To assemble modern pipelines, pipes made of plastic or metal can be used, and a welding machine is used to connect plastic pipes. As for metal products, their assembly involves the presence of threaded fittings: this ensures maximum connection strength. To implement this method, threads will need to be cut on the pipes themselves.

What tool do you need?

Threading pipes will require the following equipment:

Tape measure, pencil, caliper. To assemble the pipeline, it is necessary to develop a diagram in advance. First, a pipe with the specified length is taken: markings are made with a tape measure and a pencil. Using a caliper, the diameter is measured and suitable devices are selected. When marking, it is important to maintain considerable precision and accuracy, since any deviation from the specified size leads to a violation of the correctness of the entire structure. As a result, in such cases it is often necessary to redo the entire pipeline.
Bulgarian. Using this tool, pipes are cut according to the marked marks. A simple hacksaw for metal can perform the same functions.
Vise. During operation, the pipe must be securely fixed in a strictly horizontal position.
Machine oil or other lubricant. To facilitate manual thread cutting, it is practiced to lubricate the tool and the area being processed with a special substance.
Threading tools. Pipe threads can be cut with a die, a die or a tap. Which tool to use depends on the type of thread being cut and the preferences of the performer. For different jobs, a different pipe threading kit is used, depending on the situation. The external thread is cut with a die, which is held by a die or die holder. To apply internal threads you will need taps.

Do-it-yourself thread cutting

How to cut pipe threads yourself?

Self-threading begins with a number of preparatory measures:

Cutting a piece of pipe to size. When replacing a damaged section of a pipeline, the first step is to carefully cut out this section in a direction strictly perpendicular to the wall. If this condition is not met.
Cleaning the thread area. From the place where the pipe thread will be cut, all paint and corrosion must be completely removed: if this is not done, the work can be clearly difficult.
Chamfering. To make the work easier, you need to remove the chamfer from the ends of the pipe.

Thread cutting using a die

The die is used for cutting external threads, which requires the following operations:

Select a die with the required diameter. To make the selection correctly, you must definitely check it with a caliper.
Lubricating the internal cavity of the clamp and the prepared area on the pipe using machine oil.
Installing a clamp inside the pipe to facilitate rotational movements. As a rule, such holders are included in the kit for threading pipes. Read also: "".
Fixing the pipe in a vice. This will be required during initial pipeline assembly. If the water pipe is equipped with threads during repairs, threading is carried out locally.
Installing the clamp on the prepared area and starting rotational movements. In this way, direct thread cutting is carried out. After several rotations, the blanks are retracted back 90 degrees to remove the chips formed as a result of cutting. Upon completion of the work, the oil is completely removed.

How to cut a thread on a pipe near a wall? If the thread is cut locally on a pipeline that runs close to a wall, it may interfere with rotational movements. In this case, each time the holder tube rests against the wall, you have to move it to a different position. The cutting tool itself must remain in one position.

Cutting threads using a die

To carry out the actual work of cutting threads on a pipe using a die, the following scheme is proposed:

Using a caliper, select a suitable die with a suitable diameter.
Lubricate the tool and the treated section of the pipe with any lubricant.
Fixing the die inside a special holder. The fastening of the threaded guides (dies) in the holder must be very strong. If this condition is not met, there is a skew in the application of the thread, which makes the connection very unreliable, even leading to leaks.
Rotate the die holder in the correct direction. After making several rotations, the same procedure is followed as when using a clamp: this way it becomes possible to remove the resulting chips. For these purposes, the device needs to be unscrewed back a little.
At the end of the work, the tools and pipes are cleaned of lubricant.

The first stage is carried out with roughing dies, which clearly cut the pipe, but the accuracy of the thread in this case is insignificant. A finishing die is used for final cutting.

Cutting internal threads on pipes

A tube with an internal thread is obtained using two taps - rough and finishing. The roughing tool removes approximately 70% of the chips, the rest is removed by the finishing tool.

Internal thread cutting is carried out in the following order:

Preparing the hole. The hole in which the thread is cut must be thoroughly cleaned. All foreign coatings and deposits are removed from its surface using sandpaper.
Selecting a tap of suitable diameter.
Installing the tap inside the hole. It is very important that the threading device is in a strictly vertical position.
Beginning of rotational movements. They need to be done clockwise.

Threaded water pipes are quite often used in modern household communications. Equipping a pipe with threads on your own is a very realistic task. All you need to do is purchase the right tool and put in the effort. Carving on water pipes can be done not only by a professional craftsman, but also by an amateur: the main thing is to strictly follow the suggested recommendations and take your time.

Do you like to do home improvement work yourself, without involving various craftsmen? Self-installation or repair not only allows you to save money on calling specialists, but also greatly increases your self-esteem, right?

During the installation of communications, it is often necessary to prepare threads on pipes. We have to find ways not to spoil the product.

We will tell you how to cut threads using different tools, which method is preferable to use in a given situation. The article discusses methods available for implementation by an unqualified performer. The features of cutting different types of threads and the equipment used for this are covered.

The presented material is provided with visual photographs depicting tools for performing the work. A video with recommendations will help you understand in detail all the intricacies of this process.

