Hello! I decided to show a carbide drill test, which can be purchased at about $ 1. It is popularly known as a “feather” (feather drill) and is intended originally for drilling tiles and tiles. In practice, it is already known that such a drill copes well with stone, concrete, glass.
You can buy on Ali for half a dollar and a déja cheaper - Ali Express .
It also copes well with high alloy steel. For example, drilling a file with a thickness of 5-8 millimeters with such a drill is not a problem.
I decided to give the problem more difficult, to drill a hole in the ball from the bearing, with a diameter of 35 millimeters.
Drill the ball from the bearing
Securely fasten the ball of the bearing in the tees of the drilling machine. We fix a feather drill in the boss.
First, start drilling without lubrication. The drill throws a little from side to side. Strong pressure is not worth it.
After the drilling point is full, add oil and continue drilling. Now you can slightly increase the pressure force. In general, you need to do everything carefully and without rushing.
We periodically raise the pan and add oil to the hole.
We continue to drill the bearing.
Almost reached the end, and shavings sprinkled from below. A little more and the drill will go right through.
The result is a through hole in the ball.
Here is such a simple technology for drilling hard alloys, hardened steel or even tool steel.
Of course, such questions do not often arise in life, but there are still cases.
Especially if you need to drill concrete with reinforcement inside, then I recommend doing this with just such a drill. Since it will drill well both concrete and reinforcement inside it.
The price is quite acceptable in China at least. Sometimes domestic counterparts are criticized, but personally, I always try to take a foreign instrument, so life experience shows that it is necessary to do just that.
See you friends!
See a good example in the video.