How to cut pipes. What type of pipe cutter to use
The use of metal pipes is gaining in popularity every year. And this is not surprising, because they are famous for their strength, resistance to external loads and weather conditions. During the creation and installation of, for example, pipelines for special purposes, resort to the use of equipment for cutting pipes of different diameters. The process itself can be performed in absolutely different ways, which we will discuss in this article.
|Chain||Works with concrete, ceramic, cast iron products. Fixes the product firmly with a steel chain;|
|Cutter||Works with material with a diameter of up to 10 cm. Designed for plastic and for metal products. Has several metal disks;|
|Telescopic||Designed for thick-walled pipe products;|
|Roller||Consists of 1-3 rollers and guiding mechanisms. Equipment with one roller cuts products with a diameter of up to 5 cm, with three rollers. up to 10 cm;|
|Ratchet||Small in size, so it works with products of small thicknesses. Consists of a handle and blades;|
|Electric||Powered by electricity, so the technician makes less effort when working with steel products;|
|Pneumatic.||Suitable for large diameters (up to 150 cm). Easily works with dense materials such as cast iron;|
|Guillotine||The knife cuts products with a diameter of up to 3 cm at right angles;|
|Orbital||Includes special bevel cutters.|
How to cut a pipe evenly without angle grinder in a hard-to-reach place
Taking a large washer and putting it on the bolt. Then put on a smaller washer, which should be about the same diameter as the hole in the cutting disc (if you can not find such a washer, you can try to evenly clamp the disc without it).
Then put on the disc from the angle grinder. Then put on a large washer and fix it with a nut.
You get a cutting nozzle for a drill or an electric screwdriver.
We clamp the nozzle in the chuck of the drill and at maximum speed trim the pipe as necessary.
Of course the speed here is small, not as an angle grinder, but still work quite possible. Not only can you use this trick to cut a thin duct pipe, but also a thicker plumbing pipe.
So, be sure to take this method to your notice.
The requirements of the law to the customer and the executor
Since a faulty gas line is source of danger to human life, lawmakers have identified the customer. the initiator of cutting or relocating a gas pipe and the executor. The law has special requirements for the latter. Therefore, it is worth paying special attention to them.
Who should apply?
Before 2005, municipal gas services were responsible for the condition of gas pipes and the equipment connected to them. Later the law transferred it to the owners: management companies began to monitor the internal networks in apartment buildings, and the owners or tenants became responsible for the internal networks.
In private households, this has also become the owners’ responsibility. Therefore, before you shorten the gas pipe in the kitchen, you need to determine the owner.
The figure visualizes the division of responsibility between the MC and the tenants. At the same time, payments for maintenance of in-house equipment are included in the monthly receipts. But for the manipulation of the apartment networks, including the cutting of pipes, tenants pay separately
Confirmation of this rule can be found in Decree 10 of 14.05.2013, edited by the government on October 6, 2017.
According to the general provisions of this regulation, the customer when cutting the pipe in an apartment or private home can be the owner of the square meters or a tenant. In this case, the rent must be formalized.
Who is authorized to do the work?
The government document also clearly defines the executor. This is a specialized organization that performs maintenance and repair of gas equipment under a contract with the owners or the management company. In addition, the company supplying the pipes can also take over the cutting.
The law imposes the following requirements on the executor:
- presence in the staff of certified employees with profile education;
- Availability of production instructions for gas works;
- Make sure that you use testing and measuring equipment.
All tools and equipment used by gas service foremen must be calibrated regularly according to the organization’s approved schedule.
As can be seen from the above list, the requirements for the executor are quite high. Therefore, you should not perform shortening of gas pipes on your own or with the help of unauthorized third parties, who do not have a license.
Methods of cutting metal products at an angle
Normal perpendicular cutting at 90°, with an angle grinder, is done quickly and well, if you do not neglect the advice of experts.
Many people think that if a large tool with a large, powerful blade is used for sawing, it is possible to avoid marking. Specialists do not recommend sawing without marking, because after cutting the parts may not align.