The term “pipe” has a privileged position in the plumbing industry. This term is classified with an eye to a group of standards that define the criteria for connections of various elements of plumbing structures.

Pipe threads are widely used in plumbing and sewer systems, so the practice of threading, manually or automatically, is a frequently applied activity

For example, a pipe thread size is designated by a numerical value indicating the standard bore diameter of the pipe, but not the physical thread diameter.

In practice, pipe threads are used:

cylindrical ( G/BSPP),
conical ( R/BSPT),
round for shut-off sanitary fittings ( Kr),
inch cylindrical (American standard NPSM),
inch cone (American standard NPT).

A mechanic whose main work area is household work is recommended to take as a basis the conditional division of pipe threads into two main types:

cylindrical ( G),
conical ( R).

It is these two types that the home plumber most often encounters when servicing household plumbing, installation or heating equipment.

Pipe cutting is carried out in the following cases:

Image gallery

Home craftsmen today don’t often think about how to cut threads on a pipe. Most projects are implemented using alternative materials. But such a need sometimes arises. Thanks to basic skills, you will be able to independently carry out simple repairs at home or in other conditions.

Basic Concepts

A threaded connection is essential if it is necessary to install a shut-off valve, adapter tee or coupling on a metal pipe. Very often joints become unusable and have to be redone. The thread is characterized by:

depth;
walking;
profile;
profile angle;
location.

Depending on the profile and pitch, threads are distinguished:

Inch. Has the shape of a triangle. It got its name from the units in which the outer diameter is measured. Used in the assembly of plumbing and heating parts. Conventionally, they are divided into pipe and fastening. The second has a larger pitch to ensure better fixation.
Conical. The main use of this type is to ensure that the connection is sealed without the use of various sealing materials.
Cylindrical. This is a type of inch thread with a finer pitch. The upper edge of the profile is smoothed and resembles part of a cylinder. Usually the thread pitch coincides with the inch pitch for parts of suitable diameter.
Trapezoidal. Has an apex angle of 30°. Most often used in bolted connections to provide greater reliability during fixation. A thread whose sides resemble an isosceles trapezoid is called persistent.
Rectangular. Used for the same purposes as the previous type.

Note! The last two varieties belong to the metric class. They can be cut into small diameter pipes that are used in specific tools.

Based on the location of the cutting, the following are distinguished:

external;
internal.

Each of these types requires an individual approach and is intended for specific purposes.

Preparatory stage

The quality of the final product depends on how responsibly this stage is completed.

The tool that will be used to perform the work must be in good condition. There should be no rust on it. For this purpose, during long-term storage it is coated with a preservative lubricant. Clupp cutters must be well sharpened.
If the pipe has already been in use and there is paint on it, then it must be thoroughly cleaned. This is done with a file, grinder and grinding wheel, sandpaper or hair dryer.
Using a grinder or hacksaw, the plane of the end is drawn out. To do this, a small piece is cut off to make a right angle relative to the axis.
The burrs are removed with a file.
The chamfer is removed in such a way as to create a small cone.

All work is done with a die or a ladle. These are identical concepts and are synonyms. Depending on the design they can be:

Adjustable or sliding. Usually they contain several incisors, the distance between which can be changed. They are especially useful in cases where the pipe profile is uneven due to deformation or manufacturing defects, but threading is still required. Most often they are installed in clamps that provide them with good fixation. With the help of such products, threads can be cut in several passes, which increases its accuracy and quality.
Monolithic. They are a small cylinder with a hole in the middle. Such a tool is clamped into a special die holder. Usually secured with one or more bolts. With this tool, cutting is made in one pass.
Conical. Designed for cutting the corresponding threads mentioned above.

The lathe is selected depending on the diameter of the pipe being processed, as well as on the direction of the thread - right or left. All designations are applied to the packaging or directly to the instrument itself. The whole process will boil down to the following steps:

The workpiece is fixed. If it is not secured in any system, then it is clamped in a vice. In the case when cutting will be done on a water pipe or heating pipe, it is necessary to make linings to immobilize it.
The end of the prepared pipe section is lubricated with machine oil or grease. If these components are not available, then you can use what you have on hand - even lard.
The surface of the tool cutters is also lubricated.
The die holder with the leech is brought to the end of the pipe. This must be done exactly at a right angle. This is much easier to do with a die holder with a guide.
At the same time, it is necessary to rotate the thread cutting tool and press it against the pipe. Coupling has to happen. Thus, it is important to cut the first 2 turns.
If you do not use a die holder with a guide, you will need to constantly ensure that the angle remains 90°. If you do not comply with this requirement, then a imbalance may occur. This threatens that the thread will be torn off, the tool will be damaged, or the required step will not be observed.
Do not cut in a continuous pass. The process will produce metal shavings. In order to remove it, you need to make one turn in the direction of movement and half a turn back. It is thanks to this that accumulated waste will be removed.
As you progress, you also need to add lubricant.
After completion, you need to unscrew the eyeliner and go through it again to make the final liner.

