Disc mill is used in food processing technology. Disc mills employ shearing force for fine grinding or shearing and impact forces for coarser grinding. There are several types of disc mill such as single disc mill, double disc mill, and pin & disc mill. The moisture content of the feed can be of importance in milling. The quality of the feed depends upon the moisture content and also the temperature sensitivity of the mill. Disc mill often consists of three pairs of carborundum discs. One disc is rotating and the other is stationary. The discs are pressured together and the feed is forced through them, by centrifugal force to the outside. The high shear destroys a lot of the particles releasing a lot of the fat. Then the feed runs down a chute to the centre of the centre set of disc and then finally onto the third set.
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.