Repair, repair, repair. He gives birth to so many new ideas. In general, the time has come to hang a shelf in the already clean room, where cement and plaster dust is extremely undesirable. You need a vacuum cleaner attachment that will make the process of drilling holes in the wall a dust-free operation. I run to my laptop, quickly sketch out the model, start printing on the SkyOne 3D printer, and within an hour we’re already using:

After the first shelf I was almost satisfied with the attachment. Why almost? Because it’s inconvenient to hold it with one hand and drill with the other. The nozzle must fix itself on the wall; to do this, you need to increase the area of ​​the “suction cup”. I calculated approximately what it should be like: my vacuum cleaner, which I use for construction work, can create a vacuum of 16 kPa according to the passport, but this is at zero air flow; we will only partially limit the flow by making a suction hole with a diameter of 20 mm. I think with this reduction you can count on 6 kPa. Let's convert it into more convenient kg/cm2 (1 Pa = 0.0000102 kg/cm2) and get 0.0612 kg/cm2. I think a suction force of 2 kg will be enough to fix the attachment well on the wall, but not tear off the wallpaper. As a result, you need to ensure a suction cup area of ​​at least 32 cm2. Yes, the calculation is an estimate, imprecise, but I will then run the model through a flow calculation program, it is much faster than calculating manually.

Back to modeling. I tried to make the model so that it would print without supports.

I’m running it through the calculations, it’s interesting to know the flow speed in the suction and vacuum zone above and inside the nozzle.

The average flow speed in the drilling zone was about 70 km/h, I think this will be enough to capture dust from the drilling zone.

The average pressure above the nozzle was 101.1 kPa, below the nozzle – 95.4 kPa. The pressure difference is 5.7 kPa, lower than we wanted, taking into account the area of ​​32.7 cm2, the result is 1.9 kgf of suction. Taking into account the wear of the filter in the vacuum cleaner and air leaks on the sides, we will get 1-1.5 kgf, I hope this is enough.

A rotary hammer is very often used to process materials, the drilling or chiseling of which produces a huge amount of dust. These conditions contribute to the wear of the tool and its aggregate parts. Precisely with the aim of reducing negative impact on a hammer drill and a dust collector is created. If we talk about factory devices, they are active and passive. Active ones have their own drive, but the cost of the tool increases, and significantly. Passive ones take power from the engine.

Everyone decides for themselves whether to install dust collectors or not. Some people use a vacuum cleaner, but this is not always convenient; you have to hold the hammer drill with one hand. There are many others homemade devices, which we will discuss below.

Homemade dust collectors

For a long time, paper and tape were considered the simplest dust collector - simpler design there simply isn’t and there won’t be. From these materials you can make a simple envelope, which is glued in place of the future hole. The dust settles inside the envelope, but if the drilling takes place vertically, you can use a paper cup. The disadvantages include the fact that some of the dust will still fly out under the influence of air. The advantages include simplicity and low cost.

Often the cut off bottom of a plastic bottle is used.

If we look at the design of the rotary hammer, we will notice that its engine is equipped with a fan for cooling during operation. This device can be used to make a dust collector on a hammer drill. To do this, you can take a hose and a plastic polypropylene corner for a 20 mm pipe and drill a hole in it for a drill. Then you need to take a container for dust and make a hole in it for the suction device of the hammer drill. Dust goes into the box when drilling.

Factory type dust extractor

A factory-type dust removal system can be included or sold separately - it all depends on the wishes of the buyer. The undoubted advantages include replacement filters, the ability not to violate the integrity of the instrument, ease of use. There is one significant drawback - the device is powered by the main motor of the hammer drill.

Self-contained dust removal system

An independent means, albeit primitive, includes a vacuum cleaner hose. It is quite easy to use and does not require any financial costs. The hose can be placed next to the hole. But there are disadvantages to this method. Drilling with heavy hammer drills will require assistance, and some dust will still penetrate into the room.

Important! IN Lately so-called vacuum dust collectors appeared. They are made of durable casing and last for a long time.

Conclusion

To summarize, it is better to choose, of course, factory dust collectors, since they are convenient, compact and do not require additional work for manufacturing and installation. This is an option for those who prefer not to skimp on technical means. For those who prefer to put their engineering skills into practice, you can use homemade options. True, they will not get rid of dust 100%, but this is a less expensive method, although more labor-intensive.

Modern construction tools there is a mass additional functions. They allow them to stand out from their peers and attract buyers. In addition to the fact that modern rotary hammers combine the functions of both a jackhammer and a drill, they also allow you to quickly change chuck attachments, select an operating mode, and control the quantitative indicators of rotations and impacts.

In addition to those listed, among the additional functions you can often find a built-in vacuum cleaner. This characteristic deserves closer attention.

What is it for?

Many people don’t even think about why the vacuum cleaner function is needed in a rotary hammer.

