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![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik.jpg)
Hello! I decided to show a carbide drill test, which can be purchased at about $ 1. In the people it is known as a "feather" (feather drill) and is intended originally for drilling of a tile and a tile. 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 bowl - Ali Express.
![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik-2.jpg)
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.
![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik-3.jpg)
First, start drilling without lubrication. The drill throws a little from side to side. Strong pressure is not worth it.
![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik-4.jpg)
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.
![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik-5.jpg)
We periodically raise the pan and add oil to the hole.
![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik-6.jpg)
We continue to drill the bearing.
![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik-7.jpg)
Almost reached the end, and shavings sprinkled from below. A little more and the drill will go right through.
![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik-8.jpg)
The result is a through hole in the ball.
![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik-9.jpg)
![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik-10.jpg)
![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik-11.jpg)
Here is such a simple technology for drilling hard alloys, hardened steel or even tool steel.
![](http://img.uaft2404.org/img/sdela-2019/chem-prosverlit-podshipnik-12.jpg)
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!
A good example, see the video.
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