How to thread a die without a die holder

The quality of the tools used

On sale you can find dies made from a wide variety of alloys. The following metals can be used in the manufacture:

  • High-speed steel 9ХС and ХСС, Р6М5. Today it is found on the market more often than other steels. This is due to its exceptional performance and relatively low cost. R18 steel is less commonly used, which was widespread at the time of the existence of the USSR.
  • The quality of a tool largely depends on the accuracy of its production. If the accuracy of the shape is low, or there are defects on the surface, then this indicates poor quality of the tool.

Die holders

To cut a thread, one lerka is not enough. You will also need an auxiliary device for clamping and holding the die body. a die holder.

One device is designed for several standard sizes at once. for small, medium and large threads. The die is installed inside the holder and fixed with a screw.

Design

The first feature that distinguishes one lerk from another is the design of the body. In accordance with this, there are:

  • Round dies. The body is a solid ring through which the workpiece passes. Due to the high rigidity, a high-quality thread with a good thread profile is obtained.
  • Sliding dies, consisting of two parts, are designed to obtain threaded surfaces of various diameters.
  • Split. the run-up of thread diameters is 0.1-0.3 mm. Therefore, it is advisable to use them for inaccurate threads.

How to cut threads by hand

Threaded connections are widely used in the device of various mechanisms and machines. Bolts, studs, screws, nuts are versatile, interchangeable fasteners. However, there are times when you need to cut threads by hand. A specialized tool will help to perform this work qualitatively.

  • External threading with a die
  • Tapping internal threads

In mechanical engineering, there are three main systems of fastening threads: metric, inch and pipe.

Metric thread is the most widespread. It has a 60 triangular profile. Its main parameters, diameter and pitch, are expressed in millimeters. Example of designation: M16. This means that the thread is metric, has a diameter of 16 mm with a coarse pitch of 2.0 mm. If the step is small, then its value is indicated, for example, M161.5.

Inch and pipe thread diameters are expressed in inches. The pitch is characterized by the number of threads per inch. The specified parameters are standardized, so there is always an opportunity to choose the necessary tool.

How to cut a thread with dies

Threading with taps and dies is not tricky if you know a few nuances.

Choose from a set of dies the size that will correspond to the diameter, pitch, direction and type of thread. Prepare the part for cutting. File off a small chamfer (blunting) at the end with a file. This is necessary for better penetration of the tool. For the same purpose, you can lubricate the lead-in section with oil.

Insert the die into the holder, secure with the screw from turning. Place the tool on the part and make 2 turns, with the other hand lightly pressing on the die.

After the edges have cut into the metal, perform a rotational-translational motion (2-3 turns forward and half a turn back) to the end of the threaded section.

Always check the position of the ram holder in relation to the workpiece. It should be perpendicular, not tilted. You can check the correctness of the cut thread by screwing with a counterpart or using a thread gauge.

How to cut a left-hand thread with a die?. Metals, equipment, instructions

For cutting external threads, a die can be used, which is called a stick. Typically, threading dies are designed for cylindrical surfaces. There are just a huge number of different types of this tool, they all have their own specific characteristics.

Threading | School repair

For threading you will need. a pipe clamp and a wrench with a set of dies. You can see the thread cutting process using this kit in fig. 89.

a. preparation of a pipe section of the required length; b. chamfering under the plate; c. threading

Dies are selected depending on the required type of thread and its diameter. In order to understand what kind of plate you need, you need to look at its end on which it has a stamp, which contains all the necessary information. In this case, pay special attention to the designation of the thread and the grade of material (steel) from which the die was made.

Most often, an inch cylindrical thread is used to connect the pipeline. On the stamp you can see the letter designation, for example, if the letter “L” is in the stamp, it means that the die has a left-hand thread.

The steel grade from which the die is made is worth paying attention to if you need to cut a thread, for example, on high-strength stainless steel.

In order to cut threads on high-strength stainless steel, you will need a die marked P18 or P9, or even better P18F2. The letter “F” in the marking denotes 2% vanadium in tool steel as an alloying addition.

