home/Tools/Wood crown: sizes and types of nozzles, application features
Wood crown: sizes and types of nozzles, application features
The chisel as the main carpentry tool for making holes and recesses in wood has largely lost its relevance. Along with this, the problem of curved cavities and the need for constant sharpening of the tool went away. The laborious process is simplified with a device that can easily perform circular drilling. A wood crown makes holes perfectly straight in minutes.
Crowns are large diameter wood drills that have a cutting edge in the form of teeth
Varieties of wood drills: from fine spirals to large crowns
Wood is a versatile material that can be used both in the manufacture of elegant decorative elements, and in the construction of buildings and other large-scale objects. Wood is easily processed; for this purpose, the industry produces a large number of tools for various purposes. Among them are the following:
twist drills. There is such a tool in almost every home. The diameter of the nozzles has a range of 3-52 mm. Drills up to 10 mm are made with a smooth shank, more powerful products are equipped with a hexagonal element, which contributes to a strong clamping, which is necessary due to the increased load on the cutting segment;
One type of ring drills considered a crown for wood
feather drills. The tool is quite difficult to work with. Outwardly it resembles a knife sharpened from different sides. The functionality of such a nozzle is limited, it is not recommended to make deep holes with it, since the removal of chips is not provided;
Forstner drills. The side blades are located in a circle. The tool gives very clean cuts, is made of durable carbon steel;
crowns. These are drills for wood of large diameter, having a cutting edge in the form of teeth, located at the round end.
The content of this article will be devoted specifically to crowns, their technical characteristics and methods of application.
Drill bit for wood: device and principle of operation
A hole saw for wood, also called a crown, core drill or end mill, is made in the form of a cylinder, one end of which ends with a shank, and the other has a serrated cutting edge. This device serves as an attachment to the twisting elements of drills, hammer drills, screwdrivers intended for manual work. It is possible to use circular cutters for machine tools.
The crown is installed in a special glass and fixed with a nut. Each hole saw comes with a drill that protrudes beyond the line of the cutting teeth to accurately locate the center of the hole and ensure a perfectly straight cut.
The cutting head is manufactured as a one-piece cylindrical edge with sharp teeth
The crown can be either a monolithic structure - a cylinder with a toothed edge, and a collapsible one - cutting rings of different sizes are inserted into a round seat.
If it is necessary to make a perfectly correct and clean hole, use bimetallic bits for wood. They are made from high strength steel and cobalt. This connection makes the tool durable in operation.
Useful advice!When choosing a crown for wood, you should carefully study its technical characteristics and compare it with the equipment available with a perforator (drill, screwdriver). Non-compliance can lead to both damage to the crown and damage to the power tool.
Technological parameters and dimensions of wood crowns
The operational capabilities of the crown directly depend on its technological parameters. It is they who are evaluated when choosing a particular type of nozzle. The main indicators include:
height. It is equal to the distance from the surface to the lowest point of the recess that the cutter makes in one pass. Usually it is standard and equal to 40 mm;
The crown consists of a cutting head, a shank and a pilot drill with a pointed end
diameter. Wood crowns differ depending on the outer diameter of the cutting part. Products from the sets have an indicator of 30-150 mm. Separately sold attachments can be up to 300mm in diameter;
number and profile of teeth. The larger the bit diameter, the more teeth the cutting edge is equipped with. They can be in the form of a regular triangle or they have a top inclined by 30-40 ° (the slope is the same for all teeth);
additional tool functions. Some devices can perform reverse rotation, that is, change the direction of movement of the crown. This option is most often used by professionals in their work;
engine power and the ability to adjust the speed. These figures should be comparable to the type of packing. For example, when using a 68 mm wood bit, the permissible speed is 950 rpm. For a 110 mm bit - 500 rpm. The larger the bit, the fewer revolutions are needed to get the job done well.
Important!If it is impossible to reduce the number of revolutions on the working power tool, use a special stand, which can be purchased from the relevant stores.
