to set the desired level of inclination, then contacting a workshop will be an excellent solution to the problem. This method has the following advantages.

  • Expensive and high quality equipment is used. The straightness of the cutting edge will be much better than when processing it yourself.
  • Modern cooling systems are used that will prevent the cutting surface from overheating and collapsing.
  • Additional materials and special technologies are used to refine the knife, which affects the functionality and service life of such knives.
  • In a workshop environment, it is possible to obtain the most even edge due to the absence of overheating and weight differences. In practice, the result should be an ideal instrument.


Sharpening machine for planing knives

Owners of planing machines and electric planers periodically face the problem of sharpening cutting edges. A well-sharpened tool will ensure clean wood processing even at non-ideal angles and speeds. The easiest way is to sharpen knives and knife heads with your own hands using specialized equipment.

Homemade sharpening machine for planing knives: how to make it yourself

The sharpness of a knife is one of the main parameters affecting the quality of wood processing. In addition, this characteristic also affects the degree of safety when working on the machine.

Often a person does not want to run around over and over again in search of a place where he could bring his cutting tools into proper condition. In this case, it’s time for him to think about making a homemade sharpening machine that would solve the issue of the sharpness of planing knives once and for all.

The device of sharpening machines

The development of industrial equipment does not stand still. There is a constant rapid increase in requirements for speed and, most importantly, for the quality of material processing. In this regard, there is a need to create cutting tools with high parameters.

One of the main problems that arise during the work process is sharpening knives. This is what determines the basic capabilities of the machines and their suitability for use.

Homemade sharpening machine.

Depending on the tasks to be solved, such devices are divided into two types: universal and special. The first are sharpening devices for the surfaces of most cutting elements. They are equipped with a variety of devices that allow you to secure, install and sharpen knives.

The second category is designed to work with hobs, drills, circular saws and other specialized tools.

All units are equipped with various equipment, which determines the degree of automation and control of the accuracy of the work performed. The designs of the machines also vary. These can be stationary devices or temporary ones that can be placed on any horizontal surfaces.

Despite the wide range of types of equipment offered, in order to save money, a knife sharpening machine can be made by hand.

Although, of course, many models of universal devices allow you to choose the most suitable type of equipment that can solve the tasks.

Homemade knife sharpening machine

The manufacture of homemade machines is most often due to two reasons. The first is the desire to save money. The second is to show your skill and do everything with your own hands exactly as your soul desires.

Drawing of the machine device.

For example, very often you may be faced with the need to tidy up only certain tools. These can be drills, cutters, saws or jointing knives.

Each specific case requires a separate approach. Self-assembly of the machine will allow you to create a convenient unit for working with certain elements.

Among other things, the presence of sharpening units will significantly save costs aimed at purchasing new knives or restoring them in third-party workshops.

In addition, purchasing in a store guarantees that the device will solve the assigned tasks for a long time. You should also remember the degree of automation. Of course, professional devices use electronics that are simply impossible to make at home without the proper experience.

Option 1

A homemade machine for sharpening a planer will not only keep the tool in good condition, but will also save time on trips to other workshops.

One option for creating such a device is to use a motor with an abrasive wheel, emery cloth, or a sharpening device with a knife fixed in it.

Homemade machine for sharpening planing knives.

This device can be made partly from aluminum, metal and wood. In this case, bearings and guides are used, made from scrap materials, for example, pipe corners or others.

When the knives are level, they can be sharpened on a large abrasive stone. If this is not available, you should use sandpaper glued to a flat surface.

Depending on the requirements for the final result, you can vary the speed of this process. If there are dents, you must first use a belt sander, and at the final stage, treat the tool with an abrasive stone or a homemade one made from sandpaper.

The design features of the machines may also differ from each other. The first option is a device with a fixed base. Its angle of inclination can be changed, but otherwise it is in a fixed position.

The bar is attached to a rod, which is inserted into the loop of a movable clamp located on another rod. The disadvantage of this design is the “walking” angle due to the lack of rigid fixation.

The knife is installed using two steel plates fixed to a fixed platform. Having loosened the fasteners, insert the blade and clamp it. Then adjust the height of the bar so that the required angle is set.