Note! In order for the final result to be much better, two dies are used. One of them is called draft. Its purpose is to quickly lay out the path and marks for the next element - the finishing one. Thanks to the second die, the perfect cut is obtained.

Thread cutting using a die uses the same mechanism. In addition to this, some products have the ability not only to move the cutters, but also to rotate them. In this situation, you can use the same tool to perform both finishing and roughing passes. When using such a unit, you must be very careful during the initial stage. This is due to the fact that thanks to the ratchet handle, you can apply more force than with a conventional leash holder. If you don’t set the angle correctly at the very beginning, then you can ruin the entire workpiece and not even notice it. The clamp is inconvenient to use in cases where the pipe is already installed and is close to the wall. You will need to either bend it using a wedge or hollow out part of the plaster so that the nozzle fits well and does not move.

Using a power tool

An electric thread cutter can carry out the planned work several times faster, and the quality of the final product will be much higher. The sequence of work will be as follows:

The pipe is cut to the required size. The most acceptable result is obtained when using a reciprocating saw with a guide.
There is no need to remove the chamfer, as for the chamfer. By the way, this rule is also relevant when using a manual clamp.
A special holder is placed on the pipe. He acts as a guide. It is important to clamp it well.
The power tool is brought in and inserted into the receiver of the holder. The clamp is put on the pipe.
Lubrication is carried out using a special composition.
Then the unit does everything automatically.

There are times when to assemble a structure it is necessary to cut an internal thread in a pipe. For such purposes, a completely different tool is used - a tap. It is a small metal pin, at one end of which there are external incisors. To ensure everything goes right, you need to follow these steps:

Using a caliper, the internal diameter of the pipe is measured.
The corresponding tap is selected exactly based on this value.
All burrs are removed using a file.
The surface is treated using a metal brush.
Tap number 1 is clamped in the holder and inserted into the pipe. It will remove 70% of the material during the pass. The remaining 30% is removed with a number 2 finishing tap.
In order to remove chips along the way, the same rule applies as in the case of a lecher.
If a thread needs to be cut in one of the pipe walls, then a hole is drilled with a drill. The drill must be clearly perpendicular. This is important, because otherwise you won’t get high-quality cutting.

Note! If the pipe is in the wall, then the thread can be cut so that a few millimeters of the protruding pipe are without it. It is necessary to leave such a gap so as not to tear the product when screwing in the connector.

Nuances

There are some secrets that have been developed over the years and are rarely talked about. Here are a few of them:

You can make your task easier when using an ordinary leveler with a special guide. It is a small clamping mechanism with a thread at the end. It must be inserted into the middle of the pipe until it stops against the side and the jaws must be opened. The die is screwed onto the thread of the clamp and then goes smoothly and accurately along the pipe.
Some craftsmen recommend using dishwashing detergent as a lubricant. No matter how absurd it may sound, it provides excellent passage, and the chips are not torn, but solid, which indicates the best quality of the work done.
If you plan to install a brass tap on a steel pipe, you need to cut the thread so that when screwing on the locking mechanism, you get 4-5 turns. This will guarantee good fixation and long service.
The design of the die is such that the thread is slightly conical, i.e. the last turns are less deep than the first. In this case, the bends are not wound completely. To compensate for such a deviation, it is necessary to walk after the clamp with another ordinary leer.
There are situations when a thread needs to be cut on a pipe that extends a short distance from the wall. In this case, you can use a ruler or trim the die guide. This will not affect performance, but will provide greater convenience.
When replacing cutters in a die, be sure to follow the sequence in which they should be installed. Most often they have numbers on them that correspond to the receiver.
If the thread needs to be cut on a pipe that is recessed into the wall, then you need to do this. A small area is knocked out around the pipe to accommodate the plug. You can rotate the slicing mechanism using the T-shaped handle. A hexagonal head with slots is placed on its end. It is selected in such a way as to enter through the external hole of the die and cling to the space between the incisors.

Using the methods and methods listed above, you will definitely get an excellent result, which you will achieve with your own hands. If you know some secrets about where to cut threads and how best to do it, share them in the comments to this article.

Video

The technology for cutting threads on a metal pipe is demonstrated below:

Methods for creating threads on metal pipes. Threads on water pipes

Technology for tapping water pipes

To lay or replace a pipeline, it is necessary to organize its connection to a riser, a source of water supply. And to do this, you must first make a threaded connection. There is usually a thread on the end of the fitting of the water supply being installed, but there may not be one on the inlet pipe. In this case, you must do the threading yourself.

To do this, you will need the following tools: a clamp, complete with threaded dies (you need to select their diameter corresponding to the pipeline). As well as a tap (used for working on the inner surface), a vice or gas wrench (for fixing pipes), oil for lubrication. You will also need a metal grinder equipped with a cutting disc.

