How to cut threads on a pipe

How to cut a thread on a pipe near a wall? — Metals, equipment, instructions

The answer to the question of how to cut a thread on a pipe is not as complicated as it seems at first glance - it can be solved exclusively by brute force and common sense, which every professional craftsman should be able to use. This master class from the site stroisovety.org will reveal to novice specialists all the subtleties and nuances of cutting pipe threads using a manual machine.

Threading machine photo

How to cut threads on a pipe: preparing a pipe cut

The thread cutting process begins from the very moment when you first touch the angle grinder to the pipe being cut - if you do not know how to cut smoothly, you will have to fiddle with the edge alignment for a long time.

The fact is that it is quite difficult to screw anything onto the thread cut on the beveled end of the pipe. Therefore, this must be taken care of at the stage of cutting out the pipeline.

In this regard, no one will help you, and you will have to learn to cut smoothly with a grinder on your own.

How to cut threads on a pipe with your own hands photo

The next nuance that cannot be ignored when answering the question of how to properly cut a thread on a pipe is chamfering, without which it will also be difficult to screw fittings or shut-off valves onto the finished thread.

The chamfer is removed with a small grinder - the pipe is simply sharpened so that its edge is at an angle of approximately 45˚. You can do it a little more or a little less - it doesn’t matter, the main thing is that the future thread has a high-quality start.

How to chamfer a pipe photo

We should also talk about the condition of the pipe itself. As a rule, thread cutting is done in places where the steel pipe tends to rot most quickly. Near the floor, ceiling and welds, steel is very susceptible to corrosion.

The pipe should be examined, and if the thickness of its walls is too small, then it is better to refuse threading in this place. The fact is that by cutting metal with a sharpening tool, you will weaken the steel even more, and it will rot very, very quickly.

But let’s return to the immediate answer to the question of how to cut a thread on a pipe with a die or, as it is also called, a die.

Do-it-yourself pipe threading technology

To ensure the best movement of a thread-cutting tool on hard metal, the pipe must first be lubricated - any lubricant is great for these purposes. A classic of the genre in this regard is lard. Yes, yes, you heard right! But by and large, sunflower oil is also suitable.

Now we put a machine on the end of the pipe and adjust the ratchet so that it returns freely counterclockwise. When everything is ready and the machine is set up, we slowly begin to cut. For the process to start, you need to apply a little pressure on the stem towards the pipe - you don’t need to press all the time. When the blade bites the metal and the cutting process is in full swing, there will be no need for this pressure.

How to cut a thread correctly photo

The cutting process itself must be carried out in stages. You need to proceed like this - first we cut one turn of thread, then we rearrange the ratchet and turn the ratchet in the opposite direction to chop off the chips. If this is not done, then in order to cut a thread on a water pipe, you will have to put in a lot of effort. This is how pipe threads are cut, step by step.

Ratchet for thread cutting photo

Ask how long to cut? I’ll tell you straight - all the teeth of the lerka should be on the pipe. Why? Everything is simple here - the thread cutting tool is made in such a way that each subsequent turn cuts the metal to a certain depth.

In order to obtain a full-fledged thread, so to speak, completely cut, all the teeth of the thread must take part in the thread cutting process, without exception.

In general, if you roll half a centimeter of thread, then you will not fully screw the fitting onto it.

How to cut threads on a water pipe with your own hands photo

When the thread is completely cut, the ratchet switches to reverse and is screwed off the pipe. Be sure to check how the fitting or tap is screwed onto the freshly rolled thread. In general, the final solution to the question of how to cut a thread with a die requires a high-quality check of it.

Well, concluding the topic of how to cut a thread on a pipe, I would like to give a couple of tips: firstly, during the cutting process, the pipe must be properly held with an adjustable wrench so that the riser does not turn and break in the ceiling; secondly, do not try to cut the thread too low to the floor - you won’t succeed anyway (if such a need arises, it is better to negotiate with your neighbors and make a cut close to the floor or ceiling).