Option 2

The second type of design provides a movable platform, as well as a magnetic holder. This option does not have the disadvantages of the previous unit. Fixed in this device is a frame with a bar that determines the angle.

The knife, in turn, is mounted on a movable table. The choice of holder remains with the master. You can use a magnetic type or a regular one, made of metal plates and “lambs”.

The principle of sharpening knives on a machine.

As you can see, making a knife sharpening machine yourself is not that difficult. If any problems arise, you can always take the help of training videos from the Internet. If all instructions are followed correctly, anyone can make such equipment.

Bottom line

A knife sharpening machine is a necessary piece of equipment in the workshop of every craftsman who works with wood. A timely solution to the problem of sharpening knives will not only speed up the process of processing the material, but will also save time and money.

Why go to other workshops if you can make the necessary equipment yourself?


How to sharpen thicknesser knives with your own hands

Sharpening knives for woodworking machines is a mandatory process that can be done with your own hands using special tools. Sharpening is the restoration of the previous cutting capabilities of hacksaws, scissor shafts, planers, jointers and other devices for wood processing.


General information

Photos of sharpened knives

  • To sharpen the blade shaft of a planer or jointer, you will need the appropriate device;
  • The sharpening work is done by hand;
  • Craftsmen learned to assemble sharpening devices;
  • When restoring hacksaws, jointing devices, sharpening knife shafts, be sure to follow several recommendations and strictly follow the technology;
  • If the teeth of hacksaws and knife shafts are sharpened incorrectly, the quality of wood processing with tools will significantly deteriorate;
  • Sharpening stones are a good alternative for a sharpening machine. But if you have the opportunity to assemble it yourself or purchase a sharpening machine, be sure to take advantage of it.

Preparatory activities

Diagram of the device for sharpening knives of woodworking machines

If you need to sharpen knives for a woodworking machine, you should start with the required preparation steps. It is not so important what parameters the knife shaft or cutting sheets of hacksaws have 13 mm, 20 mm or all 200 mm, they will definitely need sharpening.

Some people prefer to send dull shafts to special workshops, where they can easily restore the previous sharpness of a 200 mm knife or a small lathe cutter. But both ordering sharpening and buying new knife shafts is a financially expensive matter.

Preparation for sharpening begins with familiarization with the available means of restoring the surfaces of cutting tools and some recommendations.

  1. To keep jointers, planers, and hacksaws in working order, assemble or purchase an appropriate sharpening device.
  2. The simplest, budget option is a whetstone. But the quality of processing directly depends on your skills in working with stone. If there are none, it is extremely difficult to achieve the required level of sharpening. Plus, stones are not able to cope with all types of cutting tools that are equipped with modern woodworking machines.
  3. Choose a machine that can sharpen at low speeds, as this has a positive effect on the quality of the finish.
  4. The recommended equipment for a sharpening machine is a water cooling system.
  5. Carefully study the equipment of household woodworking machines. Often there is already a sharpening stone, which is optimally suited for processing the knives used.
  6. If the stone is not included in the package, it will have to be purchased separately, leveled with a special device, and smoothed. This is the only way you can sharpen the knife shafts of jointing machines efficiently.
  7. The machines have a function for setting the angle of inclination, adjustable with a special screw. By turning the screw and changing the position of the sharpening device, you can correctly fix the tool relative to the stone.
  8. The next preparatory stage is the holder into which the knife shaft is installed.
  9. If you are a beginner, it is not recommended to start your first job with 200 mm knives. Start literally with 13-15 mm, and gradually you will learn to process 200 mm and even 2 mm. To do this you need to accumulate certain experience.
  10. The length of the knife is not a fundamental parameter, since the knife in the holder can move to the distance you require.
  11. Make sure to hold the shaft firmly in place. Otherwise, you will get a significant distortion, due to which the quality of woodworking will suffer.
  12. Study the operating manual of the purchased sharpening machine in detail. If this is a DIY tool, you will have to rely on drawings and available information on the Internet about a specific sharpening device project.
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In order for the sharpening of knives for a woodworking machine to give a positive result, you can resume working with the equipment at the same level of quality, you need to adhere to a few fairly simple rules.

