During construction or renovation, it is often necessary to drill holes in concrete and stone with a hammer drill. In order for the drilling process to proceed quickly, it is necessary to select the correct concrete drill for the hammer drill. Many people mistakenly think that they can make holes in such material with simple drills. But in fact, during the drilling process, ordinary consumables quickly bend and become dull. This article will discuss the criteria for choosing a drill for a hammer drill. To make it easier to understand, the most popular blastholes from well-known world brands will be listed today.
Types of boreholes
Drill and drill: what is the difference
A drill differs from a drill in that it drills holes through impact-rotational movements. Thanks to this, it is possible to make deep holes (up to 1000 mm) in high-strength structures, which are extremely problematic and often impossible to drill with conventional drills.
True, in the process of such drilling it is often necessary to make reciprocating movements to extract dust from the hole being made. The hole tip is generally equipped with a crown (most often consisting of several cutting segments), which significantly increases its service life.
Important! The most important thing is that the drill does not bite while drilling concrete, otherwise it will break or jam. To extract a hole, some types of hammer drills provide reverse operation. It is also necessary to regularly lubricate the shank so that it wears less.
The drill differs from the drill and has a shank (the part fixed in the chuck). The drill is mainly fixed by movable cams. A special cartridge with locking balls is provided for drill holes. Today, drills with a chiselling function are sold on the market, but they are ineffective in working with hard materials.
SDS Plus Size Chart
In simple words about how to choose a drill for a hammer drill
Remember: everything that is for a drill is a drill, for a hammer drill is a drill. Although a hammer drill “drills,” it does it with “chiseling,” which results in drilling.
Therefore, the “drill” for a hammer drill is a drill. It drills, therefore it is a drill. Even though it looks like a drill. But a “drill” is only one type of drill, of which there are many.
Types of drills for rotary hammers
So, the “edge” of the hammer drill, its working tool, which is called a drill. What types of drills are there for a hammer drill:
- Drill;
- Chisel;
- Pike (sometimes called chisel-pike too);
- Channel drill - cutting channels for wiring along the wall, and not deep into it (sometimes called a channel chisel).
- Crown
A drill in the form of a conventional twist drill is designed for making holes of a strict cylindrical shape. Usually under a dowel or dowel-nail. In the store they often call it a “drill for a hammer drill.”
Using a chisel, they remove, “combing out” layers of old plaster, tiles, tiles or any other material that is no longer needed. They are convenient for dismantling - it is easy to pry off the material to be removed.
The lance is intended for dismantling. They use it to punch holes in concrete or other surfaces. The lance is larger in diameter than the “drill” and has greater “breaking power”. That is, it makes holes larger than those that can be made with a drill, it is more powerful.
A channel drill, a channel chisel, is needed for making grooves along the walls for laying wiring or carrying out other interior elements, some guides for a plasterboard structure, for example.
Crown - for holes for sockets and switches. Its drilling area makes just the right hole with the right diameter and does it quickly.
Shank. What is it and how does it happen?
The shank is the back part of the drill that is clamped into the chuck.
SDSplus is the most common type, for low and medium power hammer drills, the diameter of the end part is 10 mm, the chuck is recessed by 4 cm.
SDSmax – 18 mm tail diameter, this is a format for professional-level devices, that is, for heavy and particularly powerful tools. Not only is it larger in diameter, 18 instead of 10, but it is also inserted into the cartridge to a greater depth - 9 cm.
Simply SDS – compatible with SDSplus. The first standard from Bosch is not very common now. Shank diameter 10 mm.
SDStop – between top and max formats – 14 mm in diameter, used only in some Bosch models.
SDSquick - hex shank for Bosch Uneo series of all varieties (Uneo and UneoMax).
A cartridge of the same type requires drills of the same type. The drill with an SDSmax shank is designed for a chuck in the SDSmax format. Then the shank is securely fixed and fits tightly. During work, he performs his function, does not walk back and forth.
The cartridge format is written either on the cartridge itself, or you need to find it in the instructions.
Adapters
There are adapters from one type of “tail” to another. If you have a powerful hammer drill and need to switch to a regular drill, then yes, you can do it. But if it’s the other way around – from smaller to larger, then it’s not worth it.
