Hello to all metal lovers. Sometimes it is required to cut a round hole in the metal. No, not holes that can be drilled with a drill, but a larger diameter.
And how to make such holes in our garage conditions without special equipment? It's simple, we use a grinder or welding. How to do this and at what thicknesses and diameters we'll talk in today's article.
If you have to cut a circle of large diameter, then use a large grinder, if there is one, you can also use a small grinder, but you will have to cut longer.
We simply drive the disc along the markings, we do not immediately fully deepen, but cut in a circle with small indentations. And so, in a few complete passes in a circle, we can easily get the desired circle.
We cut out the smaller diameter with a small grinder. We also drive with a disk according to the marking and in a few circles we will completely get the desired hole.
But this option is easy to use if the thickness of the metal is small, up to about 3-4 mm. But if the metal is thicker than 4 mm, then we use a slightly different method.
We pass the grinder along the markings in a circle several times to go as deep as possible. Then, in the middle of the already marked circle, we cut out a rectangle as convenient for us, and saw straight cuts from the rectangle to the circle.
Then we roll these segments with any available hammer tool, pliers. The segments are easily removed and we get the desired circle in the metal.
Small diameters - less than 70 mm are easy to cut by welding, we mean cutting with an electrode. I will show my way of cutting by welding, so that you get exactly the desired diameter with smooth edges.
For example, we will weld the sleeve into the profile pipe, cut the required diameter on the pipe. Mark with a pencil the diameter of the round sleeve.
We repeat the outline of the pencil with chalk, just circle it, it’s inconvenient to trace it with chalk.
By welding, we make a thin seam focusing on the chalk, a seam around the chalk, trying to guide the electrode from the outer edge of the chalk markings. And now we have an excellent guide and limiter for cutting with an electrode. We cut with an arc of the electrode along the edge of the seam inside.
We cut, if any, small influxes from electric welding, and if everything is done correctly, then such a hole will be even and there will be practically no gaps with the sleeve.
We easily weld the sleeve into the pipe.
Friends, for clarity of this method, watch the video where I showed how to burn straight holes even in the vertical position of the metal.