"Win" or not "Win"
The Pobedit alloy, invented in the first quarter of the last century, consisted of 96% tungsten carbide and 4% cobalt. In the modern classification according to GOST-y, such a material corresponds to the alloy under the VK4 index. The number in the carbide grade indicates the percentage of cobalt. Nowadays, most manufacturers use VK8 alloy (92% tungsten carbide and 8% cobalt) for carbide drill bits. Special additives are added to the alloy to improve cutting performance and extend the life of carbide-tipped products. However, according to the ingrained habit among the people, the drill for working on concrete, brick, stone, glass or tile has remained “victorious”.
Drill color
The first criterion by which you can independently determine the quality of the tool offered to you is its appearance, in particular, color. Experts note the following features:
- Gray. If the metal looks exactly in this shade, then you are offered the most unreliable option - these drills have not undergone any processing to strengthen and increase resistance to deformation and combustion. Yes, the price of such a drill for metal will be very low, but it's good if you have enough of it to complete one task.
- Black. If the drill is black, this indicates that it was treated with superheated steam. The result of such a procedure is an increase in strength characteristics and, as a consequence, an extension of the service life. The price of such products is somewhat more expensive than gray color instruments, but it is quite affordable.
- Pale golden hue. This color is acquired by drills for metal after tempering has been used in the manufacturing process. The main purpose of this treatment is to relieve internal stress in the hardened metal and increase its strength.
- Bright golden color. These drills will cost you significantly more, but the alloy will contain the most durable titanium for today. Thanks to this, the friction of the drill during operation is reduced, due to which it is much more convenient to make holes, and its service life is extended.
How to use a hammer drill with attachments correctly
Before using the rotary hammer, make sure that there is no damage. If necessary, the instrument must be pre-cleaned. Before inserting the drill into the hammer drill, it must be lubricated. Otherwise, the rubbing part of the working attachment may be damaged when the power tool is heated.
For professional use, it is better to choose drills with a higher price.
Then the drill with some effort is fixed in the chuck for the hammer drill with the shank. A clicking sound indicates correct installation of the accessory. However, for control, you should try to pull the drill back, which should not be carried out. If there is play, the cartridge must be replaced.
During the drilling process, the drill should be removed from the hole every 10-15 seconds. To replace the drill or at the end of the work, you must press the special ring of the chuck along the axis in the direction of the power tool, after which you can remove the consumable.
It may happen that the drill cannot be removed from the chuck. This indicates the deformation of the shank, which occurred during the execution of the work. A similar situation may arise when using a product made of poor quality material.This phenomenon can also be observed as a result of excessive stress on the tool during the drilling operation.
The type of drill should be selected based on the properties of the treated surface.
To extract the drill, you can use a vise, where it is clamped. The hammer drill is pulled out in an unwinding motion (from side to side). In this case, the cartridge must be in the open position. A stuck drill can be wrung out with a gas wrench, which will act as a lever.
During the operation of the hammer drill, the drill may fly out of the chuck. This is possible as a result of prolonged manipulation of the tool at an angle, a defect in the consumable part, or wear of the locking mechanism.
Species overview
All available drilling devices, which can be used to drill holes in reinforced concrete in a monolithic surface, are classified into 2 types.
For drill
This product differs from analogs in that it has a cylindrical shank, sometimes this shank can also be made with a hexagonal shank. Such a carbide drill can be used not only for a drill, but also for a screwdriver.
For hammer drill
The shank structure of this type of tool looks like a cylinder. To distinguish them from analogs, these drills are specially marked in the form of the letters SDS Plus or SDS Max.
Drills for concrete are divided into impact and non-impact drills. The difference between them is that the shockless version of the tool has a sharp cutting edge that cuts the material, and the hammer drill has a special carbide plate on 2 sides of the working part that breaks concrete. The impact option is also called a drill bit for concrete.
Impact drills are of 3 types.
- Auger drill is a long professional drill for making deep holes. This device has special grooves, with the help of which the waste concrete material is removed.
- Shallow drill - with its help you can drill a hole that has a small length and diameter. Working with such a device requires significant physical effort.
- Twist drill - the drill has a large diameter and an elongated working part.
Some versions of concrete drilling tools have a special cutting bit. Such a device is used for drilling holes for sockets or socket outlets, a switch, as well as in all situations when you need to make a round hole with a large diameter. Core drill is also divided into diamond and victorious. In the case of a victorious drill, instead of diamond spraying, small teeth with a victorious weld are located at the edges of the working bit.
There are also special forms of drills designed for perforating aerated concrete. Outwardly, in terms of its structure, this product does not look like either a diamond or a victorious one. The device for aerated concrete has the form of a hexagon, and at the end it has a special design that allows you to carefully remove aerated concrete layer by layer, creating a hole of the required diameter in it.
Choosing a Winning Drill
The shops now have a large selection of drills from Pobedit. You can always find something suitable for a specific case, given working conditions and material. They are sold individually or in sets.
Product prices can vary greatly. It depends:
- from the manufacturer, brand awareness;
- from the country of manufacture;
- from the seller.
As a rule, popular European brands are more expensive. They are usually worth it because they are distinguished by:
- good quality, including sharpening;
- mandatory guarantee;
- the tips are difficult to distinguish from the general background, since the soldering is very neat.
There are mid-range products. The cheapest products belong to unknown companies. Common disadvantages include:
- strength - low;
- do not always correspond to the declared characteristics.
Drills from Bosch
Bosch products are well known to everyone. The company also produces drills with victorious tips.Their diameter is from 3 to 25 mm.
Products of the Blue Granite series are designed for stone processing. They are distinguished by:
- reliability;
- quality;
- they drill better in concrete than conventional victorious ones;
- u-groove, good waste removal;
- used with impact drills.
And you can also highlight:
- Silver Percussion - also for stone and concrete of special strength.
- Impact - for processing natural and artificial stone.
- Karat - designed for drilling any surface, except for concrete and artificial stone. The cutting part is specially sharpened and sharper, so the edges of the holes in various materials are smooth.
- Black Quartz - for roof tiles and tiles. They can withstand heavy loads.
Drills DeWalt
Among the manufacturers, the DeWalt company stands out. The products of the Extreme SDS-Plus series are especially well known. Its features include:
- diameters - from 4 to 16 mm;
- shank - round or hex;
- the cutting part is serrated, it even takes concrete with reinforcement;
- the groove is in the form of a jug, it removes debris well;
- the tip is attached to the drill using a special technology, a special solder with copper is used;
- due to the design, such products withstand overheating better;
- the holes are very even.
When choosing winning drills from any manufacturer, it is better to give preference to those of them that are designed for a specific material. If the tool is used infrequently, you can get by with products of a "wide range"
In any case, it is important to feel the peculiarities of each type in work and practice
Benefits of Winning Drills
- The alloy has high strength. This means that it is very difficult to deform it with ordinary abrasive materials, and since concrete contains particles of abrasive, the drill is not blunt with it.
- If steel is a more viscous material and is removed in layers, then building materials are brittle and crumble. The drill is just designed for crumbling concrete, not cutting.
- Pobedit withstands shock loading well, at which there is no deformation of its cutting edges. This is important because all rotary hammers work on the percussion principle. Steel drills are deformed after impact and are not able to work effectively.
- Some alloys can freely cut through steel - they are indispensable when drilling reinforced concrete with a reinforcement frame.
- The technology for producing modern victorious alloys is characterized by low cost.