How can you drill a drill - Metals and their processing

An easy way to remove a broken drill bit from a blind hole

Drill breakage while working with wooden and metal parts occurs quite often. If the hole is through, counter drilling and knocking out are used to remove the fragment. It is much more difficult to remove a piece of drill from a blind hole, especially if the part cannot be damaged. Read about what you can do in such a situation in the material below.

The most common causes of drill breakage

As practice shows, the most common reasons for a drill breaking off during operation are the following:

Incorrect drilling mode selected. It is necessary to correctly select the rotation speed and pressure on the tool.
The material of the part does not match the material of the drill. For example, if, when processing a metal part, you take a drill designed for working with wood, it will certainly break.
Lack of sharpening of the cutting edge for a long time. The condition of the tool must be monitored and corrected from time to time using a special machine.
Edge chipping. This usually occurs when drilling at high speed, especially if the drill is already dull.
Lack of proper cooling. When drilling, the metal heats up and its strength decreases. Even when using carbide drills, it is necessary to use cutting fluids.

Drills that are dipped in a jar of cold water to cool often break. If you don’t have normal coolant at hand, experienced craftsmen advise preparing a substitute:

“To make drills last longer, you need to make an emulsion for them from water, soap and machine oil. Dissolve 200 grams of laundry soap in a bucket of water, pour in 5 tablespoons of machine oil and boil everything until a homogeneous mixture is obtained.”

Andrey Vasilchenkov, mechanic

Depending on the material of the part that is being drilled, you can use a mixture of castor oil and technical petroleum jelly, castor oil and kerosene, turpentine diluted with alcohol, etc. These mixtures will not completely replace a good cutting fluid, but will still preserve drill bits better than water.

Poor condition of the cutting edge and incorrect drilling technique most often cause the drill to break off inside the part. For prevention, it is necessary to monitor sharpening and properly cool drills.

Removing the fragment with pliers or tweezers

The simplest option is when the drill breaks directly at the surface of the part or even above it, and there remains at least a small protruding tip that you can grab onto. In this case, you can remove the fragment with pliers.

“The most convenient way to grab the tip of the drill is not with ordinary pliers, but with so-called long-nose pliers or thin-nose pliers. Their serrated clamping part is narrow enough for the jaws to fit between the threads of the drill and securely fix them.”

Yuri Kolchin, home master

The jaws of the tool need to be inserted into the hole and grabbed onto the screw groove of the fragment. Then you need to unscrew the drill in a counterclockwise direction.

If the drill is very thin, the same can be done with tweezers. Corrugated tweezers for electrical work are best suited for this purpose.

Removing the fragment using two screwdrivers

A more complex case is when the drill breaks below the surface of the part, inside its body. It is impossible to hook the edge with pliers in such a situation. Therefore, you will need a device consisting of two thin screwdrivers:

both screwdrivers are alternately inserted into the hole along the screw grooves until they stop, as if grasping the fragment on both sides;
The screwdriver handles are held tightly by hand;
Using counterclockwise movements, the fragment is removed from the part.

At its core, this is an imitation of the option of removing a fragment with pliers. It is suitable if the drill bit sits loosely enough in the hole and is not jammed in it or bent.

If the fragment is difficult to give in and there is not enough hand strength to fix it well with screwdrivers, you need to press the rods with pliers or pliers with your other hand.

Easy method No. 1: removing the fragment using an electrode

If you have a welding machine and thin electrodes at hand, you can use the welding sticking effect to remove deeply embedded drill bits.

Welding sticking is the phenomenon of electrode sticking to metal during welding. Usually it causes a lot of trouble for welders, but in this case it can serve a good purpose.

Electrodes begin to stick to the metal when their surface has high humidity. Therefore, to get the desired effect, you need to wipe the electrode with a slightly damp cloth. But since in this case it can stick not only to the drill bit, but also to the walls of the hole, it is necessary to wrap the electrode with electrical tape almost to the entire depth of the hole. Only the very tip should remain free.

Next you need to proceed like this:

immerse the electrode in the hole so that its tip rests on the drill bit;
turn on the welding machine.

After the sticking effect is achieved, the device is turned off and the electrode is released from the clamp. Now, by pulling it, you can remove the drill from the part.

This method of removing debris is one of the easiest, but has a drawback. If you do the work carelessly and allow the electrode to stick to the walls of the hole, the situation can only worsen.

Easy method No. 2: etching the fragment with nitric acid

There are situations when a piece of a drill gets stuck tightly in a hole, and it is impossible to remove it using the listed methods. In such particularly difficult cases, nitric acid can help.

Concentrated nitric acid reacts vigorously with many metals, causing rapid corrosion and destruction. The exception is aluminum. The alloys from which drills are made do not have such resistance to the action of nitric acid. This property is used if you need to easily remove a stuck piece from an aluminum part.

To carry out the reaction, you will need the following tools and materials:

Nitric acid;
a piece of ordinary plasticine;
some thin tool for cleaning the hole.

Using any suitable tool, they try to remove as much aluminum shavings as possible from the hole, which can clog the screw groove of the drill and prevent acid from passing deeper.

Then something between a cup and a funnel is molded from plasticine, which will hold the acid over the hole and prevent it from spreading.

A plasticine cup is fixed over the hole with the stuck drill. Acid is poured into it. The part is left for several hours.

“In this way I was able to get a broken piece that I couldn’t loosen and pull out with pliers. Literally overnight, the nitrogen ate up almost the entire drill; there were pieces left that I simply shook out. The aluminum remained absolutely intact and was not damaged at all.”

Yuri Kolchin, home master

An indicator that the reaction is active is bubbles on the surface of nitric acid. If the reaction is weak, the part should be slightly heated with a hair dryer.

Etching is used in such cases quite often, but not always successfully. Some masters complain that they cannot achieve the desired effect for several days. This may be due to two problems:

the hole is heavily clogged with chips mixed with oil and the acid does not penetrate to the required depth;
too little acid.

That is why it is recommended to first clean the screw grooves of the fragment as much as possible and use a plasticine funnel. If you drip a few drops onto the drill, there will be no active corrosion.

Mechanical destruction of a drill fragment

Unfortunately, acid can only be used when removing debris from aluminum surfaces. If the part is made of another metal, it will be destroyed by corrosion in the same way as the drill. However, if the metal is strong enough, it is possible to destroy the fragment inside the hole not by chemical, but by mechanical means.

