Comparison Bosch GBH 180-LI Professional 0611911020 vs Ryobi R18SDS-0

The energy transmitted by the perforator to the material being processed upon impact; the higher this indicator, the stronger and more powerful each individual blow.

First of all, we recall that the energy of impacts is directly related to their frequency: an increase in frequency leads to a decrease in energy. Therefore, for models where the number of strokes can be adjusted, this paragraph usually gives the maximum energy achieved at the minimum speed of operation.

In general, higher impact energy improves efficiency when working with hard, stubborn materials, but requires more motor power (especially if it has to be combined with a high frequency). Therefore, it is worth choosing according to this parameter, taking into account specific tasks. So, for occasional use in everyday life, an energy of 2 J or less is enough, for home repair work of medium intensity, at least 3 J is desirable; a power of 4 J or more is already considered high; and in some industrial-grade perforators, this figure can reach 30 J.

The number of beats per minute provided by the punch. For models in which the beat frequency can be adjusted, this item indicates the entire adjustment range, for example "1600 — 3000".

High impact frequency, on the one hand, increases the productivity of the tool and can significantly reduce the time required for work. On the other hand, with the same engine power, an increase in the number of strokes per minute leads to a decrease in the energy of each stroke. Therefore, among heavy performant devices, a low frequency is often found — up to 2500 beats / min and even lower. And the ability to adjust the frequency of impacts allows you to adjust the hammer to the specific situation, depending on what is more important — productivity or the ability to cope with hard, stubborn material. For example, for old crumbling brickwork, you can set the speed higher, and for working with stone or dense concrete, it is better to reduce the frequency of impacts by directing engine power to increase the energy of each impact.

Summing up, we can say this: when choosing a perforator, you should focus on both the number of strokes and the impact energy. Detailed recommendations on this subject for specific situations can be found in special sources.

The speed of rotation of the working equipment provided by the rotary hammer. Usually, this indicates the speed at idle, without load; rated load speeds can be further specified in the characteristics (see below), but this is rare, and this parameter is still considered the main characteristic. It is also worth mentioning that in the presence of a speed controller (see "Functions"), the maximum speed value is given here.

When working in the main mode — drilling with impact — the rotation of the equipment is used mainly to remove waste from the hole, and the revolutions here are of no fundamental importance (they can be very low). Therefore, it is worth paying attention to this indicator mainly in cases where the rotary hammer is planned to be often used for conventional drilling, without impact. And here it is worth proceeding from the fact that high speeds increase productivity and contribute to accuracy when working with some materials, but reduce torque (compared to tools with the same engine power). So for heavy work with hard, stubborn materials, relatively "slow" tools are usually better suited.

Note also that drilling is not the main task of rotary hammers; therefore, their rotation speeds are noticeably lower than those of the same drills. On the other hand, in this case, low speeds are often compensated by powerful engines and high torque, which makes it possible to effectively drill holes...of a fairly large diameter, including using crowns.

The maximum torque developed by the rotary hammer.

Without going into too much detail, torque can be described as the working force of a tool. For drilling with impact, this indicator is not of fundamental importance — we recall that the rotation of the nozzle in this mode performs an auxiliary function, and the key parameters are the frequency and energy of impacts. But with traditional drilling, without impact, the torque directly determines the effectiveness of the tool. The higher it is, the more powerful the impact on the material being processed, and the larger the drilling diameter this model can provide. However tools with similar drilling diameter limits may differ in torque; in such cases, you should assume that more operating force requires a more powerful motor and affects the cost, but it contributes to reliability and provides additional guarantee in case of some abnormal situations.

The location of the hammer motor is indicated relative to its standard operating position — when the drill is directed horizontally.

— Horizontal. Also, this arrangement can be called longitudinal, because. the engine is placed along the body of the perforator. Due to this, such a tool is more compact than vertical motor devices. On the other hand, horizontal motors are subjected to more severe loads, which makes it difficult to use this arrangement in high power rock drills. As a result, tools of this type have relatively low power and productivity, most of them are designed for relatively simple work.

— Vertical. The vertical arrangement assumes placement of the engine perpendicular to a working nozzle. This significantly affects the dimensions of the unit. On the other hand, vertical rock drills use gearboxes that reduce the load on the engine, which makes it possible to create powerful performant tools. Therefore, most professional-level models designed for intensive use in difficult conditions use a vertical engine layout. But also the predominant part of them without reverse.

The maximum diameter of a tool that can be used with a rotary hammer when drilling in wood (and, accordingly, the maximum diameter of the resulting hole). With a large drilling diameter, the loads on the device increase, and some models may simply not be designed for them (despite the technical possibility of installing tools of the appropriate diameter), as a result, it is not worth exceeding the maximum specified diameter, because. this may damage the instrument.

The maximum tool diameter that can be used with a rotary hammer when drilling in concrete. See "Maximum drilling diameter in wood" for details.

The name of the battery that is compatible with the device. It helps to buy a spare or find a suitable one in case of a breakdown of the main one.

- Additional handle. The puncher has an additional front handle, usually located at the base of the cartridge. This handle can be non-removable or removable, rigidly fixed or movable. Holding with two hands for two handles is much more convenient than for one and the body, because. allows you to optimally distribute the load on the hands; this is especially important for long-term work and the processing of "heavy" materials.

- Depth stop. A device that allows you to make recesses of a strictly defined depth at once, without constant measurements and without the risk of drilling deeper than necessary. It usually looks like a rod attached to the body of the puncher parallel to the working tool. In use, this rod extends to such a length that when the desired depth is reached, it rests on the surface of the material being processed, preventing the drill from moving further.

- Chisel. Complete nozzle for impact work with a perforator in the manner of chasing, leveling hard surfaces, beating tiles, bricks, concrete, etc. For different tasks, various types of chisels are produced - flat, spade, groove, crushing peaks with a sharp tip.

— Bur. The presence of a drill in the delivery set of a tool designed for processing various hard materials due to drilling with impact. The purchase of such a set eliminates the need...to look for a drill separately, however, the characteristics of the complete nozzle must be clarified before purchase, because. they may not meet the requirements of the buyer.

- Charger. The presence of a charging unit in the configuration allows you to charge the batteries. Accordingly, for models with batteries, this accessory is necessary to power the battery. However, there are models without a charger. And punchers with it may differ in the model of the charger, the name of which will allow you to learn more about its characteristics and, if necessary or as needed (breakdown), buy a similar one.

- Case included. The presence of a special case in the delivery set, which facilitates storage and transportation: it provides protection against shocks and adverse conditions (moisture, frost), is equipped with a special carrying handle, in addition, along with the punch itself, a set of working tools can be placed in the case, replaceable cartridges, etc.

- Dust collector. The presence of a special dust collector in the delivery set of the perforator. As the name implies, it is designed to collect the dust generated during operation, which can otherwise create a significant inconvenience. Usually looks like a bag or container attached to the body; can be either replaceable (thrown away with the collected garbage) or permanent. The dust collector slightly increases the weight and dimensions of the puncher, however, if necessary, it can be removed.