The carbide tip hole saw is used for cutting round holes in tile, stone, cement slab etc., and is necessary when laying tiles around water taps and pipes, as well as for cutting tiles laid around the corners of the sink. This tool cuts both soft and hard tiles, although cutting glazed tiles is quite slow.
The hole saw is secured in an electric drill using a chuck, into which a 6 mm diameter center drill with a carbide tip is also inserted. You can saw dry, but if you drill a hole in a separate, unsecured tile, it breaks easily. The reason is that the hole saw cuts rather slowly and causes the tile chips and dust to heat up and collect around the hole being cut. (Thermal shock is not a problem with other saws. When cutting electric tile cutter the disc is cooled by water, and the diamond disc for dry cutting has no teeth and cuts quickly enough, which avoids heating the dust, so that the tile does not have time to heat up too much).
To prevent the tile from overheating during drilling, it is dipped in a container of water.. Water washes away heated dust and debris and cools the tile, protecting it from damage; Using water also extends the life of cutting tools.
Unfortunately, immediate proximity to water and electricity can be dangerous. Battery-powered tools do not pose the same dangers as corded electric tools, but in most cases do not have the power and rotation speed required to produce clean, smooth cuts on tile or stone. (If you choose to use a battery-powered drill, be sure that the power source, consisting of batteries, will quickly discharge, since drilling holes requires a lot of electricity).
The solution to the problem is to connect your power tools, which you constantly use, to protective device shutdown (RCD), which automatically disconnects tools from the power supply in the event of a leak. You can plug into an existing grounded outlet or buy or rent portable version RCD.
To hold the tiles while cutting, make a plywood box slightly larger than more tiles and isolate the corners. It is better to fill the box with water so that the tiles are covered with a layer of water of about 5-6 mm. Before immersing the tile, lightly tap the center of the tile with a punch to create a puncture in the enamel and prevent the center drill from slipping. Then press the tile into place with the drill bit in the center and turn the drill on at normal speed. As soon as the drill passes through the tile, the hole saw is lowered onto the surface of the tile and then the drill speed should be reduced.
While cutting, try not to press too hard on the saw, as this may cause the tiles to crack. .Allow the hole saw to guide itself into the tile. Since the hole saw is best cut at speeds ranging from 100 to 200 rpm, it is a relatively safe tool. However, it can cut skin and bone, so it should be handled with care.
- Design features
- Preparing for work
- Models
- DeWalt
- Bosch
For forming holes large diameter The ring cutting method is used. Used for work hand power tool, ring attachment for drill. One of the types of ring drills is a wood crown.
Scope of use, main characteristics
Wood crowns are designed for cutting through holes, most often used to provide a seat for a socket box. With their help, using a nozzle with a certain coating, they process wood,, , concrete, plastic, metal.
Samples with a diameter of 68 mm are suitable for many types of work.
Core drills up to 65 mm wide are equipped with a shank with a diameter of 19 mm. Samples bigger size - fastener diameter 32 mm. The number of toothed segments on the ring depends on the size of the drill bit. On average, hole saws have between 2 and 16 teeth.
Hole drills are also used to create a clean cut with a smooth inner surface of the groove. After work, there is no need to modify the workpiece or remove burrs, since they do not form. Before cutting holes, there is no need to pre-center or drill out the surface to be processed. As a result, work time is reduced and quality increases. It is possible to drill holes without dust or noise. The core cutter ensures comfortable work.
Design features
Regardless of what material the crown is intended to process, it includes several required elements. Consists of a cutting head, a shank and a pilot drill with a pointed end. The kit also includes a hexagon with which the drill is clamped in the chuck.
The cutting head is made in the form of a solid cylindrical edge with sharp teeth or as collapsible design with a round seat into which a cutting ring of the required diameter is inserted.
The ring does not close after installation in the socket and has the configuration of a cut cylinder. Usually they purchase a working tool with a set of cutters various diameters and one shank.
Stacked rings allow you to make grooves of a certain size and change attachments. Each core cutter has characteristic slots or holes: through them the chips are ejected and the wooden plug is removed. On large-diameter samples, the technological holes are located on top, on smaller models - on the side.
At self-production crown attachment is used metal pipe required diameter.
Preparing for work
The technological hole on the cup has irregular shape, which prevents the nozzle from turning in the socket. It is recommended to tighten the clamping nut firmly to ensure that the ring bit does not become loose when drilling slots in heavily loaded wood.
After the centering drill and cutting attachment are tightly fixed in their seats, the chuck is installed in a hand-held power tool and drilling begins. The hole is cut strictly perpendicular.
Before working on the drill, set the speed. Every additional millimeter to the groove diameter increases the vibration of the tool. Therefore, you should choose drills with high power, comfortable handle.
