How to properly sharpen a spot welding drill

Spot welding drills

Spot welding is very widespread and is widely used in almost all areas of industry and beyond. However, a task often arises, the essence of which is not spot welding, but, on the contrary, its removal. Most often, car owners encounter this procedure when replacing or repairing body parts, etc.

Specialized drills for spot welding with increased strength were created specifically to solve this problem. With their help, removing a part welded using the spot method is quite easy. They are sold at a high price, but it is more than compensated for by their capabilities and functionality. It is worth noting that drills, if you have specialized equipment, can be sharpened repeatedly.

Advantages of a drill for drilling spot welding

Compared to alternative methods for removing spot welded joints, using a specialized drill bit has a number of advantages.

1. There is no need for various preparatory procedures. The drilling process begins immediately without preliminary punching, etc.
2. Ability to delete several connections in a row without pauses.
3. If you have equipment with which you can sharpen a drill, its service life is very long.
4. During the drilling process, the second sheet of metal is not damaged, this allows the removed part to be used in the future for its main purpose.

A large number of different products, devices, car parts, etc. They are connected to each other by non-detachable methods (bolts, nuts, screws, etc.), namely by spot welding. Accordingly, removing it without damaging it using a variety of methods is quite problematic. With the help of a welding drill, performing this procedure is as easy as shelling pears.

It is worth noting that, despite the rather narrow specialization of the drill, absolutely any drill is suitable for its use. However, it is best to use equipment that allows you to adjust the operating power.

Of course, the product will not be able to do all the work for the master, so if the part will be used again in the future, the work requires increased accuracy.

How to work with spot welding drills?

Hard materials, such as titanium, or their alloys are used as the main component to create a spot welding drill. The drill can have either one or two working tips.

The product range is quite extensive; among the wide range, finding a drill of the required diameter will not be a problem. There is one feature that must be observed without fail.

It lies in the fact that the diameter of the drill used should be approximately one and a half millimeters larger than the size of the joint being drilled.

The product is installed in a drill; you can, of course, use the mechanical version, but the work will be done much faster when using electrical equipment. The most ideal option is a device that allows you to adjust the operating power of the equipment.

Before starting the procedure, it is tedious to accurately determine the model of the drill. It must be durable and well sharpened. After choosing a specific model, according to the principle stated above, you need to select the desired diameter of the product. The process itself does not cause any difficulties even for an inexperienced master.

There is no mandatory need for punching, but professionals still recommend doing it with a small-diameter drill, as this simplifies the task. The operating torque of the equipment should be approximately eight hundred revolutions per minute.

Important: in no case should the procedure be performed at an angle; the drill must contact the joint strictly perpendicularly; if this condition cannot be met, then some other method must be chosen for drilling spot welding.

After selecting the drill model and setting up the equipment, you can begin to work. All manipulations are performed exclusively on the upper part of the metal part; in other words, only the welding fasteners are removed.

Sharpening a drill bit for spot welding

Each drill, regardless of its main purpose, needs periodic sharpening. Products for removing spot weld joints are no exception. No matter how strange it may sound, you need to start sharpening a drill by first dulling it. For this you can use regular hard sandpaper.

Next, the side edges are processed, but in no case the cutting edges. An alternative to paper can be sanding stone. After sharpening the edges, you need to check its quality and evenness of the edges. At the end, the middle of the product is sharpened. This process requires proper alignment.

Source: https://svarkagid.com/sverla-dlja-tochechnoj-svarki/

Drill for drilling spot welding: how to drill on a car and sharpening the drill

Spot welding is quite popular and widely used, regardless of the industrial sector and other factors. Along with the spot procedure process, a fairly important question is how to remove it.

Often, to cope with this problem, specialists use special drills to drill out spot welds. It can be used in mechanical engineering - to replace or repair a body, remove an element welded by spot technology, etc.

Drills for this type of welding

Spot welding drills are quite easy to identify by their appearance. Its working end has a flat surface, the axis has a cone-shaped core protrusion at a right angle. With its help, the centering of the drill is removed, which is the most labor-intensive stage in extracting the result of the point procedure.

