All about coffeeGrinding

Grinding

The whole coffee beans are ground, also known as milling, to facilitate the brewing process.

The fineness of grind strongly affects brewing, and must be matched to the brewing method for best results. Brewing methods which expose coffee grounds to heated water for longer require a coarser grind than faster brewing methods. Beans which are too finely ground for the brewing method in which they are used will expose too much surface area to the heated water and produce a bitter, harsh, "over-extracted" taste. At the other extreme, an overly coarse grind will produce weak coffee. Due to the importance of fineness, uniformly ground coffee is better than a mixture of sizes.

Ground coffee deteriorates faster than roasted beans because of the greater surface area exposed to oxygen. Many coffee drinkers grind the beans themselves immediately before brewing.

There are four methods of grinding coffee for brewing: burr-grinding, chopping, pounding, and roller grinding.