Author of the article Alexander Kulikov

Source: https://spb-metalloobrabotka.com/kak-narezat-rezbu-na-trube-vozle-steny/

How to cut threads on a pipe with your own hands - Metalworker's Guide

When performing work related to the installation of plumbing or heating, it becomes necessary to cut threads on pipes.

To do this, you can take a pipe and head to the metal rolling mill, where the threads will be cut in a matter of minutes.

However, this method has not been relevant for a long time, since there are other options that do not require transporting the pipe to production.

Existing threading options

Pipe threads are divided into five types, but the most popular options are conical and cylindrical. Household members often encounter such types of pipe threads. There are two methods for threading a water pipe:

• Automatic, which involves cutting threads on water supply pipes using special machines and power tools.
• Manual. For this, special hand tools are used.

If, as part of his job, a person needs to cut threads on a large number of pipes, then it is appropriate to purchase a special power tool, which will facilitate manual labor.

When the need to obtain a threaded connection is an isolated case, then manual technology is suitable for such purposes. On water pipelines, as well as pipes of heating systems, thread cutting is performed using a die.

A die (another name for a die) is the simplest device intended for cutting external threaded connections on pipes.

The die is a steel disk, and its inner diameter has axial holes in different numbers, which depends on the size of the product.

The edges of these holes form cutters, with the help of which thread cutting is performed.

To ensure the reliability of such a tool, it is made of alloy steel or hard alloys.

Dies can have different shapes (round, square, hexagonal or prismatic), but most often disc options are used.

Disc dies are intended for making threaded connections on water pipes.

To make it convenient to work with the die, they are equipped with additional knobs, as well as clamps in the form of screws. Dies are also solid, split and sliding.

Solid dies for threading pipes have one significant drawback - rapid wear of the cutters. This is due to the rigidity of the product’s own design. Split or spring-loaded dies have a less rigid design, which significantly increases the service life of the product.

Due to the spring-loaded mechanism, such a tool for cutting threads on pipes allows you to vary the diameter of the resulting threaded connections in the range from 0.1 to 0.3 mm. A device of this type is highly resistant to cutter wear, but is not capable of providing high accuracy.

Sliding dies are 2 working parts intended for installation in a mounting module.

A die with a special fastening module forms a tool called a pipe clamp. The die is fixed in the die using a cracker and an adjusting screw.

It is with the help of the adjusting screw that the thread diameter is adjusted.

Typically, pipe clamps are supplied complete with dies of various diameters. Having such a set, you can always cut threads on a pipe of any diameter.

How to cut a thread on a pipe with your own hands

To make threading on a pipe with your own hands, you initially need to perform a number of preparatory measures:

1. Carefully clean the tube in the area where you plan to get the threads.
2. Clean the end part of the product with a file.
3. Lubricate the working area to reduce resistance.

In order for the thread cutting process to be convenient and the end result to meet the requirements, before carrying out the action you need to secure the product in a vice. This will allow you to fix the part so that you can perform the necessary actions with both hands. After this, the following actions are carried out:

1. A wrench with a die of the required diameter is used, with the help of which a rough pass is carried out. In this case, it is important to keep the die strictly perpendicular to the pipe.
2. The roughing pass is the basis of thread cutting, so do not rush and perform the actions slowly but efficiently.
3. A rough cut allows you to get 2-3 threads of thread. This is exactly how many threads are needed for the tool to take a secure position.
4. The next step is to twist the rough die and use the finishing die. With its help, the required number of threads is cut on a pipe that is planned to be installed in a water supply or heating system.
5. After each pass, you need to make 0.5 turns back to clear the cutting area from chips.
6. At the final stage, you should use the third die, which carries out a control pass.

When threading, it is important that all actions are performed slowly, and with each subsequent turn the cut area is cleared of metal shavings.

How to cut threads on a pipe near a wall

Often thread cutting needs to be done on site when the pipeline is fixed in one part to the water supply or heating system.

In hard-to-reach places, it is impossible to cut threads on a pipeline installed near a wall using a die and a wrench.

