How to choose drills for a hammer drill. Crowns, chisels and other attachments

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 hole: features

Drills are used exclusively for working with a hammer drill. They are not used for drills. There are a number of different types of drill bits available, depending on the material you plan to work with. Metal, masonry and wood can be drilled using specially designed structures. They are adapted to the properties of a specific material and will help achieve the desired result with minimal effort and time. The range of drills also includes special products, for example for creating holes in glass surfaces or tiles. For these purposes, manufacturers produce drills with diamond tips made of tungsten carbide.

The quality of drills is determined by the material from which they are made. Accordingly, the type of material that they can drill is determined. Most often, drills are made from materials such as high-speed steel, with the addition of carbide, titanium, cobalt and other substances that improve the properties of the material.

Drills differ in the type of shank. Thus, straight shanks are used for chucks with and without a key for holes with a diameter of 10-13 mm. SDS shanks are used for corresponding rotary hammers. Hex shanks are used for screwdrivers.

Drills for stone and metal can be spiral-shaped, drills for wood can be twisted or flat. Drills come in different diameters and lengths. Extensions can be used if necessary.

PROJAHN 8303110 Drill SDS PLUS – the best in its segment

Designed to create holes in concrete, including reinforced concrete. Equipped with a fixation system in the SDS+ rotary hammer for quick change of equipment. Penetration into a durable concrete layer is facilitated by a composite carbide tip. Accurate soldering centering will ensure that the hole is made with the required tolerances for deviation from the specified dimensions.

Pros:

• Strength.
• Plunge speed.

Minuses:

• Overcharge.

How to choose metal drills?

To start working with a drill, you need to determine the characteristics of the metal that you will drill. All metals have different levels of density. The density of the metal determines the design of the drill, as it must be harder than the metal into which it is pointed.

Manufacturers take this rule into account, so they are made from different materials containing different elements to increase hardness and improve cutting ability. Conventionally, there are two groups of metal drill materials:

• made of high-speed or alloy steel: it is an alloy consisting of a metal element combined with a chemical element that gives the steel certain properties;
• made of hard metal or carbide. powdered forms of tungsten carbide are heat treated with binder metals such as titanium or cobalt to produce a solid.

Popular types of metal drills

Drills are classified by type, cutting method, and connecting element. The following types of drill according to the material used are available on the market:

• made of high-speed steel. The most popular steel, characterized by high hardness, strength and sharpening ability;
• from colbate. provides strength and resistance, increases the hardness of the drill. Cobalt retains its properties better at higher temperatures than titanium, so a higher operating speed of the hammer drill is acceptable;

• titanium. Titanium coated drill bits provide a stronger and more stable alloy. When choosing titanium drills, pay attention to the percentage of the auxiliary component;
• Wolfram carbide. This component gives drills an increased level of strength and hardness. The combination of tungsten and carbon produces a harder or softer metal depending on the percentage of carbon in it.

Drill bits should be used with cutting fluid at low speeds using even and constant pressure. Monitor the condition of the crown, which should always be sharpened. If the drill is used incorrectly, it will quickly become unusable.

With different ratios of components in the mixture, metals with different properties are formed. A low percentage of impurities will have little effect on the quality and durability of the drill. The quality of the drill is also influenced by its processing and production processes.

The drill hardness rating is determined using the Brinell scale. The indicators are determined in newtons per square millimeter. A higher indicator means a more stable and reliable drill.

Creating holes with drills in stone and concrete

When choosing a drill bit for a stone hammer drill, it is not so difficult. It is important to determine how soft or hard the material needs to be drilled. Most rock drill bits are made from tungsten carbide.

Tungsten carbide drills are effective on concrete, granite, silicate masonry and natural stone. The overall quality of concrete drills depends on the quality of their tip and the number of cutting edges - 2,3,4.

The most effective will be a drill with four cutting edges made of carbide. Less durable drills have no more than 2 edges. Reinforced concrete must be hammer drilled using a standard or impact drill.

For concrete work, drills with the following types of shanks are used:

• straight shank;
• Slotted Drive SDS: A drill with a knurled shank that snaps into the chuck. Used in most hammer drills;
• hexagonal. More suitable for screwdrivers. These drills are designed for use with impact-type screwdrivers

Most concrete drills have SDS+ shanks. SDS Max shanks are used for heavy duty applications.

To work with a stone drill, various product designs are used. They most often differ in the type of groove. There are: a double L-shaped groove - this is a universal option, a U-shaped one - for better chip removal, with four teeth - to increase the stability of the drill. Grooves differ in the number of edges.

What to pay attention to

There are hundreds of attachments in the store, and it can be difficult to determine exactly which one is suitable for a particular situation. Sometimes it takes several minutes to find a drill, especially if there is no consultant on the sales floor. To quickly identify a tool, just look at the shape of the edge that is fixed in the chuck.

