When coffee beans are exposed to air they oxidize. Since the coffee ground have a larger surface area than the bean and are not covered in a sheath like the bean, they will oxidize even faster. If you grind your beans at home then they are exposed to air for less time and you get fresher grounds. You can also grind only what you want to use right at that moment.
Grinding can also take more time and patience that buying beans that are already ground. If you choose to take the time to grind your beans than you should choose amongst the best coffee grinders.
The burr, blade, and crusher are the three types of coffee grinders on the market.
The crusher is a device that mashes the beans and is and sort of mortar and pestle style grinder. This gives a granule that is not as even as it could be and this style of grinder is not the best for your kitchen.
A blade grinder actually finely chops your beans with a spinning blade that makes the beans smaller and smaller until they are like a granule. Sometimes the grains can be too big and not the same size.
When the grains are different sizes they can release different amounts of oils and they can also...