In addition, the dies are split and continuous. The first ones make it possible to perform work with greater accuracy, that is, with their help, the thread can be passed in several passes. In this case, the thread diameter should be corrected with the locking screw.

thread, holder

When installing the pipeline, you should work with split dies of the corresponding diameters, since they allow you to thread with a run. Also, for threading pipes, sliding dies are used, fixed in special oblique plugs with numbers from 1 to 6.

Also, depending on the type of connection used, a certain type of thread is performed.

Thread direction

Threads can be right-handed (threads cut clockwise) or left-handed (counterclockwise). Dies are also distinguished:

  • Rights. Used for threading on bolts, axles, screws.
  • Left. They are used relatively less often in specific automotive elements, rotary mechanisms and where the right-hand thread will unwind. On the photo of the dice you can see the marking of the Latin letters “LH”.

How to cut a thread with a die?

If you need to manually cut external threads for a pipe connection, make a stud or a bolt for a nut with a metric thread, a simple but rather effective tool is most often used. a die. The thread preparation process is quite simple if you follow the instructions below exactly.

Preparing for die tapping

Before cutting a thread with a die on a rod or pipe, you must select a tool of the required diameter and pitch. The die itself is a nut with conical cutting teeth with holes for fastening in the wrench. Dies can be solid, split, sliding, have a round, square or hexagonal shape.

First of all, it is necessary to select the material and tool of the required diameter. Below is a table of correspondence of the most popular diameters for metric, inch and pipe threads with an example of the selection of a workpiece for an M6 thread

Quick Bits: Die thread cutting trick

As you can see from the table, for threading M6 we need a rod with a diameter of 5.8 mm. For higher thread diameters, there is an allowable minimum and maximum value for the thickness of the rod. It cannot be violated. if the diameter is exceeded, you risk breaking the die, if the value is less than the minimum, you will get a weak thread.

Before you start cutting an external thread with a die, in addition to the tool itself and the workpiece, you need a wrench of a suitable shape and size, as well as machine oil. After that, you can proceed directly to the cutting itself.

Thread cutting order

Before starting cutting, the outside of the pipe or workpiece must be chamfered at an angle of 45 °. This is necessary to facilitate the first turns and fix the die.

  • Secure the pipe or workpiece in a strictly vertical position. The best option to avoid distortions is a locksmith vice, but you can also use a gas wrench.
  • Lubricate the tool with oil.
  • Place the die on the head of the rod in a perfectly horizontal position and start with the first few circles.
  • If there is an obvious bias on the first circles, remove the die, tap the workpiece and start over.
  • When turning on the first turns, simultaneously press down on the knobs of the wrench evenly to start the cutting process.
  • After the first few turns, check that the cut is correct. This can be done by the horizontalness of the die and the wrench, which can be checked with a level. Further, with the correct position of the tool, you can continue cutting pipe threads with a die to the entire required length.
  • When reaching approximately the middle of the length, the pressing force can be weakened, then the self-tightening process begins.
  • After one or two turns, it is necessary to turn the die half a turn back to remove the chips.
  • After cutting to the desired length, simply return the tool back to the finished thread.
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It should be noted that the die can have several numbers, most often 2. In this case, after cutting the rough thread, it is necessary to alternate through each of the numbers for the final formation of the thread profile.

Selection of the diameter of the workpiece when cutting external threads

The correct choice of the outer diametrical size of the original workpiece is a guarantee of the quality of the resulting thread. Cutting threads (both external and internal) on the surface (in the hole) is possible only if certain requirements are met. So that the die does not break and does not jam, the cylinder diameter should be several tenths of a millimeter less than the nominal thread. In the process of cutting, the metal will be squeezed out to some extent and filled in the shape of the die, so that the gap will be minimal.