Due to possible difficulties, experts prefer to use a regular drill, which must be sharpened properly.

An alternative option for drilling welding points is the use of specialized crowns. Their structure includes a rod with springy and centering properties, to which a disk with a cutting surface and several end teeth are attached.

Initially, the master must press the core protrusion into the metal surface, after which, controlling the immersion of the crown into the structure itself, the material is drilled near the welding seam.

Special drill for drilling spot welds.

To ensure that the part is sufficiently rigid, the structure is enclosed in a frame. In comparison with methods for eliminating the welding in question using a rod, it is worth noting that the material of the part and the crown itself may be the same.

The only difference is the type of steel R6M5, R6M5K5 or R9K6. Often such an item is used in domestic production for car repairs. In the Chinese industry, they prefer high-speed cutting materials from types 45X.

How to work with drills for spot welding?

One of the important questions in the welding industry is - how to drill a spot weld? This is often necessary when repairing a car body or other work where it is necessary to eliminate this type of welding.

To make a drill for drilling spot welding with your own hands, you need to use hard materials in the form of titanium or its alloy. The part can also have either one or more tips to work with.

The product range is quite large, where you can find a part with the necessary parameters and size. It is worth highlighting one rule that must be followed - the diameter of the rod used must be selected one and a half millimeters larger than the hole itself in the place being drilled.

The element is attached to the drilling equipment - it is possible to use a mechanical method, but the result will be better and faster using an electrical structure.

Spot welding drilling tool set.

Before starting the work process, you need to select a specific rod model. Its main characteristics should be strength and sharpness. Then the required diameter of the part is selected in the same way.

It is worth remembering that it must be a little larger in millimeters in order to drill the required hole. The procedure is not difficult, even a beginner can handle it.

It is not necessary to core, but experts still advise using a drill with a small diameter to simplify the work process. It should be noted that it is prohibited to work at an angle.

The drill should contact the surface of the material only at a right angle. If it is impossible to comply with this condition, a different method of carrying out the procedure is selected. After the drill model has been selected and the equipment is in the mood, the specialist can begin to perform the work.

All stages of the procedure are performed only in the perimeter of the upper part of the metal product. In other words, only the welding fastener is processed.

Sharpening a drill for a spot procedure

Drill sharpening machine.

Any spot welding drill bit has a primary purpose, but it also requires regular sharpening of the part. Items that are used to sharpen drills also need to be cleaned regularly.

Before sharpening a drill for resistance welding, you need to start the process with preparation - blunting. In this procedure, it is best to use regular sandpaper with a hard surface.

Then you need to use it to walk along the side edges. It is worth paying attention that the cutting edge must not be touched. Instead of paper, a special stone is sometimes used. The edges are also processed with it to trim the edges to a high-quality and even level.

Finally, the rod is sharpened to the middle length. The main thing is that drilling is convenient and easy, and for this you need to control the alignment.

Bottom line

It is necessary to note that today plasma cutting is used for the drilled hole. With its help, you can burn through any thickness of a structural part made of iron.

This is a fairly expensive service, which is why it is used in rare and extremely necessary situations. Many craftsmen who work with bodies still use spot welding.

Thanks to the appropriate drills, the work becomes easy, not costly in terms of finances, time and effort, and pays off due to its properties and functions. In addition, it is necessary to emphasize that such drills require regular sharpening using a special design.

Source: https://tutsvarka.ru/oborudovanie/sverlo-dlya-vysverlivaniya-tochechnoj-svarki

Drill for drilling spot welding: design, sharpening - Website about

Many body repair specialists have encountered a situation where it was necessary to replace any part in the car structure that was connected to adjacent elements through spot welding.

At the same time, it is not always possible to use a hydraulic punch for this, so the best solution for drilling out spot welding is a special drill placed directly in the chuck of an electric drill.

Design

It is quite easy to recognize a drill for spot welding by its appearance - along its axis there is a core protrusion sharpened to a 90-degree cone, which significantly simplifies the process of centering the drill. The working end is made flat. Based on this, many craftsmen often use ordinary drills with special sharpening to drill holes.