  1. The sharpener holder can move left and right relative to the stone to sharpen knives.
  2. Do not allow the blade to end up over the edge.
  3. Immediately fix the holder at a distance of 12 mm from the edge of the grinding wheel.
  4. When sharpening knives of 200 mm or smaller variations, make sure that the water cooling function is activated on the machine.
  5. The cooling system requires constant monitoring. The tank usually has a small volume, so water needs to be added periodically. If it runs out and the sharpening process continues without cooling, you risk ruining a rather expensive knife.
  6. As the knives are processed, water from the cooling system may accumulate on the floor. Since sharpening machines are electrical devices, ensure that water is drained away from your feet and wear rubber shoes. In any case, standing in a puddle of water while working with an electric machine is always dangerous. Follow safety regulations.
  7. Keep the whetstone clean. It gets dirty quite quickly with active use.
  8. The grinding wheels of machines are cleaned using a special device. The machines should be equipped with this cleaning bar, but if it is not included in the set, then you will have to purchase it separately.
  9. Each subsequent sharpening, according to the operating rules, is performed only on the condition that the stone is cleaned. Therefore, after each sharpening, arm yourself with a cleaning bar and treat the machine with it.
  10. On average, sharpening using a special machine takes about 10-20 minutes. It all depends on the type and size of the tool, which became dull as a result of woodworking operations.
  11. After sharpening the tools of woodworking machines, do not rush to return them to their place and continue working. After processing on the machine, the tool needs to be fine-tuned.
  12. Finishing consists of applying a special paste to the surface of the cutting element. Proceed according to the instructions provided by the manufacturer of the finishing paste on the packaging. Different pastes may differ slightly in application methods.

If you did everything correctly, then the knife should be perfectly smooth, sharply sharpened, and free of any irregularities or burrs. Don't worry when the result doesn't meet your expectations the first time. This takes some time and a little experience. That’s why you should start with simple and inexpensive knives that you don’t mind ruining.


Where to sharpen knives for woodworking machines

  • Skate sharpening
  • Sharpening sabers
  • Drill sharpening
  • Sharpening cutters
  • Sharpening scissors for metal
  • Sharpening a hacksaw
  • Sharpening blender blades
  • Sharpening pruners
  • Sharpening claw clippers
  • Ice drill sharpening
  • Sharpening axes
  • Sharpening planes
  • Sharpening circular saws
  • Sharpening lawn mower blades
  • Sharpening tailor's scissors
  • Sharpening knives for meat grinders
  • Sharpening saw chains
  • Sharpening thicknesser knives
  • Sharpening machine knives
  • Sharpening daggers
  • Sharpening Damascus steel knives
  • Sharpening folding knives
  • Sharpening ceramic knives
  • Sharpening German knives
  • Sharpening Japanese knives
  • Sharpening hunting knives
  • Knife sharpening
  • Sharpening thinning scissors
  • Sharpening hairdressing scissors
  • Sharpening scrapers
  • Sharpening manicure tools

Sooner or later, everyone is faced with such an important issue as sharpening knives. It is not always possible to make do with improvised means. And, if you can try to briefly revive an ordinary kitchen knife with the help of a home sharpener, then sharpening ceramic knives is a job for real professionals.

Knife sharpening in Moscow

Turning kitchen utensils has become a wide field of trial and error for non-professionals, but it is better to immediately take a specific blade to a workshop. Sharpening lawn mower blades itself reduces their working life, and unsuccessful attempts at self-processing can only speed up this process.

Even if you purchased a perfectly sharp tool, over time the thinness of the blade becomes significantly dull, which deteriorates the quality of its work. Sharpening is the only solution with which you can restore its original quality. A timely sharpened tool will allow you to easily and quickly deal with any material and will increase the efficiency and safety of any activity.

Sharpening knives for meat grinders in Moscow

Each type of work hides many pitfalls. Many tricks are known only to masters.

