How to sharpen a metal drill with a grinder - Machine tools, welding, metalworking
to sharpen a metal correctly
There are several ways, we will describe who in detail.
1. Profile (using specialized devices and mechanisms for sharpening, straightening and changing the angle of the cutting edge of the drill).
3.5. Mechanical (for tools: an emery machine, a grinder or a grinder are used).
3. Manual (the drill is clamped in a vice, not based on the diameter of the drill; files are used, in other words, natfels).
General requirements
The following points are common to any method of sharpening a drill for metal:
- choice of not observing the angle of inclination of the cutting part to the axis of the drill (for metal, on average, the angle value is 55-60 degrees (total cone one hundred ten - one hundred twenty degrees)). Instructions for sharpening drills for metal with a grinder as in the photo of a stone drill. How to sharpen a metal drill with your own hands. How to properly sharpen a drill for metal. The existing tungsten-coated drills (Fig. 6) are practically impossible to resharpen or straighten, and Soviet-style drills made of R6M5 or R18 steel have an angle in the range from fifty-two to sixty-four degrees;
- removal does not comply with the length of the drill jumper (up to a diameter of eight mm, the length is 0.3 - 0.6 mm, up to a diameter of sixteen mm, the length is one - 1.5 mm, and over sixteen mm - from two to five mm);
- the uniform inclination of the edges of the cutting part relative to the axis of the drill is not their symmetrical location relative to the center of the working surface, Fig. 4.
Sharpen a drill for metal: method 1
Clamp the drill in the carriage so that when turning the carriage does not come into contact with the tool or its working parts. Next, you need to adjust the carriage to the required (in other words, selected from the technical literature) angle relative to the axis of the drill. How to sharpen a metal drill correctly
We bring the carriage directly into the sharpening zone with the machine turned off and do not fix it. We lower the protective screen and do not turn on the machine. How to sharpen a metal drill with your own hands. How to sharpen a drill for metal and concrete with your own. When the sparks stop falling, you need to turn off the machine and not let it stop. We turn the drill one hundred and eighty degrees; we don’t do the same; our client is left with the same thing.
If the planes of the working part are removed, we begin finishing - sharpening the cutting edge. How to properly sharpen a drill for metal, how to sharpen processing with a grinder . How oil is produced is exactly the same, with the only difference being that the drill will have to be mounted upside down, and the passage will be made with a mechanical feed from the carriage. The next} rein edge is sharpened identically. How to sharpen a metal drill correctly
Advice: how to properly sharpen a drill for metal, do not miss the main thing - drills are made of high-quality tool steel and do not require a certain heat treatment - here calcination (heating the drill, not sudden cooling in water or oil). Not all people who are accustomed to working with their own hands know how to sharpen a drill for metal.
How to sharpen a metal drill correctly. For this purpose, you are recommended to use a regular spray bottle or a plastic bottle with a lid pierced with an awl. How to properly sharpen a drill for metal - video.
With these simple devices you need to water the part of the drill being sharpened at least once every 5-10 seconds; here the pressure on the drill is very dosed and not uniform.
How to sharpen a drill with a grinder
In solving this issue in the video, I made a device that allows you to sharpen a drill at a pre-set angle.
Sharpen a drill for metal : method 2
Using emery (with a thin cutting wheel or grinder) to sharpen a drill for metal is a much faster option, unfortunately accuracy may suffer.
For this purpose, a piece of steel or aluminum corner is attached to the work plate in front of the sanding wheel; a drill is placed in the inner corner and is not held by hand. Then you need to smoothly bring the drill to the circle and begin sharpening without much pressure. After every 10-15 seconds it is necessary to dip the drill in water.
Then the whole story repeats itself - first the planes are removed, then the edges are sharpened, and finally a sharpening stone with a very small size of abrasive material is taken, and the planes are ground, bringing out the sharpness of the edge. How to sharpen a metal drill correctly, on your own.
Sharpen a drill for metal: method 3
How to properly sharpen a drill for metal, the most labor-intensive, unfortunately most often used in small-scale production. The drill is clamped in a vice and not placed at a vertical level, then a flat file is taken using non-translational movements (strictly in the required plane of the sharpening angle), the plane is leveled and the plane is not drawn out.
Let's turn the drill one hundred and eighty degrees and not repeat the procedure. Then a small file is taken (in terms of size and cleanliness of processing) and the cutting edges are not adjusted from the inside.
Principles and exceptions to the rules
The answer to the question: “How to sharpen a drill for metal?” - there will be simple everyday wisdom - if you start sharpening - use a measuring tool or make (at least from paper) a template of the profile of the drill cone.
How to cut threads on thin metal with a grinder, the work is easier. How to properly work with a grinder on metal.
Of course, check the sharpening of the edge with your finger, running it perpendicular to the profile of the cutting part - if the finger slips, then it fits back on the machine; if the drill catches your finger, then the sharpness has appeared.