Internal threading technology

The shaping tool in this case is the tap. How to cut threads with this tool? In principle, it is also quite simple: a hole with a diameter slightly larger than the diameter of the thread root is drilled in the metal, the tap itself is inserted with a shank into the knob, after which it begins to screw into the hole, cutting the thread at the same time. Outwardly, the tool looks like a bolt. It is the only one made of high-strength alloyed tool steel and has flutes for chip evacuation.

Manually cutting a thread. both with a die and with a tap. is a very difficult task, and without some experience it will be difficult to do this operation (first of all, physically). To facilitate the process, special tool kits are available. Such a set allows you to cut threads not in one pass, but in three, while using three different taps (roughing, semi-finishing and finishing).

general information

On the territory of the CIS countries there is a metric thread standard. Its angle is sixty degrees in cross section. In Western countries, an inch thread (an angle of 55 degrees) is used. This circumstance should be remembered when buying any spare parts for a car or other equipment.

Depending on the geometric shape of the thread teeth in the section, rectangular, triangular, trapezoidal and other options are distinguished.

A special type of thread is a ball screw. She found application only in machine tool construction. With intensive use, the helical surface wears out. However, the design of the ball screws allows you to adjust and eliminate the backlash.

There are right-handed threads (the most common) and left-handed threads (they have limited and highly specialized use). You can hardly find a die or tap for left-hand threading. Cutting on a lathe is perhaps the only possible way. It is recommended to use it in the absence of other versions.

External thread: how to cut into a die

The easiest and most affordable way to cut a thread on the outer cylindrical surface is to use a die. Depending on the design, the device can be round, prismatic, sliding.

The round die is somewhat reminiscent of a nut. Only the outer contour is not a hexagon, but an ordinary circle with small indentations for attaching to the knob. It differs from the nut in the presence of three grooves for the exit of chips when threading.

Round dies form threads in just one tool pass. Therefore, during their operation, it is necessary to supply lubricant to the cutting zone. The maximum thread diameter obtained in this way is 52 millimeters.

The sliding plate consists of two identical parts. They are installed in the die with a certain gap. During the work, the parts come closer.

Thread on the pipe surface

When carrying out plumbing work, it is often necessary to cut threads on the pipe. How it’s done? There are no fundamental differences. The only difference is that the pipe is hollow inside. That’s all. For these purposes, a conventional die and a knob or a screw-cutting lathe can be used.

Also, to carry out the process on the pipe surface, so-called shanks are used. In this case, you can use both sliding and solid dies.

The cutting procedure is preceded by a reliable fastening of the pipe section (in a vice or in special prisms), after which the surface is cleaned of dirt and oxides, and the burr from the band saw is removed. It is recommended to lubricate the surface with oil. Only after these preparatory operations can one proceed directly to cutting.

Surface preparation for external cutting

How to thread a bar? It should be noted that the diameter of the rolled bar must exceed the diameter of the thread by at least a millimeter, so that there is an allowance for removing blackness on a lathe. Cutting on a black untreated surface is highly undesirable: there is a high probability that the die will find a non-metallic inclusion and break.

After grooving the outer diameter on a lathe, it is necessary to groove a chamfer. This element is necessary, firstly, in order to ensure the plunging of the die, and secondly, to remove a sharp burr obtained when cutting the end on a lathe.

Sequencing

How to cut the threads correctly? This operation is performed manually in the following sequence:

  • The original workpiece is fastened in a bench vise. In this case, there should be no distortions and deviations from the vertical position.
  • The die is attached to the crank. The end of the ram must coincide with the end surface of the ram holder.
  • The first rotation is carried out with little effort: the main thing is to correctly set the direction and avoid the skew of the die.
  • After the thread has been cut along the entire length, the wrench should be started to rotate counterclockwise.

The ways

Thread. a kind of helical groove on the outer surface of the cylinder (outer) or on the surface of the hole (inner).

A die is used for cutting an external thread, a tap for an internal thread.