Sharpening knives for meat grinders can also be done at home; all you need is a sharpening stone, sandpaper and a lot of patience. It is important to clearly maintain a plane between the movable and stationary surfaces, because the comfort and quality of using the meat grinder in the future depends on this.


How to make a homemade knife sharpening device with your own hands

In households, the use of cutting, sawing and planing tools is often necessary. During operation, they lose their sharpness, and the blade needs to restore its original properties.

Taking your tools to workshops to sharpen them is a reasonable option, but in order not to waste money again, you can make a device for sharpening knives with your own hands.

: Making a corner clamp with your own hands

General information about sharpening knives

The goal of any type of knife sharpening is to ensure a sharp blade. And the most important factor that affects long-term and efficient operation is the sharpening angle. The practicality of this parameter is well assessed during the work process.

If you look objectively, you will notice that with a smaller angle, the knife blade results in a sharper one. But with this action, it turns out that the period of improved cutting qualities is not very long, i.e. it becomes dull faster. The sharper the knife blade becomes during the sharpening process, the more quickly it will become dull.

Based on this pattern, we can come to the conclusion that the angle must be selected correctly and the value must be maintained evenly along the entire length of the edge.

It is worth noting that only those types of blades that have a certain degree of hardening can be sharpened. If the steel hardness of the cutting parts exceeds 55 HRC, then it cannot be sharpened with any available tools.

The golden rule for sharpening knives is the constant sharpening angle of the cutting edge throughout its entire length.

To achieve this, you need professionalism, skills and special equipment that will allow you to hold the tool in your hands, maintaining a given angle of inclination of each cutting edge.

Features of using the device

Of course, a simple whetstone is suitable for sharpening a knife or the cutting edge of a plane. But its quality will not be the best. To ensure uniform removal of the metal layer and precision processing, it is necessary to use special sharpening devices.

The advantage of such a product is not only its ease of use, but also factors such as:

  1. The ability to fix the blades, which is quite reliable and does not cause unnecessary stress. a properly designed device does not allow the metal to be damaged during operation.
  2. Possibility of installing the bar at a certain angle. Thanks to this, when the cutting edge moves, the angle value will not change.
  3. Variation in setting different sharpening angles. 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 make a simple and quite high-quality device, you need to take care of preparing the following workpieces and tools:

  • plywood or 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 bars (alternatively can be replaced with hard wood - beech, oak, etc.);
  • aluminum plate (with a thickness of at least 5 mm);
  • fasteners – bolts, nuts (wing);
  • neodymium magnet (you can find it on an old computer HDD).

Drawings of a device for sharpening knives with your own hands

After preparation and provision of materials, you can begin the process of assembling the device. First of all, we take plywood to use as a frame, which should rest on the mounting legs at a certain angle in the range from 15 to 20 degrees. After this, the pin we prepared is screwed into the lower part; its length should be approximately 35-40 cm. To make the mounting thread more durable, you can use glue or sealant.

We fasten an aluminum plate in the center of the installed plywood. 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 use an aluminum plate as this will help avoid damage to the steel blade of the knife.

After this, we proceed to making a lever that will allow you to secure the emery to the device. To assemble it we use the remaining part of the pin. Then we take two textolite (or wooden) blocks and, by sawing out, we make holders for the lever. The stops should be secured on one side with a wing nut.

It is optimal to provide a spring-loaded block near the handle, which will allow you to quickly change the emery stone.

As the main elements, you can use blanks from homemade bars - we glue sheets of sandpaper to the aluminum plate, and their grain size should be different. Such a device can be quite easily fixed in the lever.

A design feature is the presence of a hinge with a double degree of freedom. Such a device can be easily assembled using the same PCB bars. One of them should be screwed onto the threads of the vertical stud, and used as a horizontal rotary axis and a height adjuster for the lever support (this is necessary for setting the sharpening angle).

The function of the second bar, which has a horizontal hole for the lever, is that it should be screwed to the first.

Thanks to this, it is possible to ensure free vertical movement of the entire lever structure.

The knives are clamped with a plate, or fixed to 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, you can install the blade on a magnet and perform the sharpening operation with little effort. The horseshoe of magnets should be recessed at the same level as the table top and set with epoxy glue.