Please note! Before you understand how to evenly cut a pipe with a large angle grinder, it is better to make a few marks, to make sure that the calculations are accurate. After incorrectly sawing a profile or gas pipe, you will have to start working again.
Peculiarities of cutting a cylindrical pipe at 45
Most often making a cut at a 45 degree angle is required when installing heating or plumbing systems. The main difficulty in carrying out the work is that after the alignment of the cut parts of the pipe should turn out a right angle of 90 degrees. To achieve the quality of the cutting process will help a simple way to prepare a homemade mold:
- Prepare a plain white sheet of paper.
- Fold it diagonally.
- The protruding part of the sheet should be cut with scissors, so that when unfolded it turns out a square.
- The resulting triangle should be wrapped around the pipe so that the long side is parallel to the section.
A template made of paper is great for cutting metal pieces in the middle.
The resulting triangle, folded in half, should be divided into two parts. The templates should then be wrapped around the pipe, and secured with tape or duct tape. Templates should be placed so that one edge of the base coincides with the second.
Use scissors to round the top corners of both templates. The resulting two blanks of the desired diameter should be put on the pipe, and mark the place of the cut with a chalk or pencil. The prepared marked part can be safely sawn off.
For tubes of small diameter, which must be cut close to the edge, the method of marking with a container of water is suitable. On a deep container is marked the desired angle of cut, then the end of the tube is placed in the water, and tilted to the marking. Line for trimmer contact with the liquid will become a mark for sawing.
How to mark the place of the cut at a 45 degree angle on a profile pipe
Not everyone knows how to cut a profile pipe under 45 degrees with an angle grinder correctly and qualitatively. Experts advise using an ordinary triangular ruler for marking a profile pipe with a square cross section.
First, on one of the edges you should draw a straight line perpendicular to the side of the pipe. Then you need to turn the workpiece, and on the adjacent edge make the oblique mark. It should run from the edge of the first strip at an angle of 45 degrees.
After that, the product is rotated again, and a perpendicular line for the trimmer is drawn. On the fourth edge will only connect the previously drawn strips diagonally. Now you can cut.
Further information! Many experts believe that the best way to mark a profiled pipe is a tape measure. However, with this tool it is very difficult to perform the work perfectly, the cut can turn out uneven. A school ruler will do the job much better.
The most efficient pipe cutting machines
The best machines for flameless cutting cope with fast and accurate cutting of pipes made of highly flammable materials. They easily and accurately process all kinds of polymers, including those that melt at 180-200 °C.
Our website has a detailed article on how to choose a pipe cutter for plastic pipes,
In the cutting of polymer pipes, pipe cutters designed for cutting this particular material are used. Before you start work, you mark it according to the design solution
Cutting tool is perfectly perpendicular to the pipe. The latest generation of pipe cutters are equipped with a leveling attachment to help you find the right position
Once the exact position is chosen the pipe is cut. The tool is moved in the direction indicated by the manufacturer
If after cutting there are burrs on the cut, they are removed with an abrasive material (emery) similarly to how to remove chips from the end face of metal pipes
For cutting tough but ductile copper, the classical roller models are well suited, both mechanical and electric. This type of tool is also suitable for cutting pipe made of more expensive materials (brass, bronze, etc).)
Steel pipes are cut with gas-powered cutting machines. This is not suitable for cast iron, since it causes significant overheating in the area where the cutting element contacts the pipe body. This negatively affects the basic properties of the metal and creates obstacles to even, precise and high-quality cutting.
For an overview of pipe cutters for steel pipes we also recommend. For more information, follow this link.
For cutting pipe sections from multi-component materials, various variants of the manual guillotine are ideal. They do not damage the thin aluminum reinforcement or crush the pliable polymer base.
Ceramic or concrete pipes are most commonly cut with an angle grinder. These materials do not react to thermal impact, and mechanical guillotine-type devices lead to the coloring of the edge and destroy the integrity of the entire pipe.
In addition to equipment designed exclusively for cutting pipes, other tools are also used for the same purpose, for example, a circular saw, a circular saw, a laser cutter and a band saw.
However, this is relevant only for one-time work. If cutting pipes of different shape, diameter and density is carried out regularly, it is better to get a special narrow profile tool.