For such purposes, you will need to use a thread-cutting device such as a clamp with a ratchet. With its help, the thread cutting process is simplified several times.

The procedure for thread cutting with a manual die is carried out as follows:

1. A nozzle of the appropriate diameter is fixed in the clamp mount, after which you can begin the procedure itself.
2. The surface of the pipe - the working area - is cleaned.
3. The area to be cut must be cleaned until a metallic shine appears.
4. A chamfer is made at an angle of 45-60 degrees.
5. The material is lubricated with Litol or Solidol.
6. The key is placed on the working area of ​​the pipe.
7. Moderate back-and-forth rotations of the instrument are performed.

As with a die, when working with a die, you need to make half a turn back after each new thread to remove the metal edge.

To facilitate the threading process, you can use an electric die, but it is rational to purchase such a tool only if you need to use it every day.

On pipes you can cut not only external but also internal threads, for which taps are used.

However, the need to obtain threads on the inside of the pipeline arises only in rare cases.

Knowing the features of self-threading, you will never have problems with the installation of water supply and heating systems.

Source: https://ssk2121.com/kak-narezat-rezbu-na-trube-svoimi-rukami/

How to cut threads on a metal pipe

Threaded connections are used in the manufacture of a wide variety of products. This is due to the fact that you can cut it yourself using inexpensive equipment. Before applying coils to the surface of the product, you should consider the main points regarding certain parameters. High-quality threads are characterized by a tight connection and high reliability. Let's take a closer look at the process of cutting turns on pipes.

Preparing to Carve by Hand

Threading pipes at home can be done using available tools. The basic rules of preparation are as follows:

1. At the place where the coils are cut, dirt, rust and other contaminants are removed. This recommendation is due to the fact that foreign elements can degrade the quality of the turns.
2. If there is a chamfer on the pipe, it is carefully removed using a file. In some cases, this process is carried out with a grinder, but the quality of the resulting chamfer may be low. Therefore, if there is no need to rush, then it is best to carry out the work with a file.
3. At the time of work, the surface should be well lubricated with oil. Only in this case can the smooth running of the mechanism used be ensured.

If you do not follow the above recommendations regarding the preparatory stage, the working part can quickly wear out, and the process itself becomes more complicated. In some cases, strong impact can lead to pipe failure.

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

The most common is a die of various types. It is one of the necessary tools for thread cutting. Among its features, we note the following points:

1. The die looks like a nut made of hardened steel. On the end sides there are holes made in the shape of a flower. To ensure mechanical processing, the faces are represented by sharp cutting edges. The petal shape ensures removal of chips from the cutting zone.
2. The body has holes for installing the handle. They are located on the sides, thereby ensuring uniform impact.

The die has become widespread due to the fact that it is quite easy to use. Recommendations for its use are as follows:

1. At the time of processing, the pipe must be vertical. At the same time, it is fixed using a vice.
2. It is recommended to clean the surface and create a chamfer.
3. Oil should be applied to the pipe, which will simplify the movement of the die along the pipe.
4. It is worth considering that the die must be positioned strictly vertically. Even a deviation of only 10 degrees will lead to a decrease in the quality of the resulting turns.
5. The handle should be rotated clockwise.
6. In order to improve the quality of the resulting surface, after two turns, one should be made in reverse, thereby ensuring the removal of metal residues from the cutting part.

Thread cutting with a die

During work, you should periodically lubricate the working part and the pipe with oil. Lubricants make the cutting process easier and smoother.

Threading set for pipes and rules for its use

You can significantly simplify the task of cutting threads by purchasing a special set for pipes. It is ideal for use at home. An example is a clamp - a slightly modified die, which is used together with a ratchet and a guide. The set may include various accessories:

1. Monolithic ones are represented by a cylindrical body with an internal hole. For work, the kit also includes a special die holder.
2. Sliding ones consist of incisors, the distance between which can be adjusted if necessary. It is used for cutting a threaded surface in several passes, thereby increasing quality.

