Thread pipe 1 2
Description of the thread and its parameters
This is a helical groove that is cut into a round or tapered surface. It is characterized by the following constant parameters: distance between turns, constant geometric shape of the groove, cutting depth. Used to obtain detachable threaded connections in various mechanisms and designs.
The thread can be external or internal. An external thread is cut on the surface of the pipe or rod. Internal runs inside the hole. This can be the inner wall of a pipe, couplings, nuts or other plumbing devices.
Internal threading with a tap and a knob
- Step. The distance between adjacent peaks or troughs. Measurement is taken along the threaded axis.
- Depth. This is half the difference between the outside and inside diameters.
- Profile. When threading pipes, a triangular profile is often used. In various mechanisms and kinematic schemes, a trapezoidal, rectangular or round shape is used.
- Profile corner. Depends on its height and step.
- Thread cutting length.
Die cutting with ratchet holder
In the case when it is necessary to cut a thread on a pipe located close to the wall, where it is difficult to fix it motionlessly, use a special die. It has a long body to center the cutting bar and a ratchet to rotate it.
The ratchet holder is equipped with a heavy body with 3 compartments. A die is installed from below and fixed with bolts. In the middle there is a ratchet mechanism with a pivoting arm. The switch for the mechanism of rotation clockwise or counterclockwise is also installed here.
The upper part is a cylinder for centering the device. It is equipped with three bolts, the axes of which are located at an angle of 1200. By rotating the bolts, the cutting mechanism is centered to the required diameter and the fixture is fixed on the pipe.
In the Russian system of standards, GOST 6357-81 is standardized, according to the international standard it is designated BSPP. All dimensions are in inches. Pipe threads are cut on fittings, taps, nuts and other plumbing fixtures.
The main characteristics of a cylindrical pipe thread:
- the letter G is used for designation;
- the size of the conditional passage is measured in inches;
- the angle of inclination of the profile is 550;
- four values of the step, the size of which is related to a certain diameter;
- the largest diameter of pipe threads is 6 inches, larger pipes are connected by welding.
We bring to your attention a table of correspondence of pipe thread parameters.
The table shows the most commonly used inch thread diameters for piping systems.
The designation G 1 1/4 “is deciphered as follows. straight pipe thread, right-hand, nominal diameter of one inch and a quarter. The designation may contain the letters A, B, C, which indicate the accuracy class, LH. left-hand.
This is the most common type. Its parameters are determined by GOST 9150-81. It got its name from the use of the metric system in the characteristics. Diameter is given in millimeters. It has a triangular shape and a constant profile angle of 600. The designation of a metric thread begins with a capital letter M, then the diameter is indicated in mm, for example, M20.
Metric threads have a coarse pitch and several small ones. A large step is not indicated in the designation, its size corresponds to the diameter. A small step is a certain value, which is given in the designation. Metric threads are more often right-handed, if the left-handed option is used, the letters LH are added to the designation.
Standardized by GOST 6211-81, international BSPT standard. Characteristics such as cylindrical threads are taper cut with a slope of 1:16. Provides a tight sealed connection of individual nodes of the pipeline system. The external thread is designated R, the internal thread is Rc. The letter abbreviation is followed by the nominal size in inches.
Instructions for threading using a die
A die (lerka) is a metal disc with a circular petal hole located in the center. The petals have cutting edges that cut threads to a specific size and shape. The dies are made of metal that is harder than the pipe material. It is high speed or alloy steel.
- Pipe preparation. cleaning from dirt, degreasing the surface.
- Fastening in a vice. When working at the location of the pipe, use a gas wrench.
- Removing the end chamfer. The pipe should be cut at right angles to its axis. The chamfer is removed with a grinding wheel or file.
- The cutting place is lubricated with technical oil.
- A die is inserted into the holder, the screws are tightened, ensuring its fixation.
- The die is brought closer to the end of the pipe perpendicular to the axis, without skewing. Smoothly pressing, rotate the die clockwise. The first grooves will help to fix the instrument, then the process will go easier.
