Friends all welcome. I again at the next exit bride-price. In this time I have to repair the boiler, namely the need to cut out a circle of metal and weld it to the bottom of the boiler. How to cut a perfect circle of metal with the help of the Bulgarian roulette and I'll tell you in this article.
The customer has a sheet metal thickness of 6mm, this sheet with dimensions of 1500 per 800mm, I need to cut a perfect circle diameter of 750mm.
The first thing I marked on this sheet square measuring 750 by 750 mm and spend in this square diagonally in order to find the center of the future of the circle at the intersection of the diagonals.
When collecting tool to travel, do not put up with a punch tool which makes a mark in the form of holes in the place to drill. So I made a grinder several shallow cuts through the center of the intersection of the diagonals to happen to outline the very center.
And this is my modified an old tape measure for this purpose markup circle on the metal. Just took a small grinder and a sharp sharpened tooth on the tip of the measuring tape to the tooth with the markup could be inserted into the small holes in the metal.
We are doing the very layout, holding the tooth in a roulette in a recess in the point of intersection of the diagonals, and the roulette marker housing and a marker We combine so that the marker rod on the side of the marked square marker and he rested on the housing-roulette is so convenient and It obtained accurately.
Now take a grinder and walking the first lap we just go on the disk layout without effort. After having done the first round grinder, I cut so a little clicking on the disk passes in front 3-5 cm and came back, and so on around the circle, small passages back and forth. This circle I cut in 3 passes the entire circumference, apart from the first scoring wheel grinder. That's it, no problems.