Scope of application and features of operation of wood crowns 50, 60, 68 mm
One of the quite often used is a crown with a diameter of 50 mm. It can be sold separately or as a set. The nozzle is made of carbon steel, but you can find products made of hardened metal. The number of cutting teeth is 30-34 pcs. Any kind of this natural material, including laminated wood boards, is allowed to process with a 50 mm wood crown.
Samples with a diameter of 68 mm are suitable for many types of work
For hardwoods (oak, hornbeam, beech, etc.), circular saws made from carbon steel or bimetal are better. Such nozzles will cope well with a dense structure, making a neat and correct cut, and will also last much longer.
The technical and operational characteristics of 60 mm wood crowns largely coincide with the properties described above for models with a diameter of 50 mm. The option is in demand, it is used for various household needs, as well as in the manufacture of furniture. You can purchase crowns with a diameter of 50, 60 mm in any store selling power tools, as well as directly from the manufacturer. The second option will not require overpayment for commercial services. The simplest metal models will cost 100-130 rubles.
The crown with a diameter of 68 mm is a "classic of the genre". This is the most common and frequently used model, since it is used to make sockets for boxers in wood walls and wall sandwich panels, which include wood-based panels. The attachments are made of alloy or carbon steel, which ensures a perfect cut of wood of any quality.
Crown for wood 100 mm, 110 mm, 120 mm: types, prices, material of manufacture
Crowns with a diameter of 100, 110, 120 mm are more often used for the manufacture of decorative items. During the repair, they can be used to install junction boxes of various communications. This diameter requires the appropriate power of the power tool to which the nozzle will be attached, and it should not be less than 800 W.
Using nozzles with a diameter of 120 mm, you need to select the appropriate power tool
Wood crowns 110-120 mm are of the medium size type, so all manufacturers have them, which allows you to choose the appropriate option both in terms of technical and price indicators.
Products can be sold as separate attachments or as removable rings as part of sets. High-strength steel is used as a material for manufacturing. Some manufacturers (Bosh, Matrix, Biber) make bimetallic hole saws of this diameter, which are distinguished by high strength and good resource.
Before using this size, you do not need to pre-cut the hole, and after drilling, there is no need to process the inner surface.
The price range of these attachments is significant. For example, a crown for wood 120 mm Matrix costs 300 rubles, an analogue from the manufacturer "Enkor" - 80 rubles.
Crowns can be sold as separate tips or as removable rings in sets
Technical and operational characteristics of wood crowns 127 mm, 150 mm, 160 mm
Wood crowns 127, 150, 160 mm are referred to as large-diameter nozzles. Almost all of them are bimetallic models, as drilling large holes requires a robust cutting tool. The 127 mm crown may be sold separately, but is often the largest tip in the crown set.
The price of a separate bimetallic version reaches 1000 rubles. A set of metal crowns can be purchased for almost the same money - 900-1000 rubles.
Crowns for wood 150 mm are successfully used in repair work. With their help, holes are made for ventilation, lamps, septic tanks are equipped. For such a crown, a power tool with the ability to adjust the speed is required. The first cuts are made at a frequency of 950-1300 rpm, for subsequent cuts it is necessary to reduce the rotation speed to 500-600 rpm.
The most popular are DeWalt and Bosh crowns. Products of these manufacturers have increased strength, in which the cutting part is not damaged even when it hits metal elements.
Crowns with a diameter of 127 mm are most often sold in sets
Wood crowns 160 mm can be used for decorative woodwork, as well as for construction or renovation work in houses built from timber. This bimetallic packing successfully penetrates even the hardest layers of wood, leaving behind a perfect inner surface.Technical and operational characteristics practically coincide with the properties of 150 mm crowns, but the price is slightly higher (by 10-12%).
Useful advice!When making holes with large-diameter crowns in chipboards, do not put pressure on the cutting edge in case of difficult passage - small chips may form on the upper edges of the hole.