Cutting external threads on a water pipe

Grinding equipment is used to shorten the end of the water pipe that has deformation, corrosion, or unnecessary threads. The latter is strictly not recommended to be restored. This is a very labor-intensive and thankless job. Even if something comes of your idea, the optimal level of sealing of the water supply system will not be ensured, which will lead to leaks during the operation of the system;
Marking is being done. Then the water pipe is fixed in a vice or clamped with a gas wrench. This measure ensures convenience and accuracy of further work. Next, we proceed to make a perpendicular cut, which is necessary for fixing the adapters and comfort during cutting;
The thickness of the pipeline edge is reduced by removing the chamfer. This measure is necessary for high-quality wrapping of dies. To ensure that they slide well along the pipeline, machine or other lubricating oil is applied to the working area. As a last resort, oil can be replaced with regular lard;
The die holder is moved clockwise to the direction required for operation. Gradually, making several turns and twisting the die in the opposite direction, removing the resulting sawdust, we cut a thread (preferably no more than 1 cm). If the work is difficult for you and you have to put in a lot of effort, you can make the process easier by fixing an additional handle on the handle of the die holder. This will increase leverage;
The working area is cleared of lubricating oil, then the remaining metal shavings are removed.

Cutting internal threads on a water pipe

We first determine the diameter of the hole. We need the most accurate numbers. Based on this indicator, the required tap size is selected. The thread length should be several mm less than the hole depth;
Using a drill, which must be held in a strictly vertical position relative to the working surface, a hole is made. Remember to keep the tap straight. With a slope, there is a high probability of its deformation;
Insert a tap into the drilled hole. The thread is then carefully cut.

Addition: There are two types of taps: for rough work and for finishing work. At the very beginning, the first type of tap is used, and upon completion of the work, the second type is used. The equipment is lubricated with machine oil before operation.

Conclusion

With this information, you can easily install or replace water pipes. To do quality work, you only need the water pipes themselves, the necessary tools and a little skill. The instructions given in this article are relevant for pipes made of any materials.

How to cut threads on a pipe

When performing various repair work related to the restoration of water supply elements, replacement of plumbing fixtures, heating registers and other things, it is necessary to use parts of steel pipelines with threaded sections. In this article we will tell you how to cut threads on a pipe yourself. If you know the features of cutting and stock up on the appropriate tools, then this task will be completed efficiently and relatively quickly.

Features of pipe cutting

For a long time, for cutting threads on tubular elements, not metric, but the so-called inch thread has been used, which differs from the usual one by a different thread profile angle (55º versus 60º for metric). In addition, inch threads have a smaller pitch value, which is explained by the insignificant thickness of the pipe wall.

A small pitch means that there will be more threads on the same length of the threaded part. Accordingly, the reliability of the connection increases.

The thread can be right or left. On the right-hand thread, the turns, when viewed from the end of the product, go to the right, and, accordingly, on the left - to the left. Right-hand threads are much more often used.

It is very simple to determine which thread is on one of the threaded sections: if, when screwing on the joined element, it turns clockwise, it means the thread is right-handed.

On a water pipe, the direction of the turns does not matter, since the products do not rotate after connection, but remain motionless. In addition to pipe threads, fastening threads with a larger pitch are also used in connections. It is performed on hardware and holes for them.

Methods for cutting threads on pipes

You can cut threads on water pipes with your own hands using two tools - a die (also called a lerka) and a die. What is the difference between them?

The die is a hand-held thread-cutting tool, the outer side of which has a seat for the body in the form of two oppositely located grooves. And the inner side is a plate with a threaded hole and grooves for removing chips, reproducing the diameter and pitch of the required thread. At the end of the threaded profile there are so-called run-off sections. They perform a dual function: they make it easier to center sections of two pipes before joining them and improve the yield of chips generated when cutting threads. The thread diameter is marked on the end surface of the die. For cutting, the die is inserted into a collar body, equipped with removable handles for turning the die, and secured with screws.

How to properly cut a thread with a die? It is better if the pipe being cut is securely and evenly secured in a bench vice. The slightest misalignment will result in the thread being cut at an angle. This will lead to weakening of the pipe wall and distortion of the entire connected section of the plumbing or plumbing system.

To ensure reliable direction, minor modifications to the die should be made. To do this, a guide bushing is welded to one of the ends of the die, which should fit into the pipe where the thread is cut with a small gap (no more than 0.2–0.4 mm). The length of the guide sleeve must be at least twice the diameter of the thread being cut.

Clupp is a more professional thread-cutting tool (there is usually a set of several clamps of different diameters on sale). The fundamental difference between the die is that its dies are sliding and consist of four halves, so they can be adjusted to cut threads of different diameters, but of the same pitch. When placing the clamp on a section of pipe, the dies are brought to the surface and secured in the desired position. Adjustment of the relative position of the detachable dies of the die is carried out by moving its plan washer.

The threaded die already has a guide element in its design, so there will be no distortion of the cut thread when using it.

A more practical type of clamp is considered to be a ratchet clamp, the design of which includes a ratcheting mechanism. Thread cutting is done not by rotating, but by rocking movements of the handles with simultaneous feeding of the die. The clamp is indispensable if you need to cut threads on a pipe without removing it from the pipeline section.

