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For beginners in working with a grinder 100 percent, this thought comes up - after using the disc with a large grinder, can it not throw it away, but put it on a small one and it will still work?
But it’s scary to put a disc from a big to a small grinder yourself, they take doubts, suddenly it’s impossible. The search for an answer begins - they ask more experienced people, ask this question on the Internet and read sites or forums.
For the sake of interest, I myself looked for an answer to it on the Internet, and did not see a specific answer, sites about welding or do not answer vaguely, it is not clear. Or they are categorically not advised to do this, but they do not give iron arguments why it is impossible.
Let's take a look at this simple situation, close this question. I'll show you everything using my instrument as an example.
I have 2 grinders, a large 230 disc and a small 125 disc. I will say right away that a small Bulgarian always without hesitation wears out discs for a large one!
For the 125 grinder, of course, I take the discs separately, but I also cut the remains from the large one on the small one. And there is nothing wrong or dangerous about that. See the evidence!
In the middle of the disc there is such a plate on a red background. On the left it is the permissible maximum disc speed, and on the right is the maximum linear speed.
What is the maximum linear speed of a disk? This means the distance that a disc of this diameter would have traveled if it rolled at these revolutions like a wheel — it’s easier to understand and imagine. This means that in a second it must travel no more than 80 meters, otherwise there will be an exorbitant load and it will simply collapse.
Digress, but I think it will be interesting. Do you know what this speed is, 80 meters per second, if translated into km / h?
And this is 288 km / h, you can imagine a sports bike. And our disc, when it is new, did not really grind off for a grinder of this diameter, it spins close to such a speed! Distracted, let's move on.
Here we put on a small 125 grinder a grinded disc from 230. The revolutions on a small grinder are 11000 revolutions, even if this disc is also conditionally with a diameter of 125 mm. Let's calculate the linear speed.
The first photo is the calculation of the circumference if the disc is 125 mm in diameter. I immediately converted it to meters to make it easier to count further. In the second photo, we will calculate how many revolutions a small grinder makes per second and multiply this value by the circumference of the disk.
We will receive an answer of 73 meters per second, this will be the linear speed of a grinded disc from a large grinder, which we will transfer to a small one. As you can see, we will not violate the maximum permissible speed of 80 meters per second.
The only disadvantage of this method is that the discs are too thick for a small grinder. After all, roughly speaking, on the large 230 we work with a 2 mm thick disc, and on the small 125 with a thickness of 1 mm. And here we put on a small disk 2 mm.
So I don't see any obstacles to not doing this, but let it be an extreme case when small disks run out.