However, another method of drilling out spot welds is possible using special crowns. For this purpose, a tool is used that consists of a spring-loaded centering rod, on top of which a cutting disk with teeth on the end side is placed.

During the work process, the master must initially press the core into the metal surface, after which, as the crown is lowered into the thickness of the material, the weld area is drilled.

For greater rigidity, the instrument is equipped with a special frame .

It is worth making a comparative assessment of the effectiveness of the presented methods for drilling spot welding, assuming that the material of drills with crowns will be identical, namely P18 high-speed steel.

However, nothing excludes the possibility of using other steels, for example, R9K6, R6M5K5 or R6M5. It is best to use domestically made tools.

https://www.youtube.com/watch?v=YK3H2eAddTg

Instead of the usual high-speed cutter, Chinese analogues can use another material, for example, 45X steel, the service life of which is significantly lower!

Spot welding drill

The tool in question offers 3 sections:

1. Mounting element for an electric drill chuck.
2. The main cutting part, which can be presented in either a conventional version or coated with titanium nitride. In the latter case, the service life of the drill is significantly longer, while the heating temperature will not affect the dimensions of the cutting element.C
3. Kern. As a rule, its height is about 2-3 millimeters, while remaining greater than the thickness of the metal of the workpiece.

In this case, the process of drilling welding is slightly easier: first of all, the core enters the metal surface, after which the side edges of the drill begin to gradually perform the desired operation. With this approach, the main problem is that it is quite difficult to hold the tool in a strictly perpendicular position relative to the body element.

When choosing a drill for spot welding, you should take care in advance about the exact location of the core. For this purpose, it is best to use a caliper with a division of 0.01 millimeters instead of the usual 0.1 millimeters.

It is important to emphasize that misalignment causes part of the drill to pass through unhardened metal, as a result of which the tool begins to be subjected to uneven loads.

In addition, more time will have to be spent sharpening the core with the drill, each time carefully measuring its height and angle at the tip.

When using a drill to drill out spot welding, it is necessary to additionally periodically change the number of revolutions of the tool, and at the beginning of work the number of revolutions should remain small, in the region of 700-800 min-1. And still, the total labor intensity will remain lower than in the previous case, and the work will require only one tool - an electric drill.

Crown

The tool itself is quite massive, so initially you need to press the centering rod well against the surface of the metal, and then proceed to cutting out the metal at low speed.

The problem lies in the fact that low-carbon steel, which is what all body elements are made of today, is significantly strengthened during spot welding, which is why a lot of effort is required from the worker to press the centering rod into the metal surface.

Another nuance during work is that the teeth of the bit do not cut evenly into the metal, since the steel at the welding site is always distinguished by the presence of microroughnesses formed due to thermal effects from the operation of the electrodes. As a result, there is a high probability of eccentricity of the new hole.

Experienced craftsmen recommend core drilling the drilling area in advance, for example, with a screwdriver, since it often happens that the centering rod unexpectedly slips out of the socket, as a result of which the crown begins to cut metal in the wrong place. With this approach, the worker needs to acquire a pair of power tools.

The problems do not end there - rapid overheating of the bits also negatively affects the work, because the thermal expansion of the bit causes the new hole in the body to become larger than necessary, and the attachment itself begins to crack.

Do not forget to thoroughly clean the crowns from chips after work!

Although not everything is so sad, because modern crowns are double-sided, so after one side has dulled, you can simply turn the tool around and continue cutting metal with the same set.

Source: https://nzmetallspb.ru/tehnologii/sverlo-dlya-vysverlivaniya-tochechnoj-svarki-konstruktsiya-zatochka.html

Drill bit for spot welding

Spot welding technology has become quite widespread. This is due to the improvement in the quality of the connection and the reliability of the resulting seam, as well as the high productivity that can be achieved when using such technology.

Many car owners and craftsmen are faced with a situation where they need to dismantle a welded element without damaging it. In most cases, a special drill is used for this, since a hydraulic punch is not suitable in all cases.