But this method and tool are suitable only at home or in repair production, because they require a lot of time for cutting. In the mass production of hardware (bolts), the thread is not cut, but rolled on special equipment for processing metals by pressure. In this case, it is important that the workpiece is heated to a temperature of over 750 degrees (then dynamic recrystallization and texture elimination will occur). This performance is imprecise. And therefore, for critical connections, the threads are cut.

The threaded surface can be obtained by machining on a screw-cutting lathe. For this, both a die with a tap and special turning tools can be used.

In addition, the rapid development of electronics made it possible to process threaded surfaces on turning and even CNC milling machines.

How to cut a thread with a die?

If you need to manually cut external threads for a pipe connection, make a stud or a bolt for a nut with a metric thread, a simple but rather effective tool is most often used. a die. The thread preparation process is quite simple if you follow the instructions below exactly.

Thread cutting order

Before starting cutting, the outside of the pipe or workpiece must be chamfered at an angle of 45 °. This is necessary to facilitate the first turns and fix the die.

  • Secure the pipe or workpiece in a strictly vertical position. The best option to avoid distortions is a locksmith vice, but you can also use a gas wrench.
  • Lubricate the tool with oil.
  • Place the die on the head of the rod in a perfectly horizontal position and start with the first few circles.
  • If there is an obvious bias on the first circles, remove the die, tap the workpiece and start over.
  • When turning on the first turns, simultaneously press down on the knobs of the wrench evenly to start the cutting process.
  • After the first few turns, check that the cut is correct. This can be done by the horizontalness of the die and the wrench, which can be checked with a level. Further, with the correct position of the tool, you can continue cutting pipe threads with a die to the entire required length.
  • When reaching approximately the middle of the length, the pressing force can be weakened, then the self-tightening process begins.
  • After one or two turns, it is necessary to turn the die half a turn back to remove the chips.
  • After cutting to the desired length, simply return the tool back to the finished thread.
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It should be noted that the die can have several numbers, most often 2. In this case, after cutting the rough thread, it is necessary to alternate through each of the numbers for the final formation of the thread profile.

How to thread a pipe: plugs and dies

Let’s figure out how to properly cut the external and internal threads on the pipe using die blocks and dies. Threaded joints of metal pipes are strong and airtight, and can also withstand significant pressure. And if you mount the pipes yourself, then threading will be required.

To work you will need tools and materials:

  • Vernier caliper. for accurate measurement of the pipe diameter.
  • Vise. when using solid dies or tap.
  • Machine oil or any lubricant.
  • Rags or sponge.
  • Protective equipment. glasses, gloves.

A device for tapping a thread, depending on the specific task (solid or sliding dies, electro-lugs, ratchet holders or taps).

Preparing for die tapping

Before cutting a thread with a die on a rod or pipe, you must select a tool of the required diameter and pitch. The die itself is a nut with conical cutting teeth with holes for fastening in the wrench. Dies can be solid, split, sliding, have a round, square or hexagonal shape.

First of all, it is necessary to select the material and tool of the required diameter. Below is a table of correspondence of the most popular diameters for metric, inch and pipe threads with an example of the selection of a workpiece for an M6 thread

As you can see from the table, for threading M6 we need a rod with a diameter of 5.8 mm. For higher thread diameters, there is an allowable minimum and maximum value for the thickness of the rod. It cannot be violated. if the diameter is exceeded, you risk breaking the die, if the value is less than the minimum, you will get a weak thread.

Before you start cutting an external thread with a die, in addition to the tool itself and the workpiece, you need a wrench of a suitable shape and size, as well as machine oil. After that, you can proceed directly to the cutting itself.

Application of die blocks

Unlike one-piece dies, die plates consist of two sliding parts that are fixed in the holder frame. The thread diameter is adjustable. The advantage of die dies is the purity of the resulting thread and increased structural strength.

When working with die-cutting tools, less effort is required than when using conventional dies; in some modifications, the use of a vice is not required. The dies have special guides that simplify the work process and prevent distortions typical for threading with a solid die.

