Metal crown: types, sizes, methods of application

Metal crown: types, sizes, methods of application

The metal crown gradually took its rightful place among the household tools. The presence of this nozzle in many cases allows you to save money and time on wages and 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.

When choosing a metal crown, the presence of a centering drill should be taken into account

Metal ring crown: technical features and method of application

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

Core drills used for processing metal products are also known as “ring cutters”

It is not difficult to cut a pipe, a corner, a sheet using a metal saw blade. To connect the workpieces into the structure, it is most often necessary to make a hole that is made in the metal with an annular crown cutter. The crown design consists of the following elements:

• metal cup;
• cutting edge;
• the shank.

The cutting
part has the form of teeth, which can be a continuation of the metal
cylinder body or be soldered fragments.

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

The principle of operation of ring drills is based on the method of crown milling

Ring
saws for metal differ in two ways:

• by size;
• according to the characteristics of the material from which they
  are made.

The range
of dimensions of the diameters is quite wide – from 14 to 152 mm. As for
the features of the material, you should know that models are made of hardened and
alloy steel, and the latter are particularly durable.

Carbide crowns for metal: good quality and affordable price

Despite the rather narrow scope of application of crowns, it is almost impossible to find a verified and clear
classification of them. When labeling products,
manufacturers resort to their own definition of differences. And the names
can be used differently: “crown drill”, “crown”, “circular saw”,
“ring milling cutter”. And this is not the whole list.

The division into types based on the characteristics of the manufacturing material is even more confusing. The designation “20 mm alloy steel metal crown” is true, but it does not give any idea about the product at all. All crown nozzles for metal are made of steel. Any steel has additives, that is, it is alloyed, supplemented with components that strengthen or change its physical characteristics.

Carbide crowns are used both in everyday life and in large-scale construction

The most common formulation is “high–speed steel crown”. Such steel belongs to high–alloyed types, its composition necessarily includes the following substances: tungsten – 19%, vanadium – 2.6%, molybdenum – up to 3%, chromium 3.5-4.4%. Such a combination of components makes the milling cutter durable, resistant to wear for a long time, red-resistant, that is, not subject to deformation at temperatures up to 600 ° C.

Carbide crowns made of such material are widely used, they
are used both in everyday life and in large-scale construction.

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

Bimetallic crowns 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%. In this combination, the material acquires the qualities necessary for efficient cutting of various types of metal, including stainless steel, aluminum, copper, brass, etc.

Bimetallic crowns are made of high-quality high-speed steel, alloyed with 8% cobalt

The diameter of these saw nozzles can be very different, but most often tools of medium and large sizes (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 variants – 900-1300 rubles.

The main
technical and operational characteristics of bimetallic crowns
include:

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

Bimetallic crowns – made of two types of metal

Useful advice! Bimetallic crowns are more often used to make holes in
hard and thick metal. When choosing a nozzle, you should definitely pay
attention to its compliance with the power tool that you plan
to use

Diamond
metal crown for
drilling stone, concrete, ceramics

The first diamond crowns had a steel body with
stones of natural origin inserted on the cutting surface. It was a very effective
tool, but it cost a lot of money. Modern industry produces
artificial diamonds, which in terms of performance are not inferior
to natural ones, 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 cutting is performed directly by the latter. The undercuts are located on
the inner and upper parts of the end part, they serve to protect the teeth from
wear.

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

The diamond crown is designed for hard stone: concrete, granite, marble

Useful advice! The diamond coating on the crowns can be different. Therefore, when choosing
a nozzle for drilling stone with metal inserts, you should correctly
assess the thickness of the latter and choose an annular cutter with a suitable cutting
end

How to
choose a drill for
metal crowns

A very important point that ensures the normal operation of the ring cutter
is the conformity of the nozzle to the power tool used. Drills are most often
used as a rotary device. They have different
technical characteristics. Here it is necessary to pay attention to the following
indicators:

High-power drills are used to drill holes using crowns

The 22 mm metal crown does not require changing the spindle rotation 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 frequency under load (constant electronics) can be a convenient option. The power tool will adjust the speed according to specific conditions.

Financial
gain and empowerment: sets of crowns for metal

If there is a question of choosing a crown for making holes in metal,
it means that a lot of things in the house are done with their own hands. What should we stop at:
buy a nozzle for a specific single purpose, or buy a set, looking
into the future and warning of the need? In an uncharacteristic single case
, it is worth stopping at a separate product. Moreover, it would be useful to weigh and
calculate what quality is worth paying attention to.

Even for a layman who wants to have a certain arsenal of home tools, it is better to prefer a set of metal crowns for a drill. Advantages of purchasing this kit:

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

A set of crowns is much cheaper than separately purchased nozzles

If you try to assess the financial benefits of purchasing a set, the calculation will be approximately as follows: the price of a 40 mm Anchor metal crown is 270 rubles, a set of 5 similar cutters from this manufacturer has a cost of 760 rubles. The price of one nozzle (averaged) is almost two times less.

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

Useful advice! When buying a set of crowns for metal, it is necessary to pay
attention to the presence of a centering drill in the kit. Its absence will not
allow you to install the nozzle on the surface of the material exactly in the center.