The alloys from which drills are made usually break and crumble easily when significant physical force is applied. Mechanical destruction of a stuck fragment can be done as follows:

select a strong metal rod whose diameter matches the diameter of the hole;
insert the rod into the hole so that its end rests against the drill bit;
wear gloves and goggles to protect your eyes from metal chips;
Use a hammer to hit the opposite end of the rod several times with force.

In many cases, this is enough for the drill inside the hole to crumble. These crumbs are either simply shaken out or removed with tweezers or two screwdrivers.

Before you start hitting the rod with a hammer, the part must be firmly fixed by placing it in a vice. You also need to be careful to avoid hitting your hands with the hammer.

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How to distinguish a metal drill from a wood drill?

When making a variety of products, it often becomes necessary to create holes in them. Metals, plant materials, and stone are used as starting materials. Therefore, it becomes necessary to distinguish drills for metal from drills for wood.

It is easy to distinguish a tool by the type of cutting edge. Drilling accessories designed for steel and alloys have pointed angles that allow them to be inserted into the body of the part. For wood, you need to use cutters that remove small chips of wood with each movement of the cutting blade in a circle.

In metal technology, it is customary to consider the process of cutting a material by introducing a wedge into it.

Cutting by introducing a wedge into the thickness of the material: α – angle of sharpening of the wedge (angle at the apex); h – cutting depth; l – chip separation length; l₁ – length of chip twisting; d – width of the blasting surface

It is assumed that the wedge itself is made of a hard substance that is stronger than the body being penetrated. Therefore, only the processed object is destroyed.
The movement of the wedge is carried out due to the applied force P. It is sufficient to have a destructive effect in the contact zone.
The sharpening angle α is less than 90⁰, so cutting into the material is possible.
The wedge has two surfaces: one faces the material being cut, which is why it was called the front; the other is adjacent to the workpiece, it is called the back.
During the destructive action, chips are formed. Depending on the plastic properties of the workpiece, it can: break into separate fragments; chip away while maintaining a single body; to be twisted, twisted.

The cutting process is characterized by the following parameters:

h – cutting depth, mm (for different types of tools this value is determined in different ways);
v – cutting speed, m/s (it is customary to consider linear movement inside the cut chip per unit of time);
s – feed, mm/rev (a criterion characterizing the productivity of the cutting edge penetration into the workpiece).

When developing a technological process for processing materials by cutting, the main parameters are calculated. From these they are further determined:

toper – the duration of the actual time required to remove the layer by cutting, min;

tpiece – piece time is calculated to determine the actual costs of a technological operation, min.

Elements of a metal drill

For metal, drills made of high-speed steel are used, as well as with overlay plates made of hard alloys. They are marked:

R6M5, R9, R18 - different versions of high-speed steel. Its main feature is the possibility of self-hardening during cooling after completion of work;
T5K6, T15K8 – carbide surfacing for drills on hardened steel. They are used to make holes in metal having a hardness of HRC 4550;
VK6, VK8, VK12 – drills with carbide tips for cast iron. They can be used to drill holes in the presence of shock loads.

Cutting edges of a twist drill for metal

A distinctive feature of a tool designed to make holes in metal parts is the presence of several cutting edges. It's easy to identify them:

jumper. It is located between the main blades;
two main blades. For different types of metals, they create their own sharpening angle;
the ribbons are two spiral edges. Their task is to form the inner surface of the hole.

When sharpening, an angle is formed between the two main blades in a special way.

Drill sharpening angle

Wood drill cutting edges

For wood, a different type of drill is used. The most widespread are perks (feather drills). The main difference is this:

there is a special cone that defines the center (in some designs a conical spiral is created here);
sharp triangles along the periphery specify the drilling diameter;
the two main cutting edges are perpendicular to the axis of rotation.

Wood drill bit

When the hole depth is shallow, there is no need for surfaces to remove chips from the holes. Due to centrifugal force, waste flies out.

Drilling and reaming

The drilling process has certain differences from other operations. This is where the tool itself rotates. At the same time, it is embedded inside the part.

Drilling and hole reaming

Possible options:

drilling, this process is characterized by the creation of a new hole;
reaming is an operation to increase the diameter of a hole.

When metal is processed, the heat generated is distributed:

on the cutting edge of the drill;
for heating the chips;
to heat the entire workpiece.

Quite a large amount of heat is released. It usually accounts for up to 50-60% of the total energy spent on the operation. Therefore, when working with steel and other alloys, they try to remove heat. Lubricants and coolants are used.

It is customary to distinguish processes by depth. If the hole is drilled to 46 diameters, then it is considered that normal drilling is being performed. If you need to get a hole in which the depth is more than 6 diameters, then such an operation is called deep drilling. Here it is necessary to supply coolant to the cutting zone.

Drilling wood

When doing woodwork, note:

the chips practically do not heat up;
the body of the part itself has local heating only in the place where the cutting edge comes into contact with the material being processed;
The edge gets very hot, there is practically no heat dissipation.

Drilling wood. The resulting chips do not heat up

When working with wood, coolant is used extremely rarely. Only wood boards impregnated with polymer resins can be treated with lubricants and cooling. Delta wood, which was previously used to make aircraft, was drilled using coolant. In those processes, the need was determined by the high productivity of labor at aircraft factories.

Main types of wood frames

Considering the design of the tool, you can note the difference:

the twist drill does not have a pronounced ribbon, but has a sharp cone for penetration in a given direction;
For deep holes I use the Lewis spiral design. It only has one main edge. She crashes into the part. During operation, the spiral itself is pressed tightly against the walls, so moving to the side is impossible;
Forstner drill is used to make shallow holes. A similar tool is used on filler machines, where recesses for fittings are made.

Is it possible to drill wood with a metal drill?

Sometimes you can hear the opinion that you should not use metal drills on wood. But in fact they are used quite successfully. They are especially often needed when it is necessary to create holes of small diameter from 23 to 810 mm.

Combination drills used to produce complex holes contain elements for working with metal. In furniture factories, such tools are quite widespread.

Combination wood drills

In one pass, a hole is made to a given depth. Along the way, a conical recess and a cylindrical recess are processed. To prepare special parameters for confirmation, slight differences are observed.

Drill for confirmation

If it is necessary to make large holes in wooden structures, crowns are used.

Simple crown

Complex crown

Finding out the drilling diameter is easy. It is indicated on the crown itself. For complex types of instruments, remove excess blades before use. They leave only what is required by the task.

It can be seen that in both designs a metal drill is used as a basis. It is installed in the center. Subsequently, the cutting edges of the crowns penetrate the periphery of the hole.

drills - their types and types.

Conclusion

Metal drills are made from steel alloys with high hardness. Often when using them, provision is made for the supply of lubricating coolants.
Different types of drills are used to make holes in wood. They are presented in the form of various designs.

