2023 Author: Philip Bishop | [email protected]. Last modified: 2023-08-25 07:54
- What is a drill and how to sharpen it
- We sharpen drills for metal work
- A few words about the sharpening machine
- Methods for sharpening drills with a grinder at home, with your own hands
- Rules for sharpening victorious drills
- Working with emery
In the household, the most popular power tool is the drill. Using a reliable assistant, you can not only drill almost any holes, but also cut out places for the installation of electrical devices, including sockets, switches.
But for this you will definitely need a set of drills. Drills are available to work with any material.
In the process, the drills become dull and need sharpening.
The material below tells you how to properly sharpen a drill for metal in addition to watch a video about sharpening options
What is a drill and how to sharpen it
For drilling work, special tools are produced, the most common of which is a drill.
Attention! For work with different materials, special drills with different sharpening angles are available.
In addition, the material structure affects the sharpening angles. But first things first.
A drill is a cutting tool that performs a cutting process due to a rotary motion with an axial feed.
Drills are used not only for making through holes of various diameters, but also for reaming existing holes. Using a drill, you can drill a through hole, make a recess of the desired diameter, drill to the required depth.
But to perform the listed work, you need a drill of the required diameter.
In addition, the drill must be properly sharpened.
And in order to find out how to sharpen a drill, it is necessary to clarify for which material the tool will be used.
Structurally, the drills are produced spiral, flat or feather, ring, center, for deep or one-sided cutting.
Twist 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 at great depths. Structurally, the cutting part is made in the form of a blade and is attached to the holder.
Annular drills are made in the form of a hollow tube, in which a narrow annular cutting part works.
Center drills are used to center parts when turning.
But all the listed tools become dull in the process. And since the drills are dull, they must be sharpened. And in order to find out how to sharpen the drill correctly, you need to imagine what material the tool will be used for and change the sharpening angle.
Drills are less likely to blunt when working on wood. If you only use drills in wood, then these drills do not require sharpening for several months or years. You just need to be careful about their storage and use.
For us, it is important to learn how to sharpen drills when working on metal and concrete.
We sharpen drills for metal work
In order to find out how to properly sharpen a drill for metal, just watch a video about the methods and angles of sharpening.
To make sharpening work, you need to have not only sharpening equipment, but also protective equipment.
Of the means of protection, it is imperative to purchase safety glasses.
And for sharpening a drill, it is best to buy a sharpening machine.
A few words about the sharpening machine
Most often the sharpening machine is made on the basis of a small 220 V AC electric motor.
The speed of the sharpening machine is from 1500 rpm.
The machine must be equipped without fail with a transparent protective screen, thrust bearing.
At home, you should not use drills with a diameter of more than 16 mm.
So how to properly sharpen a drill for metal if the drill is dull?
The fact that the drill needs sharpening can be judged by the characteristic squeak that appears during drilling, especially at the beginning. At the same time, the drill starts to get very hot, which even more leads to its wear.
Drills are sharpened on special sharpening machines. At home, drills can be sharpened on a simple sharpener with a stone, using a grinder with a nozzle, on sandpaper.
So how to sharpen a metal drill correctly?
How to sharpen the drill determines the shape of the back plane of the drill.
The fact is that the drill is sharpened along the back edges.
Attention! A properly 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 single-plane sharpening, the drill is placed parallel to the grinding wheel by the cutting part. Do not move or rotate the drill while sharpening.
This is the simplest type of sharpening. But it is recommended to use it for drills with a diameter of up to 3 mm. The biggest disadvantage of this type of sharpening is the destruction of the cutting edge of the drill during operation in the form of chipping.
The second common type of sharpening is called conical.
This type of sharpening is used for drills with a diameter of over 3 mm. This is a more complex type of sharpening.
Tapered drill sharpening is difficult by hand.
To perform it, you need to take the drill in your left hand, holding the working part. The shank is clamped with the right hand.
The drill is pressed by the cutting edge to the end of the grinding wheel at the desired angle.
Swinging the drill with your right hand, create a tapered surface on the back of the drill.
Attention! Sharpen the drill nib with smooth and slow movements of your hand without lifting it off the stone surface.
Perform the same steps for the second part of the drill.
Pay close attention to maintaining the shape of the back edge and sharpening angle.
To accurately measure the sharpening angles, use a special device called a protractor.
If there is no measuring device, you can make a template.
And what angles must be maintained, where to find out their value.
The angle of sharpening of the drill for metal is selected from the table.
Important! During work, do not overheat the drill, overheating leads to weakening of the steel. Be sure to do cooling and water quenching.
It is recommended to use special tools to ensure the required sharpening angles of the drill.
The device allows you to sharpen the corners of the drill, meeting the requirements of the tables.
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Methods for sharpening drills with a grinder at home, with your own hands
We looked at sharpening a drill with a grindstone. And how can you sharpen the drill yourself?
If you don't have a sharpening machine at hand, you can get by with a grinder.
This method consists in the fact that the drill is rigidly attached in a vice or fixture. Sets the anchoring angle.
A disc is installed on the grinder for working on metal. The rotating disc is periodically brought to the plane of the drill.
And how to sharpen a drill with a grinder is well shown in the proposed video.
Attention! The suggested option is unsafe. It will be better and more reliable if you fix the drill in a fixture or vise.
With this method of sharpening, a grinder is attached. A disc with fine sandpaper is installed on the grinder.
The drill is held by hand, applied to the disc by the cutting part.
Everything is perfectly visible how to sharpen a drill for metal with a grinder in the video.
Rules for sharpening victorious drills
How to sharpen a victorious drill? Pobeditovogo drill is most often used for drilling holes in concrete, brick, stone.
During operation, the drill heats up, making a squealing sound. This is the first sign that the drill needs sharpening.
Details on how to sharpen a victory drill for a hammer drill.
To sharpen a victorious drill, it is better to use a sharpener with a diamond disc. Attention! Try to maintain the sharpening angle. For a victorious drill, it is 170º.
Sharpening a victorious drill consists in correcting a blunt cutting edge.
Working with emery
Smoothly touch the drill to the sharpening stone to correct the front surface of the drill.
The drill is taken in the left hand closer to the cutting part, with the right hand holding the shank. The drill is fed to a sharpening stone, a grinder's cutting disc or a mushroom with an installed emery cloth.
Sharpening consists in correcting the cutting edge of a victorious drill, which becomes dull when drilling a hard surface.
Attention! It must be remembered that the speed of the grinding stone depends on the hardness of the drill. The harder the drill material, the slower the disc should rotate.
In the process of sharpening, it is necessary to ensure that the cutting edges are uniform. Otherwise, you will end up with enlarged and uneven holes. It is important not to overheat the drill and cool it down.
- the drill can be sharpened correctly and at home by yourself;
- it is preferable to sharpen drills up to 3 mm with a single-plane type of sharpening;
- for drills over 3 mm, it is recommended to use conical sharpening;
- for sharpening, you can use not only special equipment, but also a grinder with an emery nozzle;
- it is better to sharpen the victorious drill on a sharpening machine with a diamond disc;
- when sharpening, be sure to use protective glasses.
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