It is better then to choose a hammer drill that has a normal drilling mode. Because adapters are still inconvenient and cost extra money, and the reliability of such an articulated structure naturally decreases.
Types of “ornament” of the working part
- Auger drill - a worm spiral in a circle along the entire body of the drill bit;
- With a large angle of inclination of the working groove;
- With a slight angle;
- With single spiral grooves;
- With double.
The drills themselves are made of specially hardened steel, not an alloy. However, there are also carbide ones. But it will cost 10 times more. Therefore, an ordinary one made of hardened steel, but with a carbide tip or nozzle, is enough.
Types of drill bits
- With a regular straight cut tip;
- Centering with sharp polyhedral edges;
- Brazed carbide cutters;
- Replaceable nozzles.
The centering tips do not jump to the side during operation, and the hole in the wall, thanks to the special geometric shape of the drill bit with burrs and recesses, is better suited for the dowel - it holds more firmly, since the friction force from a rougher surface is higher.
According to the type of material, the tips come in different alloys - there is pobedit, 90% tungsten, 10% molybdenum, they are made from a new alloy, used in drilling rocks and processing marble. There are 92% tungsten and 8% molybdenum, alloyed in a special way. It is much stronger than Victory, called VK8.
There are replaceable drill bits, and there are soldered ones. The life of the drill depends on the quality of soldering - because essentially only the tip drills.
Dimensions of the drill bit for the hammer drill
- The diameter of hammer drills varies in the range: from 4 mm to 5 cm;
- Length of drill bits for hammer drills: from 5 cm to 1 meter.
How to choose a drill bit for a hammer drill?
Now let's move on to the second, but no less important question, and consider how to choose a drill for a hammer drill.
This means that if you need to drill “holes” in brick structures, partitions, concrete structures, walls, stone, and you need a lot of them, but they are small, then classic drills with a small angle are intended for such long-term, but not particularly intensive work, under which a spiral groove is made. The diameter and length of the drill are selected based on individual needs.
If the stone is hard, not shell rock, for example, but marble or granite, then the higher the hardness of such material, the harder the drill should be. In this case, they choose “armored” drill bits, and the better choice is the modern VK8 alloy - it has a higher tungsten content and a different technology.
There are soldered parts, and there are replaceable ones. Replaceable ones are better, but they are a little more expensive. Also in this case, for hard stones, it would be better not to have a straight head, a flat end of the drill, but a pointed one - it passes through such hard products better and lasts longer.
There are drills made entirely of carbide material. They are much more expensive. For household needs, a regular drill is suitable - they are all made of durable hardened steel, but the cutting part consists of a metal or alloy of special strength.
Concrete can also be very hard. The soldering must be Victory or VK8.
Not to be confused - VK8 is also called “Pobedit”, but it is a modern material that has better properties. It is used in drilling marble and rocks for drilling rigs. What's it like to drill into a rock?
Drills with a large inclination angle of the working groove are needed for high-speed drilling, which means you can work with them much faster. But such drills are less hardy. Therefore, their area of application is deep holes when only a few are needed.
Auger drills are an option that combines high drilling efficiency with long drill life and endurance. The auger and worm helix very effectively removes drilling products - crumbs of material, providing stability to the drill and reducing the load on it. A very effective thing. With an attachment it is better for harder surfaces.
There are multi-channel spirals, as well as grooves of specially designed shapes - their task is the same as that of auger ones - to reduce the load on the hammer drill, quickly removing dust from the recess hole that the drill makes. Their effectiveness needs to be tested in practice. Screws have already proven themselves. Other companies produce their own versions. But this is, of course, more effective than single-flute drills.
How effective they are than screw ones depends on the material and the specific pattern of a particular company.
Which drills are better for a hammer drill: only original drills!
The correct choice of a drill for a hammer drill is largely determined by the manufacturing company. There are many high-quality goods in China - but now there are simply a lot of counterfeits of famous companies. This is a high-tech production, a branch of mechanical engineering.
But original spare parts for hammer drills are most often produced under different brands at the same factories. Whether Hitachi, AEG or some other brand, it is known that they will be produced at the same plant in Germany, and will cost different money depending on the brand.
If you buy an original consumable, choose by technical characteristics, not by name.