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Source: https://metmastanki.ru/kak-otlichit-sverlo-po-metallu-ot-sverla-po-derevu

What drill bits should I use to drill tiles, wood and metal?

In the process of construction and repair, drills are one of the main consumables. Depending on the type of work being carried out and the surfaces being processed, craftsmen select the appropriate types of drills.

There are quite a lot of classification criteria by which drills are divided. Manufacturers today offer a wide range of products, differing in shape, material, and specific use.

What types of drills are there?

Depending on the design of the product, drills are divided into:

Spiral - with a diameter of 0.1 mm - 8 cm. This type is the most common and in demand among craftsmen, as it can drill any surfaces and materials. According to the length of the product, they can be elongated, medium and short.
Flat – used when working with natural materials, in particular wood. In addition, they serve as an excellent tool for drilling recessed holes with large diameters.
Annular - limit drilling depth, turning the material into chips. The drill design is hollow.
Centering – used to form center holes in workpieces. In the future, the formed holes are subject to modification using other types of drills.
Stepped ones are one of the latest innovations on the market. They gained popularity in the market due to the ability to work with thin materials.

The purposes of use and the materials processed are also the criteria by which drills are classified as follows:

For metal, or the second name is “universal”. Can be used in drilling objects made of metal, wood, plastic, plasterboard.
For concrete – used for processing hard, durable materials and bases. For this purpose, the design provides a carbide tip, which allows you to work with brick, concrete, and stone. Designed for use in combination with a drill and hammer drill.
For glass and ceramics. To drill such fragile materials, specialists can choose core and feather products, the surface of which is coated with diamond and carbide coating.
On wood – feather, spiral model of the product.

What drill bits should I use for wood?

Wood drilling occurs both at home and at work. Both through and blind holes are drilled in wood, depending on the type of manipulation being performed. Based on this, it is very important to choose the right type and shape of drill in order to achieve the desired result.

Today, there are a large number of varieties of drills that can be used to drill natural wood:

Universal, or for metal.
Spiral.
Feathers (classic and adjustable).
Formwork.
Screw.
Carbide.
Forstner drill - allows you to drill through wood and plywood boards.

Circular “ballerina” - allows you to form holes of large diameters in plywood, chipboard, wood.

Wood drills are a general category. They can be selected based on the type of wood, that is, its hardness, strength, and elasticity. The type of hole planned also plays a role: it will be blind, through, thin, with a large diameter, or conical tenons will be cut from wood.

What drills are suitable for metal?

When choosing the type of drill for metal, you should be guided by a number of criteria:

the base material is high-speed steel with molybdenum and tungsten;
lifetime;
product strength;
Can be used for soft and hard metals;
marking;
product color.

In fact, the most important of them are material, marking and color, and of course the manufacturer. It’s better not to skimp on drills for metal, because... they get quite hot and cheap copies can break and fly off causing harm.

Regarding the color, you can immediately understand what material it is made of and estimate the approximate service life.

Black drills are characterized by high wear resistance.
Gold-colored products have a strong base and reduce friction due to the presence of titanium nitride in the composition.
Gray - used for one-time work. Their surface is not treated with anything, thereby reducing their service life.

Drills are mainly made of steel; quality and strength directly depend on the type of steel and the degree of hardening. By type they are divided, in order of increasing strength, into:

HSS-R and HSS-G
HSS-G Co 5
HSS-G TiAN/TiN

The latter type contains titanium and has the ability to drill any type of steel. There is also a type containing cobalt; such drills are suitable for carbide and non-ferrous metals that have viscosity.

What drills should I use to drill tiles?

To arrange your home space and decorate the interior of the premises, you have to face the problem of drilling tiles. This material is characterized by fragility, so you need to drill it very carefully and resort to the use of special tools and consumables.

It is very important not to split the surface of the tile during the process, so experts recommend giving preference to drills for working with glass and ceramics. They are based on tungsten carbide, which allows you to carefully perform any drilling. They have a spear-shaped shape.

In addition to specialized drills, you can use pobedit drills, but it is important to ensure they are sharpened. To drill holes for sockets and hoods, you will have to ensure the availability of diamond bits, available on the market in different diameters.

What is the difference between drill bits for porcelain stoneware?

Porcelain stoneware is undoubtedly a durable material, and this is its main advantage. But on the other hand, this is also a disadvantage, since it is very difficult to process while maintaining integrity. There are several types of drills on the market that can be the optimal solution for drilling porcelain stoneware. The main thing is to know that standard and universal products are not suitable for these purposes.

The most common tool for drilling this durable material is a diamond core drill. It can have different sizes and diameters, so it is selected individually, based on the task at hand.

Or you can use a simple diamond drill bit. Manufacturers offer different forms of such products; differences may relate to the shape of the cutting part. To form holes with a large diameter, you can use a ballerina drill. There are also a large number of modifications, so the master selects the best option with which it will be convenient for him to work.

The choice of drill for working with porcelain stoneware, of course, plays an important role. But the correctness of the work also depends on the tool used for drilling and the technique of the process.

How to drill into concrete and bricks?

Drilling surfaces made of concrete, foam block, brick cannot be carried out with drills for metal or wood, since the desired effect will not be achieved.

The situation is explained by the fact that with prolonged contact with a solid base, the surface of a standard drill quickly becomes dull and fails. In this regard, craftsmen have to look for specialized consumables.

Concrete drills are of a conventional design with a brazed tip made of a durable alloy. According to its characteristics, the alloy is not inferior to diamond coating. The most popular drill among professionals and amateurs is the Pobedit drill.

Depending on the nature of the work performed, Pobedit glass can be:

screw;
spiral;
flat.

Using such products it will be possible to create holes with a diameter of 0.4-30 mm. If it is necessary to drill large holes, then core drills are installed on the tool. Their main purpose is to drill recesses with a diameter of up to 12 cm. Drills of this type are also divided into diamond and pobedite.

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Source: https://homelifehack.ru/instrumenty/kakimi-sverlami-sverlit-plitku-derevo-i-metall/

How to drill a hole in metal

Metal products, compared to parts made from other materials, have increased hardness and strength, so to successfully work with them requires adherence to the technological process and the use of high-quality cutting tools.

Tools for metal drilling:

Electric or hand drill;
Twist drill;
Kerner;
Hammer;
Protective glasses.

Metal drills are selected based on the diameters of the holes and the properties of the material being processed. As a rule, they are made from high-speed steels, such as R6M5K5, R6M5, R4M2. Carbide drills are used to work with cast iron, carbon and alloy hardened steels, stainless steel, and other difficult-to-cut materials.