The manufacture of a homemade device for sharpening knives can be considered complete. It is enough to set the desired angle and sharpen the edge slowly and smoothly along the entire length of the blade.

Device for sharpening knives using electric sandpaper

An electric sharpener will not only speed up the work, but also make 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 sharpening device, controls the speed and intensity of the processes performed, while the emery wheel has a constantly high rotation speed, which can negatively affect the condition of the knife.

During friction, the metal surface is subject to strong heating, which results in the “tempering” of the hardened steel. The material loses many properties, it becomes less hard, which leads to abrasion 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 with an electric sandpaper, bringing the blade for sharpening to the abrasive for short periods of time and taking frequent breaks to allow the knife to cool.

When working in such modes, it is quite problematic to maintain constant angles, so the tool needs to be securely fixed during such processing.

The design of such a device is quite simple to implement. In the direction of the rotating axis, there are guides on the emery along which carriages with knives move. The angles are maintained mechanically, and the forces are determined directly by the operator.

This type of device is quite easy to make with your own hands - there is no need to perform precise work for processing metal parts. The base material is actually used to make the guides.

On the workbench, near the sharpener, guides are mounted, 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. The vertical rod must necessarily have up and down free movement regulators that have durable types of fixation of the current positions.

The knife blade should be held horizontally, pressing against the thrust element. The force in contact with the emery must be adjusted directly during operation. The processing needs to be done symmetrically; you just need to change the sides of the knife and sharpen them at the same angles.

The use of this method can only be suitable when processing classic types of knives. Kitchen, hunting, hiking and other types of cutting surfaces of various tools require a slightly different approach.

A common type of design for sharpening knives is the “Jointer”

For such a device, it is necessary to use a specialized sandpaper 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 of the abrasive wheel, its work is considered most effective. The guides with cutting elements are moved manually, the clamps are provided by the tool’s own weight.

A drawing of each structural design is shown in the image.

This type of machine was used at the beginning of the last century, and throughout this time the technology of its operation has remained unchanged. The simplicity of this device makes it easy to make for your home workshop. Any components made of metal, plastic, or wood are suitable for this.

By replacing the cutting element on the jointer, you can sharpen the ice ax knives, the main thing is to maintain the correct angle, which should be flatter. Devices for sharpening scissors work on the same principle.

To sharpen a chisel and a plane knife, you can also use an electric sandpaper and locking carriages. But these types of tools are compact and can be sharpened with a mechanical tool.

There are equivalent methods - along the edges and across. In terms of quality, the processing is virtually identical; therefore, it is therefore impossible to primarily single out a specific type of device.

For factory products, blades are supposed to be adjusted transversely.

Using a similar principle, thick plywood is taken from which the frame is made. Any rollers can be used as a guide, preferably more than two. By moving the machine along the surface of the emery, the chisel blade is given an ideal shape.

If serious types of sharpening are not required, simpler devices are also suitable for minor edits.

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Attach the bars with the required angles of inclination to the chisel. Place sandpaper and a piece of glass near them. Apply a soap solution 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 also acts as a support. The blade is attached vertically to the moving part. The only drawback of this is the fixed angle, which is set during the manufacturing process.

But, compared to a knife, the resulting deviations from ideals are not so critical.

This type of device can be used for sharpening plane knives. But due to the wide size of the blades, the process becomes somewhat more complicated. In this regard, you can use an electric sharpener that has an end working surface.

The stops are made of wooden blocks. It is important to provide for the possibility of changing angles. Clamps are provided by the operator, and semicircular sharpening can be performed, which is very indispensable for carpenters.

Naturally, this device is convenient to use for sharpening the edges of chisels. Given the high productivity rate, you will be able to restore tools even with a large number of nicks.

Now you know how you can create a homemade sharpening machine to perform all the necessary operations for sharpening knives at home.

“Device for sharpening various types of knives”


Knife sharpening machines - yourdomstroyservis.rf

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Machines for sharpening knives at home or at an enterprise are mainly universal. Knives and chisels are not as universal as machines, although all knives, at least the cutting part, are very similar to each other. For the correct sharpening angle of knives, it is necessary to use machines that fix the knife when working with it.

