Sharpening the drill bit

In construction and repair often used tools such as a puncher, drills, screwdrivers. They have a drilling function, and sometimes you have to deal with the problem of how to properly sharpen a drill yourself, in order to extend the life of the drill. There are ways to sharpen spiral drills, which can be used at home, and for this it is not necessary to have a special machine.

Drills differ in the metal from which they are made and the angle of sharpening. By its structure, the drill must be harder than the material for which it is used. As an example, you can consider a drill, the simplest form - for working on metal. To grind it, an electric tool with a rotating grinding wheel is suitable. To ensure the safety of the process, the tool is tightly fastened to the workbench and wear special glasses for eye protection. Before you sharpen the drill, you need to take care of the presence of a nearby container with coolant, because when grinding it will heat up. To the metal drill does not lose its qualities from overheating, it must be cooled. The angle of sharpening the drill is the angle that is formed by the cutting edges when viewed from the side. Since the spiral drill has a conical ending, it has two cutting surfaces. Its rear plane is deployed at a certain angle. When sharpening, it is necessary to monitor the position of the drill bit. Its rear surface should lag behind the rotating washer at a distance of 0.2 millimeters, and along the entire radius.

If you need to sharpen a drill for metal or wood with the use of electric water, you should know that the process will take place in several stages. First, the back surface is formed at the drill, resulting in its ending having a conical shape. After this, it is necessary to form a cutting edge, while observing caution. After sharpening the drill, a jumper appears at its end. For drills with a diameter of up to seven millimeters, it should be equal to 0.5-0.7 millimeters. If the drill is larger diameter, then the jumper can be from one to one and a half millimeters. At the end, the final sharpening is carried out, as a result of which the rear corner of the drill is created. It directly depends on which metal the drill is made from.

The main difficulty of this method is the sharpening of a drill with mature corners. Experience comes with practice. It is recommended to use a protractor, on which you need to put one hundred and eighteen degrees. If the drill was sharpened correctly, then when it is drilled, it will release chips from both of its spiral grooves.

Much less often than drills in wood or metal, require additional processing of the drill for concrete. However, there are some peculiarities here. So, when sharpening a drill on a grinding stone during a strong overheating, it is not recommended to lower the drill in water, otherwise its plate may burst. It is better if it gradually cools down in the air. With the correct sharpening, the drill has straight cutting edges, and their intersection must coincide with the axis along which the drill rotates. If you do not follow these rules, the drill will be blunted faster and there is a risk of breakage.

When the drill is sharpened, the process is better controlled with the help of a washer. It should have a smaller diameter than the drill bit. When installing a drill in the hole of the washer, its leading edges should touch it, and the rear ones should be 0.2 millimeters behind. Some rules should be observed. For example, when grinding, you need to take maximum care not to damage the cutting surface of the drill. To do this, leave untouched 0.2-0.3 millimeters. With them, the metal is removed last.

After acquaintance with this material, you should not complicate the issue of how the sharpening of the drill is carried out, and what rules should be followed. Now you do not need to throw away the drill bit, as you can handle the problem on your own.