To facilitate the work, the klups can be equipped with ratchets. A ratchet wheel is located on the bottom of the heads for interchangeable dies of such tools. When the wheel is turned, the head rotates. The disadvantages of systems with dies include higher cost than solid dies, as well as significant weight.

The sequence of actions when using a die plate:

  • Fixing the pipe in the clamp, while its protruding part should be short, since a long section can bend when cutting.
  • Insert the die into the holder, and the edge of the pipe into the guide.
  • Lubricate pipe and tool.
  • Cut the pipe by rotating the die. Rotate it counterclockwise periodically to free the grooves from chips.

A more expensive, but at the same time quite convenient solution is the electro-lug. However, in terms of economic feasibility, the purchase of such a tool is only needed if pipe threading is performed frequently.

Electroklupp works by means of an electric motor. As a rule, the tool is completed with high quality tool steel. The dies are inserted into the replaceable head. Klupp of this type allows you to cut threads extremely quickly and efficiently.

  • The appropriate head with cutters is selected and fixed in the power drive of the tool.
  • The pipe is fixed in a special clamp and tightened with a holder. The clamp is fixed on the body of the electrocuppa.
  • The contact zones of the dies and pipes are treated with a lubricant.
  • After pressing the start button, threads are cut in seconds.

How to make an internal thread

If an internal thread is required in the pipe, a tap is used. a screw of the corresponding diameter with cutting edges and grooves for chips. The tail of the screw is fixed in the wrench.

For work, two taps are quite enough. roughing and finishing. The use of a rough tap will allow you to process about 70% of the material along the depth of the thread, the rest will fall on the finishing tap. Nevertheless, in some cases, the set of tools will have to be increased. to work with titanium pipes, you will need up to five taps.

The selection of a specific tap is made after measuring the diameter of the inner cavity of the pipe. The length of the section protruding from the wall should be several millimeters longer than the cut section. Cutting should only be done with lubricant. The working area must be cleaned of foreign particles and deposits.

After installing the tap in the hole, it is necessary to check the strict alignment of its position with the pipe axis. If that’s okay, you can start cutting the pipe. Directly the threading stroke is carried out in the same way as it is done with a die.

Preparation for work

First you need to select and, if necessary, cut off a suitable piece of pipe with an angle grinder or a hacksaw for metal. When cutting, you need to check that the cut is strictly perpendicular to the planes of its walls.

Immediately before threading, clean the pipe surface from rust or old paint and other foreign deposits with sandpaper and a file. In addition, the end of the pipe must be chamfered with a file in order to make the thread easier. Now let’s move on to preparing for threading.

  • the pipe diameter does not match the thread diameter;
  • using an incorrectly centered, rusty or blunt tool;
  • working without lubrication of the tool and pipe leads to cracks or disruption of the threads;
  • excessive physical effort as a result of a complete lack of work skills leads to thread breakage.

GSR dies for external threading.

GSR dies for external threading.

There is nothing more annoying than tapping and breaking your tool. Therefore, in our blog post today, we would like to introduce new die guides that are used for tapping external threads.

Who doesn’t know. cutting the perfect male thread is not an easy task. The hardest part of this is to start tapping the dies perpendicular to the bolt. If this does not happen, then both the bolt and the die can be damaged by oblique cutting. the thread will be damaged.

When tapping an external thread, the “oblique nozzle” of the dies causes bad threads or tool breakage.

Easy to cut perpendicular external threads with GSR dies.

The advantages of using guides are obvious:

Threads are cut perpendicularly. regardless of whether the bolt has been aligned or not.

Threaded flanges cut cleanly and neatly.

Using the GSR die guides. you always ensure that the cutting direction is straight along the axis. It can no longer damage the bolts and tool due to the tilted installation.

Die guides can be used for both left-hand threads and right-hand threads.

How Iron Cutting Guides Are Made?

All guides are injection molded. For this, aluminum is poured into a mold. Chip holes are then punched in the guides to ensure better chip flow when tapping. The inner diameter of the die guide has a well-defined size: it is adapted to the diameter of the bolt on which the thread is cut. As a result, the guide sits precisely and the threads are cut correctly, preventing the die from sliding.!