The hole is selected depending on the diameter of the pipe and the direction of the thread. The cutting process is characterized by the following features:

1. A special tool called a clamp is installed in the ratchet.
2. Oil is also applied to the cutting part, which simplifies the movement of the working part.
3. A guide is installed on the edge of the pipe being processed.
4. The ratchet rotates around an axis, due to which threads are formed.
5. During machining, oil is added from time to time.

Pipe threading set

It is worth considering the fact that the device may become dull after prolonged use. That is why you need to monitor the condition of the cutting edge.

Threading a pipe near a wall

The most problems arise with cutting threads on a pipe that is located near the wall. This is due to the location of the workpiece and insufficient free space. That is why a common question is how to cut threads on a pipe.

In such a case, processing is carried out using similar tools. However, threading a pipe near a wall is often only possible by partially removing the wall. Among other features of the procedure, we note the following points:

1. If you need to cut a thread on one of the sections of the pipeline, it is recommended to first dismantle it. In some cases this is possible.
2. Cutting pipe threads also requires a fairly large amount of oil, which facilitates the movement of the device. However, when the pipe is positioned horizontally, it begins to drain quickly, which creates significant problems with carrying out the process in question.
3. The carving is made in several passes, which ensures a high quality surface.

Source: https://crast.ru/instrumenty/chem-narezat-rezbu-na-metallicheskoj-trube

How to cut internal threads in a pipe?

If you need to connect two metal pipes, you cannot do without threading.

To thoroughly understand this issue, the material in our article will be very useful to you.

It contains all the necessary information about which tools are best to use and how to use them correctly.

You will learn about different thread cutting methods and some professional secrets that make this process much easier.

First, let's understand the basic concepts.

Pitch, profile and thread depth

When connecting metal pipes and various shut-off valves (for example, adapters or couplings), a threaded connection is used. The main characteristics of the thread are:

• depth;
• profile and profile angle;
• thread pitch;

Depth is the distance from the beginning of the thread to the end of the pipe;

Profile – cross section of a coil. It can take the form of various geometric shapes. For example, a rectangle or a triangle.

Thread pitch is determined by the distance between adjacent turns.

Note: the larger the thread pitch, the greater its depth and the greater the number of turns per unit of thread.

There are different types of carvings. Each of them is used to solve specific problems.

Types of thread

• metric thread is the main type of fastening thread for products manufactured in our country;
• inch thread - has a triangular profile. It is used mainly for the installation of water pipes, less often for heating systems;

• cylindrical thread is a type of inch thread, but has a smaller pitch and rounded cavities;
• conical threads have rounded peaks and valleys and are used in cases where tightness of the connection is especially necessary (for example, under high pressure)

Secrets of mastery

To cut threads efficiently, you need to follow several basic rules:

• the pipe must be clean. Dirt, rust and paint residues must first be removed;
• the chamfer, if present, must also be removed. You can use a file or grinder for this purpose;
• to protect the tools used from damage and make work easier, you need to lubricate the pipe and the tool itself with a special emulsion;

Listen to our advice. Then the tools will serve you for a long time and the carving will be of high quality.

Cutting threads using a die

The easiest way to cut threads is to use a die. A hardened nut with special holes forms special cutting edges and removes chips.

The main purpose of the die is cutting external threads.

How to work with a die

• prepare the pipe as necessary: ​​clean it of dirt and paint residues. Clean the chamfers;
• secure the pipe strictly vertically;
• apply a special emulsion;
• lightly press the handles of the die and twist it clockwise;

• To make the thread clear enough, once again go up and down with the die along the already cut thread;
• Do not forget, during work, to lubricate the contacting parts with a special emulsion.

What is a die and why is it easy to cut threads with it?

Klupp is a modified version of the die. It can be sliding or monolithic. Its distinctive feature is the presence of four replaceable cutting plates.

With the help of a die, you can cut threads of different diameters much faster and with less effort than when using an ordinary die.

