Sharpener: how to choose the equipment for home correctly?

When it comes to selecting a sharpening machine and determining which models to focus on, it is essential to thoroughly examine the technical specifications. Key factors to consider include motor power and the size of the grinding wheel. The article provides valuable advice to ensure a successful purchase.

Basic technical characteristics

In order to comprehend the process of selecting a sharpener, one must familiarize themselves with the primary technical specifications. These factors comprise of power capabilities, maximum revolution capacity, and wheel parameters.

Power

This is the primary indicator that showcases the device’s potential productivity. If you’re looking to select a professional sharpening machine, it’s advisable to consider models with a minimum power rating of 300 watts. These models can handle heavy workloads without causing the motor to overheat.

If you only need to sharpen small tools like knives, woodcarvings, chisels, or thin drills, excessive power is not necessary.

Therefore, the main method of choosing an electric sharpener for home use is to examine its power rating. A range of 150-250 watts is sufficient for most home applications. However, if you also need to sharpen scythes, axes, or shovels, then a more powerful device with at least 300 watts is necessary.

Maximum number of revolutions

There is another way to select an electric sharpener which involves considering the maximum number of revolutions. Normally, a range of 2700-3000 revolutions per minute is sufficient. If the speed is lower, it leads to decreased productivity and the motor operates with idle.

On the other hand, if the speed is higher, the blades and other items to be sharpened may heat up excessively. Nevertheless, a higher speed is ideal for sharpening components made of hard alloys. To accomplish this, fine-abrasive (diamond) discs are utilized.

Their grains are extremely fine, thus resulting in a significant decrease in productivity when used at the standard rotational speed. Consequently, hard-alloy materials – like the solder on a circular saw or the drill head for a perforator – are sharpened at higher frequencies of up to 15000 rpm. This process is carried out using diamond disks.

Seating diameter of the wheel

When deciding on a home sharpener, it is advisable to choose a tool with a small seating diameter. This power is sufficient for sharpening common household tools.

However, it should be noted that on such a shaft, it is not possible to install abrasive, heavy wheels. Even a slight deviation will cause the shaft to bend and the disc to become misaligned. This will result in a decrease in the quality of sharpening.

For professional purposes, it is recommended to purchase a sharpener with a larger seating diameter. Such wheels are suitable even for low-power devices. Due to their larger dimensions, there will be no runout, resulting in a very good sharpening outcome.

Wheel diameter

This indicator is directly related to the size of the objects that need to be sharpened. For instance, for knives, a minimum diameter circle is suitable, while for axes, a significantly larger parameter is needed.

It’s important to keep in mind that large abrasive circles have high inertia. As a result, they provide uniform grinding and distribute the load evenly on the engine mechanism, which prolongs its lifespan.

Another factor to consider is that the larger the wheel diameter, the more powerful the machine and the higher its price. Therefore, if you’re looking to choose a sharpening machine for home use, it’s better to opt for devices with smaller diameter circles.

Circle thickness

The thickness of the wheel also varies depending on the blade size that needs sharpening. For instance, when sharpening knives and chisels, a thinner wheel is adequate. However, when sharpening a shovel or scythe, a wider wheel is necessary.

However, it’s important to note that thicker wheels tend to lose their shape more quickly when being sharpened, resulting in an imbalance. Consequently, these wheels need to be replaced more frequently. Additionally, thicker wheels add mass, requiring a more powerful motor.

Additional parameters

In order to understand how to select an electric sharpener, it is important to consider both the main criteria and additional parameters. These additional parameters are equally important as they aid in the ease of use and prolong the lifespan of the sharpener:

1. A protective cover and a screen with protection are essential elements that ensure safe operation during sharpening. This is because the grinding wheels are made of fragile materials and can potentially shatter into fragments if damaged.
2. Illumination is provided by a lamp on a flexible arm. It is also possible to connect an individual light source to each grinding wheel.
3. The work platform is a surface that can be adjusted to various angles of inclination. It is used for sharpening chisels, gouges, and drills.
4. The option of surface support is particularly important when it comes to sharpening large tools. It is also suitable for working with small cutting objects.

How to choose a sharpening machine: practical tips

If you wish to select the right emery, sharpening machine, it is important to consider the intended use – how frequently and which tools will be sharpened. The following are key recommendations for purchasing:

1. If you only need to use the device occasionally, say 2-3 times per year, it is advisable to invest in a budget-friendly model priced between 2000-4000 p. These models operate for just a few minutes and offer sufficient performance. Furthermore, such tools are not too expensive.
2. If you require a versatile sharpening device, it is recommended to choose models featuring a reducer and a container for the option of "wet" sharpening.
3. At times, there may arise a need for a reliable sharpening device that can be used consistently. For professional purposes, it is advisable to invest in compact and powerful devices, even though they may be more expensive, typically ranging from 3000 to 6000 rubles.
4. Alternatively, one can opt for a powerful machine that includes an engraving feature. In such cases, it is recommended to consider the "2 in 1" sets available in the market. These sets also fall within the price range of 3000 to 6000 rubles.



When it comes to selecting an electric sharpener, it is advisable to personally examine the primary models. Opting for products from reputable brands with ample power is the best course of action. This way, they will not consume superfluous energy and will have a satisfactory lifespan.