Cutting technology

The sequence of threading a pipe consists of the following steps:

Clean the required section of the pipe from rust, paint drips and other irregularities in the outer diameter of the pipe.
Liberally lubricate the desired section of the pipe with machine oil or sulforesol, due to which the load on the handle when cutting will be significantly less. The same can be done for the die/dies.
Securely secure the pipe in a vice. In this case, the end of the pipe protruding for cutting should not be more than 5–8 of its diameters, otherwise cutting accuracy is not guaranteed. Dies with a guide bushing or die do not require such restrictions.
The pipe is prepared for cutting by using a file to obtain a lead-in cone at the end with a height of at least half the height of the die. A running section of thread is formed in this area; if this is critical, it can then be removed with a hacksaw.
A die or die is inserted, and by vigorously rotating the knob, the required threaded section is obtained. It should be remembered that the length of the cut section of the thread should be several turns longer than required. To be sure, you can run the die over the cut area several times.

So, if you follow the instructions and recommendations proposed in the article, you will be able to quickly and efficiently cut threads on a pipe. Do you have any questions about the topic? Then ask questions by writing a comment on the article.

Video

Maybe you prefer to see once rather than read pipe cutting technology many times? Then this video will be especially useful for you:

infoaqua.ru

Threading a water pipe

Basic Concepts

depth;
walking;
profile;
profile angle;
location.

Depending on the profile and pitch, threads are distinguished:

Inch. Has the shape of a triangle. It got its name from the units in which the outer diameter is measured. Used in the assembly of plumbing and heating parts. Conventionally, they are divided into pipe and fastening. The second has a larger pitch to ensure better fixation.
Conical. The main use of this type is to ensure that the connection is sealed without the use of various sealing materials.
Cylindrical. This is a type of inch thread with a finer pitch. The upper edge of the profile is smoothed and resembles part of a cylinder. Usually the thread pitch coincides with the inch pitch for parts of suitable diameter.
Trapezoidal. Has an apex angle of 30°. Most often used in bolted connections to provide greater reliability during fixation. A thread whose sides resemble an isosceles trapezoid is called persistent.
Rectangular. Used for the same purposes as the previous type.

Note! The last two varieties belong to the metric class. They can be cut into small diameter pipes that are used in specific tools.

Based on the location of the cutting, the following are distinguished:

external;
internal.

Each of these types requires an individual approach and is intended for specific purposes.

Preparatory stage

The quality of the final product depends on how responsibly this stage is completed.

The tool that will be used to perform the work must be in good condition. There should be no rust on it. For this purpose, during long-term storage it is coated with a preservative lubricant. The cutters must be well sharpened.
If the pipe has already been in use and there is paint on it, then it must be thoroughly cleaned. This is done with a file, grinder and grinding wheel, sandpaper or hair dryer.
Using a grinder or hacksaw, the plane of the end is drawn out. To do this, a small piece is cut off to make a right angle relative to the axis.
The burrs are removed with a file.
The chamfer is removed in such a way as to create a small cone.

All work is done with a die or a ladle. These are identical concepts and are synonyms. Depending on the design they can be:

Adjustable or sliding. Usually they contain several incisors, the distance between which can be changed. They are especially useful in cases where the pipe profile is uneven due to deformation or manufacturing defects, but threading is still required. Most often they are installed in clamps that provide them with good fixation. With the help of such products, threads can be cut in several passes, which increases its accuracy and quality.
Monolithic. They are a small cylinder with a hole in the middle. Such a tool is clamped into a special die holder. Usually secured with one or more bolts. With this tool, cutting is made in one pass.
Conical. Designed for cutting the corresponding threads mentioned above.

The workpiece is fixed. If it is not secured in any system, then it is clamped in a vice. In the case when cutting will be done on a water pipe or heating pipe, it is necessary to make linings to immobilize it.
The end of the prepared pipe section is lubricated with machine oil or grease. If these components are not available, then you can use what you have on hand - even lard.
The surface of the tool cutters is also lubricated.
The die holder with the leech is brought to the end of the pipe. This must be done exactly at a right angle.
At the same time, it is necessary to rotate the thread cutting tool and press it against the pipe. Coupling has to happen. Thus, it is important to cut the first 2 turns.
It is necessary to constantly ensure that the angle remains 90°. If you do not comply with this requirement, then a imbalance may occur. This threatens that the thread will be torn off, the tool will be damaged, or the required step will not be observed.
Do not cut in a continuous pass. The process will produce metal shavings. In order to remove it, you need to make one turn in the direction of movement and half a turn back. It is thanks to this that accumulated waste will be removed.
As you progress, you also need to add lubricant.
After completion, you need to unscrew the eyeliner and go through it again to make the final liner.

Note! In order for the final result to be much better, two dies are used. One of them is called draft. Its purpose is to quickly lay out the path and marks for the next element - the finishing one. Thanks to the second die, the perfect cut is obtained.

Using a power tool

An electric thread cutter can carry out the planned work several times faster, and the quality of the final product will be much higher. The sequence of work will be as follows:

The pipe is cut to the required size. The most acceptable result is obtained when using a reciprocating saw with a guide.
There is no need to remove the chamfer, as for the chamfer. By the way, this rule is also relevant when using a manual clamp.
A special holder is placed on the pipe. He acts as a guide. It is important to clamp it well.
The power tool is brought in and inserted into the receiver of the holder. The clamp is put on the pipe.
Lubrication is carried out using a special composition.
Then the unit does everything automatically.