It is worth noting that in the manufacture of the die, high-quality steel is used only for cutting surfaces. Therefore, this tool is accessible and economical.

How to work with a clamp

• attach the clamp to the ratchet;
• apply a special emulsion to the parts being processed;
• insert the end of the pipe into the guide and turn the ratchet;

• act smoothly, without sudden efforts;
• during the threading process, do not forget to lubricate the contacting parts;
• If the die becomes dull, change the cutting edges in time.

Features of internal thread cutting

When connecting metal pipes, it is often necessary to cut internal threads. The internal thread is cut with a tap.

Taps are made from tool alloy steel.

The tap consists of a shank and a working part.

To rotate the tap when cutting internal threads, a wrench is usually used. To cut high-quality internal threads, you need to proceed as follows:

• install the tap and lubricate the contacting surfaces with a special oil emulsion;
• press the knob against the tap and turn it up to two or three turns;
• then turn the tap with light pressure. Hands need to be rearranged every half turn;
• rotate the tap along the already cut thread to remove chips and make the thread especially clear;

Of course, for cutting threads on metal pipes, it is best to use special machines.

However, if you do not have such an opportunity, then you will be able to solve the problem on your own.

We hope that our article was useful to you and helped you understand how to properly apply threaded connections.

Photo of correct thread cutting on pipes

Source: https://tepliysezon.com/kak-narezat-vnutrennyuyu-rezbu-v-trube/

How to cut threads on a pipe with a tool?

Nowadays, a lecher is understood as a tool with which you can easily create coils on a water pipe or other types of similar products.

Thread cutting tool

A thread-cutting tool for creating turns is presented in the form of a nut made of durable metal, in the hole of which there are cutting teeth and edges. How to cut threads correctly with its help – we’ll figure it out below.

Description of design

The teeth are located at such angles that when the blade rotates, turns are formed. The cutting edge of the tool has the shape of a cone, with a thickness of 8-10 turns (teeth).

In most cases, hand threading of a pipe is done using a solid round tool.

The device for forming coils is mounted in a special holder, and its surface can have up to five grooves.

Ledger with a set of dies

These grooves make up the working part, which consists of three zones. In the upper and lower parts there are conical sections - cutting zones, with the help of which cutting is carried out.

The device for making round threads can be used for cutting pipe, metric or inch threads.

Such tools have one advantageous feature: when forming, all three edges of the working area work, this allows you to create a thread on a pipe in one pass.

Types and differences

A thread cutting tool can be:

• whole;
• split;
• sliding;
• round;
• square;
• hexagonal;
• prismatic.

The thread cutting set is classified taking into account not only the shape, but also the design of the body.

Pipe thread cutting tools

The formation of round type turns is carried out using a tool complying with GOST 13536–68; cutting cylindrical threads on pipes is carried out with a tool that complies with GOST 9740–71.

Conical cutting on pipes is used with tools manufactured in accordance with GOST 6211–81. It is recommended to make turns using the most common round leash.

This threading tool allows you to form threads with coarse pitches in metric measurements or pipe threads with fine pitches in inch measurements.

However, if the carving on the pipe requires special precision, then a round pipe will not work. This is explained by the fact that its cutting edge during manufacturing is not subjected to grinding after heat treatment.

Thread cutting with a measuring tool

Another feature is the dependence of the size of the thread being cut on the outer diameter of the tool. The larger the diameter of the hole in the hole, the better the removal of chips will be and the better the threads on the pipe will be made.

Solid and sliding tray

A solid-type thread-cutting tool allows you to achieve good quality coils on a pipe. Using a one-piece tool, you can form both metric and inch threads.

Thread cutting using a solid tool happens quite quickly, and a good result is achieved due to the high rigidity of the metal from which the tool is made.

The only significant drawback of a solid thread tapper is the low level of wear resistance.

Such models can be used in cases where there are no special precision requirements for the thread.

The threading tool may spring back slightly during operation, which will lead to minor changes in the thread diameter.