Price: this is metal, hardened alloy steel, soldering and nozzles made of carbide materials - tungsten, molybdenum. They are not cheap. The markup in the store goes up to two times.
A cheap quality drill may be suitable for a one-time use, but you can also buy a “professional” series - professional ones.
Useful video
The video gives specific recommendations on choosing the right drill. A professional builder speaks
The best drills for a hammer drill, according to reviews on the forum, are produced by the following manufacturers: DreBo with a shaped sharpening of the tip-cutting part and multi-channel spirals on the body, Austrian Alpen, the original HAWERA - they say one of the best in terms of price-quality ratio, AMV has a little worse, but normal, Diager, Bosch German and Chinese, German is better and the DeWalt company, of course - read “Dewalt”, a monster in the hammer drill industry and professional tools in general. Not German, American.
vinstrumentah.ru
Types of concrete drills for rotary hammers
They differ in some important parameters, which are discussed in detail below.
Shank size
There are 5 types:
- SDS - shank with a diameter of up to 10 mm with two grooves.
- SDS plus is the most common size used in household hammer drills. It is characterized by a diameter of no more than 25 mm. There are four grooves for fixing it.
- SDS-max - shank with a diameter of up to 80 mm, used in industrial units. For fixation, it uses three open and two closed grooves.
- SDS-top is an intermediate shank size with a diameter of 16-25 mm, used in some BOSCH power tools. It has 4 grooves for good fixation.
- SDS-quick is a hex shank with a diameter of 4-10 mm, designed for Bosch Uneo/Uneo Maxx rotary hammers. It uses dowels for fixation.
Diameter and length
These are the most important dimensions of the drill, so you should definitely pay attention to them during selection and purchase.
- Diameter. Depends on the length and type of shank - for example, the maximum permissible hole Ø SDS max is no more than 50 mm. It is expressed as an even number.
- Length. The maximum drill length for a rotary hammer is 1000 mm, and the minimum is 100 mm. In production, the most popular drills are Ø 18, 20, 22, 24, 28 and 32. The drilling procedure does not allow the use of longer holes - it is impossible to drill holes with them.
The length of the drill depends on its diameter. These characteristics must be balanced so that deep holes can be drilled efficiently and safely.
The article contains tables showing the length and diameter of drills produced today.
Size Chart SDS Max
It should be noted that the longest drill for rotary hammers in accordance with the latest table is 1320 mm.
Resource (durability)
Experienced installers drill a large number of holes in various structures every day, so the working surface of the hole quickly wears out and its productivity is lost. The durability of a concrete drill for a hammer drill mainly depends on the metal used in its production.
In particular, much depends on the quality of the soldered crown, which is responsible for the main function of the drill (destruction of solid material). If necessary, you can use a drill to drill holes in wood products.
Attention! When choosing a drill hole, you need to take into account its main performance characteristics so that you do not have to subsequently purchase a new one and spend additional money.
How to drill concrete
To choose what to drill into a concrete wall, you need to follow the rules:
- Choose a tool with the ability to change the speed of the process, thanks to this the drill will work carefully without damaging the surface.
- Pay attention to whether the tool has impact drilling and depth adjustment; this gives good results when working with problem areas and helps soften them.
- Choose a drill that you can hold with both hands.
- Pay attention to the power of the tool.
Drilling with a hammer drill
The hammer drill is the most powerful tool, suitable for large volumes of work and for drilling concrete walls.
There are 2 ways this tool works: rotation and impact. For rotation, a special type of drill bit for a concrete hammer drill is used - a drill, it comes with a Pobedit drill bit. You can tell what a concrete drill looks like by its special shank, to which a special chuck is installed.
Such drills mean:
- SDS plus - has a thin shank and recesses to hold the hammer drill in your hand, the profile is symmetrical, it is easy to install this type of drill;
- SDS max - has a thick and long shank; correct installation is possible only in one position.
The pobedit tip is resistant to heavy loads. When the hole is located on the edge of the structure, drilling concrete using the impact method is not recommended, because A concrete structure may chip, and when working with ceramic tiles, the material will simply crack.
In this case, it is better to use a diamond concrete drill for a hammer drill; it has greater hardness than a Pobedit drill; you must take breaks during work to cool it; drilling at high speeds is prohibited.