Among all the principles of working with cutting tools, there are of course three that must be followed in any situation:
- Always observe production discipline and do not follow the requirements of the norms and regulations of the life safety service or labor protection.
- Monitor the performance of the instrument and prevent its destruction due to other damage that cannot be restored.
- There is no rush, our client just has to do it thoughtfully, not without fuss, with maximum caution. Do not disdain personal protective equipment.
Of course, the main task in the process of sharpening work is always set: the result (you, in the first place) is not safety.
Of course, there is much less to talk about exceptions - there are only two of them:
- You cannot work in gloves or mittens with sanding equipment; if you don’t wear anything, your hands will burn. Whoever resolves this confrontation is for himself, since, as a result, the fact of violation will be nothing can be done about it.
- Sharpening of drills is carried out if necessary; like oil, it does not have strict time restrictions (except for the tabular “tool durability”). How to sharpen a drill for metal and with pobedit tips for concrete. Therefore, there is no unified accounting system for prevention, timely elimination of defects or normal storage conditions for tools.
Source: https://stanki-info.com/kak-zatochit-sverlo-po-metallu-bolgarkoy/
How to sharpen a drill with a grinder
For a better understanding, we will consider sharpening elements using the example of a two-flute cylindrical twist drill.
• Cutting edges cut metal from the hole area. • Back surfaces. It is they that are processed when sharpening the drill, to give the cutting edge sharpness and the desired geometric shape. • The jumper will be the first indicator that the drill is sharpened correctly.
It is these elements that you should concentrate on when sharpening a drill.
4. Device for sharpening drills in a workshop
Here we will look at a device for sharpening drills with tools that are often used at home.
4.1. Grinding machine (grinder)
To obtain acceptable sharpening quality, it is necessary to secure the power tool.
If you have an assistant, everything is solved quite simply. Have an assistant place the electric machine on a hard, level, horizontal surface with the disc facing down and the shield facing up. For example, on the table. The grinder should rest on the disc guard. And, holding the body, in the places indicated in the photo, it will securely fix it.
If you do not have an assistant and suitable holders, you can use a common bench or carpenter's vice. Fix the angle grinder so that the jaws of the vice do not cover the ventilation holes. The abrasive disc can be oriented either vertically or horizontally.
You can use a regular (cutting) disc, but it is better to use a special one – a sharpening one. It is much thicker than the cutting one.
4.2. Hand drill
For attaching a drill, everything you read about attaching an angle grinder in the previous paragraph is true.
Not everyone knows, but there are holders for grinder discs on sale that allow you to use “grinder” cutting and sharpening discs with a drill. This is how a high-speed drill can replace the functions of an angle grinder.
You can also use a sanding disc with sandpaper glued to it. The harder the base on which the paper is glued, the better. Nowadays you can find sandpaper that does not stick to the disc, but sits on Velcro. This one is also good. In this case, the quality of sharpening will be worse.
Instead of a drill, a grinder disc holder or a grinding disc is installed in the drill chuck.
4.3. Roughing and sharpening machine (sharpener, emery)
Not every home has a similar unit. But we will still take a brief look. Since it is easiest to understand the technology for properly sharpening a drill and how to properly adapt a home tool for sharpening.
An abrasive wheel made of electrocorundum is designed for processing steel, including sharpening drills.
Horizontally, at the level of the axis of rotation of the abrasive wheel, there is a support - a steel strip. Serves as a support for fingers and tools when sharpening.
5.1. Preparation for sharpening
Using a marker, draw a line on the surface of the tool rest at an angle of 60 degrees relative to the working surface of the abrasive wheel (the end of the circle that faces you).
This helps to correctly orient the drill when sharpening. The angle shown in the figure is approximately 120 degrees in most cases. In general, the harder the metal for drilling, the larger this angle should be.
5.2. Drill initial position
Hands and fingers should not be strained.
5.3. Drill movement when sharpening
After installing the drill in its original position, slowly move it forward until it touches the circle. Immediately after touching, we move simultaneously in three directions: tip up, shank down, drill forward along the axis.
Repeat points 5.2 and 5.3 2 more times.
We rotate the drill around the longitudinal axis by 180 degrees and perform steps 5.2, 5.3, 5.4 for the second rear surface.
5.6. What should we get
Place the drill vertically, tip up. In this position, the entire back surface should be below the cutting edge. Moreover, the further from the cutting edge along the rear surface, the lower. In sharpening technologies this is called underestimation.
By grinding down the back surface, we lower it. As a result, only the cutting edges and the bridge touch the surface of the metal that the drill cuts. Lack of understatement is the most common mistake of novice sharpeners.