Using a caliper, the internal diameter of the pipe is measured.
The corresponding cutter is selected exactly based on this value.
All burrs are removed using a file.
The surface is treated using a metal brush.
Tap number 1 is clamped in the holder and inserted into the pipe. It will remove 70% of the material during the pass. The remaining 30% is removed with a number 2 finishing tap.
In order to remove chips along the way, the same rule applies as in the case of a lecher.
If a thread needs to be cut in one of the pipe walls, then a hole is drilled with a drill. The drill must be clearly perpendicular. This is important, because otherwise you won’t get high-quality cutting.

Note! If the pipe is in the wall, then the thread can be cut so that a few millimeters of the protruding pipe are without it. It is necessary to leave such a gap so as not to tear the product when screwing in the connector.

Nuances

There are some secrets that have been developed over the years and are rarely talked about. Here are a few of them:

You can make your task easier when using an ordinary leveler with a special guide. It is a small clamping mechanism with a thread at the end. It must be inserted into the middle of the pipe until it stops against the side and the jaws must be opened. The die is screwed onto the thread of the clamp and then goes smoothly and accurately along the pipe.
Some craftsmen recommend using dishwashing detergent as a lubricant. No matter how absurd it may sound, it provides excellent passage, and the chips are not torn, but solid, which indicates the best quality of the work done.
If you plan to install a brass tap on a steel pipe, you need to cut a thread of such a size that when screwing on the locking mechanism, you get 4-5 turns. This will guarantee good fixation and long service.
The design of the die is such that the thread is slightly conical, i.e. the last turns are less deep than the first. In this case, the bends are not wound completely. To compensate for such a deviation, it is necessary to walk after the clamp with another ordinary leer.
There are situations when a thread needs to be cut on a pipe that extends a short distance from the wall. In this case, you can use a ruler or trim the die guide. This will not affect performance, but will provide greater convenience.
When replacing cutters in a die, be sure to follow the sequence in which they should be installed. Most often they have numbers on them that correspond to the receiver.
If the thread needs to be cut on a pipe that is recessed into the wall, then you need to do this. A small area is knocked out around the pipe to accommodate the plug. You can rotate the slicing mechanism using the T-shaped handle. A hexagonal head with slots is placed on its end. It is selected in such a way as to enter through the external hole of the die and cling to the space between the incisors.

Video

The technology for cutting threads on a metal pipe is demonstrated below:

We work in Moscow, South-Eastern Administrative District, in areas such as:

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Threading a water pipe. Master Class. - Blogs

If you decide to lay or replace an existing pipeline with new pipes, then no matter what material we use for laying the pipeline, PPR, or metal-plastic, you will definitely be faced with the need to connect the installed pipeline to a riser or other source of water supply. Of course, sometimes you can connect using gas or electric welding, but this is not always convenient or possible. And then only the threaded connection remains. But if there is a threaded connection at the end fitting of the pipeline we are installing, then as a rule there is none at the inlet pipe. And we have to cut the thread ourselves, and a tool called a die will help us with this.

I will not describe what kind of clamps there are, their abundance and variety is very great, but they are all designed for one thing, cutting threads on pipes.

To cut a threaded connection, we need the following tool, a die with a set of dies (thread cutters) which consists of a die holder head with a switch (reverse) for the direction of the working movement of the dies, and a handle. As a rule, dies (thread cutters) come in standard sizes of 12, 34, 1.12 inches. A vice or “gas wrench” for fixing the pipe. A turbine with a cutting disc for working on metal, the coolant in our case is graphite lubricant.

When carrying out work on threaded connections, special attention should be paid to compliance with safety precautions. It is necessary to use safety glasses (when working with the turbine) and construction gloves.

In order to cut a threaded connection on a pipe using a turbine, we chamfer the pipe in a circular motion, that is, we make the pipe wall a little thinner so that the dies are screwed onto the pipe correctly.

To ensure that the dies slide along the pipe and cool them, we lubricate the place where the thread is supposed to be cut with a cooling lubricant. Oddly enough, experienced plumbers use ordinary lard for lubrication.

We switch the die holder to the working direction we need (clockwise) and begin cutting the thread. In this case, you do not need to try to cut the thread right away, that is, after cutting a couple of turns of the thread, you should turn the die in the opposite direction in order to free yourself from the cut metal shavings.

If your effort to cut the thread is not enough, then you can screw an additional handle onto the handle of the die holder to increase the leverage

After the thread is cut, you should take an unnecessary threaded connection (nut, angle with internal thread) and “drive” the thread to make sure that it is cut correctly. Before screwing the connection, you need to use a rag to remove any remaining chips from the threads we have cut.

