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Do not we all remember in detail the curriculum, and there was much needed rukastogo any man! And so today's refresh our memory of one important and interesting feature, with which you can set or check the right angle of any size.
To begin, take a marker and obvedom square, so that we have a clear right angle drawn on the surface.
There is such a figure in geometry, it is called the Egyptian delta. The essence of it is to get the right angle, we need to have his hand between them the ratio of 3: 4: 5, more simply if the parties would have a size of 30: 40: 50 mm, then this triangle will have right angle.
Let's look at the whole thing on a simple illustrative examples.
Postpone at our draw a straight angle sizes 150 mm and 200 mm, respectively, when you combine these marks, the according to the ratio of 3: 4: 5, we should get a third party to 250 mm, we can see that that's how it obtained.
But now without dispense gon, and will use only one roulette, from its ferrous metal scraps from all stuff I'll take 3 proftruby different sizes, and try using a tape measure to set them strictly at right angles.
On these tubes I note dimensions 600, 800 and 1000 mm, these numbers are just ratio of 3: 4: 5
Now combine these marks so that they form a triangle
And now we take the factory and check the angle right angle in this triangle will get
As you can see, the right angle is present, in other words turn out and could not, in ancient times as the guys roamed without a precise tool to do everything right!
This we exposed a right angle, and now let's check it. I wanted to check on his desk-welding jig, because I had cooked strictly with right angles and straight diagonals.
Also delayed for proftrube table size 600 and 800 mm, and then take on the already marked-up segment proftrube 1000 mm from the previous example and apply it to the level of the welding table
As you can see, this time we checked right angle, just having a roulette wheel, and knowing the aspect ratio, the right to obtain a right angle 3: 4: 5
Knowing this simple rule, we can apply it in welding, construction, and where a lot more, which will need to check or set the angles of large dimensions.
If you master the manual arc welding alone, then add the channel to your favorites, so you do not seek, and you will have many useful articles for welding self-taught!