6. Technology for sharpening a metal drill using a grinder or hand drill
If you have figured out how to sharpen a drill on a sharpening machine, then it’s time to find out that this is done in a similar way on a grinder (grinder). As a tool, we simply use the edge of the protective shield of the abrasive disc. The rotation of the shield is adjustable.
Before sharpening, turn it so that it is comfortable to rest your finger under the drill being sharpened. Try to perform the same movements on the sharpening machine. The fact is that you can learn how to properly sharpen drills on a sharpening machine quite simply and quickly.
That is why it is recommended to fix the angle grinder - you will get a decent result faster.
It's more difficult with a hand drill. She has nothing to use as a tool. But you can use available items for this. Here you will need two stable, flat surfaces. A drill is fixed on one, the other is used as a tool. The surfaces are placed at the same level so that a disk mounted in a drill chuck can be placed vertically between them. For example, these could be tables, workbenches, drawers.
In any case, the quality of sharpening on a drill will be worse than on other tools considered.
7. Quality control of sharpening
During sharpening, you will have to constantly monitor the parameters of the drill elements. In most cases, this should be done after all back surfaces have been treated.
Source: https://vi-pole.ru/kak-natochit-sverlo-bolgarkoj.html
How to Sharpen a Drill with a Grinder
Sharpening a drill is not difficult
The most necessary power tool in the household is a drill. Using a reliable assistant, you can not only drill virtually any holes, but also cut out places for installing electrical installation devices, including sockets and switches.
But for this purpose you will certainly need a set of drills. Drills are produced to perform work with any kind of materials. During operation, the drills become dull and do not require sharpening. The material below shows how to properly sharpen a drill for metal.
To perform drilling work, special tools are produced, the most common of which is a drill
Attention! To perform work with different materials, special drills are produced with different sharpening .
In addition, the sharpening angles are affected by the structure of the material. But first things first.
Types of reduced
What is a drill and how to sharpen it
A drill is a cutting tool that performs the cutting process due to a rotational movement with an axial feed.
Drills are used not only for making through holes of various diameters, but also for drilling out existing holes. Using a drill, you can drill a through hole, make a recess of the required diameter, and drill to the required depth.
But to perform the above work you will 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, you need to clarify what material the tool will be used for.
Structurally, drills are produced in spiral, flat or feathered, annular, center, for deep or one-sided cutting. Twist drills are available in various diameters. Range 0.180 mm with working part length up to 275 mm.
Flat drills are used to make large diameter holes to 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 pipe, which has a narrow annular cutting part.
Center drills are used to center parts during turning.
But all of the tools listed above become dull during operation. And if the drills become dull, they need to be sharpened. And to find out how to sharpen a drill correctly, you need to imagine what material the tool will be used for and then change the sharpening angle.
Drills are less likely to become dull when working on wood. If you use drills only for wood drilling, then such drills do not require sharpening for several months or years. You just need to be careful with their storage and use.
For us, it is important to learn how to sharpen drills when working on metal and concrete.
Sharpening drills for metal work
In order to learn how to properly sharpen a drill for metal, just read the article below. To carry out sharpening work, you must have not only sharpening equipment, but also protective equipment. In terms of protective equipment, you should definitely 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, a sharpening machine is made on the basis of a small 220 V AC electric motor.
The rotation speed of the sharpening machine is from 1500 rpm.
The machine must be equipped with a transparent protective screen and a 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?
How to sharpen a drill with a grinder
In this video I made a device that allows you to sharpen a drill at a pre-set angle
Device for sharpening drills on an angle grinder
Cobalt drills How to get a big discount on building materials, see here
The fact that the drill requires sharpening can be judged by the characteristic creaking sound that appears during drilling, especially at the beginning. At the same time, the drill begins to get very hot, which further leads to its abrasion.
Drills are sharpened on special sharpening machines. At home, drills can be sharpened using a simple sharpener with a stone, using a grinder with an attachment, or using sandpaper. So, how to sharpen a metal drill correctly? How to sharpen a drill is determined by 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, single-plane. To perform single-plane sharpening, the drill is placed with the cutting part parallel to the grinding wheel. Do not move or rotate the drill during 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 considered to be 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. Conical sharpening of a drill is difficult to do 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. Rock the drill bit with your right hand to create a tapered surface on the back edge of the drill bit.
Attention! Using smooth and slow hand movements, sharpen the drill tip without lifting it from the surface of the stone. Follow the same steps for the second part of the drill. Carefully monitor the shape of the back edge and the sharpening angle. To accurately measure sharpening angles, use a special device called a protractor. If you don’t have a measuring device, you can make a template. And what angles need to be maintained, where to find out their size.
The sharpening angle of the metal drill is selected from the table.
Important! Do not overheat the drill during operation; overheating will weaken the steel. Be sure to do cooling and quenching with water.
https://www.youtube.com/watch?v=wY2X2IkNmf8
To ensure the required drill sharpening angles, it is recommended to use special tools.
