This section provides an overview for fostner bits as well as their applications and principles. Also, please take a look at the list of 10 fostner bit manufacturers and their company rankings.
Table of Contents
A Forstner bit is a tool used to drill a "Forstnered" hole. Some types can be attached to electric drills and impact drivers. A countersunk hole is a cylindrical hole in which a screw or bolt is to be inserted. By tightening a screw or bolt in a washer hole the tip does not stick out of the wood and the surface does not become uneven. This process is necessary when a flat surface is required for a clean appearance or for the structure of the wood. The Forstner bit has a special blade that can flatten the bottom of the hole.
Forstner bits are used to form a feed hole. These holes are needed in a variety of situations to prevent the tips of screws and bolts from sticking out. An example is wood used in buildings. Large screws and bolts are used to join pieces of wood together, and if the tips of these screws and bolts protrude, they may interfere with the structure of the building or cause structural problems. It is also used for assembled furniture. Furniture that can be assembled by self-bolting is often forstnered with Forstner bits to improve the appearance of the furniture.
Forstner bits are an easy way to make a forstnered hole. Here we introduce the principle and features of this drill.
The structure of the drill is not so different from a normal drill, but the blade used for the drill features of the drill. Forstner bits have a flat circular blade, whereas a normal drill has a pointed tip. The center of the drill has a pointed blade called the center, which penetrates into the wood to drill a hole without any blurring. Around the center is a serrated blade, which rotates to form a countersunk hole. The shape of the blade varies, with some blades having a wave shape and others having three blades. They can be used according to the size of the hole and the intended use.
Holes drilled with Forsrtner bits are called "Forstner holes" and are often seen in construction sites and furniture. Screws and bolts can be fastened inside these holes without the tip of the screw or bolt coming to the surface. This is an important process on construction sites, where the wood is used in combination with other types of wood. It also allows for a clean finish to the appearance.
To use a boring drill, the boring drill is attached to the chuck of a drilling machine. When used for processing wood, it can also be used for manual processing, such as with an electric drill.
Common to both processing methods is the machining of the preparation hole. If a hole is not drilled, the drill will not enter vertically, making it impossible to drill an accurate boring hole, which may result in damage to the drill. There is also a machining method that does not use a boring drill. When using a milling machine for boring, an end mill can be used to drill the boring hole after drilling the pre-drilled hole.
A countersunk boring drill is a tool for machining the head of a countersunk screw in order to fasten it. Like a regular screw, it also serves the purpose of concealing the head, but with different characteristics: the head portion of the countersunk screw is firmly secured to hold the entire screw in place. Countersunk threads are difficult to machine with a normal boring drill, and it is assumed that a drill for countersunk threads is used.
Regarding the size of the boring drill, it is basically used to hide the head of the bolt screw to be fastened. Therefore, a boring drill larger than the head of the bolt is selected for the process.
Some products are sold as a set with a boring drill for each size, so you may consider this option if you need to drill for many different sizes.
This section introduces stepped boring drills for metalworking rather than general stepped drills (for steel plate drilling).
There are three types of drills to suit the head of each screw used primarily.
By using these stepped boring drills for metalworking, you can simultaneously drill a pre-drilled hole and a boring hole in a single operation without having to change tools. They are made to match the diameter of each bolt, and although they must be selected according to the diameter of the bolt to be used, they save time and cost by eliminating the need to change tools.
*Including some distributors, etc.
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