Do not use hammer drilling with a diamond drill, as... Although it has great hardness, it is highly brittle and can crack.
Drilling
For small-scale work, especially in an apartment with thin walls, you can make a hole with a drill designed for drills for working with concrete. It can be either a win or a diamond product. A drill with a cylindrical shank is used for impact drills. When working, it is recommended to choose medium speed. Which drill bits for concrete are best to choose depends on the type of drill.
The best drill bits for a concrete hammer drill: rating
Listed below are the most popular drill bits for household and industrial hammer drills today. Thanks to this rating, you can choose effective and durable blast holes for them.
DeWALT EXTREME 2 DT7935B-QZ
Set of 10 drills (USA) in a convenient case with a latch. The drills have an SDS-plus shank, a diameter of 5-12 mm and a length of 110-160 mm. They are designed to work with stone, concrete and brick. Capable of working flawlessly for a long time with proper care.
Intended for household use. It is worth noting that this set is inexpensive.
Set DeWALT EXTREME 2 DT7935B-QZ
BOSCH 3.5×50/110 mm
The drills are distinguished by high quality workmanship and durability. This drill with an SDS+ shank allows you to quickly carry out construction and repair work in a house or apartment.
The cutting segments of the drill bit are made of high quality, so it allows you to make holes in stone, brick and concrete without any problems.
BOSCH 3.5×50 – 110 mm
Granite 425100 25/1000 mm
Has an SDS-plus shank. It uses four cutting segments and a double spiral for high-quality dust removal. It is made of high-alloy steel, and is subjected to hardening. Thanks to this, the service life of the product is significantly increased.
For reference! Due to high demand, it is difficult to find on the domestic market.
Granite 425100 25/1000 mm
Makita D-00050 /100 mm
This drill is designed for household power tools with SDS-plus chucks. It uses two carbide cutting edges, so the process of drilling the material is more uniform and faster.
The drill tip is well centered, due to this, drilling takes place exactly in the given direction. Thanks to the use of this tool, vibration is practically not felt during drilling.
Makita D-00050 −100 mm
Granite Quadro-X 845570 45/570 mm
Designed for industrial hammer drills with SDS-max chucks. Its cutting bit consists of four cutting parts made of high-alloy metal. Thanks to this, the drill has increased wear resistance.
It has a double spiral, due to which the destroyed material is quickly discharged out.
Granite Quadro-X0 mm
Thanks to this rating, the reader will no longer have the question of which drill bits are best for rotary hammers today.
With the help of this article, you can quickly select the optimal drill for a household and industrial hammer drill, and then at any time make the required number of holes in walls, floor slabs and other structural elements of buildings and structures. The most important thing in the drilling process is to adhere to drilling technology and safety precautions so as not to get injured or break the tool used in the work.
What does the color of a drill mean? Do you need to choose drills by color?
The production of cutting tools is regulated by numerous GOSTs, which establish requirements for the quality and technical characteristics of these types of products, including drills. Their main properties are reflected in the product labeling and serve for its classification.
These characteristics include:
exact designation (name) of the drill according to the relevant GOST; diameter; steel grade of the working part of the tool; accuracy class.
the color of the drill for metal and other materials is not standardized in any way,
since the color of the metal itself practically does not carry any information load.
by the appearance of the cutting tool, at best, one can name only a group of alloys
, to which the metal used to make the drill belongs. but this is clearly not enough to choose the right tool for yourself.
cutting tools: types, steel color grades
The metallurgical industry produces a huge range of products, part of which are alloys for the manufacture of cutting tools.
lists of relevant steel grades are given in GOSTs, according to which drills, cutters and other cutting tools for processing metal, wood and other difficult-to-cut materials are manufactured. The following types of materials are used for this:
- carbon tool steel;
- alloyed tool steel;
- high-speed;
- carbide steel grades.
The listed types are distinguished by high levels of hardness, strength, resistance to heat, corrosion and other adverse effects.
characteristics and properties depend on their chemical composition, which, in turn, determines the scope of application of products made from them, as well as its color.