The power of the electric drill must be designed to drill a hole of the required diameter. Manufacturers of power tools indicate the corresponding technical specifications on the product. For example, for drills with a power of 500-700 W, the maximum drilling diameter for metal is 1013 mm.

There are blind, incomplete, and through holes. They can be used to connect parts together using bolts, studs, pins and rivets. If a hole is drilled for the purpose of cutting threads, you should pay special attention to the choice of drill diameter. Due to its beating, a hole in the chuck occurs, which must be taken into account. Approximate data are presented in the table.

Drill diameter Hole layout Result

5	10	15	20
0,08	0,12	0,20	0,28
5,08	10,12	15,20	20,28

To reduce the breakdown, drilling is performed in two stages: first with a smaller diameter drill, and then with the main one. The same method of sequential drilling is used when it is necessary to make a hole of large diameter.

How to drill metal correctly with a drill

The peculiarity of drilling metal with a drill is that it is necessary to manually hold the tool, give it the correct position, and also ensure the required cutting speed.

After marking the workpiece, you should mark the center of the future hole. This will prevent the drill from moving away from the specified point. For ease of work, the workpiece should be clamped in a bench vice or placed on a stand so that it takes a stable position. The drill is installed strictly perpendicular to the surface to be drilled. This is important to avoid it breaking.

When drilling metal, you do not need to apply much pressure to the drill. On the contrary, it should decrease as you progress. This will prevent the drill from breaking and will also reduce the formation of burrs on the exit edge of the through hole. Care must be taken to remove chips. If the cutting tool is jammed, it is released by returning it to reverse rotation.

Selecting cutting mode

When using a high-speed steel tool, you can focus on the rotation speed according to the data in the table. When working with carbide drills, the permissible values are 1.52 times higher.

Drill diameter, mm Rotation speed, rpm

up to 5	610	1115	1620
13002000	7001300	400700	300400

Drilling of metal products must be carried out with cooling. If it is not used, there is a high probability that the tool will lose its cutting properties due to overheating. The cleanliness of the hole surface will be quite low. An emulsion is usually used as a coolant for hard steels. At home, machine oil is suitable. Cast iron and non-ferrous metals can be drilled without coolant.

Features of drilling deep holes

Holes are considered deep if their size is greater than five drill diameters. The peculiarity of the work here lies in the difficulties associated with cooling and chip removal. The length of the cutting part of the tool must be greater than the depth of the hole. Otherwise, the body of the part will block the screw grooves through which chips are removed and liquid for cooling and lubrication is supplied.

First, the hole is drilled with a rigid short drill to a shallow depth. This operation is necessary to set the direction and centering of the main tool. After this, a hole of the required length is made. As you progress, you need to remove metal shavings from time to time. For this purpose, use coolant, hooks, magnets, or turn the part over.

Source: https://tehnouzel.ru/tehnologii-remonta/kak-prosverlit-otverstie-v-metalle.html

How to drill concrete with a drill?

Each of us has repeatedly faced the need to mount various objects on the walls that add variety to the interior, create comfort, or simply remind us of the pleasant moments of life. Most often you have to attach lamps and sconces, paintings and photographs, mirrors and shelves to a concrete surface, install an air conditioner, or a TV.

If in the case of a small painting or photograph you can get by by driving a nail into the wall, then when the question is about more massive and heavy objects, the question of drilling holes arises.

To avoid misunderstandings when working with concrete, for example, drill breakage or dullness, it is worth properly preparing the partition, choosing a high-quality tool and selecting the correct drill.

Choosing a tool and working with it

When choosing a tool to drill a hole, you should understand that your work depends on it. A good drill accurately drills into a concrete wall or other required material, simplifying the drilling process, while a bad one will require a lot of time, may not cope with the task, or will complicate it. What you need to pay attention to when choosing a drill:

Is it possible to change the drilling speed? – this point is important, since correction of the speed mode will ensure accurate operation of the drill, helping it not to damage the surface.
Is it possible to hammer drill and adjust the depth? – impact drilling can be used on problem areas, softening them.
Is it possible to hold the drill with both hands? – a drill is not a light tool and therefore preference should be given to models that are equipped with handles.
Is the tool's power sufficient for your job?

Having decided on a drill, before starting work you need to get the hang of holding it. To do this, you should take the drill in one hand, like a pistol, and place the other hand on the handle of the tool (if it is not intended by the design, the hand is placed near the chuck).

It is necessary to hold the drill in your hands strictly horizontally, so that the hole does not turn out distorted or at the wrong angle. Wait until the drill reaches ambient temperature before turning on the drill. Sudden temperature changes can cause condensation.

If you decide to rest while working, unplug the tool.

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Surface preparation

It must be remembered that the wall is looser than the following layers.

Before you start drilling, you need to make sure that there are no wiring, pipes, or electrical cables in the selected area of the ceiling. A metal detector will help you cope with this task, as it reacts to non-ferrous metals, iron and steel.

If you ignore this condition, you may stumble upon the fittings, damage the drill, or cables/pipes that were hidden in the ceiling. If this area satisfies all the above requirements, then a point is marked on the wall, and then a small indentation is made in it at slow speed using a drill. It is also worth remembering that the surface of a concrete wall is looser than subsequent layers.

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Drill selection

This point can rightfully be considered the main one, since the quality of work and the safety of the drill itself, as well as the accuracy of the work, depend on the correctly selected drill.

Today there is a huge variety of drills on the market: for working on wood, metal, concrete. The latter are distinguished by a triangular tip. For a concrete surface, it is best to use a carbide drill, such as a Pobedit one.

This type of drill crushes the material without tearing it, which is ideal for concrete floors.

If, when drilling a wall, the drill does not go forward when it encounters a dense area, it is recommended to use a punch. Having inserted the punch into the hole, hit it with a hammer until it begins to move forward and softens the problem area. After this you can continue drilling.

It should be noted that without a punch, a hammer drill can easily cope with this kind of difficulty, but it makes holes that exceed 13 mm in diameter. If you want to use universal drills when drilling, you need to remember that they require cooling, vibration is turned off and are only suitable for a regular drill.

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A little about the structure of the drill and installation of the drill

Drilling diagram for a concrete wall.

A classic drill consists of a power cable, a button, a capacitor wire, a reverse, brushes and springs, an armature, a stator, a gearbox and a chuck, bearings, a key and mounting screws. A correctly inserted drill improves the quality of drilling and can make it safer.

