Metal crown: types, sizes, methods of application

The metal crown has gradually taken its rightful place among household tools. The presence of this nozzle in many cases allows you to save money and time on labor costs and while waiting for an invited specialist. Making a technical hole for a lock in a metal door or drilling round "niches" when tuning your favorite car becomes quite a feasible task for everyone.

Ring crown for metal: technical features and method of application

Metal is a material that has recently expanded its scope of application. More recently, he was associated with frames, floors, rigid overall structures. Today, metal shelves, tables, decorative elements adorn the interiors of many houses.

Cutting a pipe, corner, sheet is easy with a saw blade for metal. To connect the blanks into a structure, most often it is necessary to make a hole, which is made in the metal with an annular cutter - a crown. The crown design consists of the following elements:

• metal glass;
• cutting edge;
• shank.

Cutting part has the form of teeth, which can be a continuation of the metal cylinder bodies or be soldered fragments.

The bit is attached to the power tool using a shank, which is either triangular or hexagonal (depending on the size of the diameter), which provides a strong torque connection.

Ring metal saws differ in two ways:

• to size;
• by the characteristics of the material from which they manufactured.

Range dimensional sizes of diameters are quite wide - from 14 to 152 mm. Concerning features of the material, you should know that models are produced from hardened and alloy steel, the latter being particularly durable.

Metal Carbide Bits: good quality and reasonable price

Despite the rather narrow scope of application of crowns, verified and clear their classification is almost impossible to find. When labeling products, manufacturers use their own definition of differences. And the names different can be used: "crown drill", "crown", "circular saw", "Ring cutter". And this is not the whole list.

The division into types based on the characteristics of the material of manufacture is even more confusing. The designation "20 mm alloy steel crown for metal" corresponds to the truth, but does not give any idea about the product at all. All metal crown bits are made of steel. Any steel has additives, that is, it is alloyed, supplemented with components that enhance or change its physical characteristics.

The most common formulation is HSS bit. Such steel belongs to high-alloyed types, it must include the following substances: tungsten - 19%, vanadium - 2.6%, molybdenum - up to 3%, chromium 3.5-4.4%. Such a combination of components makes the cutter durable, resistant to wear for a long time, red-resistant, that is, not subject to deformation at temperatures up to 600 ° C.

Carbide bits made of this material are widely used, their used both in everyday life and in large-scale construction.

The products are of good quality and reasonable prices. The average size option - a 50 mm metal crown - will cost (depending on the manufacturer) from 600 to 1000 rubles.

Bimetallic bits for metal: material features and method of application

Bimetallic - made of two types of metal. In the case of metal crowns, this is a compound of high speed steel and cobalt, the content of which must be at least 8%. This combination gives the material the qualities required to efficiently cut various types of metal, including stainless steel, aluminum, copper, brass, and more.

The diameter of these saw nozzles can be very different, but most often, medium and large tools (from 20 to 152 mm) are made in this way. Prices for these products vary depending on the size and manufacturer. A 20 mm nozzle will cost 150-250 rubles, a 35 mm metal crown - 350-500 rubles, large-sized 127 mm options - 900-1300 rubles.

To the main technical and operational characteristics of bimetallic bits should be carry:

• high quality material that allows you to drill metal of any hardness;
• the presence of side holes that provide waste disposal and cooling of the cutting edge;
• the shape and peculiarity of the location of the teeth, contributing to the execution of neat cuts, without burrs;
• minimal (almost imperceptible) vibration during work;
• the presence of a shank, which makes it possible to attach the nozzle to a power tool of various powers.

Useful advice! Bimetallic bits are more often used to make holes in hard and thick metal. When choosing a nozzle, be sure to pay attention to its compliance with the power tool that is planned use

Diamond core bit by metal for drilling in stone, concrete, ceramics

The first diamond bits had a steel body with surfaces with natural stones. It was very effective tool, but it cost a lot of money. Modern industry produces artificial diamonds, which are not inferior in performance characteristics natural, therefore they are actively used for drilling and cutting various materials.

Two types of diamonds are fixed on the edge, which has the shape of teeth: undercut and volumetric. The latter are directly cutting. Undercutters are located on the inner and upper parts of the end part, they serve to protect the teeth from wear and tear.

Diamond bits are quite expensive tools. For example, a 35 mm crown will cost 300 rubles. It is not worth working on metal with such a nozzle, it is intended for hard stone: concrete, granite, marble, etc. If there are metal inserts in concrete or ceramics, then this version of the hole saw will be a suitable tool. The crown will surely pass the crumbling layers and easily cut the metal elements encountered on the way, while maintaining the working surface.