The advantages of this method of thread cutting are obvious; threads on a pipe can be cut in almost any hard-to-reach place, both with and without the use of electrical power.

poremontu.ru

How to cut threads on a water pipe: tools and methods

The abundance of plastic pipes and fittings makes threading work less relevant. Many craftsmen, even those who have worked for some time in the field of plumbing services, do not understand the process of applying grooves for a threaded connection. But sometimes the question arises, how and with what to cut a thread on a water pipe. For metal communications this knowledge is necessary.

Relevance of threaded connections

When replacing a local water supply or heating system in your own apartment, threading skills may not be required: plastic pipes and fittings are installed by soldering. But a hand tool for cutting threads on pipes is necessary when it comes to metal water pipes. Taps, shut-off valves and meters are manufactured with a detachable connection in mind. This installation principle simplifies the dismantling, repair and replacement of equipment. A pipe threading kit will allow you to create several connections in a matter of minutes, provided that the master has enough skills to work with such a tool.

A standard household pipe threading kit is designed for the most popular diameters used in the installation of private communications. Typical dies and dies are capable of creating grooves on elbows made of medium-density steel. Manufacturers expect that such products are used by mobile installation teams and private craftsmen: the kits are packaged in convenient cases, and their contents are sufficient. The plumber will not have a question about where to cut the thread on the pipe: the work can be carried out in a small room in the bathroom or restroom.

For an industrial volume of work, you will need a machine for threading pipes: only it will make smooth grooves on assemblies made of hard alloys or elbows of large diameter. The quality of the thread and the ideal combination of the internal and external planes of the two connected elbows can only be ensured by factory cutting. When working manually, the quality is controlled only visually, which does not exclude the possibility of small defects. Little things like this increase the risk of a water pipe break.

Thread Tool Overview

Pipe threading is possible both at home and in the factory. Requested techniques:

threaded dies or a plate with a row of fixed cutters;
dies, heads, taps and tools based on them;
flat and round dies with holders;
industrial milling;
grinding with abrasive factory tools.

Threading combs

Industrial equipment and threading machines

The main method of industrial production of threaded pipes is rolling with a three-roller head. Such a device for cutting threads on pipes provides an ideal groove surface, since when processing the end of the pipe, the chips that cause roughness are not removed. The end of the pipe, tightly clamped in a vice, is rolled between the grooved heads in a cold or heated state, and they leave an imprint on the surface of the metal. This thread provides an ideal combination of interconnected nodes: the role of the seal in such connections is minimal. A manual thread-cutting tool for pipes cannot provide such quality.

Less common methods, but used in private workshops and enterprises, are milling, in which thread grooves are created with a special comb clamped in a machine vice, and grinding. With the latter, the mutually rotating pipe and grinding wheel form smooth spiral grooves. As in the case of thread rolling, the accuracy and uniformity of the pitch, which is one of the most important criteria for the quality of work, can only be ensured by a professional calibrated mechanism.

Manual methods

The most popular method of creating threads is based on round dies made of high-strength steel with cutters along the inner edge. In order to reduce the effort of the master and more accurately control the work process, the cutting block is inserted into a holder or die. This device both simplifies the process and allows you to reduce the cost of purchasing a tool: the set for the master includes one, rarely two, die holders into which the necessary cutters are inserted.

Cutting threads on pipes with a clamp gives greater accuracy compared to the comb processing method: the angle of inclination of the spiral grooves is easier to control. Even when applying a long thread, you do not have to take steps, that is, the risk of disrupting the uniformity is minimal.

Set with dies of different diameters

The die or tray is equipped with chip outlets: this makes it possible to apply threads to a copper or steel pipe in one pass. Experienced craftsmen advise not to succumb to such temptation and to have a die of a similar diameter in stock for rough work. This way the main tool will dull much more slowly.

Hand tools for threading pipes are not designed for industrial workloads.

Technique of working with a manual thread cutter

The choice of how to cut threads on a heating pipe at home is not great: the most popular tool is a gate with an inserted tap.

The technique is simple, but requires precision and coordination of movements.

Select the required die diameter
The pipe is clamped in a vice or wrench.
The surface of the pipe is lubricated with oil or grease, which will facilitate sliding.
The first turns are applied with a rough die.

5.Final cutting is done with a finishing cut.

Small roughnesses are removed with sandpaper.

Video: work with a clamp

The quality of the threads on the pipes directly affects the strength and tightness of the connections, and therefore the entire water supply system as a whole. The cost of a mistake is too high: eliminating the consequences of an accident in an apartment building will cost much more than seeking the services of a professional. Plumbers do not recommend that craftsmen who do not have the skills to work with thread-cutting tools carry out this part of the work themselves: workshops and private craftsmen with a license can take orders for processing components and preparing pipes for assembly.

Threading is one of the main types of fastening of metal pipes, which can be reproduced independently. So, next we will consider which tool for cutting threads on pipes is worth purchasing, and how to use it. But before this, it is worth deciding on the basic concepts, without which the work will be impossible.

What should you know about carving?

When installing shut-off valves, adapter tees or couplings on a metal pipe, a thread must be made, which is characterized by the following parameters:

Depth- the distance from the base of the thread to the end of the pipe.
Profile and its angle- cross-section of the coil, which is made in the form of a triangle, rectangle and other shapes. When the side edges of the coils intersect, an angle is formed.
Step by step- the distance that is formed between the tops of the pipe or nearby turns.

