Knife sharpening on a belt sander. 3b. Special file

Correct knife sharpening

Any knife, whether it’s a brand name and expensive, a hunting knife or a work knife for your workshop, will blunt over time. The question of its proper sharpening arises.

The knife itself, lying in its sheath, is not blunt, it gets blunt during use.

  • Improper storage conditions;
  • cutting not on the board, but on hard surfaces;
  • misuse, such as cutting wood with an inappropriate knife;
  • improper operation, etc.д.

To keep using a knife, you need to sharpen it from time to time. There are many ways of doing this, let’s consider the most acceptable of them.

Electric sharpeners

Progress is inexorably moving forward, and electricity is becoming more and more common in our lives. An enormous number of electric devices and tools designed to ease human existence have been invented, there are even electric knives, but in this case we are interested in devices for electric sharpening of ordinary steel knives, but even these devices are incredibly numerous. In the home, one of the following is usually used:

Desktop sharpener

What do you call them? grinders, sharpener, straightener-turner, sharpening machine, sharpening machine, etc.д. Sharpening machines are used mainly for sharpening all kinds of construction tools, but for ordinary kitchen knives such machines are quite suitable. All safety precautions must be observed when working on such a machine.

Carpentry machine

The design of some carpentry machines allows the saw blade to be replaced by the grinding wheel. However, no protective guards and shields for such machines are not provided, and therefore sharpening knives on these machines need to be with the utmost care necessarily wearing safety glasses.

angle grinder

(angle grinder). Initially, this power tool is not designed for sharpening knives, however, to sharpen the knife on the grinding wheel of the angle grinder is quite possible, but again, it is necessary to observe all safety precautions when working with the angle grinder.

Electric belt sander

The disadvantage of the above-mentioned methods is that the tools mentioned above are construction tools and take up a lot of space, so it makes no sense to buy them specifically for sharpening knives. And if any of the above is already in the household, then no one forbids the use of it. For example in the country to sharpen knives, hoes, grass scythes scissors and angle grinder and belt electric grinder.

Electric grinder for kitchen knives

There are more and more of these sharpeners lately. They are made specifically for sharpening kitchen knives, have a relatively small size and it is safest to sharpen knives on such sharpener. There are a lot of models of electric sharpener for kitchen knives, from simple and cheap price of 10-15 (A), to semi-professional, price of 100-150 (B), allowing to perform sharpening in several steps. Electric kitchen knife sharpener looks something like this:

Picture 1. Electric grinders for kitchen knives, scissors

To sharpen a knife with such an electric sharpener, one should insert the knife with the cutting part into the appropriate slot and move it back and forth several times.

Sharpening the blade by hand

If you do not have a sharpening machine, this is not a reason to despair. After all, you can sharpen your knives back to sharpness with more affordable tools. Of course, there are special hand sharpeners. But abrasives that are used in carpentry and joinery will also do. This is sandpaper and sharpening stones. Let’s tell about how they can be used to sharpen the blade.

How to sharpen a knife to razor sharpness? This can be done by hand with minimum effort. You need a wooden block and different grit sizes of sandpaper, e.g. 320 and 1000. Tape both strips of sandpaper to the edge of the block on opposite sides and secure with tape. Begin the sharpening with an emery cloth with 320 grit. The blade should be placed at the proper angle with respect to the surface of the stone and across it. You can determine the angle of the blade as described above. To sharpen the blade, move left and right, gradually moving from the tip of the blade to the handle. This is how one side of the cutting edge is machined. Then turn the knife over and do the same with the other edge. Already after such sharpening the blade will become very sharp. it will be able to cut a sheet of paper. And finally, the finishing sharpening is carried out on a paper of 1000 grit, glued to the other side of the sharpening stone.

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Tip: to achieve a perfect result, you can polish the blade. You will need a piece of leather, mounted on a block and smeared with goji paste. The movements performed are the same as for sandpaper. As a result you will get a razor-sharp blade and will be able not only to cut straight paper, but also to make curvilinear cuts.

Sharpening stones for knives can be made of different materials. They come in abrasive, ceramic, natural. It is easiest to work with granular stones, which were used by our parents and grandfathers in Soviet times. Look, maybe you have such a bar at home. To sharpen the knife, proceed in the same way as with sandpaper.

Tip: Soak the block in water or soapy water before you start. So the blade will slide better, and metal dust will not clog the pores of the abrasive surface. It is advisable to wet the rubbing surfaces during the sharpening process to remove the sharpening waste, and at the end, to wash the block.

knife, sharpening, belt, sander

The initial grinding should be done on a stone with coarse grit, and the finishing should be done on a fine grit surface. Gently feel the blade. There should be no burrs on it. If you wish, you can coat the blade with felt and goi paste.

What kinds of grinders are on sale

Grinders equipped with a drive are common on today’s market. The range of different models is quite broad. They differ from each other in their design, power, and cost. These are the criteria to be considered when choosing a model.

Belt grinders can be industrial and for home use

It is also worth considering the operating affiliation of such units. Some of them are used for works of increased complexity, which it is not possible to perform on manual grinding equipment.

