Grinding blades are the grinding mechanism used in some coffee machines with an integrated grinder. Grinding blades grind the coffee by means of rapidly rotating blades that cut the beans into smaller pieces. This type of grinding mechanism is generally faster than grinding stones, but may produce a less consistent result and may be noisier. Grinding knives are often used in cheaper coffee machines and may be suitable for less demanding users who do not require a large variation in grind fineness.