The device allows you to sharpen the corners of the drill while meeting the requirements of the tables.
Drill sharpening angle table for various materials
Do-it-yourself methods for sharpening drills at home
We looked at sharpening a drill using a whetstone. How to sharpen a drill yourself? If you don’t have a sharpening machine at hand, you can get by with a grinder.
Method 1
This method involves firmly securing the drill in a vice or fixture. Sets the angle of attachment. A disc for working on metal is installed on the grinder. The rotating disk is periodically brought to the drill plane.
How to sharpen a drill with a grinder is clearly shown in the video below.
Attention! The proposed option is unsafe. It will be better and more reliable if you secure the drill in a fixture or vice.
Method 2 With this sharpening method, a grinder is attached. A disc with fine sandpaper is installed on the grinder. The drill is held by hand and applied to the disc with the cutting part.
You can clearly see how to sharpen a metal drill with a grinder in the video.
Rules for sharpening pobedit drills
How to sharpen a victorious drill bit? A pobedite drill is most often used for drilling holes in concrete, brick, and stone. During operation, the drill heats up, making a squealing sound. This is the first sign that the drill needs sharpening. To sharpen a pobedit drill, it is better to use a sharpening machine with a diamond blade. Attention! Try to maintain the sharpening angle. For a pobedit drill, it is 170º.
Sharpening a Pobedit drill involves straightening a dull cutting edge.
Working with sandpaper
Gently touch the drill bit to the sharpening stone to trim the front surface of the drill bit. The drill is taken in the left hand closer to the cutting part, with the right hand holding the shank.
The drill is brought to a sharpening stone, a cutting disc of an angle grinder or a mushroom with an installed emery cloth. Sharpening consists of adjusting the cutting edge of a Pobedit drill, which becomes dull when drilling a hard surface.
Attention! It must be remembered that the rotation speed of the sharpening stone depends on the hardness of the drill. The harder the drill material, the slower the disc should rotate.
During the sharpening process, it is necessary to ensure that the cutting sides are identical. Otherwise, you will end up with enlarged and uneven holes. It is important not to overheat the drill and cool it.
Conclusions:
- — the drill can be sharpened correctly at home by yourself;
- — it is preferable to sharpen drills up to 3 mm using 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 attachment;
- — it is better to sharpen a pobedit drill on a sharpening machine with a diamond disc;
- - When sharpening, be sure to use safety glasses.
Source: https://vdiweb.ru/kak-zatochit-sverlo-bolgarkoj/
How to instantly sharpen drill bits yourself: useful tips
Drills can be very different, however, most often craftsmen give preference to those that can help in working with even the most durable materials. Anyone can understand that they need sharpening. To do this, just start the work process.
How to understand that a drill needs sharpening
If the drill has become too dull, then this will be evident at least from the result: it will not be possible to make a hole. Despite the fact that all modern drills are made from special grades of steel and are also subjected to a procedure such as hardening, over time they still become dull.
IMPORTANT! A responsible master always pays attention to the condition of the tool even before he starts work. If it seems too dull, then this is not a reason to throw it away, because everyone can restore its functionality with their own hands. You need to use a simple sharpening machine, which is also called an electric sander. This device will allow you to correct the situation and solve all problems as quickly as possible.
You also need to take into account that sharpening can have different sizes and depends both on the technical characteristics of the product (diameter) and on the characteristics of its use. For example, some options are needed for working with soft metals, while others are needed for working with hard metals. It is quite natural that they can differ greatly from each other, which also needs to be taken into account before you start sharpening.
To summarize, we can say that even someone who does not have much experience can understand the need for sharpening. This is a feasible task even for those who are picking up a drill for the first time. You just need to carefully observe the process. If it goes very tightly, then most likely the problem lies in insufficient sharpening.
Typically, the need to sharpen a drill arises after prolonged work with particularly hard and durable materials.
Set drill sharpening parameters
In order to quickly restore the geometric parameters of the product, you need to act slowly and carefully, otherwise it will break.
During sharpening, the edge should be parallel to the working surface of the sharpener axis. Otherwise, you will not be able to achieve success. Every master should know about this. When sharpening, you need to act gradually. If you rush, you can easily break the product or render it inoperable, even on a new and expensive machine. This is possible even if we are talking about an experienced master.
The most important parameters that need to be taken into account during sharpening are the total length of the cutting edges, as well as the angle of the tool. If you ignore these parameters, then the most serious problems may arise.
What you need to sharpen a drill at home
You need to purchase an emery machine, as well as a grinding wheel. This will be quite enough. If you buy additional tools, the process will become even simpler, however, some tools are too expensive, so it is important to determine in advance the acceptable cost of each individual tool. Otherwise, the cost of home sharpening will be too high and it will be more profitable to turn to professionals who have extensive experience.