For wood, 300 rpm is enough; for hardwoods, it is better to set the regulator of a drill or hammer drill at 500 rpm. Sharpening of crowns is carried out in workshops or at home.
Models
Review of some drills.
Bison
The Zubr company produces wood crowns with centering drills made of high-tech tool steel. The centering drill provides increased rigidity when working with soft and hard wood. The bits are installed on a regular household drill and are suitable for working with wood, plastic, plywood, chipboard, MDF, and plasterboard.
DeWalt
Crowns are used to form grooves and holes when performing electrical installations and laying communication lines. Bimetallic products do not dull for a long time, even in contact with nails, fittings, and are durable.
Bosch
The crowns are durable, do not overheat, are not deformed during the sawing process, and can withstand a large number of drilling cycles without re-sharpening.
The table shows the sizes and prices of various types of crowns.
|
Diameter, mm |
Drilling depth, mm |
Price, rub |
||
|
Bimetallic |
||||
|
Bison "Expert" |
Bimetallic |
|||
|
Enkor 19157 (set) |
Tool steel |
|||
|
Bosch (set) |
Tool steel |
Hole saws or core saws represent a rather specific segment of the tool, which is due to technical and operational features. If classic saws work with cutting equipment that implements a straight cut, then a ring tool performs circular cutting. This, by the way, makes such models similar to traditional drills. During the work, a hole is also formed, only of a larger diameter and with minimal mechanical impact on the structure of the material. What is also important is that the hole saw, thanks to the design of the attachments, allows you to cope not only with cutting wood pieces, but also with concrete, metal and even stone.
Design features of hole saws
The ring saw complex is formed by two basic components. First of all, this is the equipment that provides the force that causes the nozzle to rotate. The main functional element is directly cutting blade. This can be a set of different sizes, or universal blades for a wide range of building materials, providing the ability to adjust the diameter.
A mandatory component connecting the power tool and the saw blade is the holder, or shank. The saw is screwed onto the holder before the working process, and after it is unscrewed with a hex key. In this case, the fixation mechanisms may differ. Hex holders are suitable for use in composition conventional drills, but more modern designs integrated into the system using the SDS-plus quick-release chuck. After completing the work, the hole saw must be freed from the cut part of the material that entered the empty niche of the crown. A special spring is designed to perform this operation. Removal of sawing products can also be done manually. This method is carried out through special slots on the sides of the saw blade.
Technical specifications
In the ring system, only one parameter remains constant and unified - this is the height, equal to 40 mm. Depending on the design, it allows you to saw holes with a depth of about 32-37 mm. The main characteristic is the diameter of the crown, which is provided with the hole saw. Its dimensions are divided into two groups - less than 30 mm and more than 30 mm. In the first group, the minimum value will be 14-16 mm. Manufacturers usually stick to one starting value and use it in all saws. Next, almost the entire range of digital values up to 30 mm is covered.
As for the range above 30 mm, its maximum is 150 mm. In this case, the step at the beginning of the dimensional corridor is on average 2-4 mm, and at its completion - up to 10 mm. There is also a special one produced in 168 and 210 mm formats. It is usually used for industrial purposes when equipped with a hexagonal shank diameter, in turn, ranging from 6.4 to 15.4 mm.
Functional support
Additional functions rather relate to the power tool that powers the saw blade. Depending on the workflow, cooling and dust removal options may be required. When working with concrete and metal, the loads can be excessively high, so cooling with water becomes a necessity and even a safety measure. For this purpose, drilling rigs are equipped with water tanks and its automatic supply to the working head. As an alternative experienced craftsmen It is recommended to simply stop the tool at times of peak loads. A dust removal system with the ability to connect an industrial vacuum cleaner is less often equipped with installations that include a wood hole saw, although this solution is theoretically possible. The introduction of a dust collector is more justified when processing concrete and stone surfaces, the released particles of which not only pollute the work site, but can also be dangerous for the operator.
Wood saw 29588 from Kraftool
The German manufacturer Kraftool produces reliable and ergonomic hole saws. The line contains kits for different purposes, but the most popular solution is kit 29588. This is a hole saw for wood, which is also used in working with plastics and drywall. As users note, the cutting part provides an almost perfect edge, which allows the workpiece to be used in the future for spot installation work.
The set includes crowns with diameters from 60 to 74 mm, so the set will also be used in professional construction work. Although a wood hole saw as such does not require special reinforcement of the functional blade, the Kraftool developers have specially hardened the teeth. Moreover, their layout is made in such a way that the sawdust naturally falls back through the side slots during the cutting process.