A huge range of drills guarantees the consumer the optimal choice of this type of cutting tools.
steel color
Internet users often ask what color metal drills are. To begin with, we will introduce the natural colors of steel. there are not many of them. color palette includes:
- gray color and its shades - it is inherent in grades of carbon structural steel; these types are not used in the production of cutting tools;
- black and shades of anthracite color are a distinctive feature of carbon tool steel; they are also characteristic of some brands of high-speed cutters;
- the color of stainless steel in different shades is characteristic of alloyed metals, in the chemical composition of which chromium and/or nickel additives predominate or constitute a significant part.
in other words, the color of the steel can presumably determine the type of material, but not its brand. We remind you that it is the steel grade that indicates the properties of the metal and its scope of application.
black drill bits
Carbon tool steel is the most widespread and widespread material for the production of a wide range of tools and has a black color.
Hammers, pliers, chisels, files, axes, saws, chisels, and many other types of products are made from it.
There are 16 grades of carbon tool steel, 10 of which are used, among other things, for the manufacture of cutting tools.
Black drill bits made of carbon tool steel are designed for processing wood and other materials with similar properties.
This limitation is due to the fact that these alloys cannot withstand heating above 200 °C, as a result of which they quickly lose their properties and become unsuitable for their intended use.
At the same time, products of this color have high strength and hardness, which allows them to hold an edge well. In addition, black carbon drill bits are relatively cheap.
It's a completely different matter
‒ black and anthracite-colored drills made of high-speed and hard alloys.
They are designed for processing metals, stone, concrete and other high-strength materials.
They retain their properties when heated to 500 – 600 °C, which allows them to be used in intensive operating conditions.
The designation of high-speed steel grades begins with the letter P - according to the domestic classification and HSS - according to the international classification.
Hard steels are superior to any other grades of steel in terms of strength and other characteristics. For example, they retain their properties when heated to 1,000 °C.
To alloy high-speed and hard alloys, expensive additives are used: tungsten, cobalt, vanadium, titanium, molybdenum and other alloys. Their composition and content are reflected in the labeling; they cannot be accurately determined by color.
In turn, indicating the alloy grade on drills and other cutting tools is a mandatory requirement for their marking.
Stainless steel color drills
Some high-speed and hard alloys, as well as all alloyed tool alloys, can have the color of stainless steel. Drills of this shade are mainly intended for manipulating metal and other difficult-to-cut materials. Alloyed tool alloys can withstand heating up to +400 °C. In this they are inferior to high-speed and hard grades of black steel.
To improve the technical characteristics of cutting tools made from alloyed tool alloys, finished products undergo additional processing. For example, yellow drills are coated with titanium nitride, which increases their resistance to wear. The intensity of the shades of yellow, or rather golden, color indicates the thickness of such a coating.
However, the basic properties of tool alloys (hardness, strength, resistance to heat, etc.) are determined by their chemical composition, and not by color. It is enough for the consumer to be sure that the drills purchased are manufactured in accordance with GOST. If you wish, you can find out the detailed characteristics of cutting tools by referring to the regulatory document indicated in their marking.
Basic requirements for the material of cutting tools
Since color is not a very reliable criterion for choosing drills
and other cutting tools, let us recall their main characteristics and requirements for the metal from which they are made. The main requirements for tool alloys for drills are:
- minimum hardness (HRC) - its value is 53-57 units for wood tools and 62-64 units for metal and other difficult-to-cut materials;
- red fastness, or resistance to heat, without noticeable deterioration in properties;
- resistance to destruction.
The characteristics of the alloys are confirmed by test reports of finished products, which are attached to the certificates of compliance with GOST requirements. The buyer himself will not be able to check the quality of cutting tools, so when choosing them he will have to trust the business reputation of the supplier or seller.
The purpose of the drill can be checked by the angle of the factory sharpening of the tool. For example, wood drill bits should be sharpened at an angle of 85 +/- 3 degrees. For metal drills it is 118 +/- 2 degrees. The sharpening angle of the working edges can be easily checked using a template.
Tools made from high-speed, hard and alloy alloys can be sharpened for drilling any types of materials. Black drills made of carbon tool steel do not allow such liberties. They are suitable for drilling wood, hard rubber, plastics and some types of light alloys.
By the way, are there anyone willing to argue about the correctness of my reasoning on the topic of sharpening?
Then I invite you to the next article
