Frank, after seeing a few “exploding wheel” videos during my tenure as a machinist, I would replace it immediately. Granted, it isn’t spinning as fast as a regular grinding wheel but if & when it does come apart, it isn’t going to simply fall off the arbor, it’s going to go flying. Don’t take that risk.
"I am enclosing two tickets to the first night of my new play; bring a
friend...if you have one."
--George Bernard Shaw to Winston Churchill
"Cannot possibly attend first night, will attend second..if there is
--Winston Churchill, in response