GSR die guides are suitable for:

Dies according to DIN 2236 = EN 22569 with cutting iron holder DIN 225 = EN 22568 M3-M12

Dies in accordance with the factory standard 25 × 9 mm M3-M12

The ram guide is placed under the ram in the ram holder and secured with fixing screws. After the first turns have been cut. the guide is removed from the die holder and the threading will be finished as usual.

In addition, the following tools are required:

insert the die guide into the die-guide tube downward.

place the die on top of it and secure it with the retaining screws of the holder. For our GSR dies, it doesn’t matter how you insert the dies. they have a double-sided cut, so tapping is possible from both sides.

lubricate the attached bolt with thread cutting paste.

install the die so that the bolt enters the die guide.

with a little pressure on the die, cut 2-3 turns.

turn the ram holder with the ram back and remove it.

loosen the fixing screws, remove the ram, and then remove the guide from the ram holder.

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place the die back in the holder and fix it in it again.

cut the threads to the end.

Step 10: solid threads are cut.

Die cutting

External threading is an operation, without which it is difficult to imagine any production of machines, mechanisms or supporting structures. Riveting and spot (or plane) welding are not always appropriate here, which means that screw or bolted connections are still the way out.

Preparation

To prepare for tapping with a die, a female HSS circular cutter, do a few steps.

  • Saw off and align (if necessary) a rod or a piece of pipe of a certain length.
  • Grind the edge where you want to cut in the first place in a circle. This will facilitate the rotation of the plate, giving it the desired trajectory of movement. Turning is performed at least a millimeter in length. it has an even bevel in the cut. Perfectly smooth turning is performed on a lathe.
  • Clamp a piece of pipe or rod in a locksmith’s vice. Ideally, when the tabletop of the workbench, on which they are fixed, is located at the level (or slightly below the level) of the worker’s belt. Check that the pipe or rod is perpendicular to the ground. according to the laws of physics, this makes it easier to start and control threading.
  • Lubricate the internal thread of the die and the pipe (or rod) itself with engine or transmission oil, oil working.
  • Screw manual ram holders onto the die, or install it in a low-speed machine. The ideal option would be a lathe with an adapter for a circular (machine) ram holder.

After that, put on the die, and begin to rotate it around the workpiece.

Hand threading with a die

Technology

Die-cutting is carried out in a calm environment, in a safe place, where the prerequisites for any accidental jerking actions are excluded. A die not installed parallel to the horizon. provided that the pipe or rod is fixed strictly perpendicularly. will ensure an unsuccessful start of cutting the helical groove around the base to be cut. And although the die will align itself, after passing at least a couple of turns, it is better not to allow this. the first turns will become uneven, and it will be extremely difficult to screw the nut, as well as twist the rod into the massive part prepared for it. The result is a noticeably damaged threaded joint of the workpieces, which does not withstand the maximum weight, bursting and breaking loads, which is declared according to the diameter of the “cut” workpiece, the dimensions of the nuts and the massive part, into which this workpiece is subsequently screwed. If the thread is damaged, then the master will grab it and weld it with welding, without which the task was set to do without even before starting work on creating a threaded joint.

After aligning the die parallel to the ground, rotate it along its own internal thread. A simple die is a tool that comes into contact with the surface of the pipe or rod being cut from four sides along the arcs of a circle, which is the surface of the workpiece on the cross section of the latter. The equidistance of adjacent edges (arcs of this circle) from each other and from the central axis of the pipe / rod (and the tool itself) allows the die to move smoothly, provided that the beginning (the first two turns) are made clearly.

The right-hand thread is twisted clockwise, the left-hand thread is vice versa.