It's no secret that dust appears during the operation of a rotary hammer. Its quantity and composition depend on the material with which the work is carried out. Some may consider the presence of dust not such a big inconvenience, but it should not be underestimated.

• Dust also contains very small particles that settle on human skin and clothing. If they are constantly inhaled, respiratory diseases may occur, as well as allergic reactions. In addition to a vacuum cleaner, you must use a respirator and protective clothing.
• This affects human comfort. Working in dust is not very pleasant, and it is simply impossible to hold a regular vacuum cleaner and work with a hammer drill at the same time. For people whose daily work is connected with this tool, the presence of a dust collector in it will greatly facilitate the work.
• Small particles of dust negatively affect the operation of the construction tools themselves. For example, the boot on the cartridge may fail.
• After any work performed with a conventional hammer drill, thorough cleaning is required.

Even if you only need to drill a couple of holes, you will then have to wipe off dust not only from the floor, but also from other surfaces. To reduce this step to a minimum, choose a model with a dust collector.

To make working with tools comfortable, do not neglect the function of the built-in vacuum cleaner. It will not be superfluous even with minor modifications, but professionals simply need it.

Kinds

All rotary hammers with different types dust collection systems can be divided into professional and amateur (for home use). Due to their high power and weight, professional ones are designed for certain types of work. Tools for regular use often combine several modes; they are less powerful and light in weight. Naturally, the cost of the former is several times higher.

Only a person who uses a hammer drill regularly, on a professional basis, can afford to buy them. With the help of the latter, it is quite possible to make simple repairs with your own hands or periodically make several holes for economic needs. Devices for collecting dust and fines construction waste may be different designs.

• Special dust removal system, to which you can connect construction vacuum cleaner. Their main advantage is their high power and ability to absorb large amounts of debris. Portable construction vacuum cleaners do not greatly affect mobility and convenience. Bulkier industrial vacuum cleaner models often have outlets for power tools, which is also convenient. In this case, each device operates autonomously.
• Built-in vacuum cleaner, the operation of which is directly related to the hammer drill engine. It can be removable completely or only in part of the container (bag) for collecting garbage. Such a dust collector partially conceals the power of the hammer drill and affects its wear resistance. This system is suitable for tools with light to medium performance.
• Dust collectors. The essence of which is that they prevent small particles from scattering into different sides and detain them inside the chamber. Usually these are plastic nozzles in the form of a cone (they are also called dust caps) or a cylinder. They come in a solid form or in the form of a ribbed cuff that can be slightly compressed to provide a snug fit. Some of them also have an input to which you can connect the hose of a regular household or construction vacuum cleaner. The choice of such dust collectors depends on the type of cartridge, model of the tool and the maximum possible hole parameters (depth and diameter).

In addition to the above items, there are universal devices suitable for both hammer drills and drills and screwdrivers. They are attached to the wall like a suction cup, and a construction vacuum cleaner creates a traction for dust.

Popular models

To make the advantages and disadvantages of rotary hammers with vacuum cleaners more clear, let’s look at several popular models.

• Bosch GBH 2-23 REA has proven itself to be exceptionally good. The design of the vacuum cleaner is easily removable. Inside you can see a filter and a container for collecting small construction debris, which is quite easy to clean. Without a filter, the tool works like a regular hammer drill with two modes. It copes well with the stated functions, holds more than 90% of dust and is convenient for transportation.

The only criticism was that when connected, such a unit is quite heavy and holding it is not as convenient as without additional parts. Yes, and its price is somewhat overpriced.

• MAKITA HR2432 captivates with reliability and good characteristics. The dust collector can be detached - then you will get just a good hammer drill. The bag is very spacious, even with intensive work it can be emptied every two days. Unlike other analogues, debris does not spill out when the unit is turned over. The convenience of working with the ceiling is especially noted - dust does not fly into the eyes and cleaning is practically not necessary.

The complaint is that it only picks up small particles. Large pieces will have to be removed by hand.

The storage container is large enough to allow you to store the hammer drill when assembled.

These two models with a dust extractor are not the only ones, there are not many of them on the market, but there is a choice.

However, the choice of tool depends on the planned work.. To hang several pictures, you can take the first model. For larger actions would be better suited second.

How to do it yourself?

The choice of a dust collector largely depends on its cost. It is not always possible to do expensive purchase. And when purchasing, it is difficult to take into account all the nuances.

If you have a hammer drill without a vacuum cleaner, you can purchase a dust collector separately. Or do it yourself without spending effort or money.

The simplest option for a horizontal position of the hammer drill is to make a pocket in the place of the future hole. Plain paper and masking tape work well for this.

When the hammer drill is in a vertical position, when debris flies from above, this method is not suitable. Here you can use any plastic utensils– be it a glass or a cut bottle. In the bottom you need to make a hole equal to the diameter of the drill. During operation, if the length of the drill is insufficient, the cup is crushed, but keeps the bulk of the debris inside.