- The work is carried out slowly, with even effort. Higher speed will not speed up the process, but it may degrade quality. The correct parameters are obtained by passing the cutting edges along the entire length of the die.
- Prevent the absence of lubricant on the cutting surface; if necessary, spray with oil from a sprayer.
- After receiving a threaded mowing line of the required length, the die is twisted and removed, the surface is cleaned of shavings using a rag, brush or brush with a soft bristle.
The job can be done in two stages. First, a rough die is used, then the finishing is carried out. The principle of operation corresponds to the above.
Instructions for threading water and heating pipes
Steel pipes when installing a water supply or gas pipeline in an apartment have not lost their popularity. The question remains relevant. how to cut a thread on a pipe in order to ensure a reliable connection of individual elements of the system. There are various ways that we will dwell on in more detail.
Method # 2. slice cutting technique
Klupp is a kind of the same die for threading, including on pipes. A distinctive feature of the die-cutter is the ability to adjust the incisors.
There are plugs for manual use, as well as similar devices with an electric drive.
Option # 1. cut with a manual die cutter. Cutting on pipes by hand, as a rule, is done with a die, which is installed in a ratchet holder. This holder makes pipe threading easier and less difficult.
Of course, depending on the conditions for performing plumbing work, other types of manual holders can be used. For example, a standard locking knob with two handles.
The principle of creating a thread with a die is almost similar to the method of working with traditional dies:
- Clean the working surface of the pipe, make sure there are no defects.
- Sand the cut area to a look with a pronounced metallic sheen.
- Process the outer working part of the end edge at an angle of 45-60º (chamfer).
- Lubricate the prepared surface with petroleum jelly.
- Clamp the pipe in a mechanical vise or hold it with a gas wrench.
After these procedures, the cutting tool (klupp) is placed with an internal hole on the chamfer of the pipe and, with moderate uniform pressure, they begin to rotate it with short reciprocating movements.
If a ratchet lock is used as a holder, only straight-forward cutting is performed. It should be noted the convenience of using the ratchet lock when working in cramped conditions.
For example, when it is required to process a pipe laid in the immediate vicinity of a wall.
Option # 2. cut with an electric die. Along with hand tools, devices with an electric drive are widely used. The obvious advantage for the locksmith is a significant reduction in labor intensity.
But on the other hand, not all electric machines are capable of ensuring the production of work in cramped conditions. In addition, when working with a hand tool, it is possible to get a better result.
A wealth of experience with this tool is required to obtain a similar result from electrical die sets.
- Pipe surface preparation in the cutting area. cleaning, chamfering, lubrication.
- Fastening the pipe with devices capable of providing rigid fixation.
- Fixation at the starting point of the die holder with the clamp included in the kit.
- Checking the stroke and direction of rotation of the die.
- Cutting the first two or three turns in the jogging mode.
Further, pipe threading is carried out in automatic mode. The cut length is considered optimal when the upper edge of the die cutter heads reaches the leading edge of the pipe.
At this point, the action of the device is stopped, the reverse rotation function is turned on and the bug is twisted from the pipe by jogging. Be sure to periodically wet the cutting area with oil throughout the entire process.
How to thread a pipe: a detailed overview of the main methods
Do you like to do home improvement work with your own hands, without involving various craftsmen for this? Self-installation or repair not only allows you to save money on calling specialists, but also greatly increases your self-esteem, because it is true?
In the process of installing 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 a thread using different tools, which method is preferable to use in a given situation. The article discusses the methods available for implementation to an unqualified performer. The features of cutting different types of threads and the equipment used in this are highlighted.
The presented material is provided with visual photographic materials depicting the tools for performing the work. A video with recommendations will help you to understand in detail all the intricacies of this process.
Basic cutting methods
You can cut threads on pipes in one of two ways:
- automatic. on machine tools, power tools;
- manually. using a hand tool.
For everyday life, of course, manual technology is more relevant. Tapping water pipes or other pipes by hand is often done with a die.
Die is a simple pipe threading device at home. The same tool is successfully used on industrial machines.