Universal
mobile installation: drilling
machine on a magnet

The drilling machine on a magnet refers to those devices that, with
their simplicity of design, have great efficiency and profitability.
Compared with a stationary drilling rig, it has a number of advantages:

• has no restrictions on the placement of holes;
• lightweight, mobile;
• inexpensive.

Magnetic drilling machines are designed for drilling, milling and threading in metal workpieces

On
a stationary machine, it is available to make holes only of small sizes, since
the distance between the crown and the work surface does not allow
placing large workpieces. The magnetic device can be fixed on any
metal plane by means of a special sole.

Such machines have different functional purposes. With the help of a 32 mm metal crown (and nozzles of smaller diameters), it is possible to make a hole in a non-thick material. Circular cutters from 50 to 150 mm of reinforced construction are used for thicker metal material.

Related article:

Crown on wood: sizes and types of attachments, application features

Crown on wood. The device and the principle of operation. Varieties of ring saws. Features of the operation of nozzles of various diameters. Bosh crowns, “Bison”, “Anchor”.

The magnetic
part of the machines is quite powerful, it reaches 26 kN. This allows you to install
the tool not only horizontally, but also at an angle, even vertically. If
the surface is not smooth enough, the magnetic field does not reach the required
value, additional clamps are used to secure the machine.

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

The machines are equipped with electric and pneumatic drives

Proven reliable tool: Bosch metal crowns

One of the most popular are Bosch metal crowns. Most of the products produced 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.

The diameter
of the nozzles is very different, but the pitch is one inch: the minimum size is 9/16, that
is, 14 mm, the maximum is 6, which corresponds to 152 mm. Some sizes in
the line of Bosch crowns can not be found.

The fit of the
Bosch models is standard – it is 1/2 or 5/8 inches, so the crowns are combined
with many types of power tools. The
Power Change adapter is used as an adapter. The replacement of the ring cutter is not difficult and not for long,
for this it is necessary to remove the outer clip – the adapter will push out the crown.

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

Bosch crowns are made bimetallic, that is, made of two types of metal

As for
the price of Bosch ring cutters for metal, 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.
This company also offers sets of circular saws. A set of 11 bimetallic products costs
an average of 8000 rubles.

Crowns for metal “Bison”:
features of application, prices

Crowns for metal “Zubr” are products of domestic
production. Although it should be noted that a significant part of them are made
in China. Analyzing the reviews in social networks, we can conclude that about 30%
of users have complaints about the quality of the nozzles. Nevertheless, the majority assesses
the tool as reliable and fully justifying the operational
capabilities declared by the consumer.

The crowns are mostly bimetallic, with an undulating arrangement of teeth.
The depth of the nozzles is standard – up to 40 mm. The size range of diameters is 14-152
mm. Crowns of this manufacturer have side holes for
chip removal, which makes the drilling process more comfortable. The holes after
the “Bison” crowns are neat, with a smooth inner surface and
smooth outer edges.

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

The holes after the “Bison” crowns are neat, with a smooth inner surface

Important! The resource of these crowns largely depends on the method of operation.
From the experience of application (information taken from user reviews), it follows that
it is not necessary to cut metal with a thickness of more than 2 mm with Bison ring cutters, or it is
necessary to use additional water cooling.

High-quality
Chinese version:
metal crowns Fit

Fit crowns
are made in China. Canadian technologies are used in the course of production.
The company has many large branches in the Russian market. As with many other
manufacturers of similar goods, the main part of crowns are bimetallic
products.

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

The nozzles of small and medium sizes have a triangular shank, each model is equipped with a centering drill. A distinctive feature of the crowns of this manufacturer can be considered the absence of an external protective coating. This should in no way be regarded as a disadvantage. The chrome-vanadium case does not need such an addition. The absence of traces of damage to the coating, although it does not affect the result of the tool, but helps to preserve the aesthetics of the product. As a result, the process of working with the crown becomes more comfortable.

The metal ring crown FIT is used for drilling holes in stainless steel

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

Metal crowns “Anchor”: sets and individual nozzles

Anchor is a domestic trade and production company that has tens of thousands of names of various products, including metal crowns. It is worth noting that among the attachments 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 carbide crown for a 22 mm metal will cost a little more than 100 rubles.

The dimensional parameters of the Anchor nozzles can be attributed to the standard: depth – up to 40 mm, diameter – from 14 to 152 mm. Crowns can be supplied with a holder and a centering 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 acceptable for those cases when there is a need to replace the crown due to significant wear of the cutting edge.

Anchor nozzles are made of both bimetallic models and hard-alloy material

Useful advice! For more comfortable use, it is worth purchasing Anchor crowns with
an ejector spring, which does not allow the drilled fragment
to get stuck in the nozzle body.

Sets of crowns from this manufacturer are also an affordable option.
For example, a set of 9 nozzles can be purchased for only 3,250 rubles.
The minimum diameter of the crowns is 19 mm, the maximum is 64 mm. The kit
includes a wrench, two adapters and a centering drill. Small size
the transport case makes it convenient to store the tool.

Metal crown: tips for proper use

Almost all of the new tool has an attractive appearance. On the pages of online stores, you can find a meaningful description of the product, sometimes even backed up by positive customer reviews. In order not to be disappointed with the purchase, it is necessary to seriously study the possibilities of the tool. It is possible to evaluate drill bits on metal in this sequence.

The centering drill must necessarily be included with the crowns

With the right 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 will make the crown unusable.