Whole bean coffee not only stays fresher longer than ground coffee, it allows you to custom-grind your craft coffee to get the best results from your preferred brewing method.
Grind is about the relationship between the surface area of a bit of coffee and its volume. Smaller grinds will release more of a coffee’s characteristics more quickly than coarser grinds. A rule of thumb: at a given temperature, the longer the coffee brews, the larger the grounds. An increase in temperature (or pressure), will decrease the required ground size.
There are basically two kinds of grinders: blade grinders and burr grinders. Blade grinders – sometimes also referred to as spice grinders – use spinning blades similar to what you find in a blender. Blade grinders are less expensive than burr grinders. Burr grinders use adjustable grinding platforms to control the size of your grind. Some coffee aficionados also claim that crushing the beans to size produces a better result than the high-speed impact of a blade grinder.