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In our everyday welding work most of the compounds of profile pipes accounted for 90 degree angle. Someone cooks just butt at 90 degrees, and many zapilivajut for this proftrubu at 45 degrees to 90 degrees of angle joints were stronger and more aesthetic.
It would seem that everything is simple-otchertil on a square line, and just drank it on the grinder, and you get a great beautiful butt of 90 degrees, but this is unfortunately not the case. Today on the illustrative examples, I'll show you why it is not necessary to use the set square, and how it correctly to make the marks on the proftrube for smooth cutting grinder at 45 degrees.
Proftruby took two pieces of 30 60 mm, we need gash ends 45 degrees to obtain a butt joint at 90 degrees.
We note on a square angle of 45 degrees.
Bulgarian saw off strictly on labels, I left the bowl burrs for purity of the experiment, I'm just one rezom Peel, so burrs are located here so.
After cutting the pipe, we docked tightly and took a square to check the 90 degrees. Nothing has happened, if the pipe stand at 90 degrees, the inner compound gap greatly increase. Why did it happen?
This happened for the simple reason that in the palm gon to 45 degrees is not the 45 degrees, and thus the cut length to get more than it should be really. We'll have to put these 45 degrees by hand!
I took a piece of sheet metal with an equal angle of 90 degrees, and it drew a right-angled triangle with two sides of 60 mm, because we proftruba 60 to 30 mm, and cut at 45 degrees we are doing on the side of 60 mm, so we need to calculate the required length of this cut.
And we compute the length of an isosceles right triangle, which we have drawn on this piece of iron. So, what we need cutting length is 85 mm, and that's when it will be 45 degrees.
For a visual example, I put a square to our draw a triangle, we see that the way it is, if noted on a square angle of 45 degrees, it will not work.
Now we know that the need to cut the length should be 85 mm. Just take the same square, and use it as a ruler, for convenience, I took over the zero mark of 100 mm, and accordingly, the withdrawal of the ruler on the side of the pipe 184 mm. Why is 184 mm rather than 185? I just took into account that the disc after cutting will take the millimeter, and get just the right length.
By the way, bring to 184 mm is necessary focusing on the vertical side of 30 mm, otherwise proftrubah have a small curvature, and it is possible to make a mistake in marking.
Sawing of the markup, and then measures the length of the cut, everything turned out as needed, 85 mm, yes I almost forgot, in the first case, when noted on a square, cut length was 89-90 mm, so everything turned out well, ie nothing happened.
And now, when partitioning manually, everything turned out fine. When setting an angle of 90 degrees, the gap is almost no such joint is quite easy and quick brewing.
Tested even his old squares, and was nowhere to be clear angle of 45 degrees, the cuts were either longer or shorter than 85 mm.
Such inconsistencies when marking angle of 45 degrees, I noticed a very long time, at first thought that the experience is not enough, although looking at the more experienced comrades noticed that they had the same problem. So I had to use the curriculum geometry.
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