The first thing you should check when starting to work with a drill is whether there is any contamination on the drill itself. A rag will be an excellent assistant in cleaning drills. If the drill is loosely secured, there is a risk that it will fly out and injure the technician. Accordingly, it is necessary to immerse the drill as much as possible into the chuck (all the way!).

Under no circumstances try to “extend” the drill by incompletely immersing it in the chuck!

It is important to ensure that the drill in the tool is secured strictly along the axis. If this rule is not followed, drilling in concrete will be performed poorly, the shape of the hole may be unpredictable, and the cause of all these misunderstandings will be the elementary effect of drill beating.

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Selection of power for drills

The optimal power for working on concrete to drill a hole is considered to be at least 600 W and 2500 rpm, but this figure must be adjusted depending on the manufacturer’s recommendations so as not to damage the drill. As mentioned, the concrete "crumbs" when we drill, and this does not require too much rotation.

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Errors when working with a drill

Clothes and gloves must fit properly.
Under no circumstances should you try to hold the rotating chuck with your hand - this is what the drill body is for. Otherwise, you may injure yourself. If you use gloves, do not take them “with reserve”. Gloves that do not fit properly may also become caught in the chuck and cause injury. Overalls should not dangle - they can be rolled up or pressed with sleeves.
You should not press as hard as you can on the turned-on drill - this will cause you to fall, as it will become more difficult for you to control your balance. In addition, you may break the drill. If a tool passes through a concrete wall, the injuries it can cause to a person can be more than serious.

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Some useful tips

If a hole is being prepared for a plastic dowel, the hole should be drilled slightly larger than the length of the dowel itself, so that the dust remaining after work does not interfere with the correct placement of the dowel.
It is correct to start drilling with low speeds - in this case, the drill will not jump on the surface, and when the hole reaches a sufficient depth, you can increase the speed, or switch the tool to impact mode.
Over time, the chuck begins to hold the drills worse and in this case they need to be replaced. If you neglect this rule, the quality of work will be much lower, and you will also be putting yourself at risk.
When drilling, do not forget to wet the drill with cold water - this will help protect it from breakage, and using special glasses will help you avoid concrete dust getting into your eyes.
By placing a plastic cup on the drill, you will avoid such troubles as dust flying around the work surface, on your clothes, hair and face.
If you work in accordance with the recommendations of the drill manufacturer, choose the right place to drill in the wall, do not make the mistakes listed above and follow safety precautions, then drilling a concrete wall will not be difficult for you.

Source: https://kladembeton.ru/tehnologija/inye/sverlenie-betona-drelyu.html

Drill bit for drilling out spot welds. Sharpening features

Auto body repair specialists are familiar with situations where it is necessary to remove a structural element of a vehicle that is attached to adjacent parts by spot welding. It is not always possible to use a hydraulic punch, so the best option is a special drill for drilling spot welding, installed in the chuck of an electric drill.

Design

A drill for spot welding is easy to identify - its working end is flat, and along the axis there is a core projection sharpened to a 90º cone, thanks to which you can get rid of the most labor-intensive stage - centering the drill. Therefore, craftsmen often use ordinary drills sharpened in a special way for drilling.

In principle, another option for drilling spot welding is possible - the use of special crowns. Such a tool includes a centering spring-loaded rod on which a cutting disk with several end teeth is mounted.

It is assumed that the user first presses the core into the metal, and then, as the bit sinks into its thickness, drills the metal around the weld area.

To give the tool the necessary rigidity, the entire structure is enclosed in a mandrel.

Let us perform a comparative assessment of the effectiveness of both drilling methods, assuming that the metal of the crown and drill is the same: high-speed steel R18 (although tools of this kind are also made from steels R6M5, R6M5K5 and even R9K6). It is preferable to use a domestically produced tool: instead of a high-speed cutter, Chinese manufacturers can offer completely different steel, such as 45X, with an expectedly poor finish.

Spot welding bit

The tool is quite massive, so it is first recommended to press the centering rod firmly against the surface of the part, and then, at low speeds, begin cutting out the metal. The difficulty is that during spot welding, the low-carbon steel from which all body parts are made is significantly strengthened. Therefore, pressing the centering rod into the metal will require significant effort from the worker.

The second problem is the non-simultaneous cutting of the teeth of the crown into the steel. This happens because the surface in the welding zone has microroughnesses formed as a result of thermal effects from the electrodes for contact welding. The result is likely eccentricity of the drilled hole.

Experts advise pre-coring the drilling sites (for example, using a screwdriver), since there are often cases when the centering rod jumps out of the socket and the bit begins to drill into the steel in a completely different place. In this case, the operation requires two driven instruments.

Another problem when using crowns is their rapid overheating, as a result of which the effect of thermal expansion increases the actual size of the resulting hole, and the attachment cracks. After use, the crowns must be cleaned of chips.

However, not everything is so bad: the crowns are double-sided, so when they become dull, it is enough to turn the tool 180º and continue working with the same set.

Drill

The tool for such purposes consists of three sections:

Core (its height is chosen so that it is no less than the thickness of the metal of the part, usually 23 mm is sufficient).
Main cutting part. It can be conventional or coated with titanium nitride, in which case the durability of the drill increases noticeably, and the dimensions of the cutting part will not depend on the heating temperature.
Mounting part for an electric drill chuck.

The drilling technology in this case is somewhat simplified: first, the core is embedded into the metal of the product, and then the required operation is performed with the side edges of the drill. In this case, the main problem is the need to keep the tool strictly perpendicular to the surface of the body part.

When choosing a drill for spot welding, you must first evaluate the accuracy of the core location, for which a caliper with a vernier division value of 0.01 mm rather than 0.1 mm is suitable. Misalignment leads to the fact that part of the drill works on unhardened metal, and therefore the load on the tool is distributed unevenly. You will also have to spend more time periodically sharpening the drill and the core itself, carefully maintaining its apex angle and height.

Using a drill for drilling spot welding, you will also need to change the speed of the drill: at first it should be small, up to 700800 min-1. However, the total complexity of the operation is still less than in the previous version, and for drilling it is enough to use only one power tool - a drill.

Source: https://proinstrumentinfo.ru/sverlo-dlya-vysverlivaniya-tochechnoj-svarki-zatochka/

What you need to know about drilling holes in metal

You can secure a metal sheet or part using a variety of fasteners. However, you need to make holes for them. Drilling holes in metal requires a person to use special tools. To carry out the work without difficulty, you need to be able to choose equipment and work with workpieces of different sizes.

Drilling holes in metal

Equipment types

Drilling begins with preparing tools for work. You can make holes using a screwdriver, drill or a special drilling machine.

