The reasons why the grinding machine's spiral machine produces sparks, its old sound changes, and makes a hoarse and bad sound. I tried to explain in detail how the grinding machine should be disassembled, what parts should be disassembled, what to pay attention to when disassembling and assembling, and I tried to use as slow and understandable a language as possible. I especially focused on the maintenance of grinding machines, coal replacement, and the possibilities of where the malfunction could occur. In short, I have touched on the issues that you can do with the grinding machine at home with your own means. I hope you will find it useful and solve your problems without taking it for repair. I wish you luck. Do not leave your comments on the subject.