The blast wheel and its parts are the most important components of a Shot Blasting Machine.The wear and tear on these parts is a result of frequent use. As a result, you need to maintain them properly to prolong their life and to prevent damage to the machine. A regular PM program will help you identify when the time to replace them is coming and how long they'll last. You can also check the size of the shot pellets to make sure they're the right size.