The simpler versions are ideal for sharpening knives. Grinder for this purpose can be purchased in the online store, which is very convenient. Buying such equipment on the Internet has one disadvantage. the impossibility of consulting with the seller. Thus, depending on the operational affiliation there are differentiated units:

All devices of this type have a drive mechanism. However, the power of the drive can be different. This is another criterion by which belt grinders are differentiated. It is also worth noting that the belt, equipped with an abrasive material, can have different lengths. The width of this element is also different.

The units differ in design, power, cost

When choosing a specific device, it is worth paying attention to its brand. The most popular brands combine reasonable cost and good quality. The largest number of positive reviews have tape grinders “Levsha” and “Mastak”.

Speed. a characteristic that affects the speed of movement of the abrasive belt. The lower this parameter, the lower the efficiency of the device. During the work it is often necessary to reduce the rate to avoid the risk of overheating the belt and the workpiece being processed.

What is Grinder: design features of the unit

Such a machine has a simple device. Configuration may vary depending on the model, but the basic elements remain the same. The simplicity of such units is the main reason that they are often made on their own from improvised means. At home such a machine can be made on the basis of an ordinary electric motor from an old washing machine. The standard Grinder includes the following structural elements (in addition to the motor):

A standard Grinder consists of a belt tensioning device, rollers, a frame, a stop and a clamping plate

The last part is very important, because it eliminates the possibility of belt break, which can occur under the influence of excessive pressure during the processing of the workpiece. Photos of grinders allow you to visually assess their simplicity and advantages, as well as quickly understand the design of such units.

The simplest versions of such equipment include in their structure only one leading roller. Professional models, which can be found in small industries, may have 2 or 3 rollers. In this case, there is a certain regularity: the more rollers the device has, the longer its abrasive belt.

Belt length is an important criterion, because it determines the duration of operation of this consumable. Short belts need to be changed frequently, which is not very convenient. In turn, the use of a longer consumable allows not only to reduce the frequency of friction, which affects the service life, but also to reduce overheating. In any case, this figure is selected depending on the operational purpose of the device. If you rarely use the device for sharpening knives, axes and scissors, there is no need for a long belt.

Such equipment is indispensable for knife makers. Belt grinders can handle a large amount of work. During operation of the factory machine, the workpiece is resting against a table fixed to the frame, allowing for more accurate grinding. It is also worth noting that the industrial versions are equipped with a special glass that performs protective functions, protecting the face of the master from sparks.

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Often the belt grinders are made by their own hands because of the simplicity of their design

Please note! Over time the grinding belt loses its former technical characteristics and stretches. To solve this problem, the factory equipment has a tensioning mechanism, through which the consumable is adjusted.

Separately, it should be said that on sale you can meet universal equipment that combines the characteristics not only of the grinder, but also of other sharpening aggregates. The grinder sharpener does not provide for the possibility of disabling a separate mechanism. Its main disadvantage. high cost.

The principle of the grinder: how grinding is done

The principle of operation of such units is quite simple. Any person without special knowledge and skills can understand it. At the heart of the operation of this device is an electronic motor. When it is turned on, the rollers are activated. It is important to remember that there can be only one leading roller. The others are slideways.

The resulting thrust is transmitted to the abrasive belt, which drives the latter in motion. The design of such equipment includes the ability to regulate and control the driven rollers. This greatly simplifies working behind the machine. The Belt Grinder produces a lot of dust during use. This is especially noticeable when processing workpieces made of wood. This problem is solved simply: it is enough to use a hand vacuum cleaner or any equipment for blowing.

Principle of the Belt Grinder for grinding and sharpening

Users note the convenience of using such a table machine. Reviews are predominantly positive. In the case of using a homemade device, it is recommended to adhere to all the necessary safety rules. The operator should keep in mind that the lack of a shield on a homemade machine can cause dust or sparks to enter the eyes. Therefore, when using a grinding machine made by your own hands, you should prepare protective glasses in advance.

Over time, the abrasive belt, as mentioned above, wears out and stretches. There are several tensioning mechanisms that level out this problem. Such a system may be based on a spring or a special locking element.

How to sharpen knives in a shearing machine

To properly sharpen the blades in a clipper machine, it is important to follow a number of conditions:

  • do it when the part is removed from the main body;
  • first determine the sharpening angle;
  • during the procedure, periodically measure it with an angle gauge, so as not to remove more material than necessary;
  • when using electric tools with a rapidly rotating wheel (grinder or lathe) to hold the knife not by hand, but with a magnetic or other holder, so as not to fear injury and not to shift the blade because of this.

Watch the video on how to properly sharpen a hair clipper machine:

Sharpening barber blades can also be done at home, when the tool is inexpensive and easily replaceable. If it’s a quality professional, it’s better to entrust the procedure to a master. Go to a large service center, so there is a better chance that the machine will not be damaged.