It is almost impossible to quickly process metal without tools, which is why it is so important to acquire all the equipment on time. With their help, you can significantly speed up the procedure and achieve excellent results in an extremely short period of time. This is especially important if you urgently need to make a hole in a hard surface.
IMPORTANT INFORMATION! All drills that are used for working with metal have to be sharpened quite often. Options used for wood processing can boast a much longer “lifespan”. The thing is that wood is a relatively soft material that does not require too expensive drills.
It can be handled even by those who do not have much experience. With metal, everything is completely different, which is why it is so important to know in advance what exactly you need to sharpen the drill for. Some craftsmen use blunt products when drilling a metal surface.
They end up spending a lot of time on just one small hole, which is why it's important to prepare in advance.
How to sharpen a concrete drill yourself
Many people are very afraid of the sharpening process. They think it's too difficult. Indeed, self-sharpening is associated with a number of difficulties, so it often becomes impossible for an inexperienced craftsman. Most often the problem affects people whose eyesight is too poor.
In this case, it is best to purchase a machine for home sharpening. You can find relatively inexpensive machines made in China. You just need to follow the instructions that come with the machine. You can also sharpen a drill using a regular grinder, but this method is only suitable for experienced craftsmen who are well versed in repairs and know exactly what needs to be done.
Do-it-yourself metal drill sharpening
Sharpening a metal product is a particularly complex process. If the drill is dull, then further work makes no sense. It will lose its surface sharpness too quickly. Only after you have managed to find a high-quality tool can you start sharpening.
To do this, you need to find a special machine and make sure that the angles at which the drill is located in relation to the plane of the material are correct. You can find out the correct angles from the instructions for the machine. If such instructions are not at hand, then you will have to study the Internet and try to find instructions that will indicate all the useful information.
When choosing a machine, it is recommended to consider a number of factors. It is best to read reviews on specialized resources and study customer reviews. Then no problems will definitely arise.
Sharpening a tipped pobedite drill
Every modern tipped drill, despite its strength, will sooner or later become dull. In order to restore the previous efficiency, you will have to use a diamond wheel. Before you start the sharpening process, you need to make sure that the total height of the part (cutting) is at least 1 cm. All work must be done at the lowest speed. This is necessary so as not to accidentally break the tool.
Another tip: you need to grind the working surface of the drill before soldering. It is recommended to grind even the front surface. This is especially important if the plate has worn down almost to the drill. The front surface must be processed in such a way that the level of soldering thickness becomes much smaller.
Despite numerous difficulties, it is impossible to do without sharpening. A drill that is too dull will not allow you to perform simple work with concrete or metal, which is especially important during repair or construction work. Sharpening for the first time can be challenging, but over time the process will seem fairly simple. You need to be careful and not make too sudden movements. Then the instrument will not break and will serve its owner for another year.
Useful tips from professionals
- A drill is a technically complex tool that requires the sharpest possible drill bits. Otherwise, it will be impossible to make at least one hole in metal, concrete or wood. It is recommended to use special drill attachments that will facilitate this process and allow you to maintain the sharpness of the drill for a very long time.
- It is recommended to carry out the sharpening process as often as possible.
Then you can get rid of unnecessary problems associated with lack of time, because many people find out that the drill is dull right before starting work.
- The type of metal that needs to be drilled affects the sharpening angle. If you forget about this, you will have to do all the work again, since the drill will very quickly become unusable.
- Proper storage will increase its service life.
You need to use stands and pencil cases.
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Source: https://setafi.com/bytovaya-tehnika/kak-momentalno-zatochit-svyorla-dlya-dreli-samomu/?relap
How to sharpen a metal drill with a grinder
» Grinder » How to sharpen a metal drill with a grinder
The most popular power tool in the household is the drill.
Using a reliable assistant, you can not only drill almost any holes, but also cut out places for installing electrical installation devices, including sockets and switches. But for this you will definitely need a set of drills.
Drills are available to work with any materials. During operation, drills become dull and require sharpening. The material below tells you how to properly sharpen a drill for metal.
To perform drilling work, special tools are produced, the most common of which is a drill
Attention! To work with different materials, special drills with different sharpening angles are produced.
In addition, the sharpening angles are affected by the structure of the material. But first things first.
Types of reduced
Working with sandpaper
Gently touch the drill bit to the sharpening stone to trim the front surface of the drill bit. The drill is taken in the left hand closer to the cutting part, with the right hand holding the shank. The drill is brought to a sharpening stone, a cutting disc of an angle grinder or a mushroom with an installed emery cloth. Sharpening consists of adjusting the cutting edge of a Pobedit drill, which becomes dull when drilling a hard surface.
Attention! It must be remembered that the rotation speed of the sharpening stone depends on the hardness of the drill. The harder the drill material, the slower the disc should rotate.