Cutting with a gas cutter
The technology involves influencing the material with a directional jet of burning gas. Because of low cost of the equipment, this technique is of interest to those who are interested in the best way to cut metal at home or in small businesses. There are practically no restrictions in terms of the thickness of the workpieces to be cut. However, there are significant disadvantages:
- Low quality of the cut, requiring additional processing of parts.
- Large heat-affected zone, which leads to deformations.
- Higher material consumption.
- The need to carefully observe safety precautions. Only specialists who have been properly trained and know how to properly cut metal with a gas cutter are allowed to work.
All this limits the application of the technique.
Cutting techniques for pipes at an angle
When considering straight or angled cuts, you have to take into account the different materials of the workpieces that are being cut. Thus, it is easier and easier to cut hoses made of polypropylene or thin copper than thick-walled steel pipes.
Plastic products of small diameters are cut at the right angle using special scissors. You can control the angle with a standard protractor. Cutting of polymer pipes is also done with an ordinary hacksaw with a fine-toothed blade.
It is very common to cut into pipes while working with these mounting elements. A popular tool for such cases. the so-called angle grinder. This tool is used for straight and diagonal cutting
The most common installation requirement is to cut water, sewage and ventilation pipes at a 45º angle.
Cutting pipes for the assembly of pipelines is performed if there is no fitting on sale that can solve the problem, or just a shaped final cut is required
Connecting the pipe by cutting the pipe is made if the angle between adjacent spigots is less than 45º. For example, if one collector pipe is connected to three
To make the cut with maximum accuracy make molds. Use them to make a marking of the pipe
CNC machines cut metal pipes at an angle on an industrial scale. Privately cut with an angle grinder, fixing the pipe in a vise, or with an electric saw securing the pipe in a jig
An electric metal jigsaw will be a great help in spatial cutting of metal pipe. However, before the work, it is advisable to “practice” on scraps of waste material
It is easier and simpler to cut profile pipe with an angle grinder. You can fix the profile both in a vice and in a jig
If in the assembly of the pipeline is planned to make one or two cuts at an angle, it is sufficient to use an electric saw with a metal blade
Polymer pipe at an angle can be cut with an ordinary hand saw, but it is very important to fix it in the jigsaw, so as not to spoil the material
Let’s find out what tools you can use to cut at different angles.
A paper template for a pipe
To perform a relatively precise cut, you can use a simple technique, where an ordinary sheet of paper acts as a kind of template. For example, the A4 size printer paper is well suited for creating a template.
Previously, the sheet is marked under the square using a ruler. The size of the diagonal of the square must be equal to the length of the circumference of the tube to be cut. Excess parts of the sheet are trimmed.
The simplest way to get a line of marking on the pipe to make a cut at an angle of 45 degrees. An ordinary sheet of paper is used, which is put on the body of the pipe in the area of the cut
- Fold the sheet diagonally, aligning the opposite corners.
- Rotate the resulting triangle so that the line for the hypotenuse trimmer is perpendicular to the axis of the pipe.
- In this position wrap the paper around the pipe surface, aligning together the extreme points of the hypotenuse.
- Mark the cut with a marker along the line of any of the triangle’s cathetuses.
- Cut the pipe along the marked line.
This method is very convenient for marking and cutting pipe at an angle of 45º in the diameter range from 32 to 63 mm. For more convenience of marking it is recommended to take a thick, but soft paper. You can also use paronite and similar materials.
How to choose the right pipe cutter for plastic pipes and how to use it in practice, described in detail in our proposed article.
Well-made templates for pipe shape cutting allow making cuts with utmost accuracy. In this case, a gap between the prepared blanks is still not excluded. In the connection of metal pipes it is “closed” by a welded seam, when connecting plastic parts, a specialized cord for soldering is used.
