Not every drill is capable of taking hard and especially hardened steel. A special tool is needed here! Few people know that you can drill hardened steel using a bearing, or rather, a ball from its structure. Strictly speaking, we will drill steel with a drill, which is made without much difficulty from the mentioned ball from the bearing. Let's see how this is done.
What you need: self-tapping screw, ball from bearing
To begin with, you will need to pick up such a ball from the bearing, the diameter of which would correspond to the diameter of the drill. The easiest way is to break your worn-out bearing with a hammer, after wrapping it in cloth. We take an ordinary self-tapping screw as the basis for the future drill. It should be long enough for drilling. The cap of the self-tapping screw is pre-ground. He himself should be slightly smaller (in diameter) than the ball.
A small nut is clamped in a vice, on which a ball is placed. It will be a temporary stand. Following this, we carefully put the cap of the self-tapping screw on the ball and weld them into one piece. The protruding ball diameter and welding should be removed with emery. It is important to process the future drill so that no corners remain.
Next, using the same emery, we grind the ball so that a twist drill is obtained from it. If necessary, give it the shape of a feather. When this is done, the new drill will still need to be hardened. After welding, the ball will lose its hardness, which means it will need to be restored. An ordinary gas burner will help in this matter. The metal is brought to an orange color, after which it is immersed in oil for a few seconds.
After hardening, the tip of the drill must be sharpened without fail. In no case should you sharpen the drill before hardening. This can lead to a deterioration in the quality of the working edge. The drill made will do an excellent job with almost any metal.
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