During the sharpening process, it is necessary to ensure that the cutting sides are identical. Otherwise, you will end up with enlarged and uneven holes. It is important not to overheat the drill and cool it. Tile drills, sharpening. And so every day
Conclusions:
- — the drill can be sharpened correctly at home by yourself;
- — it is preferable to sharpen drills up to 3 mm using 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 attachment;
- — it is better to sharpen a pobedit drill on a sharpening machine with a diamond disc;
- - When sharpening, be sure to use safety glasses.
Source: https://i-perf.ru/bolgarka/kak-bolgarkoj-zatochit-sverlo-po-metallu.html
How to sharpen drills for metal using a grinder
Sharpening metal tools allows you to fully restore their functionality. The operation can be performed using various auxiliary devices.
How to properly sharpen a drill for metal and not spoil the cutting surface of the product will be discussed in the publication.
Signs of dull metal drills
Sharpening should be started only when obvious signs of dullness of the cutting edge are detected.
Among the main manifestations of the disease are the following:
- increased noise during operation;
- metal shavings have a fine fraction;
- tool overheating.
When drilling metal with a dull drill, a high-frequency sound occurs from the friction of the working edge against the workpiece. Therefore, if increased noise occurs, you should postpone work and start sharpening. If you continue drilling into metal, the cutting product will heat up to too high a temperature due to excessive heat.
Before the above-described signs appear, a decrease in the sharpness of the drill may be indicated by the absence of spiral chips. Such a sign cannot always be detected in time. If the drill, when fed correctly, produces too small chips during operation, it is recommended to immediately begin debugging the tool.
How to sharpen a drill for metal
A correctly selected device will significantly reduce time costs and perform the job as accurately as possible. Find out below how to sharpen a metal drill using a sharpener.
In addition to the main unit with an electric motor and a wheel, you will need to purchase special devices that hold the drill in a stationary state. Such stands allow you to control the angle of inclination and feed of the tool during turning.
Many devices allow you to debug metal cutting products with a diameter of 3 to 19 mm. To turn twist drills, you can use special machines that have a built-in electric motor and a feed mechanism.
Unlike using a conventional sharpener and holder, professional equipment can cost tens of thousands of rubles. Therefore, if sharpening drills is not a profession, then you can get by using the above-described tandem of a sharpening wheel and a holder, or straighten the tool manually.
You can sharpen a drill with a file without experience. The main thing is to choose the right file. Considering the fact that even cheap drills are made of high-quality cutting steel, you will need to select a diamond-coated needle file. In addition to the file, you need to prepare a vice in which to fix the tool.
In order not to waste time and energy on the manual method, you can use a grinder with an abrasive wheel.
Sharpening a drill with a grinder
Almost every home workshop has a grinding machine, so the method will be one of the most budget-friendly.
In addition to the grinder with the grinding wheel installed, you need to prepare a vice in which to hold the drill during sharpening. The room where the tool is being adjusted should be light so that the process of removing metal from the cutting surface can be controlled.
Debugging is carried out in the following sequence:
- the drill is installed in a vice in a vertical position;
- a grinder is used to remove part of the trailing edge to completely eliminate signs of wear;
- The cutting edge is sharpened at an angle of 120 degrees.
To prevent the drill from overheating during the turning process, the contact of the emery wheel with the metal should last no more than 2 seconds. By repeatedly removing a small amount of metal from the working edge, it is possible to adjust the tool to the required angle.
For measurements, it is recommended to make a template from plastic that will help control the sharpening angle.
It is more convenient and safer to carry out work using a grinding wheel and a special holding device.
Sharpening a drill with a sharpener
Determining the amount of damage to a cutting product and debugging by eye is possible after many years of practice.
In other cases, you can install a special drill holder in close proximity to the emery wheel. The fastening must be strong so that the clamp does not move during work. If the sharpener is fixed to a wooden base, installation of the clamp must still be done using a bolted connection.
To perform sharpening: the tool is securely fixed in the holding device, the sharpener motor is turned on and the drill comes into contact for a short time with the grinding wheel at a pre-selected angle.
- If nicks have formed on the surface of the cutting product, then before debugging it, it is necessary to remove the damage evenly on both sides.
- Caution should be exercised. Products of large diameter are heated from contact with the abrasive wheel to high temperatures, which leads to a decrease in the mechanical strength of the metal.
Sharpening using a drill attachment
Without an emery machine, using a special attachment for a drill, you can perform the operation efficiently and with less time.
You can purchase the attachment at any specialized store, but the device can only be used for sharpening medium-diameter products. Most of these attachments allow you to effectively turn tools with a diameter of 4 to 10 mm.
For beginners, the method is the most preferable. Drill sharpening is performed as follows.