Useful advice! The diamond coating on the bits can be different. Therefore, when choosing nozzles for drilling stone with metal inserts should be correctly evaluate the thickness of the latter and select an annular cutter with a suitable cutting butt

As necessary choose a drill for crowns by metal

A very important point to ensure the normal operation of the annular cutter, is the suitability of the accessory for the power tool used. Most often in Drills are used as a rotary device. They have different specifications. Here you need to pay attention to the following indicators:

1. The power of the drill directly depends on the diameter of the crown: the larger it is, the more powerful the power tool is needed. For example, a 600 W drill is suitable for a 25 mm metal crown.
2. The ability to adjust the speed. The drill will not only be used for drilling, so it is extremely important to set the desired spindle speed. Bits of small volume require a significant number of revolutions; for large dimensions of the diameter, the speed must be reduced.
3. Matching the shape of the bit shank to the type of the chuck. Chucks can be of two types: key and quick-clamping. For the first, a special key is required, with which you can fix the nozzle (this option is considered more reliable.) The second is much easier - you can fix the nozzle with one hand.

The 22 mm metal crown does not require changing the spindle speed during operation. It is quite possible to increase the load on the cutting edge due to the passage of a harder layer of material. To work in such conditions (drilling layers of different densities), a drill with the function of maintaining the frequency under load (constant electronics) can become a convenient option. The power tool will adjust the speed according to the specific conditions.

Financial benefit and expansion of possibilities: sets of crowns for metal

If the question arose of choosing a crown for making holes in the metal, it means that a lot in the house is done by hand. What should we focus on: purchase a nozzle for a specific single purpose or buy a set by looking into the future and warning of the need? In an uncharacteristic single case it is worth dwelling on a separate product. Moreover, it will be useful to weigh and calculate what quality is worth paying attention to.

Even for the non-professional looking to have a certain arsenal of home tools, it is better to prefer a set of metal crowns for a drill. The advantages of purchasing this kit:

• the ability to make holes of different diameters, changing only the annular cutting part;
• no need to waste time looking for cutters of different diameters;
• cost savings: a set of crowns is significantly cheaper than the separately purchased attachments;
• rigid plastic cases, in which the elements of the sets are laid, provide convenient and reliable storage of the tool.

If you try to evaluate the financial benefit from purchasing a set, then the calculation will be approximately as follows: the price of a 40 mm Enkor crown for metal is 270 rubles, a set of 5 similar cutters from this manufacturer costs 760 rubles. The price of one nozzle (on average) is almost two times less.

Sets of crowns for metal can consist of 5, 8, 10, 12, 13 units.

Useful advice! When buying a set of metal crowns, you must pay attention to the presence of a center drill in the kit. His absence is not will allow you to place the nozzle on the surface of the material exactly in the center.

Universal mobile installation: drilling magnet machine

A magnetic drilling machine is one of those devices that, when simplicity of design are highly efficient and cost-effective. By Compared to a stationary drilling machine, it has a number of advantages:

• no restrictions on hole placement;
• lightweight, mobile;
• inexpensive.

On a stationary machine is available to make holes only of small sizes, so as the distance between the crown and the working surface does not allow place large workpieces. The magnetic device can be attached to any metal surface by means of a special sole.

Such machines have various functional purposes. A 32 mm metal crown (and smaller bits) can be used to drill a hole in non-thick material. Circular cutters from 50 to 150 mm with a reinforced design are used for thicker metal material.

Related article:

Wood crown: sizes and types of nozzles, application features

Wood crown. Device and principle of operation. Varieties of hole saws. Features of the operation of nozzles of various diameters. Crowns Bosh, "Bison", "Enkor".

Magnetic some of the machines are quite powerful, it reaches 26 kN. This allows you to set the tool is not only horizontally but also tilted, even vertically. If the surface is not even enough, the magnetic field does not reach the required values, additional clamps are used to secure the machine.

Magnetic drilling machines are more often used for making holes in large-sized structures, therefore, metal crowns of 50 mm or more are the most common attachments for such devices.

Proven reliable tool: Bosch metal core bits

One of the most popular are Bosch metal crowns. Most of the products manufactured by this company are bimetallic, that is, made of two types of metal: the body is made of high-speed steel, and the teeth are soldered and have a slightly different composition, which includes cobalt.

Diameter the nozzles are very different, but the pitch is one inch: the minimum size is 9/16, then there is 14 mm, the maximum is 6, which corresponds to 152 mm. Some sizes in Bosch crown line may not be found.

Landing at Bosch standard models are 1/2 or 5/8 inches, so the crowns are matched with many types of power tools. Used as an adapter Power Change adapter. Replacing an annular cutter is easy and quick, to do this, pull out the outer race - the adapter will push the crown out.

It is very important to maintain the required number of revolutions. A 29 mm bit requires a frequency of 400 rpm, and a 40 mm metal bit requires 200 rpm. These requirements significantly extend the service life of the bit.