The difference can be 0.1-0.3 mm. Another disadvantage of a one-piece tool is its low degree of rigidity, due to which thread cutting is not always clean and accurate.

Slicing process

The sliding type tool is equipped with special guides that greatly facilitate thread cutting.

This model consists of two parts, which are attached to the frame using special screws. Screws help to accurately regulate the parameters of the turns cut on the pipe.

For the most efficient work, it is recommended to acquire a whole set of dies - this will allow you to create cuts of the desired diameter without much effort and difficulty. Before cutting the threads on the pipe, it is important to secure the sliding ladder with locking screws.

Also for this purpose, thread-cutting chucks can be used, for fastening which conical-shaped recesses and special angular-type grooves are used. The grooves perfectly help regulate the accuracy of the future connection.

Special lerks

In addition to conventional tools, special tools can be used for cutting threads on pipes. They can be:

• metric;
• left;
• pipe;
• pipe conical.

Before cutting a thread on a pipe, you need to pay attention to the specific markings of the product.

Cutting process

So, for example, a metric tool makes turns in millimeters, and can be designated as M8, M10, and so on. Accordingly, with such a tool you can cut threads with a diameter of 8 or 10 mm on a pipe.

In addition, the cutting with this tool is done step by step, and each individual step corresponds to the distance between new turns.

A metric tape measure can have not only a main pitch, but also an additional pitch pitch. Such thread cutting tools can be marked M 12-1.5, M 12-0.75 or M 12-0.5. The distance between the turns will decrease in proportion to the decrease in pitch.

It is especially worth highlighting the left-hand thread. Already from the name it is clear that the presented tool provides left-handed thread cutting.

This variety is not as common as the traditional one, but to perform them you will need a special thread-cutting tool.

Typically, a device of this type is used for cutting threads on pipe connections that will subsequently need to rotate. This variation is distinguished by a special marking, which is designated as LN.

The pipe tool creates cylindrical threads on small tubes, studs and rods. The conical blade is indispensable when creating heating and water supply systems. The product is marked “K”.

Recommendations for work

Before cutting a thread, you should know certain rules for working with the tool.

If they are not followed, the thread may turn out to be of poor quality, and the threading tool will not last long or may even be damaged during cutting. There are a number of requirements not only for the tool, but also for carrying out work of this type:

• work should always be performed only with the help of a serviceable and sufficiently sharp tool;
• Before starting work, the metal pipe is pre-prepared - old paint, rust and dirt are removed from the cutting site. The surface is cleaned to bare metal;
• using a file or grinder, an external chamfer is made at the end of the pipe;
• When creating turns, it is necessary to periodically lubricate the cutters and the working surface of the pipe. For this purpose, a lubricant or a special composition is used. They are applied both before starting work and during the process.

Operating procedure

The lathe allows you to quickly and efficiently form turns on any type of pipe. In order to do this you need to know how to cut a thread correctly:

1. The pipe should be clamped securely using a vice or other device.
2. It is necessary to remove the outer chamfer from the already prepared and cleaned pipe.
3. Insert a holder with a predetermined diameter into the holder.
4. Thoroughly lubricate the pipe and threading tool with lubricant.
5. The lectern is attached to the pipe in this way so that its position is perpendicular to the axis of the product. If the thread-cutting tool is installed even with a slight misalignment, then the threads may break or the value of its diameter may change.
6. The tool holder must be rotated clockwise. This will ensure that a right-hand cut is created on the product.
7. After making 3-5 turns, the device is untwisted in the opposite direction, during the process metal shavings will be removed.
8. You need to rotate the tool very smoothly, and without making sudden jerks.
9. It is important to remember to periodically lubricate the cutters and the internal surface of the joint with lubricant.
10. After the last turn is created, the lerka returns to the top, and then goes through the finished turns again.

Please note that the connection length should not be more than 10 mm. This distance is standard for the vast majority of residential piping systems.

Source: https://trubypro.ru/soedinenie/rezbovoe/narezat-rezbu-lerkoj.html