How to cut straight pipe of any diameter. Three easy ways to accurately mark up

Hello, friends.

The other day I saw enough how one comrade with a grinder at random and obliquely cut the sewer pipes. In his defense, he only said: "and how you mark them exactly, they are round."

I had to mark pipes of different diameters in different ways. At the same time, I used materials at hand, from the usual newspaper to full-size plywood sheets. The variations are very different, but there are only three conceptual methods. I am sure it will be useful to someone. Go.

We measure

The first method is not entirely convenient, but quite accurate. Suitable in cases when you are "in the tundra" and there is nothing at all at hand except a pencil and tape measure. I've used it a couple of times. The diameter of the pipes does not matter.

An important condition is the presence of a flat plane near the cut. This can be a pipe edge, a socket, a slip-on or welded-on sleeve, a seam, or any other concentric circle.

We mark the place of the cut with the risk. We measure the distance from the risks to the flat plane. We rearrange the tape measure along it and make risks in a circle using the specified size. We get a circle from the lines.

Crimp

A widely disseminated method on the Internet. We take a sheet of paper or newspaper. We wrap the pipe so that the edges converge at one point. The edge of the newspaper is the cutting plane. Draw with a pencil or marker - the markup is ready.

I see no restrictions on the diameter of the pipes. The only question is what to take for wrapping. Roll paper (such as facsimile paper) is suitable for marking new large-diameter pipes. For old rusty pipes, we made clamps from steel tape fifteen centimeters wide.

Materials can be different: masking tape, roll sandpaper, foam foam roll, etc. The denser and wider the tape, the more accurate the markings.

Twist

The method I use most often when cutting small diameter pipes.

I put the pipe against the wall, with the free end I rest it against the corner (if necessary, I put something in so that the pipe does not roll away). I touch the pipe at the cut with a pencil or marker. So that my hand does not flinch, I rest it on the wall. I rotate the pipe by the edge, and the pencil outlines a straight cut line.

It may seem that the method is only suitable for small pipes. Once we managed to mark a pipe just over a meter in diameter in this way.

Once they brought to the workshop a pipe three meters long and something about twenty meters in diameter, I don’t remember exactly. They told me to take it off. Frankly speaking, this is a non-standard task for us. But we did it.

After a brainstorming session, they drove to the carpenter and brought in a factory sheet of plywood. On one side, they put it tightly under the pipe (at an angle to the future cutting line). Along the second side, a line was drawn along the floor - this is a perpendicular.

Then everything, as described above, only on a large scale. Two men rolled the pipe, trying to do it as evenly as possible. The third placed a marker on the pipe and guided it along the line marked on the floor. At the end, the markup closed, which means we succeeded. There are no unsolvable tasks. You just need to be smart.

That's all for me. Thanks for reading. If the article was helpful, subscribe to the channel and of course put your thumbs up 👍.