The first turns are performed very carefully. the alignment of the cutting edges along the groove of the first turn is important, which will enable the rest to follow clearly around the one that served as the “most forward” one. Perform the first rotation of the plate at an angle of up to 90-180 degrees. you need to make sure that the process goes according to plan, the plate does not suddenly curl to one side in any direction. If it is curled up and the threading stops, then grind off the damaged edge by turning, and try re-cutting the same thread. Even for beginners who have never held a die in their hands before, threading quickly becomes a simple process.

After completing the first half of the turn, continue carefully, periodically returning the die back, against the course of twisting, move it forward at small angles. The technique is as follows: go, for example, 10 degrees forward. take half of this angular distance (in this case, 5 degrees) back. That is, you need to cut the thread in jerks to prevent overheating of the die and the workpiece. and, as a rule, releasing the hardened high-speed steel from which the cutting tool is made. Periodically remove (screw) the die and add a few drops of machine oil to it, remove metal shavings from the tool grooves, for which a piece of rags is used.

Having cut two turns, you can increase the intensity and amplitude of movements, for example, up to tens of degrees. but do not overdo it: the tool and workpiece should not overheat. If this still happened, take a technological break. both the pipe (rod) and the die should cool.

If you are threading on a lathe, then engage a low gear.

An attempt to turn at a high speed at once can damage both the workpiece and the die, and the gearbox (or motor) of the machine itself. Instead of a wrench, beginners insert a suitable analogue of a machine ram holder into the screwdriver, turn on the lowest speed. but before that they fix the screwdriver, for example, in a vice, or with the help of brackets on a specially made elevation (support) installed on the tabletop of the workbench.

Of course, you can do the opposite. rotate the pipe by clamping it in a lathe (or a rod in a drill / screwdriver), and fix the die in a vice. But such a method will require a serious structure of stops and guides, similar to those used on a milling machine or thickness gauge. Do not create additional difficulties for yourself. this will turn out to be unnecessary costs for you.

Having cut a thread on one workpiece, proceed to the next. On a factory conveyor, where a constant daily standard for workpieces is needed, for example, a thousand rods per day, a machine is used with cooling of the die and other moving mechanisms. Cooling of a tool constantly warming up from friction is carried out, for example, with the help of a technical vacuum cleaner connected to the branch pipe of the working (closed) compartment. You can also design a similar chamber, where, in addition to removing the chips that did not have time to adhere to the oil supplied to the point of operation, the temperature of the working die is also reset, for example, from 100 to 150 degrees, which prolongs its service life. The result is neat, even workpieces, just like from the manufacturer. For example, this is how the end threading for studs from smooth (round) reinforcement occurs.

Useful Tips

Do not neglect the lubrication of the die (die) and the workpiece itself.

Remember to remove sawdust (along the thread) from the pipe (or rod) and die, adding a little more oil after that. Dry cutting will lead to rapid tool wear, which immediately manifests itself as fuzzy threads on new workpieces.

Attempting to place a die on an unsharpened pipe or rod will greatly complicate the smooth and even start of the grooving process. The quality of the thread can be extremely low.

Use dies with a HSS hardness of at least 60 HRC.

Ideally, get a tool from alloy 63: this hardness is inherent in the most expensive cutters. The use of Victory Dies would not be worth it: Victory Alloy processes granite and concrete, not steel. Diamond sputtering on the dies is too expensive, you don’t have to cut hardened rods or pipes. Avoid counterfeits made of low-strength steel with a hardness index below 57: such dies quickly deteriorate.

Do not expose the tool to overheating, incandescence.

Do not use a tapered die to thread a normal workpiece. Such a workpiece is turned on a lathe at the angle of the cone, referring to the drawing. Violation of this rule entails breakage of the die and the workpiece itself. The opposite is also true: cutting a tapered workpiece with a conventional cutter will give uneven turns, since the contact area with it is incomplete.

When cutting threads manually using dies with non-standard threads, movements are made at an even smaller angle, and unscrewing the tool and cleaning, lubricating already made turns and cutting edges. more often. The standard thread pitch for M6 is, for example, a groove width of 1 mm, anything larger or smaller requires a special approach.

Next, see the video on how to cut a thread with a die.