The product has a cross-section with a complex configuration, so it can be with a small groove, convexity, SDS, etc. Unlike a drill, a drill has a standard round shape.

A complex cross-section is necessary for this tool, as it guarantees a tighter connection with the chuck of the electric tool. All attachments are classified into different categories to make it easier for a person to find a specific model. However, despite all this diversity, two types are considered popular:

Creating holes with a drill in wood

Most wood drill bits are made from hardened steel. There are several types of drills for wood processing:

• flat drills are used for drilling large diameters over 13 mm;
• spiral drills are supplied with a diameter of up to 17 mm, although there are exceptions;
• auger drills designed to remove chips when drilling wide holes;
• Triangular drills are suitable for drilling small holes.

Spiral drills are more suitable for working with denser materials, flat drills for smaller ones. Drills have different types of shanks. The straight shank is considered the most versatile.

Types of nozzles and drills - which manufacturers are better

It is recommended to give preference to branded working equipment from Bosch, Metabo, Makita. Replacement parts from these manufacturers not only last a long time, but are also less likely to damage tools and surfaces.

Types of tips (carbide cutting inserts) of drills

Let us examine in more detail the types of working removable elements of electric hammer drills.

Screw attachments

They are used when you need to create deep holes. The spiral design ensures efficient dust removal, which reduces work time.

Flat drills

They come in handy when you need to make a small hole. They are durable, but inconvenient for long-term use: due to poor debris removal, the user has to manually remove dust from the resulting hole.

Spiral drills

They are best suited if you need to drill through a thick wall: the design will ensure high-quality and timely removal of construction waste.

Drill bit

Crowns

Used in electrical installation work. Necessary when you need a hole for a socket or switches. There are crowns with diamond coating or pobedit teeth.

Other types of drills

There are varieties of attachments that are useful in certain specific situations:

• A drill with a high flute angle produces deep holes at high speeds that wear out quickly, putting a lot of stress on the power tool.
• A low flute angle bit will quickly drill a large number of small holes.

How else are there drills?

In addition to the most popular types of borom, there are other types. They will be useful for effectively solving specific problems. The list of universal drills for metal, concrete, and wood is supplemented by the following types:

• stepped drills – conical-shaped products with different diameters;
• short drills - for drilling very hard metals and spot welding;
• Forstner drills - for drilling large holes;
• sliding drills – suitable for creating holes in wooden structures. Available in diameter sizes from 13 to 45 mm;
• drills with countersinks - for creating new holes with a drill or working with thin materials, for example, chipboard;
• installation drills are long products designed to create holes for pulling wire.

Drilling recommendations

The drill should not be allowed to overheat; work should be interrupted every 16 seconds; the tool should cool naturally, without any liquid.

If stones hit during operation, it is difficult for this element to move further; the stone must be broken using a chipper, then work continues. When drilling a hole in a load-bearing wall or ceiling, it is recommended to use a hammer drill; with its help, the work can be completed as quickly and efficiently as possible.

It is also better to drill a reinforced concrete wall with a hammer drill. For a hole in ceramics on the wall, you cannot use the impact method or use a drill on concrete, otherwise the tile will collapse.

Cheap models can be sharpened from time to time using an angle grinder with a diamond blade mounted on it.

Drilling with a rotary hammer

A hammer drill is one of the most important power tools in the repair industry. Without it, it is difficult to imagine major repairs and solving everyday problems. When choosing a rotary hammer, it is important to pay attention to several factors that determine the quality and efficiency of its operation.

If you are looking for a rotary hammer, first, better determine its technical and mechanical features:

1. Hammer Size: Determines the size of drill bits you can use with this tool. The larger hammer drill is designed for industrial projects, while the smaller hammer hammer is typically used at home.
2. Motor Speed: The motor speed of a hammer drill determines the power of the motor. A faster spinning motor usually results in higher hammer drill performance. The description of the hammer drill should contain information about the number of revolutions per minute.
3. Motor power: It is imperative to check the motor power of the rotary hammer before purchasing. Like various other power tools, the motor power of a hammer drill is usually specified in amps. Universal size - 6 or 7 amperes.
4. Durability and build quality. The high-quality plastics and metals used to make the hammer drill allow it to last a little longer.
5. Type of food. Although all hammer drills are electric, they may use a different method of power delivery. Most popular impact drill options are corded hammer drills that charge by plugging into an outlet. Another method is battery power. This tool can be used regardless of the power source.

An advantage when choosing a hammer drill is the set of drills included. Different drills are suitable for specific conditions and applications. The hammer drill may also be sold with a carrying case. It will come in handy when using the tool.

Drill SDS plus-5X, 10x50x110 mm Bosch 2608833797 – a combination of quality and performance

The excellent quality of cutting tools equipped with carbide brazing will allow you to drill out concrete and brick walls and ceilings. Speed ​​of passage and accuracy are ensured by a tip with four-way directionality. Drilling dust is discharged along spiral grooves along the main axis of the drill.

