A disk sander is usually used to smooth materials such as woods and plastics. It is a power tool consisting of sandpaper attached to a rotating disc. It also includes a base and table area right in front of the rotating portion.
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A disc sander is a power tool that comprises of sandpaper attached to a rotating disc used to grind and smooth surfaces of materials being worked with. It is often a very heavy sander, with a base and table area in front of the rotating part.