The parts cut at an angle from the pipe should be aligned with a minimum gap. So that after welding it can completely fill the seam
If the templates for cutting were made inaccurately, it is easier to cut new elements than to fit them with a file
Before welding shaped cut pieces together, a “fitting” should be performed to identify areas with gaps that require a reinforced weld
We recommend that you try the angled trimmers first with scrap plastic pipe of the appropriate diameter. Once precisely aligned, they can be transferred to the metal workpieces
programs for calculating cutting angles
Milling technology provides different cut angles. But for the formation of a template for angles other than 45º, already need to perform mathematical calculations and the calculated data to cut a template from paper or similar materials.
It is true that there are computer programs designed to save the master from making calculations. The template for cutting pipes such programs print on a printer.
This is how the window of the computer program that performs the calculation of the angle of cut for a tube of circular cross-section looks like. Based on the results of the calculation, a pattern is drawn and printed by the printer. The template is used in the manufacture of templates
Easy calculation program based on MS Excel application helps to calculate and template almost any value of pipe diameter and required cutting angle.
All the user has to do is enter the outside diameter and cut angle into the outside diameter and cut angle fields. According to these parameters it is formed a pattern and it can be printed.
Example of a template obtained by calculations in a popular Excel program. Calculation of the points of curve passing is based on only two parameters. the pipe diameter and the required cutting angleDisadvantage of the program is that it does not take into account the thickness of the template sheet, which leads to slight inaccuracies.
Cut the pipe at an angle of 90 degrees
To mark the cut [water and gas pipes] at right angles, you can use a sheet of A4 paper, wide tape or construction adhesive tape. If you wrap a wide enough material around the pipe so that its edges are exactly aligned when you overlap, you get the perfect line for a trimmer cut. If the tape or tape is firmly glued to the metal, you can go straight to the edge.
It is important to know how to use the grinder correctly, hold it with a certain force and follow the safety rules. This cutting technique is the simplest, but it is also the best method for cutting big-diameter pipes.
I will say right away that if you are going to do plumbing or heating system of polypropylene or metal-plastic, it is better to buy a secateurs at once. It is inexpensive, but greatly facilitates the work.
In all other cases, you can also use improvised means
At right angles
To cut the pipe at a 90-degree angle, before directly cutting, I suggest marking. You won’t need a marker or a pencil, as you might think, but a piece of paper or masking tape. I prefer the latter option, because it sticks to the surface.
How To Cut And Replace Cast Iron Pipe
- Then, focusing on the marking, I glue the adhesive tape. It’s important to do it in such a way that the edges of the paper tape come together with maximum precision. If it succeeds, then you can be sure that the cut will be made correctly.
You may use Pipe Wrap instead of duct tape.
Before cutting, the pipe should be carefully secured.
In order to prevent the cutting disk from being caught during the operation the other end of the pipe should be left hanging and the cut should be made from the top of the pipe.
- After that, it remains to make the cut, using an angle grinder. It is necessary to make sure that the cutting disk passed exactly along the edge of the masking tape that you pasted earlier.
If the pipe has a large diameter, you need to cut the wall itself in separate sections, gradually turning the pipe the right way.
Large diameter pipes are cut in sections.
A slightly different way to deal with cast iron pipe, which if not cut properly can split. In this case, I personally act like this:
- I make a cut all around the diameter of the pipe;
- then take a chisel and tap the cut;
- from such impact the product should burst on the recess made by the disk.
Make an oblique cut
Now I’ll tell you how to cut a pipe at 45 degrees. In this case, too, you can use a line marker.
- I take a square sheet of paper (the side of the square should be equal to the outer diameter of the pipe);
- I fold it diagonally;
- I wrap it around the pipe and fasten it.
Marking the cut line with a piece of paper folded diagonally.
In this case, if you make the cut at an oblique edge of the paper sheet, the end will have an angle of 45 degrees.
How to Cut Plumbing Pipes and Tubing | This Old House
Another simple way to make a marking is to lower the pipe at the desired angle into a bucket of water. In this case, the wet edge will serve as a guide for cutting.
But it’s best not to play the trick, but to use a pair of pruning shears, which are designed for just such cases. structurally, the mentioned by me device looks like an inverted letter U, which opposite slats are cut at a right angle.
The pipe should be put inside the jigsaw and cut at the right angle, placing the blade of the hacksaw in the appropriate slots.