Wood crowns 210 mm: selection of power tools, prices
The crown with a diameter of 210 mm is a reliable bit. More often it is acquired by professionals to carry out construction and repair work. Moreover, you can make holes with it not only in wood, but also in gypsum, sheet steel, and plastic. The product is bimetallic, durable.
Not every power tool is compatible with this attachment. It can be a hammer drill or a powerful drill. No screwdriver will provide the full performance of such a hole saw. The power of the device must not be lower than 1300 W. The function of changing the speed is required. A nozzle of this size is often used for stationary devices, since it is rather problematic to operate a hammer drill with such a cutter in manual mode.
The price for crowns with a diameter of 210 mm differs significantly from different manufacturers
For trouble-free and high-quality work of crowns on wood of large diameter (210-250 mm), the number of revolutions should be set correctly:
the optimal indicator for drilling softwood is 350-400 rpm;
when making holes in hard tree species - 500-600 rpm.
These attachments are often sold as a standalone option rather than a kit. The price of a 210 mm crown differs significantly from manufacturer to manufacturer. For example, a similar hole saw by the American company DeWalt will cost 630 rubles. The Zubr nozzle with absolutely identical technical and operational characteristics costs 1,030 rubles.
Wood crowns Bosch: types of attachments, application, prices
Bosch tools have long been established in the domestic market and almost always occupy a leading position. Bosch is a brand that does not enjoy its former merits, and the constant improvement of technologies confirms its status. Products of this manufacturer are distinguished by the following characteristics:
good quality material. Small-diameter bits are mainly made of high-speed steel, bits for wood 110 mm and more are bimetallic (high-speed steel is alloyed with cobalt), resistant to mechanical stress and providing an even cut when making holes;
Bosch crowns are durable, do not overheat, do not deform during the sawing process
variety of species. Bosch offers drill bits in sizes from 14 to 152 mm, sets with a complete set of 5-13 bits, saw rings for 5-8 pieces. The latter are a convenient option for making rough holes in hard and soft materials;
optimal equipment. All bits of this manufacturer come with Power Change adapters: for drills - this is a hexagon, for rotary hammers - an SDS Plus mount.
Concrete crown... The principle of operation, the main types of nozzles. Standard crown sizes, application features. Tool resource. The basics of making the right choice.
Bosch crowns can be used to make holes in sheet metal, wood, laminated wood boards, drywall, plastic, laminate, in multilayer materials. The price of crowns ranges from 400 rubles for a 14 mm nozzle, 1000 rubles for a 120 mm wood bit to 3500 rubles for a 300 mm bimetallic hole saw.
Important!Choosing a Bosch crown, you should at the same time purchase cutting oil and a spare centering drill (if you plan to use the hole saw intensively and for a long time) from this manufacturer. These essential consumables will ensure the quality of the tool for a long time.
A worthy product of domestic production: a set of wood crowns "Zubr"
Zubr is a domestic manufacturer of hand-held power tools, including core drills for working on wood, wood materials, gypsum, and plastic. Wood crown sets are especially popular. Zubr is a company that not only produces high-quality goods, but also provides its worthy accompaniment, taking care of customers. By picking up the cardboard packaging, you can easily find on it all the necessary information about the number of objects, the quality of the material, the method of use and the suitability for the power tool.
The Zubr company produces wood drill bits with centering drills from high-tech tool steel
The units of the kit are conveniently placed in a compact plastic case, on the inside of the upper part of which there is a detailed assembly diagram of the nozzle. The standard kit contains the following items: 5 hole saws, center drill, hex shank, cover plate and wrench. The sets can have different sizes of drills: from 64 to 102 mm, from 33 to 83 mm, etc.
The main material for the manufacture of wood crowns "Zubr" is high quality carbon steel. The medium tungsten carbide chips, which form the basis of the spraying, allow for smooth cuts and significantly extend the life of the cutting edge.
A set of ring nozzles costs 500-700 rubles. Sets with a large number of circular saws (10-12) have a price of 1000-1500 rubles.