Pros:

• Excellent quality from a German brand.
• High performance.

Review of the best drills for rotary hammers 2022

1. Bosch 2608833778. This product is suitable for working on hard surfaces. It is used for rotary hammers with an SDS-plus chuck. This model is equipped with a reinforced tip, which provides a centering position when drilling. The manufacturer wisely approached the shape of the head, making it asymmetrical. Due to this, less dust is generated during the drilling process.

During operation, the drill withstands any manipulation and is considered wear-resistant. The drill also contains four edges responsible for cutting the material. They are located in such a way that the drill will not jam in the hammer drill. High-strength carbide and tungsten are used to produce drills. This composition is responsible for wear resistance and impact resistance. The benefits of products from a well-known brand will be guaranteed for the entire operational life of the product. Such drills cost around 160 rubles, so the only downside is their price.

1. Makita D-00050 is compatible with SDS-plus type chucks. The average price on the market is around 80 rubles. The cost is quite justified. The design has two cutting edges. Due to this, the drills take a little longer to make a hole than the previous model. Despite this, the drill is quite functional, and the drilling itself proceeds without delay. The tip is weighted due to its pointed shape. Therefore, you can count on drilling in a given direction. No vibration will be felt while working with the drill. This version of the drill is suitable for working with materials of increased hardness, such as concrete, brick or stone.
2. DeWalt DT9571-QZ 14 costs around 600 rubles. The main feature of the drill is increased strength due to the reinforced core structure inside. There are several advantages of the drill:

• Excellent carbide alloy for long life and better strength;
• optimized groove design to eliminate debris and formed chips;
• hardened case for added strength and reduced risk of breakage;
• 160 degree tip design provides better penetration, increased drilling speed.

The drill is suitable for models with SDS-plus chucks. This is an example of a modern drill with excellent mechanical properties.

1. ZUBR 29380-340-12 is a product adapted for working with SDS-max rotary hammers. The domestically produced drill has a screw spiral. It provides increased space through which dust is removed. Durable steel is used to produce the drill. The tip has two cutting grooves. This is the standard option. The advantage of the drill will be the presence of a reinforced core. Minimal vibration during operation and extended service life attract buyers. When used in a hammer drill, jamming of the drill is excluded.
2. Granite 425100. Drills of this model are compatible with hammer drills with SDS-plus cartridges. The presence of four cutting edges made of carbide and tungsten provides increased wear resistance of the drill. The issue of dust formation and edge accumulation was resolved thanks to the double helix. It also guarantees increased operating speed of the tool. Alloy steel is used to produce drills. Granite drills are suitable for working with all types of concrete and brick. According to customer reviews, this model is not always found in stores. Overall, the drill is worth its price and is considered a popular model with a good service life.
3. DeWalt Extreme Kit. The drill bits in this case have No-Walk tips for clean, precise drilling. High quality work is achieved thanks to recessed cutting wings. They are suitable for drilling alloy and non-alloy steel, and can be used to create holes in wood and plastics, thin metals and sheet metals. The set includes 6 Extreme drills and 11 drill bits for screwdrivers and 2 holders for quick drill replacement. The cost of the case is 2300 rubles including a suitcase made of high-strength plastic.

Drill SDS plus-5X (5×50/110mm) Bosch 2608833771 – long life

The drill is used in conjunction with a hammer drill equipped with an SDS+ fixation system. The carbide tip contains a centering tip, which ensures reliable and accurate drilling in concrete. The four-sided tip geometry helps overcome dense environments. This form of composite brazing prevents jamming in the reinforcing steel.

Pros:

• Excellent drilling speed.
• Tool longevity.
• Workmanship.

Minuses:

• Not noted by buyers.

Drills for rotary hammers: what you need to know about their use

Despite manufacturers' claims about the durability of drills, they can fail. Most often, the period of use depends on the materials with which it comes into contact. The cause of a drill malfunction may also be considered to be improper use. Also, the owner of a hammer drill should not forget about the mandatory lubrication of tools.

The drill is practically not subject to restoration and repair. This is a consumable item, so it will be easier to buy a new drill. During the working process, the drill does not need to be removed from the hammer drill and cooled. There will be no overheating, and the drill itself heats up to a temperature that it can withstand.

Choose high-quality drills and use them for the specified purposes.

The best of the best

If we consider specific manufacturers, it is worth noting Bosch. This company produces the best tools chambered for SDS-max, of which it is the inventor. Among others, German DeWALT drills perform excellently, which are excellent for household and professional use.

If we consider drills for more specialized purposes, then Makita comes to mind. The flat drills from this company cannot be called the best, but the breaking ones show excellent performance even in harsh working conditions.

Among public sector employees, it is worth highlighting Elitech. The company makes excellent drills for home use. However, you should not rely on them when processing dense rocks.

Do not forget to lubricate the shank after purchasing the tool. It is advisable to use lubricant of the same brand as the drill. However, this is not critical.