Some models of knives, gift ones, made to order from a certain steel, special knives, and many more categories that under no circumstances can be sharpened on machines with an abrasive wheel or a diamond bowl.

To sharpen such knives, or rather to straighten the knife blade, special pastes or a soft type of felt are used.

How to sharpen a knife

There may be several answers to the question of how to sharpen a knife:

  • You can restore the tool using a sharpening stone or a set of triangular files with a fine notch;
  • Use a knife sharpener. The main difference between this method and the previous version is that the support under the blade allows you to maintain a stable sharpening angle of the edge;
  • Use a knife sharpening machine.

For ordinary people, sharpening knife edges is an everyday task, and if the choice is between using a DIY knife sharpening machine or sharpening a blade by hand adjusting the cutting edge for several hours, then common sense would probably choose a sharpening machine.

How to get a sharp edge on a kitchen knife

Each tool has its own recommendations for forming a sharp edge. For a kitchen knife, like any other, proper sharpening is obtained only if the following conditions are met:

  • The movement of an abrasive bar or other tool begins with the sharpest part and ends with the dull and low-value part of the blade, most often from the middle part to the tip of the blade, with a turn, as in the diagram;
  • Depending on the thickness and shape of the blade, there is an optimal sharpening angle. For a conventional kitchen version, the angle of the cutting edge is 25°, respectively, the blade should tilt above the surface of the block by 12-13°;
  • To achieve effective sharpening of the cutting edge, experts recommend choosing the right type and material for the sharpening tool.

Blades made of soft and tough steels with low chromium and carbon content can be sharpened with a file, while at the same time they very quickly clog the surface of the abrasive stone. Flexible forged blades must be fixed with a stop and sharpened with a block using sliding movements. Regular use of a whetstone for sharpening kitchen knives leads to greasy surfaces, which must be restored by grinding.

The old device for sharpening forged knives was made in the form of two wedge-shaped bars made of bog oak. The bars were placed on both sides of the blade so that the cutting edge remained free, the “sandwich” was tied with twine and sharpened with an ordinary whetstone to a razor sharpness. Wedges made of hard wood made it possible to correctly guide the block and obtain the required sharpening angle.

According to the recommendations given, manual sharpening of planer knives is performed. Fine-grained sandpaper is glued onto thick glass, but the beveled part of the cutting edge is placed on the surface of the abrasive and sharpened in a circular motion.

Sharpening a ceramic knife is more difficult; you can manually trim the cutting edge with a diamond-coated needle file, or use a special grinding paste.

Homemade knife sharpening options

The simplest device for sharpening knives is shown in the diagram. To make it, you will need a block of hard wood, the upper plane of which is sharpened at an angle to form the cutting edge. This solution helps to maintain the correct edge processing angle. To make sharpening the blade more convenient, you can screw a pair of self-tapping screws to fix the blade into the plane of the block.

To sharpen planing knives, you can make the sharpener attachment shown in the photo with your own hands. This solution simplifies the process and allows you to sharpen the blade as sharply as possible, but the lack of mechanization requires a certain skill and dexterity from the master.

Knife sharpening devices

Sharpening knives is certainly a creative activity that requires a lot of patience and skill. But is it worth spending time and energy on solving a task that can be successfully handled by a specially designed machine or device for sharpening knives?

If for knives, household tools, for example, planing devices, kitchen or cutting blades, you can try to restore the cutting edge of the blade with your own hands, then for industrial volumes even sharpening devices will not help.

You will need a powerful and productive machine.

Machines for sharpening the blades of cutting knives

The highest form of a sharp knife blade are non-rare models with chrome-plated blades and handles made of rare wood. These are more like museum exhibits or cheap imitation of them. An example of the sharpness of a blade is considered to be a carving or boning knife, which is used to cut raw meat and skins for 12 hours a day. It is under such conditions that the edge of a forged knife made of high-quality steel becomes dull unusually quickly.

For small volumes of cutting work, knife blades can be sharpened on simple machines with automatic control of the cutting edge angle.