Let's consider the features of a special drill that is used to carry out such work in more detail.

Drill bit for spot welding

Spot welding bit

Spot welding can be processed using a special crown. It is also used for drilling. The features of such a proposal include the following points:

1. The design includes a central spring-loaded rod.
2. A cutting disc is placed on the rod, which has several end teeth on the sides. Due to their specific placement, metal is removed.
3. The crown metal used is characterized by high wear resistance. That is why there are no problems with removing the alloy formed in the cutting zone.

The technology of using crowns for drilling spot welding is characterized by the following features:

1. The roll is pressed into the metal. At the very beginning of drilling, the main thing is to eliminate the possibility of the rod moving relative to the surface being processed.
2. As the tool is immersed in the metal, the alloy is drilled out. The main thing is that the working part only goes through the depth of the seam.
3. In order to increase the rigidity of the structure, the tool is placed in a special frame.

Core drill for spot welding

It is worth considering that when making a drill for drilling a spot weld and a crown, almost the same cutting alloy is used. An example is high-speed steel P18, which can withstand prolonged exposure to high temperatures without changing the main operating parameters. It is worth considering that Chinese manufacturers use 45X alloy, which is characterized by less efficiency in use.

The crown is a fairly massive instrument. That is why when using it you need to press the working part tightly against the surface being treated. It is worth considering that when working with low-carbon steel during spot welding, the structure becomes more dense and durable. That is why more effort is required when working.

Another common problem is that the design of the crown determines the uneven cutting of the teeth into the surface being processed. This is due to the presence of various protrusions that are formed during spot welding. The result of such a problem can be called eccentric drilling of a hole, after which it is quite difficult to separate the fused elements.

Drilling out spot welding

The procedure in question is quite simple to perform. You can do it as follows:

1. The most suitable tool is selected.
2. The next step is to prepare the surface. To do this, mark the drilling point.
3. After this, the minimum speed is set on the tool and direct drilling is carried out.

It is worth considering that in some cases the metal can be damaged. This is why you should work carefully.

How to prepare an area for drilling

When considering such a technology, it is worth considering that the final result largely depends on the quality of surface preparation. The features of this technology include the following points:

1. It is recommended to core the drilling site. You can use a screwdriver for this.
2. By cleaning the surface of various contaminants, you can significantly improve the quality of the work performed.

If you do not pre-prepare the surface, there is a possibility that the rod will pop out. If the load angle changes, the rod may break. In addition, with a fairly large contact area, the tool used can overheat greatly.

That is why it is possible to supply liquid to the cutting zone to cool the tool and the processed liquid.

Effective removal of spot welds

Spot welding is used to produce a wide variety of products. That is why the technology of its removal by drilling has become quite widespread. The resulting seam can be removed in a variety of ways.

You can achieve high efficiency when carrying out such work as follows:

1. Prepare the surface correctly.
2. Use only professional drills and crowns.
3. Correctly choose the operating mode of the tool used.

If you choose the right drill, you can remove almost any spot weld. It should be borne in mind that quality depends on compliance with all recommendations.

Source: https://stankiexpert.ru/tehnologicheskaya-osnastka/instrument/sverlo-dlya-vysverlivaniya-tochechnoj-svarki.html

How to sharpen a drill bit for drilling spot welding - Metalworker's Handbook

Spot welding technology has become quite widespread. This is due to the improvement in the quality of the connection and the reliability of the resulting seam, as well as the high productivity that can be achieved when using such technology.

Many car owners and craftsmen are faced with a situation where they need to dismantle a welded element without damaging it. In most cases, a special drill is used for this, since a hydraulic punch is not suitable in all cases.

Let's consider the features of a special drill that is used to carry out such work in more detail.

Drill bit for spot welding

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.

Drill

The tool for such purposes consists of three sections:

1. 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).
2. 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.
3. 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/

Drilling out spot welding

The body of any vehicle is not monolithic, but includes a large number of elements combined into one structure, and this is done through spot welding. If you need to remove one or another element, then resort to a special drill designed for spot welding.