Metal saw BAHCO SANDFLEX
For processing metal workpieces, saws made of special material are used. In particular, SANDFLEX offers bimetal saws in 21 mm format. This equipment allows you to cut non-ferrous and ferrous metals, as well as wood. Thanks to the universal holder, the nozzle can be used with hand drills and machines. The drilling depth in this case reaches 38 mm. Again, the drill bit was made with the expectation of independently removing the chips beyond the limits working area. For this purpose, side holes are provided, but depending on the model of drill or screwdriver, it is possible to connect a separate system for removing processing products. By the way, the price offer from SANDFLEX is one of the most profitable in the segment - standard attachments of common formats are available for 300-400 rubles.
Concrete saw HRS from HYCON
Equipment for working with concrete also has its own characteristics. They are clearly expressed in the design of the saw presented on the market by HYCON. This is not just a hole saw, but a hydraulic hole saw that can also be used to form holes in reinforced concrete, brick and stone slabs. Such high technical and operational capabilities are due to the fact that the nozzles contain diamond sputtering. According to its characteristics, this saw belongs to a special segment, even within industrial sector. Suffice it to say that only a specially trained team can operate the equipment. To ensure safety, the hole saw in the HRS modification is equipped with an automatic shut-off. This function is triggered when you get stuck in a solid niche, which also happens when using units of this type.
Operating rules
First of all, the user must select a suitable power base for using the equipment. As already mentioned, it can be a drill, a hammer drill, or even a machine. Next, the optimal sawing mode and diameter are selected, if the possibility of its adjustment is provided. The hole making process must be done without excessive pressure. It is important to feel the cutting pace set by the equipment engine. Otherwise, the hole saw may become deformed or even lead to problems with the technical components of the tool. After completing the work, you should remove the processing product from the crown niche, and then check the integrity of the saw teeth and the condition of the power apparatus.
How to sharpen a hole saw for wood?
By virtue of design features The process of sharpening such saws is quite difficult to perform at home without special equipment. If you have the proper experience, you can use traditional way manual cutting. To do this, it is necessary to securely fix the equipment and, in accordance with the requirements for the condition of the teeth, use a file or other hard abrasive to modify their geometry. If you use a standard set of wood bits made from metal sheets, then this operation will not cause any special problems. However, bimetallic and diamond bits for solid materials are machined only in factory lines or on specially equipped construction sites.
Conclusion
Hole saws have many variations and designs. In choosing, the fundamental criterion will be the structure and material of the fabric. In particular, the wood hole saw set is highly adjustable and flexible. Kits for working with metal workpieces and concrete structures are more reminiscent of drill bits. The next step in choosing will be a specific size. It is important to consider that the final diameter of the hole may be several millimeters larger than planned, therefore, in some cases, when performing spot machining, you should initially select nozzles with a smaller standard size than expected. In terms of the quality of the material, there may also be different nuances of choice, but in this part it is worth relying on the possibility of destroying the structure of the target base. For wood and plastic, standard metal blades will be sufficient, and concrete structures can only succumb to diamond solid elements.
Greetings to all visitors to my site, where I talk about various types tool, I give advice and recommendations on choosing and working with one or another tool. Today we will look at a tool with which you can easily drill a large-diameter hole in thin wood, most often plywood, fiberboard and chipboard.
The tool is a hole saw for wood, most often sold in sets with different saw diameters. This is very convenient - I bought one such set and you can drill holes of any kind. large diameters, of course, if the saws that come in the set are of the diameter you need. Photo of this set:
For use at home, the Stayer set is quite suitable; it is optimal in terms of price and quality, moderately expensive, and comes with many saws of various diameters. It is worth noting that there are several variations of diameters, there are more complete sets with a large number of crowns, the diameters start from the smallest to the very large.
The most popular and best-selling set is 19-127 mm, this set contains 12 hole saws for wood of various diameters, it can be said to be universal, since it is almost always possible to select a crown for the desired diameter. However, its cost is 480 rubles. If you take sets with fewer attachments, then it will cost less.
So, let's look at the pros and cons of such a tool.
First the pros))
- Versatility - the ability to choose a crown for almost any diameter.
- Convenient suitcase, everything is stored in one place.
- Quick drilling of fiberboard, chipboard, plywood.
- The cut is unclean, unlike the holes drilled.
- Sometimes it is not possible to choose the right diameter, for example, for some spotlights.
- Drilling depth is only 30 mm. Of course, you can drill deeper, but you will have to knock out the wood every time when the crown rests on the tree, because it is not deep.
In general, a hole saw is the right tool for home. For example, I recently pulled a 110 mm pipe through a thin partition (double layer of chipboard with a 50 mm block between them). How to drill 110mm holes in plywood?
There are several options - you can use it using figured cutting. It's quite possible to drill round hole, however perfect circle it still won't work.
But take a set of circular saws, choose the diameter of the bit closest to 110 mm, assemble it and drill a smooth, beautiful hole in a few minutes.