For cutting areas of meat processing plants, professional equipment KNECHT USK 160 is most often used. The machine has a high degree of versatility, which allows you to sharpen the entire range of cutting tools, from fillet blades to cutting scissors.

Machines for sharpening cutting elements of carpentry tools

Sharpening knives for woodworking machines requires the mandatory use of specialized machine equipment. If you can sharpen a relatively short blade of a home knife or hand plane manually using a simple device, then the long and sharp blades of jointers and planers must be sharpened using a mechanical feed drive for the sharpening tool.

If you try to sharpen a tool with your own hands on a sharpening cup without support and guide slides, areas with different sharpening angles will form on the cutting edge. When processing wood, this leads to the formation of an uneven wavy surface of the board or solid wood.

Small flat knife blades can be sharpened on a simple vertical type machine.

Circular saws are usually sharpened on machines equipped with a divider and a rotary table.

Universal sharpening machines

In small carpentry shops, woodworking areas, and repair shops, universal sharpening machines are used that are capable of sharpening a very wide range of cutting tools, including sharpening guillotine knives.

As an example, we can cite the desktop model of the VZ-319 machine. Thanks to the rigid bed and correctly selected gear ratios of the mechanical drive, the unit can sharpen almost any tool, from plane blades to cylindrical cutters.

For home purposes, we can recommend desktop versions of the Tormek T7 sharpening machine. The sharpening unit comes with a huge number of attachments and accessories that allow you to sharpen any home tool.

Let's sum it up

Sharpening knives has long gone beyond the scope of craftsmanship into the category of an ordinary mechanical operation. A large number of various machines and devices, tabletop machines and automatic machines are capable of performing difficult work within a few minutes. A high-quality sharpener purchased once in your life can last for several decades, eliminating the hassle of sharpening knife blades.

Source: https://xn--b1aafeqcbxpcbxdjdebh.xn--p1ai/stanki-dlia-zatochki-nojei

Do-it-yourself knife sharpening is an important device in every home: drawings for woodworking machines

Interest in how to make a knife sharpener with your own hands arises for a reason. The consumer qualities of hand-held cutting tools are enhanced through the use of modern materials and technologies for blade manufacturing and precise factory sharpening.

At the same time, the price of the product increases, but it is becoming increasingly easier to ruin a fairly expensive item with primitive sharpening. Therefore, various household devices for sharpening knives are no longer needed only for convenience.

To understand why a knife sharpener is still needed and how to make it correctly, you will have to start with the ideology and evolution of the knife.

How to make a sharpening machine for planing knives

Knives are indispensable items in the household. In the kitchen where food is prepared, sharp knives are essential. Hunting and fishing are unthinkable without this tool.

The working part becomes dull and loses its sharpness over time. Of course, you can sharpen it at your nearest workshop. But if a household uses a dozen knives of various shapes, then frequent trips to the sharpener can be expensive.

You can purchase many devices for sharpening cutting tools in the retail chain. As a rule, the effect of their use depends on the quality, manufacturer and skill of the owner. It is almost impossible to make a knife perfectly sharp using such sharpeners.

What is the design

A manual sharpening machine is a simple device. The way it works is that the knife is rigidly fixed, and the sharpener moves along its blade.

The equipment is equipped with an adjustment that can change the angle of the abrasive in relation to the blade. A professional tool is sharpened at an angle of 20˚. Kitchen knives are processed at an angle of 30˚.

Self-assembly: stages of work and selection of materials

  • The basis for the machine is a wooden board 15–20 mm thick. This size is explained by the fact that the support must have sufficient weight. The platform is made from a piece of laminated chipboard or MDF. The shape of the base resembles the head of a key from a regular door lock, but can be rectangular. The material from which the platform is made is not particularly important. This is a duralumin or steel plate.
  • A steel vertical stand is installed in the wide part of the board. The rod is made from a round steel profile Ø8–10 mm. The entire axis is threaded.
  • To attach the rack, a hole is drilled in the board with a diameter equal to the transverse dimension of the axis.
  • A round recess Ø20 mm is made in the lower part of the platform. Its depth should hide the nut flush with the bottom surface of the wooden base of the machine.
  • The stand is secured to the plate with two nuts - top and bottom. Washers are placed under them.
  • There are other options for installing the support rod. For this purpose, special bushings are used. The main thing is that the fastening is reliable and ensures strict verticality of the axis.
  • A guide bar with a horizontal slot is placed on the stand.