Where to start

First of all, you need to properly organize the working space. If you are going to work in a workshop, there must be a workbench that can securely hold your workpieces. When you have to treat surfaces indoors, such as walls in a wooden house, it is important that there are no unnecessary objects nearby. A construction vacuum cleaner comes in handy when sanding wood, it makes the process cleaner. Connect its hose to the spigot on the body of the tool, and wood dust won’t hang in the air. It’s convenient and efficient!

Take care of your safety. Even good brushes can have flyaway bristles. High-speed spinning wire can pierce skin on hands or face. To avoid this, wear thick clothing that covers arms and legs. You should wear a face shield and gloves on your hands. A respirator is a good idea, even if you are working with a vacuum cleaner.

If you already know what kind of workpieces you are going to process with the brush grinder, then choose the right tooling at once. In this article you will find a detailed review of the most common types of sharpening brushes to help you make the right choice. You can learn more about it a little later.

Review of the best models of sharpeners: Profil knife sharpening machines

Domestic company “Profil” offers a wide range of sharpening tools to give your blade almost its original sharpness. Designs enable multi-step sharpening by replacing coarse abrasive with finer abrasive, resulting in a smooth blade.

Depending on the chosen model, you can sharpen a tool for any purpose, and the quality of home sharpening is not inferior to professional sharpening. These devices, unlike conventional machines, do not tear off the steel base, and grind and peel the blade without unnecessary damage.

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The “K03 Standard Set” includes all tools necessary for sharpening, straightening and finishing of blades

Among the most popular sharpening kits, the “K02 Start” kit stands out, The unit is equipped with an automatic rotary angle locking function. The only thing that might not be enough is a set of abrasives. An integrated bearing group makes it possible to turn the clamps by 180˚, and a flat spring ensures the reliable fixation of the knife in the clamp. For convenient replacement of the clamps the body is equipped with a setting node.

The next most common set is the “K03 Standard Set”. This model is designed to maintain a given angle throughout the sharpening process. The kit has all the necessary tools to perform sharpening, straightening and finishing of knives.

“K03” also features an upgraded rack and pinion elevator for easy use. Auto-clamping mechanism keeps the blade securely in a horizontal position, which is especially important when performing the finishing stage. All parts are conveniently stored in the branded box.

Rating of the best electric knife sharpeners

Elitech CT600C is considered a popular electric tool for sharpening, with 600 watts of power, which is enough to work with a variety of knives, including carpentry equipment. The sharpener assumes the use of large 200-millimeter wheels, the planting diameter reaches 32 mm. Specialists warn that if overloaded, the motor of the device is able to heat up very quickly.

To work with thin blades, the Elitech CT600C machine model is equipped with a magnifying glass

The machine is equipped with a special light, which adds to the comfort of use. For work with thin drills, a magnifying glass above one of the wheels is available. Coolant reservoir included.

Considerable weight of the construction (12 kg) ensures the absence of vibration of the emery, even at high revolutions. Assembly quality is at a high level.

knife, sharpening, belt, sander

Grinder “Kraton BG 560/200” is characterized by a relatively high power. 560 watts, which allows the use of large 200-mm circles. Shaft grinding machine is originally designed for 16 mm, but if desired there is a possibility to increase the blade diameter to 32 mm (using an adapter). Among the disadvantages, users highlight the vibration at work, even despite the large weight of the device. 13 kg.

knife, sharpening, belt, sander

As the wheels wear out, the imbalance is able to increase, but this can be said about almost all models of sharpening machines. The device is generally designed for 15-20 minutes of continuous operation, after which it is recommended to let the motor cool down to avoid severe overheating.

Knife sharpening machine “Kraton” BG 560/200 has a power of 560 watts and large 200-millimeter circles

Important! The biggest disadvantage of the operation of sharpening machines, whose wheels are coaxed with the motor. poor cooling of the motor. Therefore, it is not recommended to use such devices for a long time without stopping.

Another popular household device for sharpening knives is considered a model of the firm “Vikhr” TS-400, the power of the device. 400 watts. Despite the low power, the manufacturer has equipped the device with grinding wheels with a diameter of 200 mm, but the seat diameter is 16 mm. Because of the low power consumption the sharpener can be used continuously for 30 minutes without overheating, but it is important not to press the blade too hard against the wheel. Weight of the unit is 9.2 kg, optional backlighting included.

A selection of the most popular semi-professional sharpening machines

One of the best machines for sharpening circular knives and saws made of hard materials is considered JMY8-70. The machine can be used for bevel sharpening and processing of tools on both sides. The holder is capable of changing the position within a range of 85 degrees. Molded base with rubber inserts ensures accurate processing, and the sharpening process is not accompanied by excessive noise or vibration. Work adjustment is manual, and the sharpening angle of the tool is maintained by the use of bearings in the guide mechanism and the inclined holder.

For more convenient operation, the kit includes adapters to match the seating size of the sharpening disc and an additional fixture. The inclination of the working table can be changed from 30 to 45˚ Other technical characteristics:

One of the best grinders is the Tormek JMY8-70

  • Power. 250 W;
  • The number of rotations per minute is 2850;
  • Diameter of saws is 80-700 mm;
  • diameter of the sharpening disc. 125 mm;
  • weight. 33 kg.

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