When testing an abrasive wheel by tapping the wheel gently with a light, non-metallic instrument you notice that the wheel sounds cracked or damaged. is it ok to still use the abrasive wheel?

Answer

NO, it is not okay to use a cracked or damaged abrasive wheel.

Explanation

While an abrasive wheel might contain fine cracks impossible to see with naked eyes, damaged wheels can explode when in contact with ceramics at high speed. In addition to that, bits of shattering wheel could easily fly to cause an accident when the machine is at high speed. Please reject the wheels that sound hollow and dead when tapped.