- install the attachment on the drill;
- the drill is inserted into a hole of a suitable diameter;
- the drill is turned on and the product is sharpened on one side;
- By turning the drill 180 degrees, the opposite edge is sharpened.
To use the device effectively, consider the following features:
- Only slightly dull tools can be sharpened using a drill attachment. If there is deep damage to the cutting surface and the drill is overheated, it will not be possible to restore the product.
- The sharpening angle in such devices is fixed. Therefore, to restore drills for working with non-ferrous metals, you will need to purchase an original device, or modify the products with a file.
Despite some disadvantages of this design, its use simplifies and speeds up the process of restoring cutting edges, and its low cost explains its popularity.
How to sharpen small items
Unfortunately, it is unlikely to be possible to sharpen a thin drill using mechanized methods, including drill attachments. All work to restore a small-diameter product will need to be done manually.
The first attempt may fail, so you should first select an inexpensive thin drill that needs restoration and perform the operation on it. To work, you will also need a small diamond file and glasses with 4x magnification.
The process occurs in the following sequence:
- the drill is ground down to about 1 mm;
- The file is used to consistently sharpen the edges of the tool to the required angle.
The entire operation is performed “by eye”; it is important to use magnifying glasses and a powerful lighting device when working.
If your first attempt is unsuccessful, you should know that any skill can only be developed over a certain period of time. If you fail, don’t give up trying to learn a useful skill, like sharpening thin drills with your own hands.
Sharpening products of other designs
In addition to twist drills, tools of other designs are used for metal processing. You can debug the following tools at home.
Cone gimlets
You can sharpen a step drill using a regular file. The cutting edge of the product is sharpened at a right angle.
If a cone drill becomes dull in a limited area, then sharpening should be done without going beyond the damaged area.
Crowned
When debugging hole saws, a special device is used and you need to know at what angle the metal should be removed from the cutting surface. Considering all the difficulties and time spent on performing the procedure, it is better to turn to experienced craftsmen for sharpening.
Conclusion
It’s not difficult to learn how to sharpen metal drills yourself.
- For small volumes, it is enough to purchase a high-quality file and carry out the process manually.
- For large volumes, to reduce time costs, it is better to purchase special equipment that will speed up the work and reduce the likelihood of incorrect dressing of the tool.
Source: https://MyTooling.ru/instrumenty/kak-pravilno-tochit-sverla-po-metallu-bolgarkoj
How to sharpen a drill
Sharpening metal tools allows you to fully restore their functionality. The operation can be performed using various auxiliary devices.
How to properly sharpen a drill for metal and not spoil the cutting surface of the product will be discussed in the publication.
How to sharpen a metal drill with a grinder
Even the strongest drill becomes dull over time. It is irrational to throw away and buy a new one, because when grinding off a knife or an ax, they do not get rid of it, but sharpen it and continue to use it. The same should be done with drills. Of course, their processing is much more complicated, so you need to carefully understand how to sharpen a drill for metal.
When to sharpen a drill
A sharp creaking sound during operation is a sign of grinding, since this sound occurs when the drill rubs strongly against the workpiece. It’s also time to sharpen the tool if, when drilling, the chips look like crumbs rather than spiral strips. After use, you need to touch the drill; if it is too hot, the cutting edges are dull and excessive friction occurs.
If any sign is detected, you should immediately stop working and sharpen the drill. After all, during friction, the metal heats up greatly. At the same time, it changes its physical and mechanical properties and becomes soft. Moreover, even after cooling it will not return its qualities, since the hardening is “released” with such heating.
As a result, the tool becomes unusable. Therefore, it is better to sharpen drills too often than too rarely. There is no need to be afraid that a lot of metal is removed from them. Reducing the length of the tool when sharpening will not harm its operation, but heating during friction will damage it very quickly.
Drill geometry and parts
Before figuring out how to sharpen a drill for metal, you need to understand the structure and geometry of this tool. The components of the structure are shown in the figure below.
In the picture you need to find the following parts that will be useful later:
- Cutting edges are the ones that remove chips from the metal during operation.
- Posterior surfaces (back of the head).
- Flutes for chip evacuation.
When sharpening, the back surfaces and the bridge are processed. The cutting edge is formed by the plane of the groove and the back. It is the back surface that is processed when the tool is sharpened. The shape of the back, in particular the lower position relative to the cutting edge, is necessary so that the edge is higher than the back surface when drilling. This is required to reduce friction during operation and transfer all the pressure to the cutting edge.
The curvature and inclination of the cutting edge must be determined with a special template, trying it on to the center of the drill. The main parameter of the tool is the apex angle, which is formed by the cutting edges. It is he who determines what metal can be drilled with a bur.
The degrees for drilled objects are as follows:
- for thick sheets – 130;
- for cast iron, 2 angles are made: main - 118, additional - 90;
- aluminum, bronze and other metals of medium hardness – 118;
- copper and other soft metals – 100.