To make a hole, you need to select the appropriate equipment. For metal workpieces, you need to choose specialized equipment that is suitable specifically for this material. This is due to the fact that equipment for wood, concrete or ceramic tiles have different sharpening and shape. Tooling for metal products is marked with the letters HSS.

The working part of the tool is coated with titanium nitride coating, which increases their strength and wear resistance. For hard steels, a different tooling is used, which is designated P18. The strength of the tool increases when cobalt is added to its composition. An example of marking is P6M5K5.

To drill alloy steel, drills with a tip made of carbide are used. With their help, you can drill any metal workpieces, however, due to the high price, this is not cost-effective.

When the hole is made, you can select a drill for the thread. Its diameter will depend on the previously used equipment. To make holes of different diameters in thin metal sheets, you can use cone drills.

Is it possible to drill with a drill in concrete?

Situations often arise when it is difficult to find a tool for drilling metal products at a construction site, but there is equipment for working with concrete. You cannot make holes of large diameter or in thick metal sheets with concrete drills. Otherwise, you may break the equipment or damage the surface being processed.

How to drill with a step drill?

On sale you can find stepped structures for creating holes in metal of various diameters. Several drills of different diameters are fixed on one axis. They are designed to create holes of various sizes in thin sheet metal. When working, do not rush or put too much pressure on the drill handle.

Is it possible to drill with a Pobedit drill?

Any master of finishing work will tell you that drilling metal with Pobedit equipment is unacceptable. Pobedite drills are designed for hard and, at the same time, brittle materials. These include natural stone, brick, concrete. When it hits metal, the drill will hit the surface and damage it, but there will be no hole.

How to drill large diameter holes?

Drilling large holes in metal requires the use of appropriate equipment. You can do the work in several ways:

Crown for metal surfaces. It is a circle of the required diameter with sharpened edges. There is a drill in the center that pierces the metal. Next, at low engine speeds, the bit makes a hole of the selected diameter. During work, it is necessary to use forced cooling of the sharp edges of the crown and the surface being treated.
Multi-stage operation. This implies the use of several metal drills of different diameters. Work begins with equipment of the smallest diameter and increases as drilling progresses.
Cone-shaped equipment (stepped). Designed for working with thin sheet metal.

Builders recommend using crowns. However, when working with them, it is necessary not to increase the speed and ensure that all the teeth running around the circumference are intact.

How to avoid dulling a tool?

The tool becomes dull because it overheats during use. To maintain sharpness, drilling should be done at low speed. There is no need to press the power button all the way down. When drilling thick workpieces, you need to use coolants or pastes.

If there is no cooling lubricant, machine oil can be used instead. Coolant keeps the tool from overheating and reduces friction.

How to drill metal correctly?

When you turn on the tool, the drill may slide to the side, which makes it difficult to make a hole in the selected location.
You can cope with this problem using a core. It is a metal cylinder with a sharp point at one end. It is necessary to attach the sharp end to the marking and hit the back side of the core with a hammer. There will be a notch on the metal through which a hole is drilled. DISASSEMBLY 3. Drilling metal

Drilling thick workpieces

Not many novice craftsmen know how to drill a hole in thick metal. Deep drilling is more difficult than usual. In production, it is carried out using lathes. In them, the workpiece is fixed in a movable spindle, which rotates it.

If it is not possible to use industrial equipment, you can drill a deep hole using a drill. To do this, you need to purchase special guides for power tools. Additionally, it is necessary to use machine oil for cooling. During operation, you need to stop periodically to clean out the chips and allow it to cool.

How to drill with a drill?

Drilling metal with a drill requires following some recommendations:

To make a hole you will need an electric drill, a core punch, a hammer, machine oil and safety glasses.
Initially make markings.
Wear safety glasses.
When the pressure on the drill is low, you need to select the low speed position and start working.
Don’t forget to water the area being treated with coolant.

If you follow the technology and use high-quality tools, you can make holes of different diameters and depths. To drill straight holes or accurately select the depth, you can use a device called a “depth stop.” It is attached to an electric drill and adjusted to the desired depth.

How to drill with a screwdriver?

You can drill metal workpieces not only using industrial equipment or an electric drill, but also using a cordless screwdriver. This power tool is low power. Because of this, it is suitable for drilling holes of small diameter and depth.

Drilling is performed using industrial equipment and power tools. It is important to choose the right equipment and take into account the depth and diameter of the hole. To ensure that your equipment lasts longer, you should use coolant. You need to drill perpendicularly to avoid damage to the workpiece or tool.

Source: https://metalloy.ru/obrabotka/sverlenie/otverstij-v-metalle

How to drill metal with a drill - detailed step-by-step instructions

Drilling through metal with a drill is not as easy as compared to wood, brick or mortar. There are also certain properties.

For your convenience, we have combined practical advice on this type of work into detailed instructions.

You will need these tools: a drill, a drill bit, coolant (machine oil is better, but water is also fine), a center punch, a hammer, and safety glasses.
When drilling metal occurs on a surface placed horizontally, we place a block of wood under the product and mark it as best as possible. When working vertically, rigid fixation is very important, since drilling must be strictly perpendicular.
We carry out the markings, after which we use a center punch and a hammer to mark the center of the future hole.
Pour coolant into a small container.
We put on glasses for protection.
Let's start drilling. Do not put strong pressure on the drill, because it is better to work at low speeds. If the drill is powerful, then the method of short-term activation is suitable until the tool is too late to reach the highest speed.
Remember to cool the drill more often.
When drilling is not performed strictly perpendicularly, but at an angle, there is a possibility that the drill will jam. If this happens, then set the switch to the reverse position. This will help you avoid injury and prevent you from breaking the drill.
If you did everything correctly, then even in everyday conditions, using a low-power drill, you will be able to make a hole in metal up to 5 mm thick inclusive and with a diameter of up to 10-12 mm. We will talk about more difficult missions below.

Metal drilling work

Is it possible to drill out metal with a cement mortar drill?

It is possible, but this is only in case of emergency for shallow holes with a small diameter. Not profitable.

It is better to use either standard metal drills with steel grade R6M5 or improved ones - R6M5K5.

The letter K in the marking indicates that this is an alloy with the addition of cobalt. On the market you can find a drill called “Cobalt”. We will not vouch for all manufacturers; we will only remind you that opinions on functional use in a large number of cases are positive.

How to drill with a step drill in metal?

Step drills are universal - just one is allowed to make holes of various diameters (from 2 to 40 mm). They are most productive when working with thin metal, when you need to get a neat edge.

They are better installed in a cartridge, they are easier to sharpen, and therefore, when used correctly, they work much longer, but the price is much higher than usual.