How to prepare the area for drilling?

To make working with the car body as easy as possible, you should remove the sealing compound, paint, and all additional coatings from its surface - this allows you to fairly clearly observe the points where welding work was done.

It is worth noting that professional workers in vehicle body shops do not always remove the paint itself.

It is enough for them to lightly clean the areas welded using spot technology using sanding paper or an angle grinder - this is quite enough to clearly see the welded area.

Drill for drilling spot welding: nuances during operation and sharpening

Many body repair specialists have encountered a situation where it was necessary to replace any part in the car structure that was connected to adjacent elements through spot welding. At the same time, it is not always possible to use a hydraulic punch for this, so the best solution for drilling out spot welding is a special drill placed directly in the chuck of an electric drill.

Drill bit for drilling spot welding: characteristics, features, how to choose and use

The contact (or spot) welding method is quite simple. But, nevertheless, it is most often used to connect metal elements with elements made of artificial polymers. This is a fast welding technology that produces tight continuous seams.

But sometimes point-made structures have to be disassembled. What to use in this situation and how to remove welding points? In order to drill a spot solder connection, craftsmen mainly use drills.

This is usually done at car service stations, since cars are produced using the spot method.

We will tell you how to get rid of spot welding on automobile and any other parts, how to distinguish a classic drill from one for contact soldering, and what nuances there are in disconnecting without damaging the connected elements.

general information

Construction electric drills have little in common with their “relatives” for spot welding. The latter have a special shape that allows them to be used for separating parts with welded points.

These types of drills can make holes on any type of metal with thin sheets, including light and heavy alloys. Polymer blanks can also be processed with them.

Above we drew attention to the special shape of the drill for spot welding. It has a flat edge and a small cone-shaped protrusion.

This protrusion is sharpened at the factory at a right angle, which helps to freely place the drill centered relative to the welding point.

Professional welders say that a special drill is an optional condition for separating spot welds. Conventional construction electric drills can be used as a basis for sharpening a drill for resistance welding.

Only an experienced craftsman who uses suitable equipment can sharpen a drill. In addition, sharpening has many nuances that we will not list in this article.

Let's just say that this can be done, but the process itself requires patience, care and experience.

How to use

Unlike a drill, you can use a simple tool - a household drill. It’s good if it has low power and speed (rpm).

This could be an electric drill with the ability to manually adjust the wrapping speed. This will prevent the drill from becoming deformed while you remove the weld.

Insert the drill of your choice (regular or sharpened) into the tool and turn it a couple of times. Be sure to make sure that the drill fits well and will not fall out during operation.

Before you start drilling, mark the weld spots. To do this, use a core. Its diameter can be less than two millimeters, this is not critical. After the core, the hole can be expanded with a standard electric drill up to three millimeters.

This short action will reduce the amount of distortion in the workpiece when you finish drilling it.

If you have prepared everything correctly, set up the drill, secured the drill and processed the welding points, proceed to drilling the seam with a homemade or special drill.

The time you spend on preparation will pay off, thanks to the fact that the drilling process itself lasts a few seconds.

It is advisable to configure a drill with manual adjustment so that it does not produce more than 800 revolutions per minute, so as not to encounter its breakdown.

While working, keep the tool parallel to the structure, taking care not to tilt it too much. The drill itself should clearly rest vertically on the element you are drilling.

Conclusion

That's all we can tell you about the release of spot welded seams. To do this, you can buy a special drill at a hardware store or sharpen a regular one that you may have lying around at home.

You can learn how to sharpen drills by watching several thematic videos. If you have minimal experience, this will not be difficult.

But keep in mind that you need to work carefully, otherwise you will damage the parts that you separate. Good luck!

Source: https://prosvarku.info/prisposobleniya-i-detali/sverlo-dlya-vysverlivaniya-tochechnoj-svarki

Do-it-yourself clamping device for a planer - Metals, equipment, instructions

A planing machine is a special woodworking and metalworking tool designed for removing a layer of material, removing unevenness, defects from the surface, etc. In everyday life, simple planing devices for wood are most often used, while in production, metal units in various designs are widely used .

articles

Photo of the machine

To process spare parts, you need to correctly select the device and understand the nuances of its operation. Another option is to assemble a homemade unit.