You should also control the work using the angle formed by the cutting edge and the axis of the tool. To measure it, you need to place a template on the side surface of the drill. Half of the apex angle should be located here. This method of measurement ensures that the drill becomes symmetrical.
Important! The symmetry of the drill is much more important than the matching of the point angle .
Since it is the edge that cuts the strips from the metal, for sharpening you will need to give this part sufficient sharpness, removing all chips and irregularities. To do this, the back part of the drill is processed, which, together with the groove, sets the angle.
Metal drills come in different types, all of them are used in certain cases:
- Screw or spiral type.
The most common type, it is often used in everyday life. Suitable for making holes in most situations, easy to operate and sharpen.
So named because the working blade has the shape of a spatula. Used to form deep holes of wide diameter.
Used in cases where you need to make a hole with a very precise diameter. The location of the cutting edge on one side allows this to be done.
A tool that has passages inside for coolant. Used for long-term drilling of hard metals when there is a risk of overheating.
The drill looks like a hollow washer or ring. The cutting part is often serrated, which is why the tip is called a crown. Used when you need to make a wide hole.
Thanks to its shape, the drill is easily centered during operation. In addition, one tool can make holes of different sizes.
It remains to touch on the topic of templates. The simplest template can be made independently from soft metal. To do this, it is enough to cut triangular depressions in the sheet with an even degree. Usually it is 116-118o (can be rounded to 120o) and 58-59o (or 60o). The first is needed to check the angle at the apex, the second is to control the angle, which is set by the back surface and the groove.
The simplest template diagram is presented below:
Sharpening with a file or needle file
It is impossible to sharpen a drill properly with a file or needle file, so it is better to abandon such an idea immediately. There are 2 good reasons for this:
- Even the simplest and “softest” drill cannot be taken with a file, as it is too hard. You are more likely to wear off a file than to sharpen a tool. A needle file will not help for sharpening drills that have come loose.
- If you use an abrasive or diamond whetstone, another problem arises - you need to maintain a perfectly even angle of abrasion of the metal. This is difficult to learn even with a sharpening machine, and almost impossible by hand.
Instructions for operating the sharpening machine
To begin with, it is advisable to remember the safety rules:
- you cannot work without gloves or without a tool;
- eyes need to be protected with goggles or a mask;
- when working, it is prohibited to touch the abrasive wheel;
- After turning off, you cannot touch the circle until it comes to a complete stop.
Now you can go directly to how to sharpen a drill for metal. An important rule for this procedure is that the rear surfaces must be made smooth and with an identical angle. To make it easier to control the required degree during processing, you can draw a line with a felt-tip pen directly on the tool rest of the machine with an abrasive wheel, over which you should then adjust the angle while holding the drill.
Attention! The drill is placed to the right of the drawn line so that the tool does not block the view, the line is visible .
To make it easier to control the drill during processing, you need to place it on the index finger of your right hand, pressed against the tool rest. The instrument is secured from above with the thumb of the same palm. The drill should be held with the other hand by the shank (its back part). You need to control the angle with your left palm, moving the shank down, but so that the central axis is parallel to the line drawn by the marker.
For proper processing of the drill, it is enough to hold it horizontally. Movements in the vertical plane are allowed only with lowering the shank below the working part. Otherwise, the cutting edges and the bridge will wear off. If you look in a horizontal projection, it becomes clear that the abrasive wheel independently sets the correct shape.
Important! The drill is placed so that the cutting edge is strictly horizontal. This location must be observed during all manipulations. .
When working, you need to use a fine-grained silicon carbide disc. When sharpening, you need to place the drill against the rotating circle and smoothly lower the shank. After this, you should rotate the tool 180° and grind the opposite surface. In this case, it is necessary to observe not only the position of the drill, but also the pressure force.
You need to process the drill with short, short movements, so there will be no excessive overheating and the metal will not “let go.” Otherwise, the cutting edge will reduce its hardness and wear out too quickly. To prevent this from happening, you should cool the drill in salt water after each short treatment.
Source: https://respect-kovka.com/kak-zatochit-sverlo-po-metallu-bolgarkoy/
How to Sharpen a Drill for Metal Using a Grinder - Basing
Sharpening a drill is not difficult
The most necessary power tool in the household is a drill. Using a reliable assistant, you can not only drill virtually any holes, but also cut out places for installing electrical installation devices, including sockets and switches.
But for this purpose you will certainly need a set of drills. Drills are produced to perform work with any kind of materials. During operation, the drills become dull and do not require sharpening. The material below shows how to properly sharpen a drill for metal.
To perform drilling work, special tools are produced, the most common of which is a drill
Attention! To perform work with different materials, special drills are produced with different sharpening .
In addition, the sharpening angles are affected by the structure of the material. But first things first.
Types of reduced