The principles of working with them are the same, but it is easier to drill large-diameter holes than with traditional twist drills. How to choose a drill for a dowel

Is it possible to drill out metal with a drill from Pobedit?

The working principle of metal drills is to cut, and with pobedite soldering, divide materials. Brick, cement mortar, and stone are better suited for this. Thanks to this, as mentioned above, you can, of course, drill out metal with a cement mortar drill, but it will instantly break and the pobedite solder will break.

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Revolutions

What is the larger hole diameter? the lower the speed should be. The greater the depth? it is therefore necessary to gradually reduce the pressure on the drill. With a drill diameter of up to 5 mm, the torque does not have to be more than 1200-1500 rpm. Based on this, 10 mm in diameter - no more than 700 rpm, 15 mm - 400 rpm.

How to drill holes in large diameter metal?

Basically, a significant part of drills for household use have a power from 500 to 800 W, which makes it possible to drill holes with a diameter of up to 10-12 mm. In metal up to 2 mm thick, using step drills it is allowed to make holes up to 40 mm.

With a thickness of 3 mm, bimetallic crowns are better suited.
Bimetallic crowns performed well when working with stainless and carbon steel and non-ferrous metals.

They also work well with multilayer materials, such as wood, chipboard, plywood, plastic, acrylic glass, asbestos cement sheet.

Bimetal bit When drilling deep holes with each tool, a magnet can be useful periodically to remove the chips.

The process of drilling metal
Much attention must be paid to safety precautions, be sure to protect your eyes from chips, and if there is skew and jamming, immediately turn off the drill and change the torque to reverse movement.

In the absence of electricity or when the roar of a working tool can disturb those around ( read : when is it allowed to make repairs so as not to quarrel with neighbors?) - an excellent solution when drilling metal is a hand-held mechanical drill, in other words, a brace. Low speed and pressure, no overheating, exactly what is needed. Of course, there are also disadvantages - time-consuming and rapid fatigue. Using this simple “old-fashioned” method, you can drill holes with a diameter of up to 10 mm.

We believe that our recommendations will be useful to you.

Additional information in this video.

drill
metal drill
drill
metal
drill

Source: http://kvartal-club.com.ua/polezno-znat/kak-sverlit-metall-drelju-podrobnaja-poshagovaja.html

What do you use to lubricate drill bits when drilling?

Hi all! You can write a very long article about how to drill metal with a drill if you wish. But I see two main problems here:

inability to drill accurately in the place where the hole is required
rapid dulling of drills

Typically, inexperienced users encounter such problems. Experienced men know what to do in such cases. Well, considering myself an experienced person, I will take the liberty of telling you how to cope with these problems. Well, I’ll also give you some tips that will also come in handy.

How to drill in the right place?

If you think about this question a little, the answer should come to your mind even without a hint. Well, at least it seems so to me. But if you don’t want to think, then read.

For this case you will need a core. This is a tool made of durable steel, having a cylindrical shape and a point at the end.

We place the tip at the desired drilling location and hit the roll on the other side with a hammer several times.

Now that you have finished drilling, place a drill on the surface of the roughness and start drilling - the tip will not run away anywhere.

How to avoid dulling drills?

Metal drills become dull if they get too hot during operation, causing them to lose their strength. Heating occurs due to friction. Moreover, the faster it spins, the more it heats up.

Hence the obvious rule - you need to drill at low drill speeds. They should be no more than 1000 per minute. But who will measure this during work? So just don't press the start button all the way. The correct speed can be assessed as follows: the eye should see the rotation of the drill. That is, the grooves on it should not merge into one for vision.

When working with thick workpieces, additional cooling is necessary. It is provided by special lubricants or pastes that are added to the drilling site, or the drill is dipped into them. In addition, they not only cool, but also lubricate the tip, resulting in less friction.

In domestic conditions there is no need to have special lubricants and pastes. You can get by with regular machine oil.

So, use a core, drill low and add some lube or oil and this job will be a cakewalk.

Source: https://MyTooling.ru/instrumenty/chem-smazyvajut-sverla-pri-sverlenii

How to drill metal with a drill?

Hi all! You can write a very long article about how to drill metal with a drill if you wish. But I see two main problems here:

inability to drill accurately in the place where the hole is required
rapid dulling of drills

Drill types

For drilling, use only metal drills (not wood, for example). They have their own sharpening and are made from certain types of steel. The most common ones are marked P6M5 - this is high-speed steel, which foreign manufacturers label as HSS.

To provide additional strength, the above drill bits are coated with titanium nitride. That's why they are yellow.

There are also stronger P18, which are used respectively for hard steels.

Also, to increase strength, cobalt can be added, and then the marking P6M5K5 is obtained.

Well, the most durable ones are drills with carbide tips. They are used for drilling alloy steels. It will also take ordinary steel, but buying it just for this will be somewhat savvy, since the price for them is quite high, and although it is hard, it still dulls. But it will be difficult to sharpen it later, since this requires a diamond blade, which is also not very cheap, and you can’t buy it everywhere.

Working with some types of metal

When drilling into thick aluminum pieces, chips often clog the drill channels, making it more difficult to rotate. Therefore, when working with such material, remove the drill from the recess more often and remove the chips. Well, don’t forget to pour plenty of oil on it.
If you need to drill black cast iron, then you do not need to add any lubricating and cooling substances, since it drills very well even dry
Unlike black cast iron, white cast iron has increased strength, which means strong drills and lubricants are required to process it.

These are the basic rules for drilling metal with a drill.

I hope I was able to bridge this gap in your knowledge. Good luck with your homework and see you soon!

Source: http://instrument-tehnika.ru/kak-sverlit-metall-drelyu/

How to drill hardened steel at home

To improve the basic characteristics of the metal, it is often hardened. This technology involves increasing the hardness of the product due to strong heating of the metal and its rapid cooling. In some cases, after heat treatment it is necessary to perform drilling. By increasing this characteristic, drilling hardened metal becomes more difficult. Let's take a closer look at all the features of drilling hardened steel.

How to drill through hardened steel

Drilling a hole in hardened steel

The widespread question of how to drill through hardened steel can be associated with the fact that when using conventional technology, the tool quickly becomes dull and becomes unusable. That is why you need to pay attention to the features of drilling hardened alloy. Among the features of the technology, we note the following points:

It is necessary to properly prepare the hardened workpiece.
In some cases, a special tool is required.
Coolant is being used.

If necessary, you can make a drill for hardened steel with your own hands, which requires certain equipment and skills. However, in most cases, a purchased version is used, since it will cope better with the task when cutting hardened steel.

