A disc sander is a machine. It consists of a circular sand paper covered wheel being electrically spun around. It is sat between two benches- the one on the front is used to put work on. The one at the back houses the machinery that spins the wheel around. It is used chiefly to sand wooden objects so that they have smoother edges. To use, press the piece of wood up against the spinning disc gently. Turn over and do the same again. Because of the forceful abrasive nature, it is wise to not let your fingers get too close to the spinning disc. Always wait until the disc has completely stopped before touching it.