Concerning the price of Bosch ring cutters for metal, then it should be attributed to a moderate level. A crown of medium diameter (38 mm) will cost about 800 rubles. Although the cost of individual products may exceed this indicator. Offers given company and sets of hole saws. A set of 11 bimetallic items costs an average of 8,000 rubles.

Crowns for metal "Zubr": application features, prices

Crowns for metal "Zubr" - products of domestic production. Although it should be noted that a significant part of them are manufactured in China. Analyzing reviews on social networks, we can conclude that about 30% users have complaints about the quality of the attachments. Yet the majority appreciates a tool as reliable and fully justifying the operational capabilities.

The crowns are mostly bimetallic with a wave-like arrangement of teeth. The depth of the nozzles is standard - up to 40 mm. Size range of diameters - 14-152 mm. Crowns of this manufacturer have lateral holes for retraction shavings, which makes the drilling process more comfortable. Holes after Zubr crowns are neat, with a smooth inner surface and smooth outer edges.

The attachments are inexpensive, the smallest (14 mm) will cost 150 rubles. The price of a 110 mm metal crown will average 800 rubles.

Important! The resource of these crowns largely depends on the method of operation. From experience of use (information taken from user reviews) it follows that ring cutters "Zubr" should not cut metal thicker than 2 mm, or additional water cooling must be applied.

Quality Chinese version: crowns by metal Fit

Fit crowns made in China. During production, Canadian technologies are used. The company has many large branches in the Russian market. Like many others manufacturers of similar goods, the bulk of the crowns are bimetallic products.

Fit rotary cutters can be attributed to the mid-price segment, which makes them quite popular. A 25 mm metal crown will cost 400 rubles, 30 mm - 500 rubles, 35 mm - 600 rubles.

Small and medium sized bits have a triangular shank and each model is equipped with a center drill. A distinctive feature of this manufacturer's crowns is the absence of an external protective coating. This should in no way be regarded as a disadvantage. The chrome vanadium housing does not need this addition. The absence of traces of damage to the coating, although it does not affect the result of the instrument's operation, helps to preserve the aesthetics of the product. As a result, the process of working with a crown becomes more comfortable.

It should be noted that the metal thickness of 2 mm is not the limit for these attachments. For example, with a 60 mm Fit metal crown, you can drill a 3 mm sheet without harm to the cutting edge and without additional cooling. The shank of nozzles more than 32 mm hexagonal, which allows you to firmly attach the cutter body to the power tool.

Metal crowns "Enkor": sets and individual nozzles

"Enkor" is a domestic trade and production company, which has tens of thousands of names of various products, including metal crowns. It should be noted that among the nozzles offered by this manufacturer there are both bimetallic models and simpler ones made of carbide material.

This choice allows buyers to find a suitable option in accordance with their financial capabilities. A 22 mm metal carbide crown will cost a little more than 100 rubles.

Dimensional indicators of Enkor nozzles can be referred to as standard: depth - up to 40 mm, diameter - from 14 to 152 mm.The crowns can be supplied as a complete set with a holder and a center drill, or separately - the main body with a cutting edge. The latter option is convenient for those who already have ring cutters of other sizes. The product is also suitable for applications where there is a need to replace the bit due to significant wear on the cutting edge.

Useful advice! For more comfortable use, it is worth purchasing Enkor crowns with ejection spring, which prevents the drillable fragment get stuck in the nozzle body.

The available option is also a set of crowns from this manufacturer. For example, a set of 9 attachments can be purchased for only 3250 rubles. The minimum crown diameter is 19 mm, the maximum is 64 mm. In the set includes a wrench, two adapters and a center drill. Small size transport case make it convenient to store the tool.

Metal crown: tips for correct use

Almost all of the new tools are attractive. On the pages of online stores, you can find a meaningful description of the product, sometimes even supported by positive customer reviews. In order not to be disappointed with the purchase, it is necessary to seriously approach the study of the capabilities of the instrument. You can evaluate drill bits for metal in the following sequence.

1. You need to make the right choice, for this you should carefully read the labeling information. The packaging must indicate dimensional indicators, country of origin (which to a certain extent says about the quality of goods), material of manufacture, features of accessories and devices. If the marking does not provide complete information about the annular cutter, there is reason to doubt the quality of the tool.
2. During use, should not be neglected manufacturer's recommendations. Improper use of the crown will result in damage to the instrument.
3. If the kit does not include a center drill, you need to purchase it taking into account certain requirements. For example a drill drill bits must have a cross sharpening, otherwise instant and accurate centering will not work.
4. On the need to regulate the number turns in the article were said more than once. It should be emphasized that this condition is perhaps the most important for increasing the service life of metal crowns.

With the correct selection and use of crowns, a hole in the metal can be made in a matter of seconds. The tool is applicable for various household and industrial purposes. Compliance with technical requirements can extend the service life for a long time. Conversely, one thoughtless use can provoke defects that make the crown unusable.