Sander is commonly used woodworking machinery, many people will operate it, but will not repair it, sander in the process of operation, there are often some faults, but these faults should be eliminated in time, but if not handled properly, it may affect production and increase costs. Polishing machines, also known as grinders, are often used as mechanical grinding, polishing and waxing. Sander is the machinery and equipment used to complete the sanding work, involving a wide range of industries and a wide range of categories. The following will detail the use of the sander and how it differs from the polisher.