The fixture looks like a disc with several axial holes drilled along the inner diameter. The edges of these holes form several incisors (usually 8-10). The material for the dies is alloy steel or other hard alloys.
There are several types of such devices:
- spring loaded (split);
- kluppovye (sliding).
According to the form of execution, the die is produced in the form of a circle, square, hexagon, prism. The most common are disc (round) instruments. They are used for threading water pipes up to a diameter of 36 mm.
For the convenience of working with dies, use:
- simple knobs with locking screws. hand tools;
- tapping chucks on lathes.
Threading (metric, tapered) of the best quality on pipes in manual mode or on machine tools is given by solid dies.
However, this type of tool, due to the rigidity of its own design, has its negative aspects. Cutters wear out quickly.
Spring-loaded (split) dies have a less rigid design, which makes it possible to cut threads on pipes and at the same time change the thread diameter in the range of 0.1-0.3 mm.
Such devices are characterized by increased wear resistance of cutters, but they do not provide high accuracy and cleanliness of thread cutting.
Sliding dies consist of two working parts. They are designed for installation in a fastening module. klupp.
Fastening in the die is carried out by a mechanism consisting of a cracker and an adjusting screw. The screw adjusts the size of the diameter for threading. Usually the die is equipped with a set of dies for several different diameters.
Pipe thread classification
The term “pipe” has a privileged position in the field of plumbing. This term is classified with an eye to a group of standards that determine the criteria for the connections of various elements of plumbing structures.
For example, pipe thread size is indicated by a numerical value that indicates the pipe bore standard, 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 conical (American standard NPT).
It is recommended for a locksmith, whose main working area is household facilities, to take as a basis the conditional division of pipe threads into two main types:
- cylindrical (G),
- conical (R).
It is with these two types that a home locksmith who serves household plumbing equipment, who lays water supply or heating pipes, most often has to deal with.
Pipe cutting is performed in the following cases:
Method # 1. making pipe threads with dies
The process of creating a thread on a pipe with a die or chuppa involves the execution of some preliminary actions by a locksmith:
- The pipe surface in the cutting area must be thoroughly cleaned.
- The end of the pipe should be filed (make an entrance chamfer).
- Apply a lubricant to the surface to be treated to reduce drag.
If possible, it is advisable to fix the pipe vertically, for example, in a locksmith’s vice, leaving free access to the upper part. the cutting area. The strength of the fastener must be correctly calculated so as not to deform the pipe bodies.
Then they take a pre-prepared knob with a roughing die of the required diameter and suitable thread characteristics.
The tool is held horizontally. perpendicular to the end area of the pipe. Slide a rough block with an inner hole on the edge chamfer. With light pressure and successive short turns of 25-30 °, an initial incision is made.
This work should be done carefully, without haste, constantly monitoring the right angle between the horizon of the die and the vertical of the pipe.
With this technique, the first two or three threads are carefully cut. Usually, after cutting the first two or three threads, the tool is firmly in the working position. Further, the right angle can no longer be controlled.
But the technology of cutting with short (without particularly strong traction) circular movements should be maintained until the end of the cut. It is recommended to periodically add grease at the cutting point.
After the first pass, twist the device and then repeat one or two more times already with a finishing die
Method # 3. using lathes
Large-scale construction and repair work, as a rule, excludes the use of hand tools. Here, lathes are usually used to process the pipes appropriately.
Threading functions are supported by many universal lathes.
With the help of the machines, both internal and external pipe threads are efficiently and easily made. The fastening pneumatic (or mechanical) module of the lathe provides a high-quality reliable fastening of the pipe, and an accurate approach of the workpiece to the cutter.
To perform threading functions, different types of cutters are used:
Work on lathes is carried out by specialists trained in this matter and having the appropriate qualifications. Without experience and professional skills, it is not recommended to try to cut threads with your own hands on a machine.
For home craftsmen who decide to do plumbing and make carvings on metal blanks, the following tips will help in their work:
Manual die set
An electromechanical threading kit called “klupp” is used in conjunction with a set of radial dies of various diameters designed for threading on pipe workpieces of any dimension. In addition to the device itself, you will need the following tools and materials for threading:
Immediately, we draw your attention to the fact that working with an electric sander is allowed only with gloves and protective glasses.