Important: The larger the step, the greater the depth and number of turns per 1 unit. thread and therefore vice versa.

The determination of the profile and pitch should be treated with maximum attention, since the type of thread depends on this:

Inch- appears as a triangle and is used when assembling elements of a water pipe, and sometimes a heating pipe.
Cylindrical- a version of an inch thread that has a smaller pitch. The smoothed top edge of the profile resembles a cylinder. An example of an external cylindrical thread diagram is presented below:
Conical- the type allows you to obtain a hermetic connection, which is especially important when using sealing materials.
Metric- type is used for pipes of small diameters. It can be trapezoidal - the outer angle is 30 degrees, and the sides of the coil resemble a trapezoid. For bolted connections, rectangular threads can also be used, since they make the fixation more reliable. Here is a diagram of a metric thread, which looks like an equilateral triangle:

Preparing to Carve by Hand

Basic rules of use:

It is recommended to clean the pipe at the thread cutting site from paint, dirt and rust (only metal should remain);
if the pipe has a chamfer, you need to carefully remove it with a file (or a grinder, if you have the skill to work with this tool);
During operation, the surface of the pipe and the cutter must be lubricated with a special substance (it must be smeared both at the beginning of work and during the process).

If you do not follow these rules, the service life of the tools is sharply reduced, and there is also a high chance of rejecting or simply breaking the pipe itself.

Step-by-step instructions for cutting threads using a die

A die for cutting threads on pipes looks like a nut made of hardened steel, inside of which there is a flower-shaped hole, the edges closest to the center are covered with sharp cutting surfaces, and “petals” allow the chips to be easily discharged without interfering with the work.

Working with the tool is not difficult:

Firmly install the pipe vertically. It must also be prepared - cleaned of paint, chamfers, etc. The ratchet handle for cutting pipe threads holds a tool of the appropriate size, and you apply lubricant to the pipe.
Place the die strictly perpendicular to the pipe. If there is a deviation of at least 5-10 degrees, then the pipe will already be damaged.
Start moving the holder handle clockwise.
When the required space is covered with threads, lift the cutter up and go down again over what has already been cut so that the grooves are clearer.

This video is a demonstration of the correct use of the die. Visual actions follow after the preparatory steps listed above:

Remember to periodically lubricate the cutter and pipe. Act smoothly and calmly. Do not pull the die while working and do not leave the process unfinished.

Threading set for pipes and rules for its use

An ideal option for home use is a pipe threading set. Klupp is a modernized die that has a special guide and ratchet. The tools in the set may be different, for example:

Sliding. As a rule, they consist of incisors, the distance between which can be adjusted. Allows you to cut threads in several approaches, accurately and efficiently.
Monolithic. The tool has a cylindrical shape with an internal hole and is installed in a die holder. Allows you to make carvings in one go.

Sets and individual components vary greatly in price and quality. There are budget options for sets for 1000 - 1100 rubles, and there are much higher ones.

Depending on the diameter of the pipe and the direction of the thread (right, left), the guide is selected. The further work process looks like this:

The clamp is installed in the ratchet;
oil is applied to the cutting part;
a guide is installed on the edge of the pipe;
the ratchet rotates, making threads;
During operation, the edges and pipe are treated with oil.

It is necessary to change the die on time - it must always be sharp, and all other elements must be in good working order.

An example of thread cutting using a die is presented in the video:

Threading a pipe near a wall

You may have a situation where you need to make threads on a pipe that is already built into the wall. The principle of operation in this situation is exactly the same as described above. However, there is a big “but”: the device needs space to operate, so you may have to remove part of the wall. An example of such work is demonstrated in the video:

Important! The cut on the pipe must be made perfectly even, otherwise cutting the thread will be extremely difficult.

How to cut internal threads?

To manually make internal threads, taps are used that are inserted into the drivers. They consist of three parts:

Zabornoy. Used directly for cutting;
Calibrating. The middle part is necessary for guidance during sizing and cutting;
Tail. The part has a square head and is used to hold the tap in the driver when cutting.

How to cut an internal trapezoidal thread can be seen in the video instructions:

Gutter cutting machine

A machine for cutting threads on pipes is unlikely to be needed by a person who is equipping his home. It's more of a working tool. In design, it is somewhat reminiscent of vertical drilling machines.

The diameter of the workpiece and the cutting pitch are adjustable. The operation of the spindle can be carefully debugged by adjusting the number and speed of revolutions. In principle, such a machine does almost all the work. Also, unlike manual lechers, the machine can make not only external threads, but also internal ones. More modern machines can process the smallest parts and products with thin walls.

In the following video you can clearly see how the machine works without distortions:

Video: Manual thread cutting in a country workshop

In the following video, the master will tell you in detail what needs to be taken into account for proper thread cutting, and how to do the job correctly:

Above we describe in detail all the main stages of work that both a beginner and a seasoned master need to know when cutting threads. However, if you understand that this process is not working for you, and you need to continue the repairs, it is best to contact a professional technician.