To sharpen a drill is very simple

In the household, the most popularThe power tool is a drill. Using a reliable assistant, you can not only drill almost any holes, but also cut out the places for the installation of wiring devices, including sockets, switches.
But for this you will definitely need a set of drills. Drills are produced for work with any materials.
The drills are dull and in need of sharpening.
The material below shows how to properly sharpen a metal drill bit.
Special tools are produced for drilling operations, the most common of which is the

drill Attention! To work with different materials special drills are produced with different angle of sharpening the drill bit.

In addition, the structure of the material influences the angles of the grinding. But about everything in order.

What is a drill and how to sharpen it

A drilling tool is a cutting tool that performs the cutting process due to rotary motion during axial feed.

Drills are used not only for making through holes of different diameters, but also for reaming already existing holes. By applying a drill, you can drill a through hole, make a groove of the desired diameter, drill to the required depth.

But to perform these works you will need a drill of the required diameter.

In addition, the drill must be properly sharpened.
And in order to learn how to sharpen a drill, you need to specify for which material the tool will be used.

Structural drills are available spiral, flat or perforated, ring, center, for deep or one-sided cutting.
Spiral drills are available in various diameters. The range is 0.1. .. 80 mm with the length of the working part up to 275 mm.
Flat drills are used to make large diameter holes for greater depth. Structurally, the cutting part is made in the form of a blade, attached to the holder.
Ring drills are made in the form of a hollow tube, which has a narrow ring cutting part.
Center drills are used for centering parts when turning.

But all these tools are dull in the process of work. And once drills are dull, they need to be sharpened. And to learn how to properly sharpen a drill, you need to imagine what material the tool will be used for and this will change the angle of incision.
The drill is the most dull bit when working on wood. If you use drills when drilling only on wood, then such drills do not require sharpening for several months or years. You just need to take care of their storage and use.
For us it is important to learn to sharpen drills when working on metal, concrete.

Sharpen drill bits for metal work

In order to learn how to properly sharpen a metal drill, it is enough to read the article below.
To produce grinding work, you need not only sharpening equipment, but also protection.
Protective goggles must be purchased from the protective equipment.
And for sharpening a drill is best to buy a grinding machine.

A few words about the sharpener

Most often, the grinding machine is made on the basis of a small electric motor of 220 V AC.

Speed ​​of grinding machine from 1500 rpm.

The machine must be equipped with a clear protective screen, a stepping stone.

At home, do not use drill bits larger than 16 mm.

So how do you properly sharpen a metal drill if the drill is blunted?

The fact that the drill requires sharpening can be judged by the emerging characteristic squeaking when drilling, especially at the beginning. At the same time, the drill starts to get very hot, which further leads to its erasure.

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Drill bits are sharpened on special grinding machines. At home, drills can be grinded on a simple grindstone with a stone, using a grinder with a nozzle, on a nazhdachke.
So, how to properly sharpen a drill bit for metal?
How to sharpen a drill, determines the shape of the rear plane of the drill.
The fact is that the sharpening of the drill is done on the back edges.
Warning! Correctly sharpened drill has two teeth, sharpened exactly the same. Speaking about the types of sharpening, we note that there are several of them.
The simplest, one-plane.
To perform a single-plane sharpening, the drill is attached to the sharp circle in parallel with the cutting part. During the grinding process, it is prohibited to move or rotate the drill bit.
This is the simplest kind of grinding. But it is recommended to use it for drills with a diameter of up to 3 mm. The biggest disadvantage of this kind of grinding is the destruction of the cutting edge of the drill in the process of work in the form of chipping.
The second common type of sharpening is called conical.
This type of grinding is used for drills with diameters in excess of 3 mm. This is a more complicated kind of grinding.
Conical sharpening of a drill is difficult to perform manually.
For its execution, it is necessary to take a drill in the left hand, holding the working part. The right hand clamps the shank.
The drill is pressed by the cutting edge to the end face of the grinding wheel at the desired angle.
Using the right hand to swivel the drill, create a tapered surface on the back edge of the drill bit.
Warning! Smooth and slow movements of the hand grind the drill bit, not tearing it from the surface of the stone.
Do the same for the second part of the drill bit.
Carefully follow the shape of the back edge and the angle of sharpening.
For accurate measurement of the sharpening angles, use a special device called a goniometer.
If there is no measuring instrument, you can make a template.
And what angles should be maintained, where to find out their magnitude.
The angle of the drill bit for metal is selected from the table.

Important! In the process, do not overheat the drill, overheating leads to a weakening of the steel. Be sure to do cooling and quenching with water.

To ensure the required angles of sharpening the drill, it is recommended to use special tools.
The tool allows you to sharpen the corners of the drill to withstand the requirements of the tables.

Methods for grinding drills at home, with your own hands

We have examined the sharpening of the drill with a grinding stone. And how to sharpen a drill?
If you do not have a grinding machine at your fingertips, you can get by with a Bulgarian.
Method 1
This method consists in the fact that the drill is rigidly fixed in a vice or attachment. The fixing angle is set.
A disk for work on metal is installed on the Bulgarian. Rotating disc is periodically fed to the drill plane.
And how to sharpen a drill with a Bulgarian, is well shown on the proposed video.
Attention! The proposed option is unsafe. It will be better and more reliable if you fix a drill in a device or a vice.

Method 2
With this grinding method, a bolgar is attached. A disc with fine sandpaper is installed on the Bulgarian.
The drill bit is held by the hand, is applied to the disc by the cutting part.
Everything is perfectly visible, how to sharpen a drill bit on metal Bulgarian on video.
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Rules for sharpening the winning drill bits

And how to sharpen a winning drill? The winning drill is most often used for drilling holes in concrete, brick, or stone.
The drill is heated during operation, producing a squealing sound. This is the first sign that the drill needs sharpening.
To sharpen a winning drill, it is better to use a grinder with a diamond disc. Warning! Try to maintain the angle of sharpening. For a winning drill, it is 170º.
Sharpening the winning drill is to trim the blunt cutting edge.

Working with abrasive

Smoothly touching the drill to the grinding stone, taper the front surface of the drill.
The drill is taken to the left hand closer to the cutting part, with the right hand held by the shank. The drill is fed to a grinding stone, a cutting disc of a Bulgarian or a mushroom with an installed emery cloth.
Sharpening is the correction of the cutting edge of the winning drill, which is blunted when drilling a hard surface.
Warning! It should be remembered that the frequency of rotation of the grinding stone depends on the hardness of the drill. The harder the material of the drill, the slower the disk should rotate.
In the process of sharpening it is necessary to monitor the uniformity of the cutting edges. Otherwise, you will get enlarged and uneven holes. It is important not to scrape the bit and cool it.

Conclusions:

- the drill can be sharpened correctly and at home by yourself;

- drills up to 3 mm are preferable to sharpen with a single-plane grinding;

- it is recommended to use conical sharpening for drills over 3 mm;

- for sharpening it is possible to use not only special equipment, but also a grinder with an emery nozzle;

- it is better to sharpen the winning drill on a sharpening machine with a diamond disk;

- Always use safety glasses when sharpening.