Near the wall
The principle of threading is no different from the usual situations described above. The only difference is that it is extremely inconvenient and problematic to carry out these works near the wall. For example, sometimes it is necessary to slightly hollow out a section of a wall near a pipe. It is very important to cut carefully. If it is uneven, then there will be difficulties when cutting, and given that you have already made a depression in the wall, it will be extremely difficult to cut a thread. You can use a plate to accomplish this task. First lubricate the pipe and the die, and then start cutting the branches.
If the pipe near the wall has a large diameter, then the task of threading becomes more difficult. In such circumstances, it is necessary to use not a die, but a klupp. For convenience, it is better to use an electric die.
Thread cutting techniques
The technique of threading on pipe blanks involves the use of the following techniques:
- use of special threaded combs and cutters;
- thread rolling by means of round (flat) dies;
- preparation of a threaded connection using “classic” taps and dies;
- threading with special cutters.
Thus, the preparation of threaded connections at home is possible only with the presence of certain devices and tools. In this article, we will consider in detail the method of threading using a special threading kit (the so-called “kluppa”).
How to thread a pipe
- 1 Techniques for threading
- 2 Instrument composition
- 3 Procedure for cutting external threads on a water pipe
- 4 Cutting an internal screw connection
- 5 Near the wall
- 6 On a stainless pipe
- 7 Videos
Self-threading on pipes of various classes requires the performer to have certain skills and knowledge of all the intricacies of this procedure. In this article, we want to acquaint you with how to thread a pipe with your own hands (on a water pipe, on a stainless pipe).
Mastering the threading technique will allow you to independently repair water supply and heating networks, as well as any household appliances that include tubular products.
Before threading a pipe in its inner cavity, you will need to measure the diameter of the pipe hole. Based on the data received, you can choose a working tool (tap) of the required size. Pay attention that the length of the pipe section protruding from the wall is several millimeters longer than the threaded part to be cut.
After you have finally decided on the required diameter of the inner hole, you should re-drill it to a size suitable for threading.
In the process of reaming, you need to carefully monitor the position of the inserted part of the drill, which should not deviate from the vertical.
Upon completion of the preparatory operations, a tap of the required diameter is inserted into the pipe hole with a simultaneous clockwise rotation of its base. Rotation is carried out using the so-called “knob” included in the tool kit.
The procedure for preparing an in-line thread involves the use of the following working tool:
- tap under the designation, intended for preliminary (rough) “run” of the thread. The design of this tap is such that when using it, up to 70% of the material is removed;
- tap used for final (finishing) threading. With its help, the remaining 30% of the pipe material is cut off.
Thus, to obtain a high-quality and full-fledged thread, you first have to “walk” along the inner cavity of the pipe with a tap, and then repeat the same operation using a tap. All these works should be accompanied by the introduction of small portions of machine oil into the working area.
The procedure for cutting external threads on a water pipe
We make carving
How to Thread Pipe; A Beginner’s Tutorial
First of all, using a grinder, a part of a water pipe with an old thread or a section of it damaged by corrosion is cut off.
To form a high-quality cut, which guarantees the convenience of carrying out all subsequent operations, immediately after marking, the pipe section is rigidly fixed with a gas wrench or clamped in a vice. Further, a thin chamfer is cut off in the pipe section to be prepared, which greatly facilitates the rotation of the die. To facilitate its sliding along the thread, the cutting section is lubricated with machine oil.
In the process of threading, the die holder rotates clockwise; but after the formation of several threads, the direction of its rotation is reversed. Using this technique allows you to free the working area from waste metal shavings.
The length of the threaded connection should not exceed 1 cm, which corresponds to the standard value for most household piping networks. At the end of the threading procedure, the treated area is cleaned of metal shavings, and then thoroughly wiped with a rag or rag.
