Hole or core saws represent a rather specific segment of the tool, due to technical and operational features. If classic saws work with cutting equipment that implements a straight cut, then the ring tool performs circular cutting. This, by the way, makes such models related to traditional drills. In the process of work, a hole is also formed, only of a larger diameter and with minimal mechanical impact on the structure of the material. What is more important, thanks to the design of the nozzles, the circular saw allows you to cope not only with cutting wood blanks, but also with concrete, metal and even stone.
Design features of hole saws
The ring-type saw complex is formed by two basic components. First of all, this is equipment, due to which a force is applied, causing the nozzle to rotate. The main functional element is the cutting blade itself. It can be a set of crowns for wood of different sizes, and universal blades for a wide range of building materials, providing for the possibility of adjusting the diameter.
A mandatory component that connects the power tool andsaw blade is a holder, or shank. The saw is screwed onto the holder before the work process, and after it it is untwisted with a hex wrench. In this case, the fixation mechanisms may differ. Hex toolholders are suitable for use with conventional drills, but more modern designs are integrated into the system via the SDS-plus keyless chuck. After completion of work, the hole saw should be freed from the cut off part of the material that entered the empty niche of the crown. A special spring is designed to perform this operation. Removal of sawn products can also be done manually. This method is carried out through special slots on the sides of the saw blade.
Technical parameters
In the ring system, only one parameter remains constant and unified - this is a height equal to 40 mm. Depending on the design, it allows you to cut holes with a depth of about 32-37 mm. The main characteristic is the diameter of the crown, which is provided by the circular 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 apply it to all saws. The following covers almost the entire range of numerical values up to 30 mm.
As for the range over 30mm, its maximum is 150mm. At the same time, 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 drill bit,produced in 168 and 210 mm formats. It is usually used for industrial purposes when equipping drilling machines. The diameter of the hex shank, in turn, varies from 6.4 to 15.4 mm.
Functional support
Additional functions are more like a power tool that powers the saw blade. Depending on the workflow, cooling and dust extraction options may be required. When working with concrete and metal, loads can be excessively high, so cooling with water becomes a necessity and even a safety measure. To do this, drilling rigs are equipped with water tanks and its automatic supply to the working head. As an alternative, experienced craftsmen recommend simply stopping the tool at peak times. A dust extraction system with the ability to connect an industrial vacuum cleaner is less often supplied with installations that include a hole saw for wood, although this solution is theoretically possible. The insertion of a dust collector is more beneficial when processing concrete and stone surfaces, the emitted particles of which not only pollute the work site, but can also be dangerous to the operator.
Kraftool Wood Saw 29588
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 wood typesetting ring saw, which is also used in workwith plastics and drywall. According to users, the cutting part provides an almost perfect edge, which allows further use of blanks for spot mounting 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 much reinforcement of the functional blade, the Kraftool developers have made a special hardening of the teeth. Moreover, their wiring is made in such a way that the sawdust in the process of cutting naturally leans back through the side slots.
BAHCO SANDFLEX metal saw
For the processing of metal blanks, saws made of special material are used. In particular, SANDFLEX offers 21 mm bimetal saw blades. Such equipment allows cutting non-ferrous and ferrous metals, as well as wood. Thanks to the universal holder, the nozzle can be used with hand drills and machine tools. The drilling depth in this case reaches 38 mm. Again, the drill bit was made with the expectation of independent removal of chips outside the working area. Side holes are provided for this, but depending on the model of the drill or screwdriver, it is possible to connect a separate system for removing processed products. By the way, in terms of cost, the offer from SANDFLEX is one of the most profitable in the segment - typical nozzles of common formats are available for 300-400 rubles.
HRS concrete saw fromHYCON
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 cutter that can also be used to cut holes in reinforced concrete, brick and stone slabs. Such high technical and operational capabilities are due to the fact that diamond spraying is used as part of the nozzles. According to its characteristics, this saw belongs to a special segment even within the 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 supplemented with an automatic shutdown. This function is triggered when stuck in a solid niche, which also happens when using units of this type.
Operating Rules
First of all, the user must choose a suitable power base for the use of equipment. As already mentioned, it can be a drill, a puncher, and even a machine tool. Next, the optimal sawing mode and diameter are selected, if it is possible to adjust it. The hole making process must be carried out without excessive pressure. It is important to feel the pace of cutting set by the engine of the equipment. Otherwise, the circular saw may be deformed or even lead to malfunctions in the technical filling of the tool. After completion of work, remove the processing product from the niche of the crown, and then check the integritysaw teeth and the condition of the power apparatus.
How to sharpen a hole saw for wood?
Due to the design features, the process of sharpening such saws is quite difficult to do at home without special equipment. If you have the proper experience, you can use the traditional method of manual grooving. 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 a standard set of wood crowns made of metal sheets is used, then this operation will not cause any special problems. However, bimetal and diamond drill bits for hard materials are machined only in factory lines or on specially equipped construction sites.
Conclusion
Ring saws have many variations and designs. In choosing a fundamental criterion will be the structure and material of the fabric. In particular, the wood hole saw set is adjustable and flexible. Kits for working with metal blanks and concrete structures are more like drill bits. The next selection step will be a specific size. It is important to bear in mind that the final diameter of the hole may be several millimeters larger than planned, therefore, in some cases, when performing spot processing, it is necessary to initially select nozzles with a smaller standard size than expected. In terms of material quality, there can also bedifferent nuances of choice, but in this part it is also worth relying on the possibility of destroying the structure of the target base. For wood and plastic, standard metal sheets will suffice, while concrete structures can only succumb to diamond solid elements.
