Shown how I drill holes in thin sheet metal.
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It is almost impossible to drill a hole in a thin sheet metal with a thickness of several dozen with an ordinary metal drill without special sharpening.
At a minimum, you need to put a backing under the material.
To get a round hole, I do this: I clamp a sheet between two plates - plywood, chipboard, plastic or even metal. Such chipboard is more rigid than plywood, and its surface is stronger and harder.
I squeeze the package with two clamps. Chipboard I have hard lacquered surfaces inside. For convenience, I fix the package in a vice. And I drill as usual. I drill a steel sheet through a chipboard.
Shown how I drill a 0.4mm steel sheet, 0.13mm aluminum foil from a beer can, 3mm foam, 0.3mm plastic, 0.2mm lid.
Even neat holes are obtained.
In foam rubber it is faster and easier, of course, to make a hole with a punch. But there is not always a punch of the required diameter. Finding a drill of the right diameter is easier.
Shows how you can drill holes in thin sheet material with a step drill.
A resistance welding drill can be used. But I don't have such a drill.
Sometimes it is necessary to make a large hole in thin sheet metal. Then you can use a core drill.
I also clamp a sheet of metal between pieces of chipboard and drill.
It makes a nice smooth hole. And such a washer.
But sometimes it is necessary to get a circle without a hole.
Then I do this. Everything is the same at first. But it is necessary to drill so that the central drill does not reach the metal, and the core drill itself sinks as far as possible into the chipboard. To do this, I put marks on the core drill with a marker.
I stop drilling. And remove the center drill.
I continue to drill without it.
You get a smooth hole and a circle without a hole.
There are special drills. But, unfortunately, they are designed for wood processing. They, of course, can drill holes in soft materials, even without clamping between the plates, but it is better to clamp between the plates in this case too.
You can grind a drill of this shape from a conventional metal drill. But it is time consuming and long. And this drill will already be special. If you need to make only one or two holes, then you probably should not re-sharpen the drill for this.
This technique (clamping the sheet between the plates) can be used to make a cut in thin sheet material without deforming it.
It is shown that it turns out smoothly and accurately.
Of course, it is faster and easier to cut with ordinary metal scissors. But at the same time, the metal is deformed.
The more the metal is compressed between the chipboard and the harder and stronger the surface of the chipboard, the smoother and more accurate the holes and circles are.
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