First time using a grinder

Oh My God!!!!!



Never, that's 'NEVER' use a larger disc in a grinder than what the grinder was designed for.

There's huge centrifugal forces involved and accidents with grinders never go well, or heal well either.
And always use the proper guard and safety glasses/earmuffs. You can shut your eyes, but you cannot shut your ears.

I have used angle grinders for decades and following these basic rules have only had one accident where I put a slit in the outside of one right finger knuckle.

If you want to use a big disc, get a 9inch angle grinder, and a 7 inch, and a 5 inch....

Discs and stones are made to work at specific surface speeds, go too fast or too slow and you wear the disc or grinder out.
So use a 9inch disc in a 9 inch grinder untill its a 7 inch disc, then put it in the 7 inch grinder untill its a 5 inch disc.

The grinders motor offsets the gyroscopic forces in the disc too. If you use a disc that's too big, it can take off and bite you.

There's a whole bunch of rules. I posted them in some of my earliest posts when I started.
Where to have the guard and how to hold the grinder and such.