1. Preliminary preparation. Before you start the machine, you should prepare the workpiece. Depending on the type of material being processed, preparation may include various aspects. Therefore, here you should act solely on the basis of the planned work. The main thing is to do everything efficiently so that the 7e35 cross-planing machine or its analogues fulfill the clearly assigned tasks.
2. Checking the device. Each machine has various spare parts, parts, knife shafts, a clamping device, and electric motors. Each of these parts needs a thorough condition check. The device is tested before each work shift. Household and industrial planers are equally subject to this rule. This is necessary so that the knife shafts can effectively do their job, the clamping device securely holds the parts, and the control does not fail.
3. Planing. Next comes the actual planing. Spare parts are fed to the work table, the clamping device fixes them as needed. This takes into account the dimensions of the workpieces and their compliance with the parameters of the working surface, knives, etc. The simplest version of the machine involves feeding the workpieces with your own hands. Basic industrial models allow partial automation of processes, which allows the operator to minimize the number of operations.

Two in one

Typical machine device

It would be right to make a choice in favor of combined devices. If you have such equipment as a cross-planing machine, the issue of purchasing equipment is somewhat simplified. At the same time, it is important to consider what parts you are going to process, in what quantity and for what purpose.

In some workshops, one jointing machine is really enough. The same cross planer 7307 copes well with its main tasks.

But what would be preferable to choosing the SDSR 1700 model?

• And the fact that SDSR is a planer-thicknesser machine;
• SDSR 1700 is different in that it is divided into two parts;
• The upper part of the machine is jointing;
• The lower part is thicknesser;
• To convert the device into a surface planer, simply fold out the upper planing parts;
• The installation can be re-equipped in a matter of minutes, and there is no need to use special tools for these purposes;
• Purchasing combined equipment is cheaper than purchasing two specialized devices. At the same time, you receive high-quality knife shafts, clamps, and other spare parts necessary for processing parts;
• One combination device has compact dimensions. Its dimensions do not require a large free space inside the workshop;
• At the same time, before making a choice in favor of a combined device, you should know its disadvantages. Combined equipment units do not allow processing parts and spare parts with the same precision as highly specialized machines. Provided that you need to make various parts or spare parts in large quantities in a short time, it is recommended to choose a highly specialized planing device.

Is it better to choose a dowsing, double-sided, double-post, household or homemade machine, assembled with your own hands? Only you can answer correctly here, since it depends on you which equipment can cope with the tasks assigned to it.

250 mm planing knives, high-efficiency knife shafts, a clamping device, automated control, a two-post unit, an electric motor - all this is a small part of the issues that should be studied before purchasing.

Kinds

Let's look at the main types of equipment for planing workpieces. Here knives of 250 mm or other sizes perform a single function - they remove the top layer of the workpiece. In this case, the dimensions of the knives can be more than 250 mm, the knife shafts can be equipped with auxiliary devices, and the control can be manual or automated.

All machines can be divided into two main groups:

• Transverse. Here the main movement of the machine is communicated to the tool, that is, to the shaft of the knives;
• Longitudinal. Here the main movement is imparted to the part that is processed by the machine knives. Whether they are 250 mm or more than 250 mm depends on the specific model of equipment.

Depending on the type of processing, there are several options for planing machines.

1. Thicknesser. It is used to process the workpiece using the flat planing method after operation of the jointing equipment. This allows you to check the dimensions and achieve the desired level of surface smoothness using 250 mm knives.
2. Jointer. Its main task is to perform straight planing.
3. Kalevochny. If you need knives and a machine that will give the workpiece a completed shape, then it is worth purchasing or assembling a homemade moulding unit.
4. Double sided machine. The main feature is that such a unit has knives that process the workpiece on both sides simultaneously. It is possible to make a homemade unit of this type, but to do it correctly you will need a blueprint, efficient blade shafts and some experience.
5. Quadruple. Purchasing a four-sided planer for household use is not always relevant. This equipment is distinguished by the fact that it processes workpieces simultaneously from both sides.
6. Combined. It combines the functions of planing and thicknessing equipment, replacing two different machines.