Affordable and functional option: wood crowns "Enkor"
Enkor crowns are made in China, sold by a Russian company located in the city of Voronezh. Compared to Bosch products, these attachments are a simpler option, but they do not lose their performance. They can be used to make blind and through holes in wood, wood-based panels, drywall and plastic.
Enkor crowns are installed on an ordinary household drill, suitable for working with wood, plastic, plywood, chipboard, MDF
For the manufacture of nozzles, high-strength steel is mainly used, which has an outer coating that protects against corrosion. For the sake of objectivity, it should be noted that the protective layer during work is significantly damaged by mechanical stress, therefore, for the safety of the tool, it is worth providing the necessary conditions.
"Enkor" bits up to 65 mm have a 19 mm shank, wood crowns 68 mm and more are equipped with a 32 mm mount.
It should be noted that the products of this manufacturer differ in a variety of sizes, which allows you to select the desired diameter and make a hole without additional reaming and unnecessary voids. For example, in the range from 80 to 90 mm, you can choose the nozzle 80, 82, 85, 88, 90 mm.
Hole saws "Enkor" and affordable prices are characterized. A 22 mm crown can actually be purchased for only 50 rubles. A very popular version of the nozzle with a diameter of 70 mm costs 100 rubles. The price of a 127 mm crown is 175 rubles.
Bimetallic products do not dull for a long time, even in contact with nails, reinforcement
Hole saws from this manufacturer do not have a long resource. With proper use and storage, they will serve for a long time, adequately fulfilling their purpose.
Simplicity of the device and ample opportunities: ballerina on wood
If it is necessary to make a large hole in the material, a drill can be used, which in everyday life has received a very euphonious name - ballerina (by the external similarity of the divorced cutting elements of the device with the image of the dancer). Such a device consists of a centering drill and cutters, which move along the guide in different directions at the same distance, thereby marking the dimensions of the diameter of the future hole. Most ballerinas have two incisors, but there are models with three.
The principle of operation of this type of drill bit:
a central drill makes a hole in the material;
the incisors mark a circle line that determines the size of the future groove;
manually (using a brace) or using a rotary power tool, the device is set in motion.
Most ballerinas have two or three incisors.
The ballerina can make holes in wood, wood materials, drywall, ceramic tiles, plastic. Such a nozzle is inexpensive and is quite suitable for non-professionals.
Useful advice!When using a ballerina as a nozzle for a manual mechanism, efforts should be made in the centering and the first rotational movements of the incisors, outlining the contour of the future recess. Uncertain movements can cause chipping at the top edge of the material.
Wood crown: conditions for correct use
For a tool to function properly, it must be properly used. This means compliance with the norms and requirements of technical conditions, application in accordance with the purpose and compliance with the rules in the course of work:
a drill with a crown attachment cannot operate continuously for a long time, as it gets very hot. It is necessary either to equip the instrument with an additional cooling system, or to take a 15-minute break after every 30-40 minutes of work;
You should choose drills for crowns with high power, comfortable grip
manufacturers do not produce special crowns for drywall; wood cutters are used for drilling this material. The power of a power tool with a torque can be much lower than the optimum value for drilling, for example, beech;
when working with crowns, consider the way the shank is connected to the cylinder. If flat soldering is used, it is necessary to avoid side loads on the device and be sure to take breaks in work in order to prevent overheating and the appearance of defects at the junction. In the case when the shank is embedded in the seating part of the crown and soldered, an additional support appears - a collar, as a result of which the strength of the connection becomes much higher;
it is necessary to pay attention to the price of wood crowns. You cannot intensively use a nozzle purchased for 50-70 rubles and rely on a long period of its full-fledged work. For this type of instrument, the price and resource are in direct relationship.
With proper use, the tool will last much longer
Any tool requires skillful use of it. When working with crowns-nozzles, it is not so much experience that is important as awareness of the technical capabilities of the device and the intended application. The market offers hole saws for both the hobbyist and the professional. It is important to make smart choices.