Hardened steel drilling process

Nuances when drilling

The technology in question has a fairly large number of features that need to be taken into account. Drilling of hardened metal is carried out taking into account the following points:

Before carrying out work, pay attention to the hardness of the surface. This parameter is used to select the most suitable drill. Hardness can be determined using a variety of technologies.
During drilling, a large amount of heat is generated. This is why rapid wear of the cutting edge occurs. In this regard, in many cases, cooling liquid is supplied to the cutting zone.
When cutting difficult-to-cut material, it is necessary to sharpen the cutting edge from time to time. For this, a conventional sharpening machine or a special tool is used. Only diamond-coated wheels are suitable as an abrasive.

Steel Drilling Tool

There are a variety of methods for cutting hardened steel. Some of them significantly simplify the processing. Only by taking into account all the nuances can the quality of the resulting hole be improved.

Useful drilling techniques

A variety of technologies can be used to work with hardened steel. The most common technologies are characterized by the following features:

Surface treatment with acid. This technology is characterized by long-term use, since it takes quite a lot of time to reduce the surface hardness. Sulfuric, perchloric or other acid can be used for etching. The procedure involves creating a lip that will contain the substance used in the cutting zone. After prolonged exposure, the metal becomes softer, and it will be possible to drill using the conventional version.
You can use a welding machine to achieve your goal. When exposed to high temperatures, the metal becomes softer, which greatly simplifies the procedure.
Most often, a special drill is used. There are versions on sale that can be used for processing hardened steel. In their manufacture, metal with increased resistance to wear and high temperatures is used. However, the complexity of manufacturing and some other points determine that the cost of a special tool is quite high.

In addition, to achieve this goal, a punch is often purchased. It can be used to make a small hole, which will simplify further drilling.

Use of lubricants

When drilling through hardened steel, serious friction occurs. That is why it is recommended to purchase and use various lubricants. Among the features of this processing method, we note the following points:

First, the drilling area is processed. A small amount of lubricant is applied to the surface where the hole will be located.
Oil is added to the cutting edge. To process hardened steel, a small amount of the substance is required, but it must be added from time to time, since it scatters when the tool rotates.
During work, it is recommended to take breaks to cool the cutting surface and the surface being processed.

Lubricating steel with special oil

Special oil not only simplifies drilling, but also increases the service life of the tool used.

This is because oil can reduce the temperature of the cutting edge.

Twist drills, which are represented by a vertical rod with two grooves, have become quite widespread. Due to the specific arrangement of the grooves, a cutting edge is formed. Among the features of the choice, we note the following points:

The pobedite drill bit has become quite widespread. It can be used to work with various hardened alloys. However, a surface with too high hardness cannot be processed with such a tool.
The choice is also made based on diameter. It is worth considering that it is quite difficult to obtain a large diameter hole. The larger diameter version is much more expensive due to the use of a large amount of material in its manufacture.
Attention is also paid to the sharpening angle, the purpose of the product and the type of material used in manufacturing. For example, cobalt versions are characterized by higher resistance to high temperatures.
It is recommended to pay attention to products exclusively from well-known manufacturers. This is due to the fact that Chinese versions are manufactured using low-quality materials. However, such an offer is much cheaper and can be used for short-term or one-time work.
When choosing a drill, you can be guided by the markings. It can be used to determine which materials were used in production. The diameter of the hole that can be obtained when using the tool is also indicated.

Drill for hardened steel

In a specialized store you can find almost everything you need to carry out the work. However, the fairly high cost of the product and some other factors determine that some decide to make a drill themselves from scrap materials. Similar work can be done if you have the required tools.

If necessary, a drill can be made from hardened steel. Among the main recommendations for carrying out such work, we note:

Rods are selected that are made from tungsten and cobalt alloys. People call this metal victorious. Compared to a conventional drill, this version is characterized by increased wear resistance.
To process the workpiece, you need to secure it in a small vice. Otherwise, the work will be quite difficult.
To sharpen such a surface, a diamond stone is required. The usual one will not withstand long-term work.
The end surface is sharpened to create a surface that resembles a flat-head screwdriver. The cutting edges are then sharpened to produce a sharp tip.

In order to reduce the degree of surface machinability, oil is added. This ensures long-term processing due to reduced friction and lower temperature.

Homemade drill bits

In conclusion, we note that processing of hardened steel should be carried out exclusively with the use of special tools. The work requires a drilling machine, since a manual one will not allow you to get the required hole.

Source: https://stankiexpert.ru/tehnologii/kak-prosverlit-kalenuyu-stal-v-domashnikh-usloviyakh.html

How to drill out spot welds?

28.05.2018

Spot resistance welding has long been used in joining metal structures. For the automotive industry, the use of robotic spot welding has become a real salvation - instead of supporting frames, it has become possible to produce inexpensive load-bearing bodies that are superior in strength and safety to older technologies.

If it is necessary to repair such a product, the method of drilling and spot welding is usually used. This method has the following advantages:

manufacturability;
cheapness;
speed;
accessibility even for garage workshops.

Necessary tools and equipment

To quickly and efficiently replace a body part by drilling, we will need:

Power tools: drill, screwdriver, angle grinder,
Hand tools: hammer, chisel, narrow chisel.
Accessories and attachments: drill for spot welding, metal bits of appropriate diameter, sandpaper, cutting and grinding wheels.
Semi-automatic welding

The drill and grinder should have adjustable speed - this makes it easier to achieve good results. The use of hand-held mechanical drills is impractical - drilling requires a minimum of 600 - 800 rpm.

Drilling can be done through - this is how the repair part is removed from the donor body. This method can be carried out using any suitable metal equipment.

If there is a need to drill only the front part of the joined panels, then a special sharpening of the drill for spot welding will be required. It is as flat as possible, and there is a leash on the nose - a cone-shaped protrusion that holds the center in the right place. You can purchase such a drill or make it yourself.

You can remove metal around the point with a crown. It has a special spring-loaded centering stop. It is an adjustable limiter - once configured correctly, it is impossible to select “extra” iron. The crown “gnaws out” the metal around the point without thinning the part. This method is applicable to drilling out a damaged part on a body being repaired, when the contact areas of the repair part must not be damaged.

Special drill and bit for drilling spot welds.

Sharpening a drill bit for spot welding

During the resistance welding process, the metal becomes compacted, making it quite difficult to drill out. Drills must be made of durable high-speed steel and have a special sharpening.

Source: https://svarkaprosto.ru/tehnologii/chem-vysverlit-tochechnuyu-svarku