Forstner bits
The
Forstner bit is a cylindrical tool used to create through
and blind holes in hard and soft wood.
It
was invented in 1874 and thanks to its unique design, it is still the
best solution for making holes with flat walls and bottom. To date, there are many variations of the bit (best Forstner bits), but most of them are made of the same material - high-speed steel. A
deep groove with a smooth bottom and side walls can not be made with a
spade bit, so the Forstner bit is an indispensable tool in the
furniture industry. It can not jam, since the cutting edges do not pull out the fibers of the material, but only cut them around the circumference.
Original Forstner bit has a centering point of a small size, an internal cutter, and a thick, rounded bezel for cutting. The outside edge is grinded by hand. Original Forstner bits was made of carbon steel, which does not contain any special additives and has a minimal amount of additional impurities. Due to the size of the centering point of the present bits, it is not possible to aim at the crosshair of the preliminary marking of the drilling, accordingly, only the outer diameter should be oriented.
Forstner bits with additional carbide cutters somewhat changes the overall design of the element. The cutting rim, which is located on soldered carbide cutters, is the basis of the tool design. Soldered cutting tools made of hard alloys make it possible to work on hardwoods, which is often necessary in the furniture industry. The high cost of the Forstner bit with carbide cutters is due to the similarity to the "real" bits. In operation, at an angle or along the edges of the object to be careful so as placing a small lateral incisors circumference exposure causes vibration during drilling, which can cause failure during operation.
Upgraded modernized Forstner bits have several key differences from the original one. First of all, the service life has been extended. In the modernized Forstner bit, the central point is increased in length, which allows them to aim at the cross-hairs marking of the work site. The cutting rim is considerably thickened, and also cutouts are made behind the inner-side blades to simplify the machine grinding behind. The modernized Forstner drill for the processing of wooden coatings is cheaper than the original version due to the reduced cost of the product.
Bit with a serrated crown (serrated ring
). Tool gear teeth is most often used for drilling holes of volume, as this type of drill has blades that reduce contact with the material of the surface area. These features ensure a low level of heating the drill during prolonged operation. As the drill bit with carbide cutters, this variation of the instrument has a high degree of exposure to vibration, because of what can be broken at the angle or at the edges of the object.