On stainless pipe
When it comes to threading stainless pipe, the task is complicated by the fact that the metal used is quite hard. Therefore, the appropriate steel grade of the die should be selected for cutting. In this case, marking P18, or better R18F2, would be a suitable option. The letter “F” means that the material contains a regulating additive of vanadium up to 2%. In addition, P9 dies can be used for threading stainless pipes.
If you pick up a die of an inappropriate brand, then as a result you can be left without a die and without a thread. In some cases, threading is possible only on the shaft with a cutter.
How to properly thread a pipe with a die
If you are repairing plumbing, changing the water supply, then you need to know how to properly cut the threads on the pipe with a die in order to screw on the tap, the coupling, and the safety of repairing your apartment, as well as the neighbors below, depends on the correct threading.
I already described the threading process itself in the article “How to connect a heating radiator”, but according to questions from readers of my blog by mail, I decided to describe in more detail how to do this.
In order to cut a thread, you will need the following tool:
- die holder, lerka
- dies for cutting a rough thread
- finishing die
- grease, machine oil or lard
- angle grinder or file
Also called dies. first pass and finish.
For which I advise you to use two dies:
Firstly, it is easier to cut, and secondly, the wear of the tool decreases, and with the current quality, this is very important, since now you will cut 3-4 threads, and the die can be thrown out.
If you cut a thread on a water or heating riser, or a tie-in for an apartment, be sure to make sure that it is in good condition, otherwise you risk breaking the pipe.
How to thread a pipe
When the pipe was cut to size, on the side where you will cut the thread, be sure to remove the chamfer, you can also clean the very place where the thread will be a little, if there is paint on the pipe, then it is better to clean it, it will be easier to cut the thread.
Lubricate the thread and the teeth of the die with grease or lard.
Take a die holder with a 1-pass die, or a threading tool for a rough thread of a clerk (pictured) and pressing it with your hand with force (so that the die catches on the pipe and starts cutting), start cutting clockwise, approximately 5 turns. After about the 2nd turn, when it goes tight, turn back half a turn, this will break off the chips, and it will be easier to cut, and turn clockwise again.
When the rough cut was cut, we take the 2nd die, again grease the thread, the die for the fine thread, and repeat the same steps.
Do not buy taps in which the internal thread is 3.5 turns, even if they are thick-walled, such valves can be screwed onto fittings with brass threads, for a water supply, iron pipe, they are not suitable.
Be sure to cut the first through thread with a guide, so that the thread does not go into distortion.
If you cut the finishing thread without a guide, carefully watch that the die winds 1-1.5 turns evenly, without skewing.
Tip: cut at least 5 turns, and be sure to screw the tap on the bare thread, and count the number of turns, it should be 5, when installing the ball valve on an iron pipe with flax, you must wind at least 4.5 turns. So do not be lazy, if the tap is screwed in fewer turns, be sure to cut the thread. If you wind it by 2-3, then after a short time 1-2 turns will rot away, and the tap will fall off, and there will be a flood. How to properly wind flax on a thread, read here.
Here is such a process and tips on how to properly cut a thread on a pipe with a die with your own hands, you can watch the video.
Thread cutting techniques
The technique of threading on pipe blanks involves the use of the following techniques:
- the use of specialized threaded combs and cutters;
- thread rolling with round (flat) dies;
- preparation of a threaded connection using “traditional” taps and dies;
- threading with specialized cutters.
Likewise, preparing threaded connections at home is only possible if specific devices and tools exist. In the publication recommended for you, we will consider in detail the method of threading using a special threading kit (as they say otherwise, “kluppa”).
Self-threading on pipes of different classes will require special skills from the performer and knowledge of all the nuances of such a procedure. In this article, we want to acquaint you with how to cut a thread on a pipe with your own hands (on a water pipe, on a stainless steel pipe).
Mastering the threading technique will give you the opportunity to repair water and heating networks without outside help, as well as any home appliances that include tubular products in their own composition.
The procedure for cutting external threads on a water pipe
First of all, using a grinding machine, a part of a water pipe with an obsolete thread or a section of it damaged by corrosion is cut off.
