Types and selection of chisels for a hammer drill

Independent repair and creation of a new interior is not only a long process that requires significant financial investments, but also a very difficult type of work, especially at the construction stage. For a quick and high-quality performance of work, you need to purchase special tools. One of these helpers is an electric hammer drill, with which you can make grooves for wiring, remove old concrete cover and punch all necessary recesses. For each type of work, it is necessary to use special attachments, a huge assortment of which is presented today in hardware stores.

Chisel is an impact-cutting type of tool that is used for processing products made of stone or metal, consisting of a cutting working part and a butt pad. The butt pad is used to strike and the edge is used to cut and split various materials.

Novice craftsmen may confuse chisels for electric tools and for carpentry. The chisel has an external resemblance to a simple drill (chisel). The main feature of a hammer drill chisel is the presence of a special recess that corresponds to the connector on the tool. To work with metal, a chisel is used, which has a rectangular section with four cutting surfaces.

In specialized stores, you can purchase several types of this tool for concrete, which have a different appearance.

• Flat chisel. The most popular shape, which resembles a sharp-tipped screwdriver, is versatile and is the basic shape for creating other types of chisels. The standard cut size ranges from 0.1 cm to 0.4 cm.
• Pica - impact nozzle, which has a conical or pointed shape and is used to form holes in brick or concrete products. The resulting depressions are irregular in shape with uneven edges.
• Scapula - a flat chisel that has a wide and thin edge surface and is used to remove tiles or old plaster. The curved shape of the nozzle speeds up the work process and improves material prying. There are attachments in the form of an ordinary garden shovel.
• Special chisel - a scapula that has a round and curved shape, as well as wings along the entire length of the working surface. This form is an improved chasing cutter, which is used for chasing electrical channels. Special fenders not only facilitate the chiselling process, but also regulate the depth of the channel.

The chisel type depends on the weight of the hammer drill:

• up to 5 kg - products of the SDS type are used;
• up to 12 kg - install SDS-max models;
• more than 12 kg - use hexagonal fasteners of the HEX brand.

The most common material for making chisels is forged steel, which has a high level of strength and a long service life. In specialized workshops of industrial enterprises, products are hardened at temperatures from 800 to 8000 degrees. The heating process should be carried out evenly over the entire working surface, and placing the nozzle in the oven improves the quality of this procedure.

After heating the metal, it must be placed in cold water or oil. In the process of immersing the tool, the liquid begins to evaporate quickly, and a large amount of steam is released, which ensures gradual cooling of the steel. It is necessary to immerse the chisel strictly perpendicular to the water surface with the sharp side down. Rotate the tool slowly while cooling.

This technology is designed to harden a sharp working surface without affecting the dynamic center.

On the shelves of specialized stores, you can see a wide range of products of this group from different manufacturers, which will cause difficulties when choosing from novice craftsmen. The process of choosing and buying a chisel must be approached carefully and very responsibly. The choice of the nozzle depends not only on the type of planned work, but also on the brand of the perforator.

The main parameters that affect the choice of the working nozzle:

• puncher type;
• purpose of use;
• tail section view;
• dimensions of the working surface;
• diameter;
• material;
• the weight;
• structure structure.

The most popular and widespread type of drill is SDS-plus, the shank of which has a size of 0.1 cm. There are models for which it is necessary to purchase an SDS-max drill with a shank diameter of 1.8 cm. In many models of rock drills, manufacturers have provided the opportunity to use special adapters that allow using and conventional drills.

Auger chisels with different slopes of the grooves are the most demanded type of chisels, which are used for performing a large amount of work. Experts recommend paying attention to the nozzles with a double system of recesses.

Chisels for concrete have a wide range of lengths (from 5 cm to 100 cm) and diameters from 0.4 cm to 0.25 cm. Quality drills should have a self-sharpening working surface and have no protrusions. For a snug fit of the dowel, it is necessary to give preference to a chisel with a centering spike.

The choice of the nozzle depending on the type of work:

• peak - removal of the old coating, chipping of channels for wiring and communications, the formation of recesses in the concrete surface;
• channel chisel - formation of even channels;
• crown - hollowing out holes for sockets and electrical switches.

To perform a large amount of work over a long period of time, it is necessary to purchase not only high-quality chisels, but also a good perforator. When choosing an electric tool, you must carefully study the reviews of manufacturers and various models. Experienced consultants of specialized construction departments will definitely help you to purchase the necessary tools at an affordable price. Cheap products will only help to carry out a small amount of work and will quickly fail. This group of products is not suitable for professional builders and specialists who carry out work to order.

For safe work, experts recommend adhering to the rules for the operation of electrical devices. Installation of the tip into the punch cartridge takes place in several stages:

• pulling the base of the cartridge down;
• installing the chisel shank into the connector;
• checking the reliability of the tip fixation.

Once the chisel is inserted into the hole, the mechanism will automatically rotate the chuck into the correct position and secure the tip firmly. This procedure will not cause difficulties even for inexperienced specialists. The maximum length of the possible chisel exit from the socket should not exceed 10 mm. The chuck must be smoothly rotated parallel to the axis to securely hold the bit.

To remove the nozzle, you must perform the following list of actions:

• complete stop of all moving elements;
• maximum pulling the cartridge down;
• removal of the tip from detachable elements;
• return of the cartridge to its original position.

In the process of performing work, the working tip is heated. To prevent burns, all work must be carried out in protective gloves.

Chisel sharpening is the main factor that affects the quality and speed of work. Novice craftsmen often do not know at what angle the tool should be sharpened. The sharpening angle is influenced by the purpose of the drill. The angle of sharpness for various surfaces (in degrees) is:

• fragile - 75;
• medium - 65;
• soft - 45-35.

High-quality chisels with a self-sharpening function do not require additional sharpening of the working surface during the entire operation. Tools that are properly sharpened at the right angle are capable of working effectively on any surface.

The sharpening process is carried out by masters on special equipment. The main condition for maintaining the strength of the metal is to keep the temperature at 1100 degrees. The removal of a small metal layer is carried out evenly from the entire working surface. The final stage is chamfering and forming a cone.

The hammer drill is an advanced drill that has the function of not only drilling, but also chiselling various types of surfaces. In order to make this tool versatile and capable of performing a huge amount of construction work, modern manufacturers have developed several types of nozzles - a drill, drill bit, chisel, lance and blade. To perform minor home repairs, various chisels are in special demand, which not only speed up the repair process, but also make it possible to complete the most complex tasks.

For information on how to choose chisels for a hammer drill, see the next video.