My Brother worked with a guy that decided it would be a good idea to put a 12 inch cut off wheel on his 4" grinder.
He went to the hospital to have blade chunks removed from intestines.
My Brother tried to warn the guy that the 4" spins a lot faster as he ducked around a corner.
He said there were pieces of that blade in every wall except for where the guy blocked the pieces with his stomach.
Get some Kevlar sleeves man.