To obtain a good cut, ensuring the convenience of all further operations, immediately after marking, the squeegee is rigidly attached with a gas wrench or clamped in a vice. Further, on the prepared section of the pipe, an elegant chamfer is cut off, which significantly makes it easier to rotate the die. For ease of its sliding along the thread, the cutting section is lubricated with machine oil.
In a threading procedure, the die holder rotates clockwise; but after the appearance of several threads, the purpose of its rotation is reversed. The use of this technique will free up the work area from waste iron shavings.
The length of the threaded-type connection should not be more than 1 cm, which is suitable for a common indicator for many household pipelines. At the end of the threading operation, the machined area is cleaned of iron shavings, and then gently wiped with a rag or cloth.
Next to the wall
The principle of threading is no different from the ordinary circumstances described above. The only difference is that it is very uncomfortable and difficult to do these works next to the wall. For example, periodically it is required to gouge a section of the wall near the pipe a little. It is also important to carefully cut. If it is crooked, then there will be difficulties when cutting, and if you consider that you have already made a depression in the wall, it will be very difficult to cut the thread. To perform such a task, you can use a plate. Grease the pipe and the die in advance, and then start to cut the branches.
If the pipe next to the wall has a very decent diameter, then the task of threading is difficult. In such circumstances, it is necessary to use not a die, but a klupp. For comfort, it is better to use an electric screwdriver.
An electromechanical threading set called “klupp” is used simultaneously with a set of radial dies of different diameters, which are designed for threading on pipe workpieces of any dimension. In addition to the device itself, you will need the following materials and materials for threading:
- Taps for fast tapping of internal threads.
- Mechanical vise used for fixing tube blanks.
- Grinder for preparing threading areas.
- Lubricating oils.
It is also worth drawing your attention to the fact that working with an electric grinding machine is allowed only with the existence of gloves and goggles.
Tapping pipes and fittings.
Pipes and fittings (pipe fittings) are cut with a special tool using tools.
Fresh (new) thread in front of the water meter
During the initial installation of water meters in the water supply system, it is necessary to install a shut-off ball (ball) valve (if it was not installed), or it must be replaced (in case of dilapidation or failure), we talked about its choice and installation in one of the previous articles A threaded connection is used to mount the valve to the pipes. You have to cut the thread on the pipes
We are completing a series of articles about the elements necessary for installing a water meter in your home. Let us remind you that during installation you need to install:
The last element will be discussed in this article.
In accordance with GOST 6111, pipe threads are used in detachable pipe connections designed for pumping liquid and gaseous working media.
Why do you need a thread at all?
We seem to have sorted out the two most popular options for threading a pipe, but a logical question may arise about why this is necessary at all, if almost all pipelines today are made of plastic of various types, at least in everyday life? The answer is very simple. you can connect a metal pipe and a plastic one only by means of a threaded connection, and nothing else. And such designs are still found in an individual dwelling very often.
In order to cut threads on screws with diameters up to 6 mm, screw boards are used. The screw boards have several cut holes of different diameters with flutes for shavings, two for each hole.
Dice tapping is performed in the same way as tapping. The rod is firmly clamped in a vice, lubricated with oil, and then a die with dies is put on the rod, clamped with a screw and rotates a full turn in one direction and half a turn in the other. If the rod is thicker than the required one, it must be filed with a file.
Bolt threads are measured with ring thread gauges or a thread gauge.
Cutting with prismatic dies is somewhat different from cutting with lers. When cutting with dies, the rods are not cut into a cone, but the dies are moved apart. Then they are clamped on a rod, the end of which must coincide with the upper plane of the dies. By turning the die to the right and slightly to the left, the thread is cut. The position of the holder and the die is set strictly perpendicular to the rod to be cut, otherwise the thread will be oblique and one-sided.
For manual threading of pipes, two types of devices are used: dies (levers) and klupps.
A manual die (die) as a tool for cutting pipe threads is a device consisting of two parts. the working part itself, and a body (die holder), equipped with two handles, with which the die rotates along the outer diameter of the pipe.