    The part is a piece of bent metal profile with a T-section. Some craftsmen make it from steel strip.

  • The plank has elongated shelves (ears) on the sides. Nuts are installed in them.
  • The plate is then screwed onto the axle. By rotating the element, the desired height of its position is achieved. Setting this part parameter ensures the required angle of inclination of the abrasive stone relative to the knife blade.

The design of the bar may be different. It all depends on the imagination and capabilities of the master.

  1. Two clamping bars are installed on the near side of the platform. The elements are made from two metal strips secured with screws or bolts to the board. Clamps provide rigid fixation of the blade of the knife being sharpened perpendicular to the axis of the machine.
  2. The abrasive element is clamped in a special housing with a long metal rod.
  3. The rod is threaded through the hole in the plank.
  4. It is extremely unprofitable to use a factory-made abrasive stone. A wear mark quickly appears on the working side of the block. To get rid of it, you have to grind it down or replace it.
  5. The abrasive is moved across the blade, lightly pressing against the knife. This movement of the sharpening stone allows you to obtain a chamfer that is even in width.
  6. The platform is secured with a clamp on the workbench tabletop.

An example of making an abrasive stone

You can make a sharpening device like this:

  • Blanks with a diameter of 20×40 mm and a length of 200 mm are cut from thick plexiglass.
  • A strip of sandpaper is attached to each. Usually PVA glue is used.
  • Plexiglas has good adhesion, and the sandpaper adheres tightly to its surface.
  • On the side of the block, write the sandpaper grit number with a felt-tip pen.
  • A hole 120 mm deep is drilled at the end of the plexiglass. Its size should ensure that the guide rod fits tightly. The part is a metal rod with a diameter of about 4 mm.

Sharpening knives consists of several stages of blade processing. The bars are changed during the process. Move from coarse abrasive to finer sandpaper. The final grinding of the chamfer is done with a zero.

Sharpening curved chamfers

The ends of the blades of professional hunting knives have a curved shape. To sharpen the curved surface of the blade, the tool is fixed in such a way that the chamfer of the end of the blade falls into the working area of ​​the abrasive element. The bar rod, threaded into the hole of the bar, has freedom of movement in the transverse and longitudinal direction, which allows you to process curved chamfers without compromising quality.

Changing abrasive

Experts say that one strip of sandpaper is enough to process two knives. Just hold the block of worn paper under running water for a couple of minutes and the sandpaper will easily come off on its own. All that remains is to stick a new strip onto the dry surface of the block.

It is not necessary to use plexiglass as a working element. You can use wood, but there will be a problem with changing abrasive paper. Wood should not be constantly exposed to moisture. The block can swell and lose its shape, so craftsmen prefer plexiglass.

The video below shows one of the options for a sharpening machine:

Sharpening various cutting tools

In the household, in addition to ordinary knives, there will always be tailor's, stationery and manicure scissors.

With a slight improvement in the knife mounts, the scissors can be fixed to the machine platform. Renewing old tools with dull cutting edges is a problem that is always relevant and requires a solution.


If your household does not need special filigree sharpening of cutting tools, you can get by with a homemade electric sharpener. To manufacture the device you will need an electric motor. The engine from an old washing machine is quite suitable for a sharpener.

At your nearest workshop, you can order special bushings for attaching the emery and grinding wheel to the motor shaft. The ideal solution would be to install a transformer that regulates engine speed.

An electric sharpener can be bought in a retail chain. The factory-made device has two circles on the shaft on both sides of the motor. Without changing the wheel, you can sharpen the knife and polish the chamfer of the blade.

Professional machines

Such equipment is installed in workshops for the production of cutting tools. Blanks for knives are processed on planing machines.

A blade chamfer is formed from metal using high-strength cutters. The knives are finally finished on units with grinding wheels.


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