Assembling a homemade planing unit is a question that requires detailed study. You can purchase 250 mm knives, equip the machine with an electric motor and assemble the entire circuit. Or go the other way, replacing the homemade unit with a factory cross-planing device of type 7b35.

A homemade machine has a number of nuances, since it requires the installation of an effective clamping device, and the clamp must interact correctly with the knife shaft and work table.

If you make mistakes at the design or assembly stage, this will result in serious consequences in the form of poor quality processing and wasted time.

Therefore, in many cases, factory equipment is preferable to homemade planing machines.

Source: https://spb-metalloobrabotka.com/kak-zatochit-sverlo-dlya-vysverlivaniya-tochechnoy-svarki/

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:

1. Power tools: drill, screwdriver, angle grinder,
2. Hand tools: hammer, chisel, narrow chisel.
3. Accessories and attachments: drill for spot welding, metal bits of appropriate diameter, sandpaper, cutting and grinding wheels.
4. 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.

Spot welding drilling tool and technology

When carrying out repair work on car bodies or other metal structures, it becomes necessary to separate parts held together by spot welding.

This type of connection of metal elements is very common. It allows you to quickly and efficiently fasten thin metal parts together. Such technologies are widely used in the automotive industry.

Necessary tool

The following tool helps to drill resistance spot welding joints:

• hand drill (pneumatic or electric);
• a set of drills or metal bits of suitable diameter;
• hammer, center punch for applying preliminary markings to spot welding areas to be drilled;
• electric sander (if necessary).

Before drilling spot welding, you need to select drills and bits of the appropriate diameter. A bit with sharp teeth cuts metal better and is more efficient than a regular drill.

Using a hammer and punch, make a small dent at the connection point. Using a previously obtained mark, drilling is carried out.

An electric or pneumatic drill for drilling spot welding must have a speed controller. This allows you to optimally select the tool spindle speed.

Separating parts

Drilling is carried out in the places marked with a center punch until all metal is removed at the connection point.

You can drill over the paintwork or sand the metal with sandpaper to obtain a smooth surface. At the cored spots of spot welding, the metal element is bored using a drill.

Kits (steel processing tools) for this type of work are not specialized. All this can be purchased at stores that sell power tools.

Metal drilling kits come in a variety of diameters. You can always choose the appropriate version. There are also specialized products on sale, but they usually cost more.

It is necessary to drill spot welds at low and medium speeds. The sharpening angle of the drill is of particular importance. A point is made at the end, which will allow you to easily and quickly carry out the work process, removing the point connection. The power tool must be stopped periodically to allow some time to cool down.

Depending on the area of ​​the contact point, it is necessary to select a drill; usually it can be 6-8 mm in diameter. If the welding point is difficult to reach on the structure, then such places require more careful handling .

You can use a special drill attachment for this to drill the weld at a certain angle.

Auto body shops carry out such technological processes well and quickly using pneumatic drills, the air supply is carried out from an electric compressor.

The tool, powered from the mains supply, also has speed control functions. When carrying out work, you can always experimentally set the required spindle speed of the power tool.

Sheet element processing technology

It is recommended to use drills for drilling resistance spot welding on thin sheet steel only of the type recommended by the manufacturer for working on metal.

Pneumatic drills or electric drills are suitable for these purposes. Each tool has its own pros and cons when working.

An electric tool, if drilled for a long time, becomes very hot. It also cannot be used in damp areas or in rainy weather. The pneumatic type drill is safe to use in the rain or in damp areas.

To drill spot welding joints, you can use drills of a suitable diameter or specialized crowns. The last type of metalworking tool has a design function of limiting the depth of metal cutting.

This is very convenient for long periods of work. The use of a crown will help reduce the numerical percentage of defects when separating parts.

Source: https://svaring.com/welding/teorija/kak-vysverlivat-tochechnuju-svarku