Convenient to use is a set of threads on pipes manually, which consists of several sets of dies of the most common diameters. This is explained by the fact that for a high-quality connection, a rough die should be used for the initial pass, and a finishing one of the same diameter for the purpose of profile calibration.
You can, of course, use one lerk, but its wear in this case will be much higher, especially if the pipeline is made of high-carbon steel.
In contrast to the cutter, the cutting die is a more structurally complex tool. It has a ratchet that locks the threading part in a certain position while the handle is turned the next turn. Therefore, the thread is of better quality.
In addition to the manual threading tool, in practice, a mechanized tool is also used to obtain pipe threads. The most compact and easy-to-use thread cutting machine is equipped with an electric drive. However, in this case, the price of the issue turns out to be much higher, therefore, electric thread cutters justify themselves only when it is necessary to form threads on a long section of the pipe.
Round dies thread cutting.
Round dies (dies) are a disc with a cut hole. For the removal of chips and the formation of feathers with cutting edges, several chip holes are made in the die. Dies (sticks) are inserted into the stick holder and clamped with screws
frame; 2. handle; 3. clamping screw.
The diameter of the rod to be cut is taken slightly less than the outer diameter of the thread and is sawn in a cone-like manner for the entry of the rod. The choice of rods for cutting metric or inch threads is given in table. one:
Table 1. Diameter of rods for threaded bolts.
|Metric thread||Inch thread|
|Outside diameter in mm||Bar diameter in mm||Outside diameter in inches||Bar diameter in mm|
Sliding dies (Fig. 3, a) consist of two prismatic halves with a cut hole. In the middle of the hole, the dies make a groove that forms the cutting edges.
I cut a thread on a pipe with a stick or a die.
For threading on a pipe with a diameter of 15 (aka 1/2 ″, aka half an inch), I usually use a lerk holder, which I put on the prepared pipe cut, with the side that has edges, due to its length, it acts as a guide, which is important for uniform engagement with a scraper. I lightly press down on the end with my hand and rotate over the edges with an adjustable wrench, clockwise.
It is not always possible to use the guiding side, this is due to the fact that for some reason the pipe cut was made very close to the tie-in into the riser, then the entry is made from the side of the bench. In this case, you need to be more careful, keep the stick perpendicular to the pipe axis, otherwise the thread may go crooked and the fourth coil will push the pipe through and through. Actually, if the chamfer is removed along the entire diameter evenly, then the entry will go exactly, respectively, and the entire thread.
You can also cut a thread with a die, but usually a pipe of this diameter is used for routing, and it is not possible to use a knob due to its massiveness.
On a pipe with a diameter of 20 (aka 3/4 ″, aka three-quarters of an inch), I cut the threads with a die, although just in case I have a three-quarter cutter in the holder. For the same reasons as in the above paragraph.
And pipes with a diameter of 25 (aka 1 ″, aka inch) and a diameter of 32 (aka 1 1/4 ″. She is an inch and a quarter), I cut only with klups with a ratchet wrench. This is due solely to the complexity of this work. Using kluppa, the process is much simpler, easier and faster.
In the photo, in addition to the lerka and screw plugs with a knob, I presented what I use for the tightness of the threaded connection, namely, universal, plumbing sealant and plumbing flax. After I cut the thread, I put a sealant on it, trying to distribute it evenly over all the turns, and after that I wind the flax, I talk about this (and show) in detail in another article, I will leave the link below.
How to Thread Pipe EXTREMELY FAST
Connections are not only threaded.
In my profession, I have to combine polypropylene with cast iron when installing a sewage system. Basically, this connection is carried out by means of a transitional rubber cuff, which, by coating with sealant, is inserted into the socket of a cast-iron pipe or fitting, and already into it you insert a fitting or a polypropylene pipe coated with sealant. Due to this, the connection is tight.
The photo shows a bobbin, different in thickness, it is also used when installing the sewage system, by ramming it into the gap between the materials described above. The use of a bobbin is convenient because you can dissolve it and choose a strand of the required thickness. Its use is relevant in the case when the transitional cuff does not fit in size, such cases are not common, but still occur.
klupp. pipe threading tool:
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